Journal article
Effect of counteranion X on the spin crossover properties of a family of diiron(II) triazole complexes [FeII2(PMAT) 2](X)4
JA Kitchen, NG White, GNL Jameson, JL Tallon, S Brooker
Inorganic Chemistry | AMER CHEMICAL SOC | Published : 2011
DOI: 10.1021/ic200308k
Abstract
Seven diiron(II) complexes, [FeII2(PMAT) 2](X)4, varying only in the anion X, have been prepared, where PMAT is 4-amino-3,5-bis{[(2-pyridylmethyl)-amino]methyl}-4H-1,2,4-triazole and X = BF4- (1), Cl- (2), PF6 - (3), SbF6- (4), CF3SO 3- (5), B(PhF)4- (6), and C 16H33SO3- (7). Most were isolated as solvates, and the microcrystalline ([3], [4] ·2H2O, [5] ·H2O, and [6] ·1/2MeCN) or powder ([2] ·4H2O, and [7] ·2H2O) samples obtained were studied by variable-temperature magnetic susceptibility and Mössbauer methods. A structure determination on a crystal of [2] ·2MeOH· H2O, revealed it to be a [LS-HS] mixed low spin (LS)-high spin (HS) state dinuclear complex at 90 K, but fully high spin, [HS-HS]..
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Funding Acknowledgements
This work was supported by grants from the University of Otago, the MacDiarmid Institute for Advanced Materials and Nanotechnology, and the RSNZ Marsden Fund, We are grateful to Professor Martin Albrecht (University College Dublin, previously University of Fribourg) and Claudio Gandolfi (University of Fribourg) for testing the ability of [7] center dot 2H<INF>2</INF>O to form a Langmuir film, and to Dr. Victoria A. Milway (Brooker group) for helpful discussions regarding our magnetic data. This paper is dedicated to Mrs. Marianne Dick on the occasion of her retirement from the Campbell Microanalytical Laboratory.