Improved synthesis of (η5-CpR)M(CO)4 compounds and the Nujol matrix photochemistry of (η5-C5H5)M(CO)4 and (η5-C9H7)M(CO)4, where M=Nb and Ta
作者:Thomas E Bitterwolf、Skip Gallagher、J.Timothy Bays、Bruce Scallorn、Arnold L Rheingold、Ilia A Guzei、Louise Liable-Sands、John C Linehan
DOI:10.1016/s0022-328x(97)00735-3
日期:1998.4
Improved preparative routes for cyclopentadienyl (Cp) and substituted Cp(CO)4 derivatives of niobium and tantalum and their precursors are described. New compounds are fully characterized by IR, NMR, and elemental analysis. The molecular structures of five compounds were determined: (vinylCp)Nb(CO)4: triclinic, Pı̄, a=6.770(1) Å, b=6.937(1) Å, c=12.706(2) Å, α=90.42(1)°, β=91.07(1)°, γ=105.560(8)°
描述了铌和钽的环戊二烯基(Cp)和取代的Cp(CO)4衍生物及其前体的改进制备路线。新化合物通过IR,NMR和元素分析得到充分表征。测定的五种化合物的分子结构:(vinylCp)NB(CO)4:三斜晶系,P I,一个= 6.770(1)埃,b = 6.937(1)埃,c ^ = 12.706(2)埃,α = 90.42 (1)°,β = 91.07(1)°,γ = 105.560(8)°,V = 574.71(12)一种3,ž = 2,- [R (˚F)= 2.82; (乙酰基Cp)Nb(CO)4:单斜晶系,P 2 1 / ç,一个= 10.316(2)埃,b = 14.490(3)埃,c ^ = 7.957(3)埃,β = 94.68(2)°,V = 1185.4(4)3,Z = 4,R(F)= 2.58;(CP)的Ta(CO)4:斜方晶系,晶Pnma,一个= 7.756(1)埃,b =