electronic structures of these complexes, particularly with respect to the covalent character of the O–Ru–O fragment. In addition, the photochemical isomerization of cis-[RuII(bpy)2(H2O)2]2+ to its trans-[RuII(bpy)2(H2O)2]2+ isomer has been fully characterized through quantum chemical calculations. The excited-state process is predicted to involve decoordination of one aqua ligand, which leads to a coordinatively
通过UV-vis,EPR,XAS和UV-vis研究了顺式-[Ru II(bpy)2(H 2 O)2 ] 2+的几何结构和电子结构以及直至Ru VI的形式的较高氧化态物种。DFT和CASSCF / CA
SPT2计算。这些物种的分子结构的DFT计算表明,随着氧化态的增加,Ru-O键的距离减小,表明Ru-O多重键的程度增加。另外,O-Ru-O价键角随氧化态的增加而增加。EPR光谱和量子
化学计算表明,低自旋构型适用于所有氧化态。因此,顺式-[RuIV(bpy)2(OH)2 ] 2+(d 4)具有单线基态,并且在低温下是EPR沉默的,而cis- [Ru V(bpy)2(O)(OH)] 2+( d 3)具有双重态基态。较高氧化态物质的XAS光谱和DFT计算进一步阐明了这些络合物的电子结构,特别是关于O–Ru–O片段的共价特征。此外,顺式-[Ru II(bpy)2(H 2 O)2 ] 2+的光
化学异构化其反式-