438 results about "Diphenylphosphine" patented technology

The invention discloses a 2-(2-(diphenyl phosphine) phenyl) oxazoline nickel halogenide series complex. Said invention provides the structure formula of said complex and its preparation method. Said invention also provides catalyst composition containing said complex and its application in ethylene oligopolymerization. Said catalyst composition has higher ethylene oligopolymerization activity, and the obtained oligomer takes ethylene dimmer and trimer as main components.

A nitrogen-phosphinonickel match catalyst system is composed of the primary catalyst, [(2-methyl)-(8-diphenylphosphino)] nickel quinolinylhalide, and secondary catalyst, methyl aluminoxyane (MAO). Its advantage are low cost, high activity, high output rate of product (norbornaene) (up to 20-100%), and wide range of adjustable molecular weights (1X10 to the power 5-3X10 to the power 6).

The present invention relates to an improved process for preparing chiral N-substituted N-methyl-3-hydroxy-3-(2-thienyl)-propylamine on an industrial scale using an asymmetric hydrogenation as a key step and optionally a special sequence of subsequent steps, using a catalyst system consisting of rhodium and (2R, 4R)-4-(dicyclohexylphosphino)-2-(diphenyl-phosphino-methyl)-N-methyl-aminocarbonyl-pyrrolidine.

The invention relates to a multiphase Pd catalyst and a preparation method and application thereof, belonging to the technical field of catalyst preparation and application. The expressing formula of the catalyst is FDU-CH2PPh2 / PdL2, wherein L denotes dba, OAc or CI, and Pd denotes loading capacity which is 1.5-1.8 weight percent. The preparation method comprises the steps that FDU ordered mesoporous phenolic resin is used as a carrier, a chloride methylene group is introduced through modifying the benzene ring structure of the carrier, the chloride methylene group reacts with monochloro diphenylphosphine to generate a phosphine which takes the FDU ordered mesoporous phenolic resin as a parent substance and finally Pd catalyst is complexed with the phosphine to obtain the multiphase Pd catalyst. The catalyst is particularly suitable for being used as the catalyst in Heck coupling reaction or Suzuki coupling reaction, the catalytic efficiency is high, the catalyst can be recycled for times, and compared with the catalytic activity of the catalyst used at a first time, the catalytic activity of the catalyst used at a sixth time is basically unchanged.

The invention discloses applications of a chiral polymer catalyst in asymmetric reaction, and belongs to the field of material synthesis and application. The phosphine-containing polymer is obtained via mixed polymerization of vinyl-containing chiral bidentate phosphine ligand BINAP (2,2'-bis(diphenylphosphino)-1,1'-binaphthyl) and derivative of vinyl-containing chiral bidentate phosphine ligand BINAP (2,2'-bis(diphenylphosphino)-1,1'-binaphthyl) with other vinyl comonomers. The vinyl polymer possesses relatively large specific surface area and porosity, and excellent thermal stability and chemical stability. In the heterogeneous catalyst, one or a plurality of elements selected from Ru, Rh, Ir, Pa, Au, and Cu are taken as active ingredients. The chiral ligand is uniformly embedded into and highly dispersed in a polymer skeleton, so that metal dispersion degree on the catalyst is relatively high, and relatively high catalytic activity is achieved. The heterogeneous catalyst is suitable for a plurality of reaction technology including intermittent still reaction, continuous fixed bed reaction, and trickle bed reaction. When the heterogeneous catalyst is used in catalytic kettle-type asymmetric hydrogenation, high target product yield is achieved, and enantioselectivity is higher than 96%.

