Hydride transfer to transition-metal carbonyls in the gas phase. Formation and relative stabilities of anionic formyl complexes
作者:Kelley R. Lane、Robert R. Squires
DOI:10.1016/s0277-5387(00)81786-6
日期:1988.1
of Fe(CO) 5 , Cr(CO) 6 , Mo(CO) 6 and W(CO) 6 ( HA (M(CO) n ) = D[(CO) n − MCOH − ]) have been estimated from bimolecular hydride transfer reactions in the gas phase. Hydride transfer to the metal carbonyls yields the corresponding anionic formyl complexes and the hydride affinity bracketing experiments establish HA (Fe(CO) 5 ) = 56±4 kcal mol −1 and HA (Cr(CO) 6 ) = HA (Mo(CO) 6 ) = HA (W(CO) 6 )
摘要Fe(CO)5,Cr(CO)6,Mo(CO)6和W(CO)6(HA(M(CO)n)= D [(CO)n-MCOH- ])是根据气相中的双分子氢化物转移反应估算的。氢化物转移到羰基金属上产生相应的阴离子甲酰基络合物,氢化物亲和力包围实验建立HA(Fe(CO)5)= 56±4 kcal mol -1和HA(Cr(CO)6)= HA(Mo(CO )6)= HA(W(CO)6)= 44±4 kcal mol -1。金属甲酰基阴离子的气相形成热和金属-碳键强度来自氢化物结合能。金属羰基化合物的氢化物亲和力排序与它们对溶液中亲核加成反应的相对反应性平行,并且与它们的CO拉伸力常数的相对大小(k co)相关。