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Phosphine Oxide Ligand Based Tetrahedral Co II Complexes with Field‐induced Slow Magnetic Relaxation Behavior Modified by Terminal Ligands
Author(s) -
Yang RuiChong,
Wang DanRu,
Liu JunLiang,
Wang YuFei,
Lin WeiQuan,
Leng JiDong,
Zhou AiJu
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201900280
Subject(s) - isostructural , crystallography , chemistry , ligand (biochemistry) , ab initio , relaxation (psychology) , denticity , ab initio quantum chemistry methods , phosphine , ligand field theory , magnetic field , phosphine oxide , ion , molecule , crystal structure , physics , psychology , social psychology , biochemistry , receptor , organic chemistry , quantum mechanics , catalysis
Two isostructural mononuclear Co II 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.