Modulation of Magnetic Anisotropy and Exchange Interaction in Phenoxide-Bridged Dinuclear Co(II) Complexes
作者:Ajit Kumar Kharwar、Arpan Mondal、Arup Sarkar、Gopalan Rajaraman、Sanjit Konar
DOI:10.1021/acs.inorgchem.1c00956
日期:2021.8.16
trigonal-prismatic Co(II) center possesses a consistently large negative axial zero-field splitting (negative D) parameter (∼−60 cm–1), while the four-coordinate or the pseudo-tetrahedral Co(II) center exhibits a range of D values from +13 to −23 cm–1. Ab initio calculations employing the lines model were used to estimate the magnetic exchange as both the Co(II) centers possess significant magnetic anisotropy
我们报告了一类新的四种二聚 Co(II) 复合物 [Co 2 (bbpen)(X) 2 ] (H 2 bbpen = N , N ' -bis (2-hydroxybenzyl)- N , N '-bis(2-甲基吡啶基)乙二胺) [X – = SCN ( 1 ), Cl ( 2 ), Br ( 3 ), and I ( 4)] 具有两个 Co(II) 中心(三角棱柱和伪四面体)的不同配位几何形状及其磁学研究。有趣的是,两个 Co(II) 中心显示出两种不同类型的磁各向异性。最先进的 ab initio CASSCF 分析表明,六坐标或三角棱镜 Co(II) 中心具有始终如一的大负轴向零场分裂(负D)参数(~-60 cm –1),而四坐标或伪四面体 Co(II) 中心的D值范围从 +13 到 -23 cm –1. 由于 Co(II) 中心都具有显着的磁各向异性,因此使用线模型从头计算来估计