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Article Dans Une Revue Dalton Transactions Année : 2018

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

Résumé

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) magneticsusceptibility 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.

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Matériaux
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Dates et versions

hal-01822500 , version 1 (25-06-2018)

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Rosanna Archer, Hayley Scott, Matthew Polson, Bryce Williamson, Corine Mathonière, et al.. Varied spin crossover behaviour in a family of dinuclear Fe( ii ) triple helicate complexes. Dalton Transactions, 2018, 47 (24), pp.7965 - 7974. ⟨10.1039/c8dt01567h⟩. ⟨hal-01822500⟩
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