High spin and photomagnetic high spin molecules

Abstract

As part of our research activities devoted to molecular magnetism, we are interested in synthesising polynuclear compounds showing both large spin ground state and anisotropy. For this purpose, polycyanometalate precursors have been used successfully, with an effective control of the chemistry, which consist to firstly prepare polydentate ligands and their corresponding mononuclear complexes with varied metallic centre such as Mn, Ni, Co, Cu, before synthesising polynuclear compounds with tunable geometry. Thus, bi, tri-, tetra-, hexaand heptanuclear species have been obtained in this way with a spin state value ranging from 3/2 to 27/2. The step by step rational synthesis allows us to synthesize as well hetero-trimetallic complexes such as CrNi2Mn4 (S=13/2) and several polynuclear species obtained from octacyanometalate precusors, for instance WCu6, WNi6 and WMn6 and the corresponding molybdenium species. This part of the work devoted to octacyanometalate chemistry paves the way of photomagnetic Single Molecule Magnets. We already succeeded in getting the first photomagnetic high spin molecule !