499-83-2Relevant articles and documents
STUDY OF HYDROLYSIS PROCESSES OF 2,6-DICYANOPYRIDINE
Evstratova, M. I.,Prokopov, A. A.,Ivanova, I. L.,Markova, I. G.,Tubina, I. S.,et al.
, p. 126 - 129 (1985)
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Bis(hydroxylamino)triazines: High Selectivity and Hydrolytic Stability of Hydroxylamine-Based Ligands for Uranyl Compared to Vanadium(V) and Iron(III)
Hadjithoma, Sofia,Papanikolaou, Michael G.,Leontidis, Epameinondas,Kabanos, Themistoklis A.,Keramidas, Anastasios D.
, p. 7631 - 7643 (2018)
The development of ligands with high selectivity and affinity for uranium is critical in the extraction of uranium from human body, radioactive waste, and seawater. A scientific challenge is the improvement of the selectivity of chelators for uranium over other heavy metals, including iron and vanadium. Flat ligands with hard donor atoms that satisfy the geometric and electronic requirements of the UVIO22+ exhibit high selectivity for the uranyl moiety. The bis(hydroxylamino)(triazine) ligand, 2,6-bis[hydroxy(methyl)amino]-4-morpholino-1,3,5-triazine (H2bihyat), a strong binder for hard metal ions (FeIII, TiIV, VV, and MoVI), reacted with [UVIO2(NO3)2(H2O)2]·4H2O in aqueous solution and resulted in the isolation of the complexes [UVIO2(bihyat)(H2O)], [UVIO2(bihyat)2]2-, and {[UVIO2(bihyat)(μ-OH)]}22-. These three species are in equilibrium in aqueous solution, and their abundance varies with the concentration of H2bihyat and the pH. Reaction of H2bihyat with [UVIO2(NO3)2(H2O)2]·4H2O in CH3CN gave the trinuclear complex [UVI3O6(bihyat)2(μ-bihyat)2]2-, which is the major species in organic solvents. The dynamics between the UVIO22+ and the free ligand H2bihyat in aqueous and dimethyl sulfoxide solutions; the metal binding ability of the H2bihyat over pyridine-2,6-dicarboxylic acid (H2dipic) or glutarimidedioxime for UVIO22+, and the selectivity of the H2bihyat to bind UVIO22+ in comparison to VVO43- and FeIII in either UVIO22+/VVO43- or UVIO22+/FeIII solutions were examined by NMR and UV-vis spectroscopies. The results revealed that H2bihyat is a superior ligand for UVIO22+ with high selectivity compared to FeIII and VVO43-, which increases at higher pHs. Thus, this type of ligand might find applications in the extraction of uranium from the sea and its removal from the environment and the human body.
High efficiency co-sensitized solar cell based on luminescent lanthanide complexes with pyridine-2,6-dicarboxylic acid ligands
Wang, Xin,Yang, Yu-Lin,Wang, Ping,Li, Liang,Fan, Rui-Qing,Cao, Wen-Wu,Yang, Bin,Wang, Hui,Liu, Jing-Yao
, p. 10619 - 10625 (2012)
Two lanthanide complexes, Ln(HPDA)3·4EtOH (Ln = Tb, Dy) (H2PDA = pyridine-2,6-dicarboxylic acid, EtOH = ethanol), have been successfully synthesized using hydrothermal or solvothermal methods, and their crystal structures were analyz
Preparation method of 2,6-pyridinedicarboxylic acid
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Paragraph 0043-0047; 0054; 0055, (2019/10/01)
The invention provides a preparation method of 2,6-pyridinedicarboxylic acid. The preparation method comprises the following steps: taking 1,7-pimelic acid or 1,7-pimelic acid diester (I) as a raw material to carry out a halogenation reaction to obtain 2,2,6,6-tetrahalide (II), then carrying out a cyclization reaction with ammonia to prepare a dihydropyridine derivative (III), and carrying out oxidation by an oxidizing agent or carrying out oxidation-hydrolysis to obtain the 2,6-pyridinedicarboxylic acid. According to the method disclosed by the invention, raw materials are cheap and easily available, and the preparation method is simple, is easy to implement, and is safe and environmentally friendly. The amount of wastewater is small, cost is low, the yield and selectivity are high, byproducts are fewer, and the preparation method is suitable for industrial production.
Method for synthesizing 2,6-dipicolinic acid
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Paragraph 0020; 0021, (2017/02/09)
The invention discloses a method for synthesizing 2,6-dipicolinic acid. The method comprises the following steps: under the condition of air isolation, by using anhydrous diethyl ether or THF (tetrahydrofuran) as solvent, reacting 2,6-dichloropyridine used as a raw material with active metal under the action of an initiator to obtain a Grignard reagent; and cooling, then introducing excessive dry carbon dioxide gas, and acidifying to obtain the 2,6-dipicolinic acid. According to the invention, the cheap 2,6-dichloropyridine is used as the raw material, so the cost is low; and the synthesis process route is simple and easy to control, and can easily implement industrial production.