The invention relates to a dinuclear copper [1] complex luminescent material containing pyridine pyrazole chelating ligand and a preparation method thereof. By the application of the functional pyridine pyrazole two-tooth chelating ligand (3-[2-pyridyl] pyrazole [pypzH for short] or 5-tertiary butyl-3-[2-pyridyl] pyrazole [pybpzH for short] or 5-trifluoromethyl-3-[2-pyridyl] pyrazole [pyfpzH for short] and organic double phosphine auxiliary ligand (1,4-double[diphenylphosphine] butane [dppb for short]), a kind of pyridine pyrazole dinuclear copper [1] complex luminescent material [Cu2[pypzH]2[u-dppb]2][ClO4]2,[Cu2 [pybpzH]2[u-dppb]2][ClO4]2 and [Cu2[pyfpzH]2[u-dppb]2][ClO4]2 is prepared. The solid state luminescence property of the luminescent material can be regulated and controlled through the change of the substituent group on the pyridine and pyrazole ring, the maximum values of the solid state luminescence wave length of the luminescent material are 500 nm, 505 nm and 494 nm, the solid state luminescence life of the luminescent material is 48 us, 19 us and 36 us, and the solid state luminescence quantum efficiency of the luminescent material is 74%, 6% and 85%.

The present invention relates to an improved process for preparing L-phenylephrine hydrochloride 3 on an industrial scale by asymmetric hydrogenation as the key step and a special sequence of subsequent steps, using [Rh(COD)Cl]2 as catalyst and a chiral, two-pronged phosphine ligand such as (2R,4R)-4-(dicyclohexylphosphino)-2-(diphenylphosphino-methyl)-N-methyl-aminocarbonyl-pyrrolidine as the catalyst system.

The invention discloses a ruthenium complex catalyzer for acetylene hydrochlorinate and a preparation method and application thereof. The catalyzer is characterized in that active carbon serves as catalyst support, and is loaded with ruthenium chloride and an organic ligand; the molar ratio of the ruthenium chloride and organic ligand is 1:1-6, and ruthenium accounts for 0.1-5.0% of the total weight of the catalyzer; the organic ligand is one or more of triphenylphosphine, pyridine, 2,2'-dipyridyl, acetylacetone, chlorodiphenylphosphine, chlorobenzene, cyclopentadiene, 4-methyl isopropyl benzene and 1,5-cyclooctadiene. The ruthenium complex catalyzer for the acetylene hydrochlorinate and the preparation method and application thereof have the advantages that the preparation process is simple, the catalytic activity and stability of the catalyzer are greatly improved, the catalyzer is more environmentally friendly, and the economy is high.

The invention provides an asymmetric thermal-excitation delayed fluorescence diphenyl ether aromatic phosphine oxide material and a synthetic method and application thereof and aims at solving the technical problem that the thermal-excitation delayed fluorescence diphenyl ether aromatic phosphine oxide material is large in polarity, is easily quenched and is strong in intermolecular effect. The asymmetric thermal-excitation delayed fluorescence diphenyl ether aromatic phosphine oxide material is formed by introducing 2, 3 or 4 diphenylphosphine oxygen groups to 2, 2', 4 and 4' positions of diphenyl ether. The synthetic method comprises the steps of mixing bromo-diphenyl phosphine oxide phenylate, diphenylphosphine, anhydrous sodium acetate, palladium acetate and DMF, pouring a mixture into icy water to perform extraction, obtaining an organic layer for oxidation and performing extraction, drying and purification. The asymmetric thermal-excitation delayed fluorescence diphenyl ether aromatic phosphine oxide material can effectively inhibit mutual intermolecular effect and accordingly inhibit quenching effect. The asymmetric thermal-excitation delayed fluorescence diphenyl ether aromatic phosphine oxide material serves as a light-emitting layer and used for preparing electro-phosphorescence devices.

