Steric and electronic properties in bicyclic phosphines. Crystal and molecular structures of Se=Phoban-Q (Q=C2, C3Ph, Cy and Ph)
作者:Peter N. Bungu、Stefanus Otto
DOI:10.1016/j.jorganchem.2007.04.001
日期:2007.7
significantly more electron rich. The crystal structures of Se = Phoban[3.3.1]-Q (Q = CH2CH3, C3H6Ph, Cy, and Ph) and Se = Phoban[4.2.1]-Q (Q = Cy and Ph) are reported and reveal PSe bond distances ranging from 2.1090(9) to 2.1245(7) Å. For Q = Cy and Ph the two isomers ([3.3.1] and [4.2.1]) co-crystallise in the same crystal enabling the determination of the molecular structures for both from the same data
使一系列双环Phoban-Q(9-Q-9-磷杂双环[3.3.1]壬烷和9-Q-9-磷杂双环[4.2.1]壬烷)衍生物(Q =烷基,环烷基,芳基)与KSeCN导致形成相应的膦硒化物。一阶磷-硒偶合常数1 J P-Se对于[3.3.1]异构体为682至689 Hz,对于[4.2.1]异构体为703至717 Hz,表明前者明显更大。电子丰富。Se = Phoban [3.3.1] -Q(Q = CH 2 CH 3,C 3 H 6据报道有Ph,Cy和Ph)和Se = Phoban [4.2.1] -Q(Q = Cy和Ph),揭示了PSe键的距离范围为2.1090(9)至2.1245(7)。对于Q = Cy和Ph,两个异构体([3.3.1]和[4.2.1])在同一晶体中共结晶,从而可以从同一数据收集中确定两种分子的分子结构。根据Tolman模型确定了所有配体衍生物的锥角,但使用了实际的P-Se键距,