Abstract
In the neutral title complex [Cu(C4N2H3)2(H2O)3] or [Cu(BBR)2(H2O)3] (BBR− = Barbiturate), the CuII ion, in the slightly distorted square-pyramidal geometry, is coordinated by two O atoms of the two monodentate barbiturates and three O atoms of three water ligands. The average bond length of Cu—O (BBR−) is 1.981(5) Å and the average bond length of Cu—O (H2O) at the basal sites is 1.94(5) Å, i.e. much shorter than that of Cu—O (H2O) [2.175(11) Å]. The crystal structure is characterized by an extensive network of hydrogen bonds in which each [Cu(BBR)2(H2O)3] entity links to six adjacent [Cu(BBR)2(H2O)3] by O(C=O) ··· H—O(H2O) bonds. Tautomerism in the coordination process for BBR− was found from the crystal structure and i.r. spectral analysis. The interaction of CuII and BBR− in aqueous solution was also investigated by electronic spectra and electrochemical method. It was observed that the copper ion could not only form the [Cu(BBR)2(H2O)3] complex in aqueous but also catalyze the decomposition of BBR− at pH 1.1.
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Xiong, Y., He, C., An, TC. et al. An approach to the structure and spectra of copper barbiturate trihydrate. Transition Metal Chemistry 28, 69–73 (2003). https://doi.org/10.1023/A:1022592701631
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DOI: https://doi.org/10.1023/A:1022592701631