Solvent Dependent Spin‐Crossover and Photomagnetic Properties in an Imidazolylimine FeII Complex |
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Authors: | Rosanna J Archer Hayley S Scott Matthew IJ Polson Corine Mathonire Mathieu Rouzires Rodolphe Clrac Paul E Kruger |
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Institution: | Rosanna J. Archer,Hayley S. Scott,Matthew I.J. Polson,Corine Mathonière,Mathieu Rouzières,Rodolphe Clérac,Paul E. Kruger |
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Abstract: | The synthesis and physico‐chemical characterization of an FeII complex Fe( L1 )3](ClO4)2?CH3CN?0.5H2O, 1 , incorporating a bidentate imidazolylimine‐based ligand are reported. Complex 1 crystallises as the mer‐isomer and the crystal lattice is replete with hydrogen bonding interactions between ClO4? anions, solvent molecules and imidazole N‐H groups. Variable‐temperature structural, magnetic, photomagnetic and optical reflectivity techniques have been deployed to fully characterise the spin‐crossover (SCO) behaviour in 1 along with its desolvated phase, 1?desolv . Variable‐temperature (1.8–300 K) magnetic‐susceptibility measurements reveal a broad two‐step full SCO for 1 (T1/2=158 and 184 K) and photomagnetic experiments at 10 K under white‐light irradiation revealed complete photo‐induced SCO. 1?desolv displays considerably different magnetic behaviour with sharp single‐step SCO accompanied by a thermal hysteresis (T1/2↑=105 K, T1/2↓=95 K) in addition to full photo‐induced SCO at lower temperatures. |
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Keywords: | molecular magnetism photomagnetism solvent-effects spin-crossover supramolecular |
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