- Synthesis, structure, and photoluminescent property of a trinuclear Cd II complex based on semi-rigid bis(imidazole-4,5-dicarboxylate) ligand
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A new 3D complex, {[Cd3(HL)2(H2L)(H 2O)4]·2H2O}n (1) (H 4L = 1,1′-(1,4-phenylenebis(methylene))bis(1H-imidazole-4,5- dicarboxylic acid), has been hydrothermally synthesized and characterized by elemental analyses, IR, TG, and X-ray single-crystal diffraction. Complex 1 is the first framework based on CdII ion and semi-rigid bis-IDC ligand. The (6,6)-net architecture of 1 is built from H2L2 - ligands linking 1D chain-like [Cd3(HL)2]n SBUs, which formed by HL3 - anions bridging two kinds of metal centers. In addition, complex 1 was demonstrated to display strong blue-violet fluorescence emission in the solid state at room temperature.
- Yuan, Gang,Shao, Kui-Zhan,Hao, Xiang-Rong,Pan, Ya-Ru,Su, Zhong-Min
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- Preparation method of nitrogen-containing aromatic dicarboxylic acid
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The invention discloses a preparation method of nitrogen-containing aromatic dicarboxylic acid. The method includes: taking quinoline, isoquinoline, benzimidazole or benzotriazole and a derivative thereof as the raw materials, adopting oxone as the oxidant, employing a metal salt as the catalyst and using inorganic acid as the medium, adding a phase transfer reagent, and carrying out reaction to obtain nitrogen-containing aromatic dicarboxylic acid. The reagents used by the method are high in stability, convenient for transportation and storage, the operation is simple, the conditions are easily controllable, and the price is low, at the same time, the catalytic effect is good, the yield is high, and waste liquid treatment is easy, therefore the method is convenient for industrial large-scale production.
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Paragraph 0133-0140; 0149-0160
(2020/03/02)
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- Olmesartan high purity intermediate 2-propyl imidazole -4,5-dicarboxylic acid preparation method and application
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The invention provides a preparation method of 2-propylimidazolyl-4,5-dicarboxylic acid (1). According to the method, the concentration of the sulfuric acid solution, the volume/mass ratio of the sulfuric acid solution to 2-propyl benzimidazole, the volume ratio of the oxydol to the sulfuric acid water solution, reaction time, added water volume and cooling recrystallization temperature are accurately controlled to obviously lower the content of the impurity imidazolyl-4,5-dicarboxylic acid (8), thereby further obtaining the high-purity olmesartan medoxomil. The invention also provides a compound disclosed as Formula 9 and application thereof in olmesartan medoxomil preparation as a control quality standard substance.
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Paragraph 0093-0095
(2017/02/28)
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- CARBOXYIMIDAZOLES IN THE MANNICH REACTION
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Depending on the reagent ratio, 5-dimethylaminomethyl-4-imidazole-4-carboxylic acid ad 2,4,5-tris(dimethylaminomethyl)imidazole were obtained in the aminomethylation of imidazole-4-carboxylic and imidazole-4,5-dicarboxylic acids.The oxidation of these compounds with nitric acid leads to imidazole-4,5-dicarboxylic acid.
- Belyaev, N. A.,Mokrushin, V. S.
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p. 165 - 168
(2007/10/02)
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- Dinuclear Rhodium and Iridium Complexes of Dicarboxyimidazolates; Crystal Structure of *2PriOH
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Dinuclear complexes of rhodium and iridium with 4,5-dicarboxyimidazole (H3dcbi) and 4,5-dicarboxy-2-methylimidazole (H3dcbmi) are reported.In each case, the bridging carboxyimidazole ligand binds as the trianion.The auxiliary ligands are cyclo-octa-1,5-diene (cod), carbon monoxide, and triphenylphosphine.The CO complexes, such as which contains a planar dinuclear anion, exhibit strong colours which are caused by intermolecular stacking interactions and which are modulated by the counter cation.The X-ray crystal structure of iOH is described.
- Bayon, J. Carlos,Net, Gemma,Rasmussen, Paul G.,Kolowich, J. Bruce
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p. 3003 - 3008
(2007/10/02)
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- Preparation of imidazole-4,5-dicarboxylic acid
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Imidazole-4,5-dicarboxylic acid is prepared by a process in which imidazole is reacted with formaldehyde, and the reaction mixture is treated with nitric acid.
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