Creatinine complexes of zinc, cadmium and mercury
TL;DR: In this paper, Zinc, cadmium and mercury(II) complexes of creatinine of the composition M(Creat) 2 X 2 (X = Cl, Br or I) are characterized by analytical and spectral methods.
About: This article is published in Polyhedron.The article was published on 1984-01-01. It has received 26 citations till now. The article focuses on the topics: Zinc & Nuclear magnetic resonance spectroscopy.
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TL;DR: In this article, a three-dimensional supramolecular architecture is formed not only by simple proton transfer from pyridine-2,4-dicarboxylic acid to creatinine, but also by other very important non-covalent interactions, especially the ion pairing, hydrogen bonds, N−H···π and C−O−π interactions.
Abstract: Pyridine-2,4-dicarboxylic acid (py-2,4-dcH2) and creatinine (creat) with MCl2·6H2O (M = CoII and NiII) formed two isomorph supramolecular coordination compounds. Their three-dimensional supramolecular architecture is formed not only by simple proton transfer from pyridine-2,4-dicarboxylic acid to creatinine, but also by other very important non-covalent interactions, especially the ion pairing, hydrogen bonds, C–H···π, N–H···π and C–O···π interactions. In these complexes, pyridine-2,4-dicarboxylate acts as a bidentate ligand and the lattice is composed of anionic hexacoordinated complex, [M(py-2,4-dc)2(H2O)2]2− (M = CoII and NiII), creatinium counter ion, (creatH)+, and two uncoordinated water molecules. The complexation equilibrium and stabilities of proton transfer, binary and ternary complexes of pyridine-2,4-dicarboxylic acid as a primary ligand and creatinine as a secondary ligand with Co2+ and Ni2+ transition metal ions in comparison with X-ray crystal structures in solid state have studied.
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Abstract: Phenylmercury(II) replaces a proton of creatine, H2NC+(NH2)NMeCH2C02-, in basic solution to form the zwitterionic
complex PhHgNHC+(NH2)NMeCH2CO2-. Creatine and creatinine (C4H7N30) react with PhHg((OH)N03)I/2 in aqueous ethanol to form a 2:l complex [(PhHg)2(C4H6N30][N03] which exists in two crystalline forms. Creatinine forms a 1:l
complex [PhHg(C4H7N30)][N03].1/2H20 at pH 1.4 on reaction with PhHg((OH)N03)l/2 in the presence of nitric acid.
The 1:l and 2:l complexes may be interconverted. Creatinine hydronitrate, [H2NCNMeCH2CONH][NO3], and the PhHg(II) complexes of creatinine have similar infrared (including deuterated derivatives) and 1H NMR spectra, consistent with retention of the creatinine ring and presence of a guanidinium group in the complexes. An X-ray structural analysis of one crystalline form of the 2:l complex shows bonding of PhHg(II) groups to the exocyclic and ring nitrogens of creatinine to form the cation
[PhHgNHCNMeCH2CONHgPh]+.
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