and accordingly the complexes were studied by electrochemistry and UV/vis/NIR, IR, and EPR spectroscopy in their accessible oxidation states. Oxidation of 1 to [1](+) generates a ligand-centered semiquinone radical with some metal character as shown by the IR and EPR spectra. Dinuclear complexes [2](+) and 3 show two reversible ligand-centered couples (one associated with each dioxolene terminus) which
单核络合物[Ru(PPh(3))(2)(CO)(2)(L(1))](1; H(2)L(1)= 7,8-二羟基-6-甲氧基
香豆素)和双核络合物[[Ru(PPh(3))(2)(CO)(2)](2)(L(2))] [PF(6)] [[2] [PF(6)];H(3)L(2)= 9-苯基-2,3,7-三羟基-6-
芴]和[[Ru(PBu(3))(2)(CO)(2)](2)(L (3))](3; H(4)L(3)= 1,2,3,5,6,7-六羟基
蒽-9,10-二酮);所有配合物均包含一个或两个反式,顺-[Ru(PR(3))(2)(CO)(2)]单元,每个单元均与螯合二氧
戊烯型
配体连接。在所有情况下,二氧
戊烯配体均表现出可逆的氧化还原活性,因此通过电
化学和UV / vis / NIR,IR和EPR光谱研究了络合物的可氧化态。将1氧化为[1](+)会生成以
配体为中心的半醌自由基,该自由基具有某些
金属特性,如