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Phosphine Oxide Ligand Based Tetrahedral CoII Complexes with Field‐induced Slow Magnetic Relaxation Behavior Modified by Terminal Ligands
Authors:Rui‐Chong Yang  Dan‐Ru Wang  Jun‐Liang Liu  Yu‐Fei Wang  Wei‐Quan Lin  Ji‐Dong Leng  Ai‐Ju Zhou
Abstract:Two isostructural mononuclear CoII complexes, Co(xantpo)(NCE)2] (E=S ( 1 ) and O ( 2 ); xantpo=9,9‐dimethyl‐4,5‐bis(diphenylphosphoryl) xanthene), supported by a bidentate phosphine oxide ligand are reported. The cobalt complexes exhibit characteristic tetrahedral structures coordinated with two oxygen and two nitrogen atoms. Magnetic property measurements show their similar static magnetic behaviours but very different dynamic magnetic behaviours. Both complexes show field‐induced slow magnetic relaxation behaviours, but the relaxation of 2 is much slower than that of 1 . Fittings to the magnetic data and ab initio CASSCF calculations reveal significant changes in the zero field splitting (ZFS) parameters (D and E), which can be attributed to the small geometrical changes of the Co ions and the different ligand field strength of the two terminal ligands.
Keywords:cobalt  ligand field  magnetic anisotropy  phosphine oxide ligand  single-molecule magnets
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