The invention provides a method of synthesizing methyl acetate through acetylene carbonylation.The method includes: using acetylene, methanol and carbon monoxide as reaction raw materials; under conditions with reaction temperature of 30-80 DEG C and initial pressure of 1,2-6.5 MPa, adopting a palladium-based catalyst immobilized by organic ligand polymer to catalyze acetylene carbonylation to synthesize methyl acetate.2-pyridyldiphenylphosphine (2-PyPPh2) is adopted as an organic ligand and grafted with vinyl to prepare vinyl2-pyridyldiphenylphosphine, cross-linking polymerization is performed under certain conditions to form solid organic ligand polymer (N-PPOL), and the organic ligand polymer is complexed and immobilized with palladium acetate to prepare the palladium-based catalyst immobilized by the organic ligand polymer.Methyl acetate is synthesized through acetylene carbonylation in one step and has high activity, high selectivity and high easiness in separation and recycling.

The invention relates to a macroporous resin catalyst for preparing alkyl carbonate, which mainly solves the problem of the prior art that the activity of the catalyst is low and is quickly reduced. Aiming at well solving the problem, the macroporous resin catalyst adopts the technical scheme that the macroporous resin catalyst is prepared by the following components in percentage by weight: (a) 10% to 20% of metal salts, and (b) 80% to 90% of diphenylphophine substituted composite microspheres. A method for preparing the diphenylphophine substituted composite microspheres comprises the following steps of (1) preparing an additive 1 into a water solution A; (2) preparing a monomer, a comonomer, a nano material, an initiator and an additive 2 into a solution B, wherein at least one of methyl methacrylate, butyl acrylate, styrene, alpha-methylstyrene, 4-butylstyrene or acrylonitrile is adopted as the monomer; (3) mixing the solution B and the solution A to obtain the microspheres; (4) adding a chloromethylation agent or zinc chloride into the microspheres to obtain composite chloride spheres; and (5) adding chlorinated diphenylphosphine and lithium metal into the composite chloride spheres to react, so as to obtain the diphenylphophine substituted composite microspheres. The macroporous resin catalyst can be used for the industrial production of the alkyl carbonate.

The invention discloses a new method for preparing a biphenyl diphosphine ligand 2,2'-diphenylphosphinomethyl-1,1'-biphenyl (BISBI) and derivatives thereof. The method is characterized by comprising the following steps: (1) under the protection of inert gases, adding 40-60 parts of triphenylphosphine and 250-360 parts of ether solvents to a reaction flask, stirring the mixture to dissolve the mixture and adding 3-20 parts of alkali metals and 0-5 parts of electron-rich aromatics to the reaction flask to react for 2-24 hours at 20-120 DEG C to prepare a diphenulphosphine metal compound and a phenyl metal compound; (2) dropwise adding 15-20 parts of tertiary butyl chloride to the reaction solution to remove the generated phenyl metal compound; and (3) dropwise adding the solution formed by 15-40 parts of 2,2'-disubstituted methyl-1,1'-biaryl compound and 20-40 parts of ether solvent to the reaction solution with phenyl metal compound removed to react for 6-24 hours at 0-40 DEG C and carrying out extraction, drying, concentration and recrystallization to obtain the diphosphine ligand 2,2'-diphenylphosphinomethyl-1,1'-biphenyl (BISBI) and the derivatives thereof. The method has the characteristics of cheap and easily obtained raw materials and mild reaction conditions, is simple and convenient for operation, and is easy to realize industrial production.

The invention relates to a method of applying a phosphorus containing small molecule / montmorillonite nano-composite flame retardant to epoxy resin to improve the flame retardance of the epoxy resin, and belongs to the technical field of flame retardance. The small molecule / montmorillonite nano-composite flame retardant is added into the epoxy resin, solidification is performed, and the flame-retardance epoxy resin composite is obtained. The phosphorus containing small molecule comprises one or more of diphenylphosphine, diphenylphosphine oxide, triphenylphosphine, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and 1-oxygroup phosphonia-4-hydroxymethyl-2,6,7-trioxa bicyclo-[2.2.2] octane (PEPA). According to the obtained epoxy resin composite, the interlayer spacing is enlarged due to the fact that phosphorus containing small molecules enter montmorillonite layers, the epoxy resin can react with the phosphorus containing small molecules to enable a chain segment of a polymer to enter the montmorillonite layers, the montmorillonite layers can be peeled and dispersed more easily, and the polymer has the good flame retardance.

