Journal ArticleDOI
Synthesis and kinetic studies in aqueous solution on chromium(III) complexes with isocinchomeronic acid—potential new biochromium sources
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In this paper, the chromium(III) complexes with a new potential chromium transporting ligand, i.e., 2,5-pyridinedicarboxylic acid (isocinchomeronic acid, icaH2), have been obtained and characterized in solution.Abstract:
The chromium(III) complexes with a new potential chromium transporting ligand—2,5-pyridinedicarboxylic acid (isocinchomeronic acid, icaH2):[Cr(icaH)3]0, [Cr(icaH)2 (H2O)2]+ and [Cr(icaH)(H2O)4]2+ (where icaH = N,O-bonded isocinchomeronic acid anion), have been obtained and characterized in solution. The [Cr(icaH)3]0 complex undergoes aquation in acidic media to the diaqua-product. Kinetics of this process was studied spectrophotometrically in the 0.1–1.0 M HClO4 range, at I = 1.0 M. The first aquation stage, the chelate-ring opening at the Cr–N bond, is a much faster than the second one. The rate laws are of the form: k
obs = k
1 + k
−1/Q
1[H+] and k
obs = k
2
Q
2[H+]/(1 + Q
2[H+]), where k
1 and k
2 are the rate constants for the chelate-ring opening and the ligand liberation, respectively, k
−1 is the rate constant of the chelate-ring closure, Q
1 and Q
2 are the protonation constants of the pyridine nitrogen and 5-carboxylate group in the one-end bonded intermediate, respectively. The results are discussed in terms of potential pharmaceutical application of the complex.read more
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Supramolecular cobalt(II)-pyridine-2,5-dicarboxylate complexes with isonicotinamide, 2-amino-3-methylpyridine and 2-amino-6-methylpyridine: Syntheses, crystal structures, spectroscopic, thermal and antimicrobial activity studies
TL;DR: In this article, the thermal behavior of the CoN2O4 distorted octahedral geometry was studied by elemental analysis, magnetic and spectroscopic measurements (UV-Vis and IR spectra) and single crystal X-ray diffraction technique.
Journal ArticleDOI
Syntheses, crystal structures, spectral and thermal analysis and biological activities of copper(II)-pyridine-2,5-dicarboxylate complexes with 4-methylimidazole, imidazole, and 3,4-dimethylpyridine
TL;DR: In this article, three novel Cu(II)-pyridine-2,5-dicarboxylate (pydc) complexes with 4-methylimidazole (4-Meim), [Cu(Pydc)(H2O)(4Meim)2]· H2O (1), imidazoles (im), {[Cu(μ-pyddc)(im) 2]· 2H 2O}n (2), and 3,4-dimethylpyridis (dmpy
Journal ArticleDOI
A novel anagostic CH⋯Cu interaction and clustered water molecules in copper(II)–pyridine-2,5-dicarboxylate complex
TL;DR: In this article, a new mononuclear Cu(II)-pyridine-2,5-dicarboxylate complex with N,N-diethylethylenediamine (deen), [Cu(pydc)(deen)(H2O)]·2H 2O (1) was synthesized, and the molecular structure of the complex has been determined by single crystal X-ray diffraction.
Journal ArticleDOI
New copper(II) complexes including pyridine-2,5-dicarboxylic acid: synthesis, spectroscopic, thermal properties, crystal structure and how these complexes interact with purified PON 1 enzyme
TL;DR: In this paper, the synthesis of square-pyramidal copper(II) complexes, [Cu(2,5-pydc)(2-aepy)(H2O)]·H 2O, 1, and [cu(2.5- pydc), 2 (2-ampy), 2-(aminoethyl)pyridine, 2-ampY, 2-(aminomethyl)-pyridine, 2,5 pydC), 1, was reported.
Journal ArticleDOI
Pyridine-2,5-dicarboxylic acid complexes of nickel(II) with 2,2′-bipyridine and 1,10-phenanthroline coligands; syntheses, crystal structures, spectroscopic and thermal studies
TL;DR: Two pyridine-2,5-dicarboxylic acid (pydcH2) complexes of nickel(II) with 2,2′-bipyridine and 1,10-phenanthroline were synthesized and characterized by elemental, spectroscopic, thermal analysis, magnetic measurements and single crystal X-ray diffraction techniques as mentioned in this paper.
References
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Journal ArticleDOI
Syntheses, Structures, and Magnetic Properties of Two Gadolinium(III)–Copper(II) Coordination Polymers by a Hydrothermal Reaction
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The effect of pH on the dimensionality of coordination polymers.
TL;DR: It was observed that the increase in pH resulted in a higher connectivity level of ligands, which in turn leads to a higher dimensionality of the crystal structures.
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Syntheses, Structures, and Magnetic Properties of Two Gadolinium(III)-Copper(II) Coordination Polymers by a Hydrothermal Reaction This work is supported by the NNSF of China, the NSF of Fujian Province, and the Key Project from the CAS.
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Self-Assembly of Diorganotin(IV) Oxides (R = Me, nBu, Ph) and 2,5-Pyridinedicarboxylic Acid to Polymeric and Trinuclear Macrocyclic Hybrids with Porous Solid-State Structures: Influence of Substituents and Solvent on the Supramolecular Structure
TL;DR: Evidence has been provided that molecular aggregation to capsules through hydrogen bonding interactions is possible in solution and it has been found that coordinating solvent molecules can change the supramolecular structure completely.
Journal ArticleDOI
Preparations, Structures, and Magnetic Properties of a Series of Novel Copper(II)−Lanthanide(III) Coordination Polymers via Hydrothermal Reaction
TL;DR: The hydrothermal reaction of Ln2O3, pyridine-2,5-dicarboxylic acid, and Cu(II) reagents with a mole ratio of 1:2:4 resulted in the formation of six polymeric Cu( II)-Ln(III) complexes, which are isomorphous and crystallize in triclinic space group Ponebar.