Coordination of molecular nitrogen and hydrogen to (.eta.6-C6H6)Cr(CO)x and (.eta.5-C5H5)Mn(CO)x (x = 2 and 1) in the gas phase
作者:Youfeng Zheng、Wenhua Wang、Jingu Lin、Yongbo She、Kejian Fu
DOI:10.1021/j100203a045
日期:1992.11
Time-resolved infrared absorption spectroscopy is used to study the coordination reactions of N2 and H-2 with photolytically generated coordinatively unsaturated species (eta6-C6H6)Cr(CO)x and (eta5-C5H5)Mn(CO)x (x = 2 and 1) in the gas phase. Additions of N2 and H-2 to (eta6-C6H6)Cr(CO)2 and (eta5-C5H5)Mn(CO)2 form corresponding molecular nitrogen and hydrogen complexes. Additions of N2 and H-2 to (eta6-C6H6)Cr(CO) are confirmed although no product absorption is observed. By comparison, reactions of N2 and H-2 with (eta5-C5H5)Mn(CO) are not observed, presumably due to spectral overlap. The rate constants for reactions of N2 and H-2 With (eta6-C6H6)Cr(CO)2 and (eta5-C5H5)Mn(CO)2 as well as with (eta6-C6H6)Cr(CO) are measured, and an upper limit for the rate constants for reactions of N2 and H-2 with (eta5-C5H5)Mn(CO) is estimated. Significant differences are observed for the rate constants for reactions of different species and discussed with respect to spin-allowed versus disallowed processes.