Preparation and fluxional behaviour of 4-substituted 2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane hydride complexes of the cobalt triad
作者:Eileen M. Hyde、J. Richard Swain、John G. Verkade、Paul Meakin
DOI:10.1039/dt9760001169
日期:——
Caged phosphite complexes of the type [MHP(OCH2)CPrn}4](M = Co, Rh, or Ir) have been synthesized. These complexes are stereochemically non-rigid on the n.m.r. time scale at 25 °C. However, for the rhodium and iridium analogues, near-limiting and limiting slow-exchange spectra respectively, corresponding to a structure with C3v, symmetry, have been obtained at low temperatures. Activation parameters
已合成[MH P(OCH 2)CPr n } 4 ](M = Co,Rh或Ir)的笼状亚磷酸酯络合物。这些配合物在25°C的nmr时间尺度上在立体化学上是非刚性的。然而,对于铑和铱类似物,已经在低温下获得了分别对应于具有对称对称的C 3 v结构的近极限和极限慢交换光谱。激活参数已通过线形分析计算得出。[M(CO)H(PPh 3)2 P(OCH 2)3 CX}]类型的混合配体络合物(M = Rh或Ir; X = Pr n或NO 2)和[M(CO)H (PPh还已经制备了3)P(OCH 2) 3 CX} 2 ](X = Pr n,Ph或NO 2)。对于后者的复合物,核磁共振证据表明涉及两个以上的异构体。