The invention discloses novel environmentally friendly phosphorus based flame retardant 2-(diphenylphosphine acyl)-1,4-benzenediol and a preparation method thereof. The flame retardant is reasonable in raw material price, less in additive amount and environmentally friendly and simple in preparation technology, and facilitates industrial production. A halogen-free flame retardant monocomponent epoxy resin composite containing the novel environmentally friendly phosphorus based flame retardant can be stored under room temperature, and is superior in flame retardant property after solidification; when the phosphorus content achieves 1.8%, the solidification flame retardant rating can achieve UL94 V-0; however, the DOPO flame retardant can achieve the same effect only when the phosphorus content thereof achieves 2.1%. The additive amount of the flame retardant is low, the cost is low, and the good mechanical property of the halogen-free flame retardant epoxy resin cured substance can be retained better.

An improved process for preparing adrenaline, or an addition salt thereof, on an industrial scale, with asymmetric hydrogenation as a key step and a special sequence of successive steps, using [Rh(COD)Cl]2 as catalyst and a chiral, bidentate phosphine ligand such as (2R,4R)-4-(dicyclohexylphosphino)-2-(diphenylphosphinomethyl)-N-methylaminocarbonylpyrrolidine as the catalyst system.

The invention relates to a method for preparing L-carnitine by asymmetric catalytic hydrogenation reduction. Alkyl 4-chloroacetoacetate is used as a raw material, [RuCl(cymene)(S-BINAP)]Cl[chloro[(S)-(-)-2,2'-di(diphenylphosphine)-1,1'-binaphthyl](p-cymene)ruthenium chloride(II))] is used as a catalyst, and amination and hydrolysis reaction are carried out to obtain the L-carnitine product. The amination reaction does not need any solvent or virulent cyanide. The chemical purity of the L-carnitine product is higher than 97%, and the specific rotation [alpha]20D is -29 -32. The invention has the advantages of high reaction speed, stable catalytic system, low pressure required by the reaction process, high conversion rate, no need of solvent in the amination reaction, and is convenient to operate, thereby lowering the cost, reducing the environmental pollution and being convenient for large-scale production.

The invention belongs to the field of medicine synthesis and specifically relates to a preparation method of an anidulafungin side chain intermediate 4'-orthopentyloxy-1,1':4',1'-terphenyl-4-carboxylic acid. The preparation method comprises the following steps: initiating a 1,4-dibromo-benzene material which serves as a starting material to carry out Grignard reagent reaction with magnesium by iodine; then, preparing 1,4-benzene hypoboric acid by virtue of addition and hydrolysis with trimethyl borate; and preparing 4'-orthopentyloxy-1,1':4',1'- terphenyl-ethyl carboxylate by virtue of Suzuki reaction of 1,4-benzene hypoboric acid, 4-pentyloxy bromobenzene and 4-halogenated ethyl benzoate in dioxane-ethanol liquor under catalysis of [1,1'-bis(diphenyl phosphino) ferrocene] palladium dichloride, and then, hydrolyzing to obtain a target product. The preparation method disclosed by the invention can lower process cost, is simple, convenient, safe and reliable to operate, and suitable for industrial production.

The invention provides a triphenylphosphine oxide modified triazine compound as well as preparation and an application thereof in an OLED (organic light-emitting device), relates to an organic electroluminescent material, a synthetic method and an apparition of the material, and aims to solve the problem that turn-on voltage is high when the conventional electron transport material with higher triplet-state energy level is applied to a triazine derivative electroluminescent device. The structural formula of the triphenylphosphine oxide modified triazine compound is shown in the specification. A preparation method comprises the following steps: step 1, preparing monobromo triphenyl triazine; and step 2, reacting monobromo triphenyl triazine with diphenylphosphine to prepare the triphenylphosphine oxide modified triazine compound. The triphenylphosphine oxide modified triazine compound can be taken as the electron transport material to be applied to an organic electrophosphorescent device, the turn-on voltage of an electrophosphorescent device is reduced to 2.7 V, and meanwhile, the luminous efficiency and brightness of the organic electroluminescent material and the device of the material are improved.

