Synthesis, structures and magnetic properties of octahedral Co(III) complexes of heteroaromatic hydrazones with tetraisothiocyanato Co(II) anions

• DOI: 10.1016/j.poly.2018.08.070
• Publication Date: 2018-09-07T10:04:10Z
• Authors: Božidar Čobeljić; Iztok Turel; Andrej Pevec; Zvonko Jagličić; Dušanka Radanović; Katarina Anđelković; Milica R. Milenković
• Keywords: Co(III) and Co(II) complexes; X-ray; Thiocyanate; Magnetic properties; Hydrazones; 01 natural sciences; 0104 chemical sciences

Abstract Octahedral Co(III) complexes with heteroaromatic hydrazones ((E)-N,N,N-trimethyl-2-oxo-2-(2-(1-(pyridin-2-yl)ethylidene)hydrazinyl)ethan-1-aminium chloride and (E)-2-(1-(thiazol-2-yl)ethylidene)hydrazine-1-carbothioamide) and tetraisothiocyanato Co(II) complex anions have been synthesized, characterized by elemental analysis, IR and NMR spectroscopy, single-crystal X-ray diffraction and magnetic measurements. NMR spectroscopy showed that octahedral Co(III) complex cations of both compounds are stable in DMSO solution. Measured effective magnetic moments, which completely originates from complex anion [Co(NCS)4]2– are practically constant and very close to the expected value for Co2+ ion with spin S = 3/2 and completely quenched orbital angular momentum. Co(III) ions in octahedral complex cations are in a low spin magnetic state with S = 0 and do not contribute to the magnetic signal.