New Photomagnetic Ionic Salts Based on [MoIV(CN)8]4? and [WIV(CN)8]4? Anions

Three new ionic salts containing [M(CN)8]4? (M = MoIV and WIV) were prepared using large complex cations based on a non-conventional motif built with the tris(2-aminoethyl)amine (noted hereafter tren) ligand, [{M’(tren)}3(?-tren)]6+ (M’ CuII ZnII). The crystal structures of three compounds show that atomic arrangement is formed by relatively isolated anionic cationic entities. irradiated blue light at low temperature, significant photomagnetic effect. remarkable properties these are (i) long-lived metastable states for [Mo(CN)8]4?-based well above 200 K (ii) rare efficient [W(CN)8]4?-based compound. These compared singlet-triplet conversion recently reported K4[Mo(CN)8]·2H2O