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Issue 24, 2018
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Varied spin crossover behaviour in a family of dinuclear Fe(ii) triple helicate complexes

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Abstract

Dinuclear triple-helicate complexes of the formula [Fe2L3](BF4)4·solv (solv = CH3CN, CHCl3, H2O) have been synthesised and structurally characterised. The bis-bidentate ligands, L, present either strong-field 2-pyridylimine (1) or weaker-field 2-imidazolylimine (2) and 4-imidazolylimine (3) coordination spheres about Fe(II) centres in an octahedral geometry. Whereas 1 is pervasively diamagnetic, spin crossover (SCO) behaviour is observed in 2 and 3 and has been studied using variable-temperature structural, UV-visible spectroscopic, magnetic and photo-magnetic techniques. Variable-temperature (1.8–400 K) magnetic-susceptibility measurements reveal the T1/2 values of 2 and 3 to be strongly dependent upon the solvent and degree of solvation. Photomagnetic studies at 10 K under white-light irradiation revealed an inefficient photo-induced SCO in 2, but full switching in 3.

Graphical abstract: Varied spin crossover behaviour in a family of dinuclear Fe(ii) triple helicate complexes

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Article information


Submitted
20 Apr 2018
Accepted
25 May 2018
First published
25 May 2018

Dalton Trans., 2018,47, 7965-7974
Article type
Paper

Varied spin crossover behaviour in a family of dinuclear Fe(II) triple helicate complexes

R. J. Archer, H. S. Scott, M. I. J. Polson, B. E. Williamson, C. Mathonière, M. Rouzières, R. Clérac and P. E. Kruger, Dalton Trans., 2018, 47, 7965
DOI: 10.1039/C8DT01567H

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