Transition metal complexes with thiosemicarbazide-based ligands: Part 59. Synthesis, structures and electrochemical properties of cobalt(III) complexes with 2-acetylpyridine S-methylisothiosemicarbazone

The subject of the work is the synthesis and single crystal X-ray analysis of the cobalt(III) complexes with 2-acetylpyridine S-methylisothiosemicarbazone (HL), of the coordination formulas [CoL2]NO3·MeOH(1), [CoL2]Br·MeOH(2), [CoL2]HSO4·MeOH(3), [CoL2]2[CoII(NCS)4](4), [Co(HL)(L)]I2·2MeOH(5), and [Co(HL)(L)][CoIICl4]·MeOH (6), as well as of the structure of HL. In all the complexes, Co(III) is situated in a slightly deformed octahedral environment formed by six nitrogen atoms of the two HL molecules in the meridional positions.