Abstract
Новые молекулярные комплексы ниобия(IV) NbCl4(OPPh3)2 (1) и NbBr4(OPPh3)2 (2) получены нагреванием соответствующего пентагалогенида ниобия со смесью трифенилфосфина и трифенилфосфин оксида. Для полученных соединений решена кристаллическая структура (1: P-1, a = 13.3540(5), b = 9.4461(3), c = 9.5635(3) Å, α = 93.084(1), β = 121.263(1), γ = 115.058(1)°, Z = 1, R1 = 0.0194; 2: P-1 a = 13.308(2), b = 9.5934(8), c = 9.5556(9) Å, α = 93.975(3), β = 119.391(4), γ = 114.740(4)°, Z = 1, R1 = 0.0184). Неспаренный электрон локализован преимущественно на атоме ниобия, что подтверждается квантово-химическими расчетами и результатами ЭПР спектроскопии.
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