Phosphorus–phosphorus coupling constants in trifluoromethylphosphine group VI<sub>A</sub>metal complexes
作者:J. F. Nixon、J. R. Swain
DOI:10.1039/dt9720001038
日期:——
Phosphorus–phosphorus coupling constants, 2J(PP′), have been evaluated from 19F (and in certain cases 1H and 31P) n.m.r. spectra of cis-L2M(CO)4 complexes [L =(CF3)2PR or CF3PQ2; M = Cr, Q = H; M = Mo, Q = Cl, Br, H; R = Cl, Br, I, H]. The data, together with published values for the (CF3)2PF and CF3PF2 complexes, indicate that the magnitude of 2J(PP′) for the molybdenum series decreases in the order
磷-磷偶合常数2 J(PP')已通过顺式-L 2 M(CO)4配合物的19 F(在某些情况下为1 H和31 P)nmr光谱评估[L =(CF 3)2 PR或CF 3 PQ 2 ; M = Cr,Q = H;M = Mo,Q = Cl,Br,H;R = Cl,Br,I,H]。数据以及(CF 3)2 PF和CF 3 PF 2配合物的公布值表明,2 J的量级钼系列的(PP')以R = F> Cl> Br> l> H和Q = F> Cl〜Br H的顺序降低。CF 3 PH 2配合物的值异常小。配合物的顺式- [(CF 3)2 PNMe 2 ] 2的Mo(CO)4和顺- [(CF 3)2个PNCS] 2的Mo(CO)4被描述和溶液NMR数据表明,分子间膦交换正在发生。