Abstract
For a comparison of structural data and thermal behaviour of Zn(II) and Cd(II) complexes with biologically important ligand, 2-hydroxymethylbenzimidazole (L) the complex of the formula [ZnL3](NO3)2L0.67L′0.33 was prepared and characterized by elemental analysis, infrared (IR) spectra, single-crystal X-ray diffraction and thermal analysis (where L′ = 2-carbaldehydebenzimidazole). IR and X-ray studies have confirmed a bidentate fashion of coordination of the 2-hydroxymethylbenzimidazole to Zn(II) ion (through the nitrogen atom of heteroaromatic ring and oxygen atom of hydroxymethyl group). The zinc ion is hexacoordinated and the shape of polyhedron can be described as pseudo-octahedron (N3O3 chromophore type). The decomposition process of studied Zn(II) and Cd(II) benzimidazole complexes in the air atmosphere proceeds in three or four main stages and traces structures of complexes. On the basis of the first DTGmax of the decompositions the thermal stability of the complexes follows the order: [CdL3](NO3)2LEtOH0.25 < [CdL2(NO3)2] < [ZnL3](NO3)2L0.67L′0.33. As the final solid products of thermal decomposition suitable metal oxides are formed.
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The authors are grateful to Dr Wiesław Surga for help during the thermal work.
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Jabłońska-Wawrzycka, A., Barszcz, B. & Stadnicka, K. Similarities and differences of thermal behaviour of 2-hydroxymethylbenzimidazole complexes with Zn(II) and Cd(II) ions. J Therm Anal Calorim 101, 463–469 (2010). https://doi.org/10.1007/s10973-010-0791-z
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DOI: https://doi.org/10.1007/s10973-010-0791-z