Investigation of the photoinduced magnetization of copper octacyanomolybdates nanoparticles by X-ray magnetic circular dichroism

Sophie Brossard (1) , Florence Volatron (2) , Laurent Lisnard (2) , Marie-Anne Arrio (1) , Laure Catala (2) , Corine Mathonière (3) , Talal Mallah (2) , Christophe Cartier Dit Moulin (4) , Andrei Rogalev (5) , Fabrice Wilhelm (5) , Alevtina Smekhova (5) , Philippe Sainctavit (1)

1 IMPMC - Institut de minéralogie et de physique des milieux condensés
2 ICMMO - Institut de Chimie Moléculaire et des Matériaux d'Orsay
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
4 IPCM - Institut Parisien de Chimie Moléculaire
5 ESRF - European Synchrotron Radiation Facility

Through an extensive set of SQUID magnetic measurements, X-ray absorption spectroscopy, and X-ray magnetic circular dichroism, we have determined the nature of the metastable photomagnetic phase in the cyano-bridged 3D network Cs(2)Cu(7)[Mo(CN)(8)](4). The photomagnetic effect is induced by the photoconversion of Mo(IV) ions in low spin (LS) configuration (S = 0) into Mo(IV) ions in high spin (HS) configuration (S = 1). The magnetic and spectroscopic measurements fully support the LS to HS conversion, whereas the previously invoked charge transfer mechanism Mo(IV) + Cu(II) ⇒ Mo(V) + Cu(I) can be completely ruled out.

Mots clés: Metastable photomagnetic phase; Copper; Chemical compounds; SQUID; X-ray absorption spectroscopy

Domaines: Matériaux

Sophie Brossard, Florence Volatron, Laurent Lisnard, Marie-Anne Arrio, Laure Catala, et al.. Investigation of the photoinduced magnetization of copper octacyanomolybdates nanoparticles by X-ray magnetic circular dichroism. Journal of the American Chemical Society, 2012, 134 (1), pp.222-228. ⟨10.1021/ja204594a⟩. ⟨hal-00661289⟩