Abstract
The sodium salt of the dihydrobis(1-methyl-5-thiotetrazolyl)borato anion [Btt Me] − has been synthesized by the reaction of NaBH 4 with 1-methyl-5-thiotetrazole. Treatment of Na[Btt Me] with anhydrous CoCl 2 and NiCl 2 · 6H 2O, respectively, gives the complexes Co(Btt Me) 2 ( 1) and Ni(Btt Me) 2 ( 2), which have been characterized by IR, 1H NMR, ESI-MS, UV–Vis spectroscopy as well as X-ray crystallography. Compound 1 contains a central [CoS 4] core and exhibits a slightly distorted trigonal-bipyramidal coordination geometry with a very weak apical Co⋯H–B interaction, whereas 2 features a central [NiS 4H 2] core in a distorted octahedral coordination geometry and exhibits relatively strong Ni⋯H–B interactions. These results indicate that the ligand can act in the bidentate ( k 2-S,S) or tridentate ( k 3-S,S,BH) mode. The electrochemical behavior of 1 and 2 has also been investigated by cyclic voltammetry.
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