64 results about "Single-molecule magnet" patented technology

The invention discloses a method for preparing a single-molecular magnet [Dy2(saph)2(NO3)2(CH3OH)4] and relates to a method for preparing a single-molecular magnet. The invention aims at solving the problems that the synthetic method of the conventional rare earth complex single-molecular magnet is low in yield and the synthetic method of the complex is complicated. The method comprises the following steps: dissolving o-aminophenol salicylaldehyde in acetonitrile, thereby obtaining a solution A; dissolving dysprosium nitrate in methanol, thereby obtaining a solution B; mixing the solution A and the solution B, adding a triethylamine solution into the mixed solution, stirring under room temperature condition, thereby obtaining a preform; and volatilizing a solvent out of the preform, thereby obtaining the complex. The [Dy2(saph)2(NO3)2(CH3OH)4] prepared by the method disclosed by the invention is a single-molecular magnet with good ferromagnetic properties, the yield of the preparation method disclosed by the invention is high and is over 52.84 percent, and the synthetic method of the single-molecular magnet is simple and high in repeatability. The invention belongs to the field of preparation of single-molecular magnets.

The invention discloses a preparation method of a single-molecular magnet [Dy2(saph)2Cl2].4CH3OH and relates to the preparation method of the single-molecular magnet [Dy2(saph)2Cl2].4CH3OH, which is used for solving the problems that an existing synthesis method for a rear-earth cluster compound single-molecular magnet is lower in yield, complex in synthesis method of a coordination compound and incapable of carrying out mass production. The preparation method comprises the following steps: I, dissolving o-aminophenol salicylaldehyde acetal into acetonitrile to obtain liquor A; dissolving dysprosium chloride into methanol to obtain liquor B; mixing the liquor A with the liquor B, adding triethylamine with concentration of 0.001mol/L to obtain mixed liquor; II, stirring the mixed liquor obtained in the step I under the room temperature to obtain a preform; and III, volatilizing the preform in the solvent to obtain the single-molecular magnet [Dy2(saph)2Cl2].4CH3OH. The preparation method disclosed by the invention is simple, and high in yield which reaches over 45.76%. The preparation method disclosed by the invention is applied to the field of preparing the single-molecular magnets.

The invention discloses a mononuclear dysprosium complex and a preparation method and application thereof. The chemical formula of the complex is [Dy(HL)2(CH3OH)Cl3], wherein HL is 2-methyl-5,7-dibromo-8-hydroxyquinoline. The complex belongs to a monoclinic system and P21/n space groups. The preparation method of the mononuclear dysprosium complex includes the steps that DyCl3.6H2O and 2-methyl-5,7-dibromo-8-hydroxyquinoline are taken and dissolved with a mixed solvent, the pH of the obtained solution is adjusted to range from 6.5 to 7.8, the obtained mixed liquid reacts under the heating condition, and then the complex is obtained, wherein the mixed solvent is a composition of methyl alcohol and acetonitrile. The preparation method of the complex is simple, the cost is low, good repeatability is achieved, magnetic properties of the complex are shown as field-induced single-molecular magnet behaviors, and the complex can be used for preparing magnetic materials.

The invention relates to a single molecular magnet and a preparation method of the single molecular magnet, namely to a single molecular magnet Dy2 (salen) 2 (tta) 4 (OAc) 2 and the preparation method of the single molecular magnet. The invention aims to solve the problems that the synthetic yield of rare earth complex single molecular magnet is relatively low, the synthetic method of the complex is complex, the batch production cannot be carried out and the like, which are faced at present. The molecular formula of the single molecular magnet Dy2 (salen) 2 (tta) 4 (OAc) 2 is C84H56Dy2F12N4O16S4, and the crystal system is a triclinic system. The preparation method comprises the following steps: Carrying out heating reflux on a mixed solution C, then cooling to the room temperature, and filtering to obtain a solution D; dispersing a mixed solution E into the solution D in a solution dispersal mode, and standing to obtain the single molecular magnet Dy2 (salen) 2 (tta) 4 (OAc) 2. The method is used for obtaining the single molecular magnet Dy2 (salen) 2 (tta) 4 (OAc) 2.

