Nickel(II) and nickel(III) thiosemicarbazone and hydrazone complexes: An unexpected journey

• DOI: 10.1016/j.inoche.2023.111582
• Publication Date: 2023-10-17T16:22:26Z
• Authors: Mima Jevtović; Andrej Pevec; Iztok Turel; Dušanka Radanović; Miloš Milčić; Maja Gruden; Matija Zlatar; Dragana Mitić; Katarina Anđelković; Božidar Čobeljić
• Keywords: nickel(III); Schiff base ligands; complexes; synthesis; X-ray structure; EPR; syngle crystal; nickel(II); DFT; 01 natural sciences; 0104 chemical sciences

In this paper, we report the synthesis, characterization, and X-ray structure analysis of one octahedral Ni(II) complex, [Ni(HL1 )2](BF4)2*H2O, formed by coordination of two ligands with NNS donor atom sets (HL1 ligand, (E)-2-(1-(thiazol-2-yl)ethylidene)hydrazine-1-carbothioamide), and Ni(III) complex, [Ni(L2 )(N3)3], formed by coordination of one hydrazone ligand coordinated through NNO donor set and three azide anions (HL2Cl ligand, (E)−1-(2-oxo-2-(2-(1-(pyridin-2- yl)ethylidene)hydrazinyl)ethyl)pyridin-1-ium chloride), complemented by DFT calculations. To the best of our knowledge this is the first Ni(III) complex obtained under ambient conditions.