Structural and Magnetic Studies of Copper(II) and Zinc(II) Coordination Complexes Containing Nitroxide Radicals as Chelating Ligands
作者:Akihiro Ito、Yoshiaki Nakano、Masashi Urabe、Kazuyoshi Tanaka、Motoo Shiro
DOI:10.1002/ejic.200600085
日期:2006.9
synthesized doxyl nitroxide ligands 4,4-di-methyl-2,2-di(2-pyridyl)oxazolidine-N-oxyl (1) and 4,4-di-methyl-2,2-bis[2-(3-methylpyridyl)]oxazolidine-N-oxyl (2) and M(CF 3 SO 3 ) 2 (M = Cu II or Zn II ). These metal-nitroxide complexes have been structurally and magnetically characterized. In all complexes, the four pyridyl groups coordinate in equatorial coordination sites and the two nitroxide groups in axial
单核过渡金属络合物[Cu(CF 3 SO 3 ) 2 1 2 ] (la), [Zn(CF 3 SO 3 ) 2 1 2 ] (1b), [Cu(CF 3 SO 3 ) 2 2 2 ]· 2CH 3 CN (2a) 和[Zn(CF 3 SO 3 ) 2 2 2 ]·2CH 3 CN (2b) 已由新合成的氮氧自由基配位体 4,4-di-methyl-2,2-di 制备(2-吡啶基)恶唑烷-N-氧基(1)和4,4-二甲基-2,2-双[2-(3-甲基吡啶基)]恶唑烷-N-氧基(2)和M(CF 3 SO) 3 ) 2 (M = Cu II 或 Zn II )。这些金属-氮氧化物配合物已经在结构和磁性上进行了表征。在所有配合物中,四个吡啶基在赤道配位点配位,两个氮氧基在轴向配位点配位,这意味着中心金属离子获得扭曲的 N 4 O 2 八面体构型。变温磁化率数据表明配合物1b和2b表现出顺磁性,因此可以估计出非常弱的配体内磁相互作用