Synthesis, structure, spectra and redox activities of model compounds for methanogenic bacteria |
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Authors: | T. Pandiyan, C. Durá n de Bazú a M. Soriano-Garcia |
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Affiliation: | (1) Facultad de Química, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, 04510 México D.F., México;(2) Instituto de Química, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, 04510 México D.F., México |
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Abstract: | Synthetically accessible benzimidazoles have been synthesized and the benzimidazole ligands were complexed with nickel(II) nitrate. A nickel(II) complex of N,N-bis(benzimidazole-2-ylethyl)ethylenediamine was crystallized in single-crystal form and the structure was investigated by X-ray crystallography. The structure of the complex is bicapped axial coordinated octahedral. Ni(bbes)2+2[bbes=bis(benzimidazole-2-ylethyl)sulfide] exhibits broad low energy bands in electronic spectra and high redox potential in cyclic voltammetry (CV) rather than Ni(enbzim)2+ [enbzim =N,N-bis(benzimidazol-2-ylethyl)ethylenediamine], where high energy well separated bands were observed in the visible region and a more negative redox potential was detected in CV. Experimental studies show that an increasing amount of -orbital interaction with the Ni2+ion, irrespective of chelate ring may favour the higher redox potential. The higher redox potential of methanogenic bacterial [Ni(II)/Ni(I)] than nickel compounds is one of the main factors for the degradation of organic biodegradable compounds and the further transformation to methane. |
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