Thiocyanate precursor impact on the formation of cobalt complexes: Synthesis and characterization

Author(s) Hannachi, A.; Valkonen, A.; Rzaigui, M.; Smirani, W.
Journal Polyhedron
Date Published 03/2019
Abstract Two new thiocyanate complexes have been synthesized with two different thiocyanate anion sources using 1-(2-pyrimidyl)piperazine and CoCl2·H2O. These compounds were characterized by single X-ray diffraction, FTIR, UV–Vis and TGA–DTA. The antibacterial activity was also examined. The XRD showed that compounds 1 and 2 crystallized into monoclinic and orthorhombic systems, respectively. In compound 1, cobalt is surrounded by two isothiocyanate anions and two nitrogen-amides, while in compound 2 it is surrounded by four isothiocyanate ligands and a separate protonated amide. Different interactions packed the system through NH⋯S, NH⋯O and OH⋯S hydrogen bonds forming a ring. Gap energy determination revealed two diverse behaviors, the first being characteristic of a semiconductor and the second of an insulator. In the 10–500 °C range, the thermal behaviors were investigated and showed the decomposition of the two complexes with metal complexes residues. The antibacterial analysis presented a weak performance.
DOI 10.1016/j.poly.2018.12.039
ISSN 0277-5387
Citation Polyhedron. 2019;161:222230.

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