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Optical investigation of spin-crossover in cobalt(II) bis-terpy complexes

Real, J. A.
Amstutz, Nahid
Published in Inorganica Chimica Acta. 2007, vol. 360, no. 13, p. 3945-3950
Abstract The spin transition of the [Co(terpy)2]2+ complex (terpy = 2,2':6',2″-terpyridine) is analysed based on experimental data from optical spectroscopy and magnetic susceptibility measurements. The single crystal absorption spectrum of [Co(terpy)2](ClO4)2 shows an asymmetric absorption band at 14 400 cm−1 with an intensity typical for a spin-allowed d–d transition and a temperature behaviour typical for a thermal spin transition. The single crystal absorption spectra of suggest that in this compound, the complex is essentially in the high-spin state at all temperatures. However, the increase in intensity observed in the region of the low-spin MLCT transition with increasing temperature implies an unusual partial thermal population of the low-spin state of up to about 10% at room temperature. Finally, high-spin → low-spin relaxation curves following pulsed laser excitation for [Co(terpy)2](ClO4)2 dispersed in KBr discs, and as a comparison for the closely related [Co(4-terpyridone)2](ClO4)2 spin-crossover compound are given.
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Research group Groupe Hauser
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ENACHESCU, Cristian et al. Optical investigation of spin-crossover in cobalt(II) bis-terpy complexes. In: Inorganica Chimica Acta, 2007, vol. 360, n° 13, p. 3945-3950. doi: 10.1016/j.ica.2007.06.022 https://archive-ouverte.unige.ch/unige:3585

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Deposited on : 2009-10-02

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