Effect of Coordination Geometry on Magnetic Properties in a Series of Cobalt(II) Complexes and Structural Transformation in Mother Liquor

Ghosh, S and Kamilya, S and Das, M and Mehta, S and Boulon, ME and Nemec, I and Rouzières, M and Herchel, R and Mondal, A (2020) Effect of Coordination Geometry on Magnetic Properties in a Series of Cobalt(II) Complexes and Structural Transformation in Mother Liquor. In: Inorganic Chemistry, 59 (10). pp. 7067-7081.

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Abstract

The three Co(II) complexes Co(bbp)2Co(NCS)4·4DMF (1), Co(bbp)(NCS)2(DMF)·2DMF (2), and Co(bbp)(NCS)2 (3) have been synthesized and characterized by single-crystal X-ray diffraction, magnetic, and various spectroscopic techniques. Complexes 1 and 3 are obtained by the reaction of Co(NCS)2 with 2,6-bis(1H-benzodimidazol-2-yl)pyridine (bbp), and complex 1 undergoes a structural transformation to form complex 2. A single-crystal X-ray study revealed that complex 1 is comprised of two Co(II) centers, a cationic octahedral Co(II) unit and an anionic tetrahedral Co(II) unit, while the Co(II) ion is in a distorted-octahedral environment in 2. Moreover, in complex 3, the Co(II) ion is in a distorted-square-pyramidal geometry. The effect of coordination geometry on the magnetic properties was studied by both static and dynamic magnetic measurements. Direct current (dc) magnetic susceptibility measurements showed that all of the Co(II) ions are in high-spin state in these complexes. Alternating current (ac) magnetic susceptibility measurements indicated that complexes 2 and 3 display slow relaxation of magnetization in an external dc magnetic field, while complex 1 displayed no such property. EPR experiments and theoretical calculations were consistent with the above findings.

Item Type:	Journal Article
Publication:	Inorganic Chemistry
Publisher:	AMER CHEMICAL SOC
Additional Information:	The copyright for this article belongs to AMER CHEMICAL SOC
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	22 Jun 2020 11:09
Last Modified:	22 Jun 2020 11:09
URI:	http://eprints.iisc.ac.in/id/eprint/65534

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