The invention discloses a preparation method of a single-molecule magnetic body. The preparation method aims at solving the problem that an existing synthetic method is low in productivity, and a synthetic method of coordination compounds is complex. The preparation method comprises the following steps of preparing mixed solution; preparing a prefabricated body; and synthesizing. The preparation method is high in productivity, simple in synthetic method of the single-molecule magnetic body, strong in repeatability and capable of being used for preparing the single-molecule magnetic body.

The invention relates to a unimolecular magnetic body and a preparation method thereof, in particular to a six-nuclear dysprosium cluster cyclic complex unimolecular magnetic body and a preparation method thereof, and aims to solve the problem that a rare earth complex unimolecular magnetic body prepared by using an existing method is complicated in synthesis method, low in controllability and poor in repeatability. The chemical formula of the six-nuclear dysprosium cluster cyclic complex unimolecular magnetic body is [Dy6(H2shi)6(2-pyca)6(2-pyca-)6], and the molecular formula is C114H90Dy6N18O42. The method comprises the steps that salicylhydroxamic acid, picolinic acid and Dy(NO3)3 6H2O are dissolved into a solvent, and a mixed solution is obtained through ultrasonic treatment; the mixedsolution is subjected to heating reflux, pyridine is added, and a preform is obtained; the preform is subjected to solvent evaporation, and the six-nuclear dysprosium cluster cyclic complex unimolecular magnetic body is obtained. By means of the preparation method, the six-nuclear dysprosium cluster cyclic complex unimolecular magnetic body can be obtained.

The invention relates to an arrowhead complex material with solvent molecule-responded magnetic and ferroelectric properties and a preparation method of the arrowhead complex material. The arrowhead complex material is arrowhead (III) complex polymer simultaneously with single-molecular magnet behaviors and ferroelectric properties, has a molecular formula represented by formula (shown in the description) and is a three-dimensional porous structure containing two different coordination environment arrowhead (III) ions. The preparation method comprises the steps of dissolving Dy(NO3)3.6H2O and palmoxiric acid into a solvent, heating to react, filtering, washing to obtain solids, mixing the solids with acetone to react, heating, and drying. The arrowhead complex material has the advantages that the arrowhead complex presents the single-molecular magnet behaviors and has good ferroelectric properties, and meanwhile, the magnetic and ferroelectric properties of the arrowhead complex are can be changed along the change of solvent molecules, so that the arrowhead complex presents the solvent-responded magnetic and ferroelectric properties. The arrowhead complex material has great potential application values in solid devices such as low-temperature high-density storage equipment, nanometer devices, ferroelectric memories, integrated magnetoelectric devices and solvent photoelectromagnetic sensors.

The method includes steps: (1) dissolving Mn(CH3COO)2.4H2O,K2Cr O4 and KMnO4 in acetum fully under room temp, and continuous agitating; (2) Displacing reaction bulb to water bath jar, standing at room temp, coming up by using water bath method; (3) heating up to 318-328 K and keeping it at constant temperature; (4) cooling down to room temp naturally and standing at the state. The invention raises volume of unimolecule (Mn1-xCrx) 12-ac, and quanta storage capacity of crystal greatly, tunneling probability is 1-7.5 times larger than Mnl2-ac molecular magnet.

The invention discloses polyacid dysprosium single-molecular magnets and a preparation method of the polyacid dysprosium single-molecular magnets and belongs to the field of magnetic storage materials. The chemical formula of the single-molecular magnets is [NaDy(DOTA)2 7H2O] [Fe(CN)5NO]2 11H2O, wherein DOTA is 2,2',2'',2'''-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetra) quadrol. The preparation method of the polyacid dysprosium single-molecular magnets includes the following steps that dysprosium nitrate, DOTA and sodium nitroprusside are prepared into a solution according to the molar ratio 1:1:1, the solution is mixed at normal temperature for one hour and then filtered, filtrate stands still at normal temperature, crystals are separated out, and the crystals are the polyacid dysprosium single-molecular magnets. The polyacid dysprosium single-molecular magnets can be applied to new magnetic storage materials. The preparation method of the polyacid dysprosium single-molecular magnets is simple, easy to achieve and low in cost.

