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Open AccessArticle

Heteroleptic Iron(III) Spin Crossover Complexes; Ligand Substitution Effects

School of Chemistry, Building 23, Monash University, Clayton, Victoria 3800, Australia
School of Physics and Astronomy, Monash University, Clayton, Victoria, Australia 3800, Australia
Author to whom correspondence should be addressed.
Academic Editors: Guillem Aromí and José Antonio Real
Magnetochemistry 2016, 2(1), 3;
Received: 23 December 2015 / Revised: 10 January 2016 / Accepted: 13 January 2016 / Published: 22 January 2016
(This article belongs to the Special Issue Spin Crossover (SCO) Research)
Heteroleptic iron(III) complexes of formula [Fe(qsal-Cl)(thsa)]∙nMeCN have been synthesized; [Fe(qsal-Cl)(thsa)]∙MeCN, 1 and [Fe(qsal-Cl)(thsa)], 2. The latter can be obtained by slow evaporation of solutions of compound 1 under ambient conditions, a rare occurrence in nonporous compounds. 1 interestingly shows a unique magnetic profile over the de-solvation temperature range, 300-350 K, in the first cycle, and becomes stable after the third cycle with a hysteresis width of about 20 K. Different de-solvation techniques used on compound 1 give rise to various stable de-solvated phases. Consequently, distinct magnetic profiles, with a larger hysteresis width of about 30 K, are present. Cl substitution on the qsal ligand introduces C–H∙∙∙Cl and P4AE interactions into the structure which are absent in the related unsubstituted compound, [Fe(qsal)(thsa)]∙0.5MeCN, 3. Comparisons in structural packing, as well as spin crossover properties between unsubstituted and Cl-substituted ligand compounds, are discussed. View Full-Text
Keywords: iron(III); spin crossover; heteroleptic; supramolecular; de-solvation effects iron(III); spin crossover; heteroleptic; supramolecular; de-solvation effects
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Phonsri, W.; Macedo, D.S.; Moubaraki, B.; Cashion, J.D.; Murray, K.S. Heteroleptic Iron(III) Spin Crossover Complexes; Ligand Substitution Effects. Magnetochemistry 2016, 2, 3.

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