Issue 49, 2020, Issue in Progress

Novel tetrahedral cobalt(ii) silanethiolates: structures and magnetism

Abstract

Three heteroleptic complexes of Co(II) tri-tert-butoxysilanethiolates have been synthesized with piperidine [Co{SSi(OtBu)3}2(ppd)2] 1, piperazine [Co{SSi(OtBu)3}2(NH3)]2(μ-ppz)·2CH3CN 2, and N-ethylimidazole [Co{SSi(OtBu)3}2(etim)2] 3. The complexes have been characterized by a single-crystal X-ray, revealing their tetrahedral geometry on Co(II) coordinated by two nitrogen and two sulfur atoms. Complexes 1 and 3 are mononuclear, whereas 2 is binuclear. The spectral properties and thermal properties of 1–3 complexes were established by FTIR spectroscopy for solid samples and TGA. The magnetic properties of complexes 1, 2, and 3 have been investigated by static magnetic measurements and X-band EPR spectroscopy. These studies have shown that 1 and 3, regardless of the similarity in structure of CoN2S2 cores, demonstrate different types of local magnetic anisotropy. Magnetic investigations of 2 reveal the presence of weak antiferromagnetic intra-molecular Co(II)–Co(II) interactions that are strongly influenced by the local magnetic anisotropy of individual Co(II) ions.

Graphical abstract: Novel tetrahedral cobalt(ii) silanethiolates: structures and magnetism

Supplementary files

Article information

Article type
Paper
Submitted
10 Jul 2020
Accepted
31 Jul 2020
First published
06 Aug 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 29100-29108

Novel tetrahedral cobalt(II) silanethiolates: structures and magnetism

D. Kowalkowska-Zedler, N. Nedelko, K. Kazimierczuk, P. Aleshkevych, R. Łyszczek, A. Ślawska-Waniewska and A. Pladzyk, RSC Adv., 2020, 10, 29100 DOI: 10.1039/D0RA06036D

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