diamagnetic and also that the complexes maintain their integrity in solution. UV-vis spectra of the green solutions have been interpreted in terms of ligand-field and charge-transfer bands. The electrochemical behavior of the complexes studied by cyclic and differential pulse voltammetric techniques indicates that the [(CoIII)4(mu3-O)4]4+ core present in the complexes undergoes a reversible one-electron
通式为Co4O4(O2CMe)4L4(1)的橄榄绿色
钴(III)配合物,其中L = py(1a),4-Mepy(1b),4-Etpy(1c)和4-CNpy(1d)具有通过在
甲醇中以1:2:1的摩尔比将Co2 +,MeCO2-和
吡啶或4-取代的
吡啶的混合物进行
H2O2氧化制备。光谱和X射线晶体学研究表明,这些络合物包含四聚体类古巴核[Co4(mu3-O)4] 4+,其中四个
钴原子形成近似四面体,边长约为2.75A。 1a.NaClO4.3.5H2O和1b.3H2O中Co4(mu3-O)4(mu-O2CMe)4L4的晶体学确定结构为六坐标。复合物的红外光谱显示出由于中央古巴样核而在700、635和580 cm-1附近出现的特征谱带。配合物的1 H NMR光谱表明,溶解的物质基本上是反磁性的,而且配合物在溶液中保持其完整性。绿色溶液的紫外可见光谱已根据
配体场和电荷转移带进行了解释。通过循环和差分