Abstract
The stability constants and structure of the complexes of CdII and ZnII with 1-ethoxymethylimidazole (ExMeIm), 1-propoxymethylimidazole (PxMeIm), 1-ethoxymethyl-2-methylimidazole (ExMe-2-MeIm) and 1-propoxymethyl-2-methylimidazole (PxMe-2-MeIm) in aqueous solution have been determined by potentiometric methods. ZnII form both tetrahedral and octahedral species with the cited ligands according to the configurational equilibrium type: octahedron ↔ tetrahedron, but CdII prefers octahedral coordination of alkoxymethylimidazole complexes in aqueous solution. Retention of the six-coordination form of CdII has also been confirmed by the data obtained for two novel compounds which have been synthesized in the solid state. The crystal and molecular structure of [Cd(ExMeIm)4(NO3)2] (1) has been determined by X-ray diffraction. The coordination geometry around the CdII ion can be considered as slightly distorted tetragonal bipyramidal (CdN4O2). Additionally, another six-coordinate CdII compound with ethoxymethyl-2-methylimidazole [Cd(ExMe-2-MeIm)4(H2O)](NO3)2 (2) has been characterized by spectroscopic (i.r., far i.r., Raman) ES–MS and t.g.a. methods.
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Barszcz, B., Głowiak, T. & Jabłońska-Wawrzycka, A. Ligation of alkoxymethylimidazoles towards cadmium(II) and zinc(II). X-ray, spectroscopic, thermal and potentiometric investigation. Transition Met Chem 30, 221–228 (2005). https://doi.org/10.1007/s11243-004-2257-2
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DOI: https://doi.org/10.1007/s11243-004-2257-2