Solvent Dependent Spin-State Behaviour via Hydrogen Bonding in Neutral FeII Diimine Complexes

Kelsey A. Schulte; Stephanie R. Fiedler; Matthew P. Shores

doi:10.1071/CH14145

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Solvent Dependent Spin-State Behaviour via Hydrogen Bonding in Neutral Fe^II Diimine Complexes

Kelsey A. Schulte ^A , Stephanie R. Fiedler ^A and Matthew P. Shores ^A ^B

+ Author Affiliations

- Author Affiliations

^A Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA.

^B Corresponding author: Email: matthew.shores@colostate.edu

Australian Journal of Chemistry 67(11) 1595-1600 https://doi.org/10.1071/CH14145
Submitted: 13 March 2014 Accepted: 3 June 2014 Published: 1 September 2014

Abstract

We report the syntheses, structures, and magnetic properties of cis-[Fe(pizR)₂(NCS)₂] complexes based on the pyridyl imidazoline ligands 2-(2′-pyridinyl)-4,5-dihydroimidazole (pizH, 1) and 2-(2′-pyridinyl)-4,5-dihydro-1-methylimidazole (pizMe, 2). The ligands, complexes, and magnetic measurements are chosen to separate hydrogen-bonding and intrinsic ligand field properties, so as to improve our understanding of the effect of hydrogen-bonding interactions on spin-state switching. In the solid state, both complexes are high spin between 5 and 300 K. In deuterated methanol and acetonitrile solutions, both complexes show gradual thermal spin crossover. Complex 1, capable of hydrogen bonding, shows solvent-sensitive spin crossover, whereas spin crossover in the methylated analogue 2 is insensitive to solvent identity.

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Solvent Dependent Spin-State Behaviour via Hydrogen Bonding in Neutral FeII Diimine Complexes

Abstract

References

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Solvent Dependent Spin-State Behaviour via Hydrogen Bonding in Neutral Fe^II Diimine Complexes