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Lecture Valerie Marvaud


26 April 2010 FWN-Building 5118.-152, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Valerie Marvaud
Affiliation: Institut Parisien de Chimie Moléculaire, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex, France
Title: High spin and photo-switchable high spin molecules
Date: Mon Apr 26, 2010
Start: 14.00
Location: FWN-Building 5118.-152
Host: Petra Rudolf
Telephone: +31 50 363 4736


This presentation intends to point out some recent achievements in the field of high spin and photo-switchable high spin molecules. On one hand, hexacyanometalates revealed in the last few years as very flexible molecular precursors to build high spin and anisotropic molecules with ground spin states ranging from S = 3/2 to 27/2.[1,2] On the other hand, octacyanometalates were also used as precursors for the design and the synthesis of polynuclear complexes, viewed as the first examples of photo-switchable high spin molecules.[3]


The first results have been obtained on a polynuclear complex, MoIVCuII 6 (fig.1). Before light irradiation, this complex behaves as a paramagnetic species, as expected for six isolated paramagnetic CuII ions surrounding a MoIV diamagnetic core. After light excitation, the magnetic properties are found to be consistent with those of a high spin molecule, MoVCuICuII 5 (S = 3). The long-lived photo-induced metastable state is persistent up to an unusually high temperature (300K). Furthermore, the photo-magnetic effect is thermally reversible. The X-ray absorption spectroscopy and XMCD studies performed under synchrotron radiation allowed us to demonstrate the photo-induced electron transfer.


Last modified:22 October 2012 2.30 p.m.