The invention relates to an o-methyl pyridine tetrazolium tetranuclear copper [I] complex simulating response luminescent photochromic material which is characterized by being perchlorate.bi[5-[6-methyl-2-pyridyl] tetrazole]. tetra [bi[diphenylphosphine]methane] tetra copper [I] complex. The molecular formula thereof is C114H100Cl2Cu4N10O8P8. The invention also provides two methods for preparing the o-methyl pyridine tetrazolium tetranuclear copper [I] complex simulating response luminescent photochromic material which belongs to a new simulating response luminescent photochromic material andhas a wide application prospect.

A catalyst for olefin oligomerization and polymerization and a preparation method thereof relate to a catalyst. Hydrochloride is formed by reacting phosphonic base guanidine ligands with amine chloride and adjacent-diphenyl phosphonic base aniline of different nitrogen substituent in the atmosphere of nitrogen according to molar ratio of 1:1 in an organic solvent at the temperature of 20-150 DEG C within 5-100 hours; further neutraling the hydrochloride through alkali, and enabling the total yield to be larger than 60%. The catalyst is combined with an assistant catalyst with Lewis acidity or with both the Lewis acidity and alkyl exchange performance to form a catalyst system capable of catalyzing ethylene to polymerize or to both polymerize and oligomerize. The polymerization activity can be as high as 2.51*106g mol-1 (metal) -1. The selectivity of alpha- olefin C6-12 in an oligomer is 45.0%-60.6%. The molecular weight of a molymerizer is widely distributed (4.5-120.50), and the catalyst is suitable for industrial processing.

The invention discloses an organic high temperature thermal conductive liquid. The organic high temperature thermal conductive liquid is prepared via segmented heating, stirring, and mixing of propylene glycol, triethanolamine, hexamethylphosphorous triamide, 3-(diphenylphosphino)propylamine, benzotriazole, poly(methacrylic acid), and polymaleic anhydride with a polymerization degree of 6000 at an environment free of oxygen. Corrosion inhibition and anti-scaling properties of the organic high temperature thermal conductive liquid are excellent, reserve alkalinity is higher than 20ml, heat-conducting medium long effectiveness is guaranteed; heat conductivity coefficient is slightly higher than that of thermal conductive oil; and the organic high temperature thermal conductive liquid can be used for replacing thermal conductive oil completely at a temperature ranging from -50 to 190 DEG C. Performance of the organic high temperature thermal conductive liquid is stable at high temperature; application environmental conditions are wide; the corrosion inhibition and anti-scaling properties last long; the organic high temperature thermal conductive liquid is friendly to the environment, and is high in heat conductivity coefficient; the raw materials are easily and directly available, and are cheap; equipment requirements are few; and large scale industrialized production is convenient to realize.

The invention provides a tetranuclear silver exotic metal cluster compound. A chemical molecular formula of the tetranuclear silver exotic metal cluster compound is [(dppf) 2Ag4 (C=CtBu) 2 (CH3OH)2] (BF4) 2.2CH3OH. The invention further provides a method for preparing the tetranuclear silver exotic metal cluster compound. The tetranuclear silver exotic metal cluster compound and the method have the advantages that the method for preparing the tetranuclear silver exotic metal cluster compound is based on the excellent stability of 1, 1'-bis (diphenylphosphine) ferrocene ligands and strong coordinating capacity of silver and phosphorus atoms, and accordingly ultimate products are high in stability and can be possibly potentially applied to the photoelectric field; raw materials for the tetranuclear silver exotic metal cluster compound prepared by the aid of the method are simple and are easily available, the method can be easily and feasibly implemented and is low in cost, good in repeatability and high in yield, processes are simple, the products are stable, certain bases can be provided for constructing exotic metal cluster compounds and chemically modifying silver cluster compounds by preparation of the tetranuclear silver exotic metal cluster compound, and the like.

