Spin Crossover and Paramagnetic Behaviour in Two-Dimensional Iron(II) Coordination Polymers with Stilbazole Push–Pull Ligands

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Contents Vol 62(9)

doi:10.1071/CH09100

Spin Crossover and Paramagnetic Behaviour in Two-Dimensional Iron(ii) Coordination Polymers with Stilbazole Push–Pull Ligands*

Gloria Agustí ^A, Ana Belén Gaspar ^A ^D, M. Carmen Muñoz ^B, Pascal G. Lacroix ^C, José Antonio Real ^A ^D

^A Institut de Ciència Molecular (ICMOL)/Departament de Química Inorgànica, Universitat de València, Edifici d’Instituts de Paterna, Apartat de Correus 22085, 46071 València, Spain.
^B Departament de Física Aplicada, Universitat Politécnica de València, Camí de Vera s/n, 46022 València, Spain.
^C Laboratoire de Chimie de Coordination, CNRS, 205 route de Narbonne, Toulouse, France.
^D Corresponding authors. Email: ana.b.gaspar@uv.es; jose.a.real@uv.es





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Australian Journal of Chemistry 62(9) 1155–1165 http://dx.doi.org/10.1071/CH09100
Submitted: 19 February 2009 Accepted: 7 April 2009 Published online: 17 September 2009

Abstract

The suitability of the stilbazole push–pull ligands, 4′-dimethylaminostilbazole (DMAS) and 4′-diethylaminostilbazole (DEAS), for the construction of bimetallic Fe^II–Ag^I/Au^I cyanide-based coordination polymers that exhibit spin crossover properties is investigated. The structural and physical characterization of four novel two-dimensional Fe^II polymers formulated as {Fe(DMAS)₂[Ag(DMAS)(CN)₂]₂} (1) and {Fe(L)₂[M(CN)₂]₂} (L = DMAS, M = Au (2); DEAS, Ag (3); DEAS, Au (4)) is reported. Polymers 1 and 4 are paramagnetic over the whole range of temperatures studied (5–300 K), whereas 2 and 3 exhibit spin crossover properties.