First example of photomagnetic effects in ionic pairs [Ni(bipy)3]2[Mo(CN)8] · 12H2O

Tomasz Korzeniak (1) , Corine Mathonière (2) , Abdellah Kaiba (2) , Philippe Guionneau (2) , Marcin Koziel (1) , Barbara Sieklucka (1)

1 Faculty of Chemistry
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Ionic triads formed by [NiII(bipy)3]2+ (bipy = 2,20-bipyridyl) and diamagnetic [MIV(CN)8]4 (M = Mo and W) were prepared and structurally characterized. The two compounds are isostructural and their structure consists of a three-dimensional hydrogen-bonded framework where cation–anion interactions occur through short contacts M–CN H–C(bipy). Before irradiation, the Mo analogue behaves as paramagnet with small intermolecular interactions between the [NiII(bipy)3]2+ cations. Upon irradiation with visible light, it exhibits a reversible photomagnetic effect, which is interpreted in terms of the formation of paramagnetic [MoV(CN)8]3 and [NiII(bipy)2(bipy )]+ due to the outer-sphere electron transfer.

Mots clés: Coordination compounds; Octacyanomolybdate; Electron transfer; Magnetism; Photomagnetism

Domaines: Matériaux

Tomasz Korzeniak, Corine Mathonière, Abdellah Kaiba, Philippe Guionneau, Marcin Koziel, et al.. First example of photomagnetic effects in ionic pairs [Ni(bipy)3]2[Mo(CN)8] · 12H2O. Inorganica Chimica Acta, 2008, 361 (12-13), pp.3500-3504. ⟨10.1016/j.ica.2008.03.001⟩. ⟨hal-00324030⟩