38 results about "Triazene Compound" patented technology

The invention relates to a bistriazene compound, in particular to 4, 4'-bis[5, 6-dichloro-2-benzothiazolylazo-amino]biphenyl-3, 3'-disulfonic acid and a preparation method and application thereof. The invention solves the problem existing in the prior art that a reagent for detecting heavy metal ions has nonideal sensitivity. The molecular structural formula of the 4, 4'-bis[5, 6-dichloro-2-benzothiazolylazo-amino]biphenyl-3, 3'-disulfonic acid is shown as follows. The 4, 4'-bis[5, 6-dichloro-2-benzothiazolylazo-amino]biphenyl-3, 3'-disulfonic acid is used for the detection of the heavy metal ions, has the advantages of good selectivity, high sensitivity, and steady performance, can be used for fluorescence detection of Ni (II) in alkaline medium in the presence of a triton surfactant, and can also be used as a visualization reagent for photometric analysis.

The invention relates to a bis-heterocyclic triazene compound, and specifically relates to a 2,2'-bis(2-hydroxy-4-sulfonic-1-naphthylamine azoxyl)-5,5'-dimethyl-4,4'-bithiazole and a preparation method thereof. The preparation method comprises the following steps of: (1) preparation of 2,5-dibromohexanedione; (2) preparation of 2,2'-diamino-5,5'-dimethyl-4,4'-bithiazole; (3) preparation of 5,5'-dimethyl-4,4'-bithiazole-2,2'- bis-diazonium salt; (4) preparation of an objective product BHSNAADMBT. The technical scheme of the invention connects bithiazole heterocycle and naphthalene ring derivative with fluorescence property together to synthesize a reagent with double functional-analytical groups and large steric hindrance; and the compound of the invention not only has high reaction sensitivity with metal ions, but also has good selectivity. The reagent is a good photometric analysis developer and a novel fluorescence analytical reagent with high sensitivity and good selectivity as well.

The invention relates to a ditriazene compound, in particular to a method for preparing 2,6-bis-(1,1'-naphthalene amino azo)benzo(1,2-d;4,5-d') dithiazole and application of the 2,6-bis-(1,1'-naphthalene amino azo)benzo(1,2-d;4,5-d') dithiazole. According to the 2,6-bis-(1,1'-naphthalene amino azo)benzo(1,2-d;4,5-d') dithiazole, a molecular structural formula is shown in the specification. The method is characterized in that naphthylamine with a fluorescent characteristic and a 2,6-diamino benzo[1,2-d;4,5-d'] dithiazole heterocyclic ring with an auxochromic capacity are bonded by a triazene structure to synthesize a linear ditriazene reagent with a relative large conjugation degree. The sensitivity and fluorescent characteristic of the reagent are enhanced, and the reagent can be used for the fluorometric analysis of lead ions in an alkaline medium.

The present invention relates to a bis-triazene, in particular to a 3.5-bis-(4-nitrobenzenediazoamino) benzoic acid and the preparation method thereof. The molecular structure is shown by the formula below, the preparation method includes the following procedures that: 1,3-diamino-benzoic acid is dissolved with HCl solution, NaNO2 is taken, dissolved with water, and added into the solution as above for reaction for about 1-2h to obtain a diazo solution, then p-nitroaniline is dissolved with ethanol, the solution is dripped into the former diazo solution for reaction for 1.5h to obtain a henna deposit, which is allowed standing overnight, filtrated to obtain a deposit, which is rinsed with anhydrous ethanol and water, and then dried to obtain the brown solid. The substance provided by the present invention can be adopted as the fluorescence agent for heavy metal ion and the luminosity analytical developer.

The present invention discloses 1, 3-bi (2-benzothiazolyl diazo amino) benzene (BBTAB) as one kind of diherocyclic triazene compound and its preparation process and application. The compound is prepared with m-phenylenediamine and through double diazonation and coupling with 2-amino benzothiazole. Inside alkali medium with beta-CD, the diherocyclic triazene structure of the reagent is compounded with copper ion to raise the rigidity of BBTAB and to strength the fluorescence obviously. Based on water has been said, new fluorescent analysis method of determining Cu (II) with BBTAB is established. Test on different water samples containing copper ion gives satisfactory results. In addition, BBTAB may be also used as developing agent.

