Reversible thermo-induced spin crossover in a mononuclear: Cis-dicyanamido-cobalt(ii) complex containing a macrocyclic tetradentate ligand

Ghosh, S and Selvamani, S and Mehta, S and Mondal, A (2020) Reversible thermo-induced spin crossover in a mononuclear: Cis-dicyanamido-cobalt(ii) complex containing a macrocyclic tetradentate ligand. In: Dalton Transactions, 49 (27). pp. 9208-9212.

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Abstract

We present a unique investigation of a mononuclear cis-dicyanamido-cobalt(ii) complex, [Co(L)(N(CN)2)2] (1) (L = N,N′-di-tert-butyl-2,11-diaza[3,3](2,6)pyridinophane), which displays a reversible thermo-induced HS (S = 3/2) to LS (S = 1/2) Spin Crossover (SCO) with a T1/2 value of around 238 K. The appropriate ligand field strength around the CoN6 coordination environment is obtained using a tetradentate ligand and two dicyanamide [N(CN)2]- coligands at the cis position. Variable temperature XRD and several spectroscopic studies have been performed, which confirm the SCO behavior of 1. Interestingly, complex 1 pronounces redox stimulus responsive reversible spin-state switching from HS Co(ii) to LS Co(iii). These findings represent a rare example of the successful use of pseudohalide to design and synthesize a SCO cobalt(ii) complex.

Item Type:	Journal Article
Publication:	Dalton Transactions
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to Royal Society of Chemistry.
Keywords:	Ligands; Spectroscopic analysis, Cobalt complexes; Coordination environment; Ligand field; Spectroscopic studies; Spin crossovers; Spin-state switching; Tetradentate ligands; Variable temperature, Cobalt compounds, article; controlled study; crossover procedure; human; oxidation reduction reaction
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	03 Feb 2023 04:59
Last Modified:	03 Feb 2023 04:59
URI:	https://eprints.iisc.ac.in/id/eprint/79821

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