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

作者：Archer Rosanna J; Scott Hayley S; Polson Matthew I J; Williamson Bryce E; Mathoniere Corine; Rouzieres Mathieu; Clerac Rodolphe^*; Kruger Paul E^*

来源：Dalton Transactions, 2018, 47(24): 7965-7974.

DOI：10.1039/c8dt01567h

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 T-1/2 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.

• 出版日期2018-6-28