The invention discloses a triazene compound, a preparation method, and a method for determination of a cadmium content. A structural formula of the triazene compound is as shown in the specification, wherein the name of the triazene compound is 1-(p-acetylbenzole)-3-(quinaldine)-triazene. The preparation method comprises the steps of diazonium salt synthesis, diazonium salt coupling and product purification. The method for the determination of the cadmium content comprises the steps of sample digestion, cadmium enrichment, complex reaction and absorbance determination. The triazene compound is a new compound synthesized for the first time; for the determination of the cadmium content, solid phase extraction is adopted to enrich cadmium, a lower cadmium content in a sample can be tested, interfering ions are few, and the contrast of absorption positions of a cadmium ion complex and a reagent blank is large, so that the sensitivity of spectrophotometric determination is ensured. The method for the determination of the cadmium content with the triazene compound has the characteristics that a reaction system develops colors rapidly, the system is stable, the use amount of an organic solvent is small, the operation is safer, and the pollution to an environment is small.

The present invention relates to a heterocyclic di-triazene compound, di-(8-quinoline diazoaminoazobenzene)-biphenyl (BQDADB). 8-aminoquinoline is treated through diazotization by sodium nitrite under the acidic conditions and then reacts with benzidine in the alcohol solution; thus the compound can be prepared. The compound can not only be used as an excellent chromogenic agent, but also can be used as a fluorescent reagent with high sensitivity and high selectivity. And the compound can be used for testing the fluorescence of metal ions, in particular testing the Cu(II) in the alkaline medium.

The invention relates to a triazene compound 1-(8-quinoline)-3-(2-pyridyl)-triazene (QPyT) which contains heterocycle. The preparation method of the invention comprises the steps: diazotizing 8-amino quinoline by using sodium nitrate under acidic condition and reacting with 2-aminopyridine in alcoholic solution. The compound is not only a good visualization reagent, but also a fluorescent reagent with high sensitivity and good selectivity, which can be used for fluoroscopic examination of metal ion, in particular for the examination of Pb (II) in alkaline medium.

The invention belongs to the technical field of double triazene compounds and provides 3,3'-dimethylthio-4,4'-bis(2,6-dichloro-4-nitrophenyl diazoamino) biphenyl, a preparation method and an application in order to solve the problems that when an existing triazene reagent is used for detecting heavy metal ions through photometric analysis, interference from coexisting ions is strong, sensitivity and selectivity are not ideal enough and the existing triazene reagent cannot be taken as a fluorescent reagent for fluorescence detection of the heavy metal ions. 3,3'-dimethylthio-4,4'-diaminodiphenyl and 2,6-dichloro-4-nitrophenyl are linked together through a triazene functional group -N=N-NH-, and a prepared reagent is not only a photometric analysis reagent with good sensitivity and selectivity, but also is a fluorescence analysis reagent with a high fluorescence characteristic. The sensitivity of the reagent for measuring mercury with a photometric method is improved; the reagent is a fluorescent lead (II) measurement reagent with good sensitivity and selectivity; the allowed coexistence number of common interfering ions is greatly increased; a synthetic method is simple, conditions are mild, and complexes formed by a solid reagent and a reagent solution with mercury are all stable.

The invention belongs to the field of bistriazene compounds, and solves the problem in the prior art that detection of heavy metal ions by triazene reagents has a low sensitivity and unideal selectivity. The method comprises the following steps: firstly, NaHSO3, formaldehyde and aniline are used for preparing a settled solution of sodium aniline methyl sulfonate, sulfanilic acid is used for preparing a solution of diazonium salt, the two kinds of solution are mixed, and 4-amino-4'-azobenzene sulfonic acid; secondly, 2,6-diamino pyridine, KNO3 solid and fuming nitric acid are used, in order to produce 3,5-dinitro-2,6-diamino pyridine; thirdly, two kinds of substances prepared by the two steps are produced into a solution, after a reaction, produced products are separated by column chromatography, and 3,5-dinitro-2,6-bis(4,4'-sulfonic azobenzene azo amino)pyridine. Pyridine is a high-sensitivity developer for measuring cadmium by a photometric method, and measurement of cadmium is good selectivity.

The invention belongs to the technical field of bis triazene compounds. In the prior art, the reagent for heavy metal ion detection has low sensitivity and the selectivity is not ideal. With the present invention, the problems in the prior art can be solved. According to the present invention, with the diazotization reaction and the coupling reaction, 3,5-dimethylthio-2,4-diaminotoluene and p-aminonitro azobenzene are adopted as the raw materials to synthesize the novel bis triazene reagent, wherein the synthesized bis triazene reagent is the luminosity analysis reagent with characteristics of high sensitivity and good selectivity, and is the fluorescent reagent having the strong fluorescence characteristic.