TR-FTIR absorption spectroscopy of transition metal carbonyl radicals generated by photodissociation of metal–metal bonds, by halogen abstraction or by radical ligand substitution
作者:Thiam Seong Chong、Peng Li、Weng Kee Leong、Wai Yip Fan
DOI:10.1016/j.jorganchem.2005.06.015
日期:2005.9
(TR-FTIR) absorption spectra of transition metal carbonyl radicals in hexane are reported here. For the first method, CpM(CO)2L and Cp*M(CO)2L (M = Mo, W; L = CO, PR3) radicals have been generated by photodissociation of the corresponding metal–metal bonded dimers. Radicals of formula M(CO)4L (M = Mn, Re; L = CO, PR3, AsPh3, SbPh3) and CpM(CO)n (M = Fe, Mo; n = 2, 3) have been produced via the second method
本文报道了三种获得时间分辨的己烷中过渡金属羰基自由基的傅里叶变换红外(TR-FTIR)吸收光谱的方法。对于第一种方法,CpM(CO)2 L和Cp * M(CO)2 L(M = Mo,W; L = CO,PR 3)自由基是通过相应的金属-金属键合二聚体的光解而生成的。式M(CO)4 L(M = Mn,Re; L = CO,PR 3,AsPh 3,SbPh 3)和CpM(CO)n(M = Fe,Mo; n = 2,3)的基通过第二种方法生产,该方法是使用CpMo(CO)3卤素过渡金属羰基卤化物激进的。对于第三种方法,已经开发了快速自由基配体取代动力学,可以在存在游离膦的情况下从CpMo(CO)3生成CpMo(CO)2 PR 3自由基。还讨论了有关TR-FTIR光谱检测自由基的三种方法的评估。