Photochemical <i>cis</i><i>−</i><i>trans</i> Isomerization of <i>cis</i>-(η<sup>6</sup>-1,2-Diphenylethene)Cr(CO)<sub>3</sub> and the Molecular Structure of <i>trans</i>-(η<sup>6</sup>-1,2-Diphenylethene)Cr(CO)<sub>3</sub>
作者:Anthony Coleman、Sylvia M. Draper、Conor Long、Mary T. Pryce
DOI:10.1021/om060773h
日期:2007.8.1
the trans isomer as confirmed by NMR, room-temperature UV−vis spectroscopy, and low-temperature matrix isolation studies. Laser flash photolysis of trans-(η6-1,2-diphenylethene)Cr(CO)3 at 355 nm forms a solvated dicarbonyl species, (η6-1,2-diphenylethene)Cr(CO)2. Matrix isolation studies confirm that cis to trans isomerization occurs under low-energy irradiation (λexc > 400 nm), while photolysis with
的可见光照射顺式- (η 6 -1,2-二苯基乙烯)的Cr(CO)3次的结果以有效转化为反式异构体,经NMR确认,室温下的UV-vis光谱,和低温基质隔离研究。的激光闪光光解反式- (η 6 -1,2-二苯基乙烯)的Cr(CO)3在355nm形成溶剂化的二羰基物种,(η 6 -1,2-二苯基乙烯)的Cr(CO)2。基质隔离研究证实,顺式到反式异构化的低能量照射下发生(λ EXC > 400纳米),而光解与λ EXC= 313 nm是诱导CO损失所必需的。时间依赖密度泛函理论(TDDFT)计算预测依赖于波长的光化顺向反式异构化的低能量(λ EXC > 400nm)的照射,而高能量辐射(λ EXC > 300纳米)填充激发态是不稳定的导致CO损失。