Quinoline-based, tetradentate nitrogen ligands, N,N′-bis(2-quinolylmethyl)-N,N′-dialkyl-1,2-ethanediamine (alkyl = methyl, bqdmen; ethyl, bqdeen; isopropyl, bqdpen), have been investigated as the supporting ligands for the formation of bis(µ-oxo) dinuclear manganese complexes. Bis(µ-oxo)Mn2(III,III) complexes 1 and 2 were obtained for bqdmen and bqdeen, respectively, as evidenced by X-ray crystallography, whereas bqdpen did not afford any manganese complexes due to its steric bulk. Complexes 1 and 2 exhibit highly positive Mn2(III,III)/Mn2(III,IV) and Mn2(III,IV)/Mn2(IV,IV) redox couples relative to the corresponding pyridine-ligated (µ-O)2Mn2(III,III) complexes.
研究了基于
喹啉的四价氮
配体 N,N′-双(2-
喹啉甲基)-N,N′-二烷基-1,2-
乙二胺(烷基 = 甲基,bqdmen;乙基,bqdeen;异丙基,bqdpen),作为形成双(µ-氧代)双核
锰络合物的支持
配体。X 射线晶体学证明,bqdmen 和 bqdeen 分别得到了双(µ-氧代)Mn2(III,III)配合物 1 和 2,而 bqdpen 则由于其立体体积而没有得到任何
锰配合物。相对于相应的
吡啶配位 (µ-O)2Mn2(III,III) 复合物,复合物 1 和 2 表现出高度正的 Mn2(III,III)/Mn2(III,IV) 和 Mn2(III,IV)/Mn2(IV,IV) 氧化还原偶合。