New Molecular Niobium(IV) Complexes NbX4(OPPh3)2 (X = Cl, Br): Synthesis, Crystal and Electronic Structure
作者:P. A. Poltarak、V. Yu. Komarov、S. G. Kozlova、V. A. Nadolinnyi、A. A. Poltarak、S. B. Artemkina、V. E. Fedorov
DOI:10.1134/s0022476619030144
日期:2019.3
niobium(IV) complexes NbCl4(OPPh3)2(1) and NbBr4(OPPh3)2(2) are synthesized by heating respective niobium pentahalide with a mixture of triphenylphosphine and triphenylphosphine oxide. For the obtained compounds the crystal structure is solved: 1P-1, a = 13.3540(5) Å, b = 9.4461(3) Å, c = 9.5635(3) Å, α = 93.084(1)°, β = 121.263(1)°, γ = 115.058(1)°, Z = 1, R1 = 0.0194; 2P-1, a = 13.308(2) Å, b = 9.5934(8)
新的分子铌 (IV) 配合物 NbCl4(OPPh3)2(1) 和 NbBr4(OPPh3)2(2) 是通过将各自的五卤化铌与三苯基膦和三苯基氧化膦的混合物加热合成的。对于所得化合物,解出晶体结构:1P-1, a = 13.3540(5) Å, b = 9.4461(3) Å, c = 9.5635(3) Å, α = 93.084(1)°, β = 121.263( 1)°,γ = 115.058(1)°,Z = 1,R1 = 0.0194;2P-1, a = 13.308(2) Å, b = 9.5934(8) Å, c = 9.5556(9) Å, α = 93.975(3),°, β = 119.391(4)°, γ = 114.740(4) )°,Z = 1,R1 = 0.0184。未配对电子主要位于铌原子上,这得到了量子化学计算和 EPR 光谱结果的支持。