Issue 4, 2011

Investigation of anion-dependence in the spin-state switching properties of [(H2bip)2Fe(6-Mebpy)]X2

Abstract

We report the syntheses, characterisations and magnetic properties of salts of the heteroleptic Fe(II) complex [(H2bip)2Fe(6-Mebpy)]X2 (X = Br (1), BPh4 (2), H2bip = 2,2′-bi-1,4,5,6-tetrahydropyrimidine, 6-Mebpy = 6-methyl-2,2′-bipyridine). The ditopic H2bip ligand serves as an anion binding group while 6-Mebpy is intended to adjust the complex ligand field. Thermally induced spin-crossover properties are observed in the solid state and solution, and are heavily influenced by the nature of the anion. Anion-triggered spin-state switching is observed for the heteroleptic complex in dichloromethane solution at 193 K, above background processes of ligand dissociation and rearrangement. Although substitution of 6-Mebpy appears to increase the ligand field encountered by the Fe(II) ion, salt 2 responds to bromide at a significantly lower temperature than the parent homoleptic complex salt [Fe(H2bip)3](BPh4)2.

Graphical abstract: Investigation of anion-dependence in the spin-state switching properties of [(H2bip)2Fe(6-Mebpy)]X2

Supplementary files

Article information

Article type
Paper
Submitted
21 Aug 2010
Accepted
09 Nov 2010
First published
06 Dec 2010

Dalton Trans., 2011,40, 944-950

Investigation of anion-dependence in the spin-state switching properties of [(H2bip)2Fe(6-Mebpy)]X2

Z. Ni, S. R. Fiedler and M. P. Shores, Dalton Trans., 2011, 40, 944 DOI: 10.1039/C0DT01079K

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