Ultrafast, reversible intersystem crossing (ISC) is reported under ambient conditions for the electronic ground state of the pentacoordinate cobalt nitrosyl complexes, [CoX2(NO)(PMePh2)2] (X=Cl, Br), in solution. ISCs on such short timescales are more typically observed in electronically excited states reached by absorption of ultraviolet or visible light. Singlet and triplet electron spin states of
据报道,在环境条件下,五配位
钴亚
硝酰基
钴[CoX 2(NO)(
PMePh 2)2在溶液中](X = Cl,Br)。在如此短的时间尺度上,ISC通常在通过吸收紫外线或可见光而达到的电子激发态下观察到。对应于两种不同异构体的配合物的单重态和三重态电子自旋态在室温下分布,并且两种异构体在几皮秒的时间尺度上进行交换。超快速二维红外光谱法观察了(旋转)绝热地面势能表面上伴随异构化和相关ISC的NO
配体带的波数变化。
氯络合物和
溴络合物动力学的比较表明,
配体运动的惯性效应比自旋-轨道耦合对确定正向和反向异构化和ISC速率的影响更大。