The invention discloses a binuclear dysprosium cluster compound taking 2-aldehyde-8-hydroxyquinoline ethanolamine schiff base as a ligand as well as synthesis methods and application thereof. The chemical formula of the binuclear dysprosium cluster compound is [Dy2(C12H11N2O2)2(NO3)4].CH3CN; the cluster compound belongs to a triclinic system and a P-1 space group. The invention provides the two synthesis methods of the binuclear dysprosium cluster compound; the synthesis methods are simple, low in cost and good in repeatability. Research findings prove that the cluster compound has a field-induced single-molecule magnet behavior, thus being used for preparing magnetic materials.

The invention discloses a ten-core dysprosium cluster compound single-molecular magnet and a preparation method thereof. The ten-core dysprosium cluster compound single-molecular magnet has the chemical formula as [Dy10(ovpho)4(NO3)4(CH3O)3(mu4-O)2(mu3-OH)2(mu2-OH)(H2O)4].8H2O. The ten-core dysprosium cluster compound single-molecular magnet is crystallized in an orthorhombic system Pbcn space group and is structurally formed by two edge-shaped {Dy4} tetrahedron elements and two {Dy2} double-core units located on two sides of the tetrahedron elements. The preparation method comprises the stepsof adopting an H4ovpho ligand and Dy(NO3)3.6H2O with the molar ratio being 1:3 as raw materials, adopting methanol and acetonitrile as solvents, adopting triethylamine as an alkaline matter, stirring, carrying out solvothermal reaction, separating, and washing solids. The ten-core dysprosium cluster compound single-molecular magnet provided by the invention is simple in process, low in cost, easyto control chemical components, good in repeatability and high in yield. Meanwhile, the cluster compound size reaches to the nano scale and is the rare high-core nano single-molecular magnet.

The invention discloses a mixed metal ion single-molecular magnet and a synthesis method thereof, belonging to the field of magnetic storage materials. The chemical formula of the single-molecular magnet is D<y>(DMF)4(H2O)3Fe(CN)6.H2O, wherein DMF is N,N-dimethyl formamide. The preparation method comprises the following steps: evenly mixing dysprosium nitrate and a potassium ferricyanide solution, adding a DMF (dimethyl formamide) solution of quinoline-2-formic acid, stirring for one hour at normal temperature, filtering, standing a filtrate at the normal temperature, and separating out crystals, namely the mixed metal ion single-molecular magnet. The mixed metal ion single-molecular magnet can be applied to a novel magnetic storage material; the method is simple, easy to realize and low in cost.

Nanoparticles for use as magnetic resonance imaging contrast agents are described. The nanoparticles are made up of a polymeric support and a manganese-oxo or manganses-iron-oxo cluster having magnetic properties suitable of a contrast agent. The manganese-oxo clusters may be Mn-12 clusters, which have known characteristics of a single molecule magnet. The polymer support may form a core particle which is coated by the clusters, or the clusters may be dispersed within the polymeric agent.

The invention discloses a Co(III)-Co(II) binuclear cobalt single-molecular magnet, a preparation method and application thereof, the chemical formula of the single-molecular magnet is [CoIIICoII(L)(DMAP)3(CH3COO)], wherein H4L is N, N'-bis(5-methylpyrazole-3-formyl)-1, 3-propane diamine, and the structure is as shown in the specification, DMAP is 4-dimethylaminopyridine, and the structure is as shown in the specification. Compared with the prior art, the Co(III)-Co(II) binuclear cobalt single-molecular magnet has the following advantages that: (1) the Co(III)-Co(II) binuclear cobalt single-molecular magnet can show typical slow relaxation behavior under an external magnetic field of 0.1T, has the characteristics of a single-molecular magnet, and can be used as a molecule-based magnetic material in novel high-density information storage equipment (such as an optical disk and a hard disk); and (2) the method is safe and simple in process, high in controllability and good in reproducibility.

The invention discloses a cobalt-based single-molecular magnet synthesizing method. Cobalt salt and 2-hydroxybenzimidazole ligand are adopted with participation of azides ions, and a cobalt-based single-molecular magnet is prepared under the solvothermal system or a microwave reaction condition. It is indicated by experiments that the process is safe and simple, the cost of raw materials is low, the defect that the reproducibility of a common solution method is poor is overcome, the obtained single-molecular magnet of the [Co12(L)15(N3)7](NO3)2.2(CH3OH).2(H2O) (L is the 2-hydroxybenzimidazole ligand ) is red hexagonal-prism-shaped crystal, the purity is high, the crystal size is large and can be controlled within 2*1*1.5 mm, and the yield is high and reaches over 50%.