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Polymorphism in the spin-crossover ferric complexes [(TPA)Fe(III)(TCC)]PF6.

Abstract : We have identified two polymorphs of the molecular complex [(TPA)Fe((III))(TCC)]PF(6) [TPA = tris(2-pyridylmethyl)amine and TCC = 3,4,5,6-tetrachlorocatecholate dianion]: one is monoclinic and the other is orthorhombic. By lowering the temperature both undergo a thermal spin-crossover between a high-spin (S = 5/2) and a low-spin (S = 1/2) state, which we detected by magnetic, optical and X-ray diffraction measurements. The thermal crossover is only slightly shifted between the polymorphs. Their crystalline structures consist of similar cation layers alternating with PF(6) anion layers, packed differently in the two polymorphs. The magnetic and optical properties of the polymorphs are presented.
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Contributor : Dorothée Destouches <>
Submitted on : Friday, February 3, 2012 - 11:25:17 AM
Last modification on : Friday, July 9, 2021 - 1:06:02 PM

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Eric Collet, Marie-Laure Boillot, Johan Hebert, Nicolas Moisan, Marina Servol, et al.. Polymorphism in the spin-crossover ferric complexes [(TPA)Fe(III)(TCC)]PF6.. Acta Crystallographica Section B: Structural Science, International Union of Crystallography, 2009, 65 (Pt 4), pp.474-80. ⟨10.1107/S0108768109021508⟩. ⟨hal-00665933⟩



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