The invention provides a novel method for synthesizing acrylic acid from acetylene carbonyl. The method comprises the steps of taking acetylene, carbon monoxide and water as raw materials, catalyzing and synthesizing acrylic acid at a reaction temperature between 150 and 250 DEG C under the pressure between 5 and 10 MPa, wherein an adopted catalyst takes nickel carboxylate and copper halide as main catalysts, and the ratio of n(Ni<2+>) to n(Cu<2+>) is between 2:1 and 5:1; methanesulfonic acid is taken as an additive, and the adding amount of the methanesulfonic acid is that the ratio of n(Ni<2+>) to n(CH3SO2OH) is between 1:1 and 3:1; and organic phosphine such as triphenyl phosphine, diphenyl alkyl phosphine, 2-pyridyl diphenyl phosphine are taken as ligands. The catalyst has the advantages of high activity, good selectivity, low corrosiveness and strong carbon deposition resistance in particular.

The invention relates to a reactive type hydrogen peroxide fluorescent probe compound and preparation and application thereof. The hydrogen peroxide fluorescent probe compound has the structure as shown in a formula I. The preparation method comprises the steps that 4-diethylaminosalicylaldehyde and 4-bromobenzyl bromide are dissolved in acetone, anhydrous potassium carbonate is taken as a catalyst, a refluxing reaction is conducted under the protection of nitrogen, and a product II is obtained; the product II and bis(pinacolato)diboron react under the protection of nitrogen by taking [1,1.-bis(diphenylphosphino)ferrocene]dichloropalladium as a catalyst, and a product III is obtained; the product III and malononitrile are subjected to stirring at room temperature by taking piperidine as a catalyst, and the final product probe I is obtained. The probe compound has good selectivity and sensitivity to hydrogen peroxide, is low in detection limit and free of toxicity to cells and can be applied to detection and imaging of hydrogen peroxide in the cells.

The invention discloses a method for efficiently and recyclably synthesizing 2,4,6-trimethylbenzoyldiphenyl phosphine oxide. The method comprises the following steps of a, selecting a vanadium source and a molecular sieve as reaction raw materials to prepare a vanadium molecular sieve catalyst; b, adding 2,4,6-trimethylbenzaldehyde and diphenyl phosphine oxide into a three-opening bottle in which dichloromethane is contained, and stirring at normal temperature to react for 6 hours; c, cooling the three-opening bottle in a low-temperature water bath to 8 to 10 DEG C, sequentially adding the vanadium molecular sieve catalyst and tert-butyl hydroperoxide into the three-opening bottle, stirring to react for 0.5 hour, and continuously stirring at normal temperature for 3 to 5 hours to obtain reaction liquid; and d, filtering the reaction liquid, recycling a vanadium molecular sieve, treating the obtained filtrate by aqueous solution of sodium thiosulfate to remove unreacted oxide, and performing post treatment to obtain a TPO (2,4,6-trimethylbenzoyldiphenyl phosphine oxide) product. As the vanadium molecular sieve serves as the catalyst and is matched with the tert-butyl hydroperoxide to prepare the TPO, the yield of the target product is increased, and the catalyst is environment friendly and recyclable.

The invention discloses an electrolyte for improving high temperature and high voltage performance of a lithium ion battery and application thereof in the lithium ion battery. The electrolyte comprises lithium salt, organic solvent and additive, wherein the additive is composed of methoxyl diphenylphosphine and cathode surface film-forming additive, content of the methoxyl diphenylphosphine in the electrolyte is 0.01-10.0wt.%, and content of the cathode surface film-forming additive in the electrolyte is 0.02-5wt.%; the organic solvent is composed of 10-50wt.% of cyclic carbonate and 30-70wt.% of linear carbonate; and concentration of the lithium salt in the electrolyte is 0.5-2.5mol / L. According to the electrolyte provided by the invention, MDP and cathode surface film-forming additive are used simultaneously as combined additive, stability of a positive electrode material of the lithium ion battery under high voltage can be improved, decomposition of the electrolyte on surface of the positive electrode is inhibited, and cycle performance of the high-voltage lithium ion battery under normal temperature and high temperature is improved.

The invention discloses a di-nuclear cuprous complex green luminescent material and a preparation method thereof. The green luminescent complex provided by the invention is prepared by complexing cuprous iodide and a ligand, and the molecular structure of the complex is [CuI(DPPB)]2, wherein the DPPB in the formula is an electro-neutral 1,4-di(diphenylphosphine) butane containing a ligand P, and iodide ions of a bridging ligand are connected with the centers of two metal ions to form a di-nuclear structural molecule. The complex not only has the advantages that small molecules are easy to purify and the luminous efficiency is high but also has high thermal stability. The material is prepared through a direct mixing reaction between the cuprous iodide and a dichloromethane solution of the ligand, and has the advantages of simple and convenient process, simple equipment, easily-obtainable raw materials, low cost and the like. The material can be used as a green photo-luminescent material or used as a green luminescent layer material in an electroluminescent device consisting of a plurality of layers of organic materials.

The invention relates to the technical field of preparation of catalysts, particularly to an organic porous polymer palladium-supported catalyst and preparation and application methods thereof. The organic porous polymer palladium-supported catalyst containing dichloro[9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene]palladium functional units is prepared by taking dichloro[9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene]palladium and 1, 3, 5-triphenylbenzene as copolymerizing monomers and through a one-step outer crosslinking method. The organic porous polymer palladium-supported catalyst canachieve efficient catalytic carbonylation of brominated aromatic hydrocarbons to synthesize aromatic carbonyl compounds, and meanwhile, is large in specific surface area, wide in pore size distribution range, mild in reaction conditions, high in yield and good in recycling performance, thereby achieving high application potential.

There is disclosed herein phosphorescent compounds, uses thereof, and devices including organic light emitting diode (OLEDs) including such compounds. Compounds of interest include: wherein A is Os or Ru The anionic chelating chromophores N{circumflex over ( )}N, which are formed by connecting one pentagonal ring structure containing at least two nitrogen atoms to a hexagonal pyridine type of fragment via a direct carbon-carbon linkage. L is a neutral donor ligand; the typical example includes carbonyl, pyridine, phosphine, arsine and isocyanide; two neutral L's can also combine to produce the so-called chelating ligand such as 2,2′-bipyridine, 1,10-phenanthroline and N-heterocyclic carbene (NHC) ligand, or bidentate phosphorous ligands such as 1,2-bis(diphenylphosphino)ethane, 1,2-bis(diphenylphosphino)benzene. L can occupy either cis or trans orientation. When L occupies the trans position, the preferred structure contains both the hexagonal fragment of NAN as well as its pentagonal fragment located at the trans position respect to their counterparts of the second NAN chromophore. When L occupies the cis position, the preferred structure consists of the pentagonal unit of N{circumflex over ( )}N chromophores residing opposite to the L. X1, X2 and X3 independently are C or N; when X2 is N, R, is omitted, when X3 is N, R2 is omitted, R1 is H, C1-C8 alkyl, C1-C8 substituted phenyl or C1-C4 perfluoroalkyl, R2 is H, F or cyano substituent, X4 is either C or N; X4 may locate at any position of the hexagonal ring, when X4 is N and R3 and R4 are not linked to X4, R3 is H, methyl or C1-C3 small alkyl, R4 is H, methyl or C1-C3 small alkyl, or R3 and R4 together form an additional conjugated unit with structure