Synthesis and Crystal Structure of (ArO)2Sm-(OPPh3)(μ-OH)2(ArO = 2,6-tBu-4-Me-C6H2O)

摘要

The title complex, [(ArO)2Sm(OPPh3)(μ-OH)]2 (ArO = 2,6-tBu2-4-Me-C6H2O),was obtained by the hydrolysis reaction of divalent samarium aryloxide, Sm(ArO)2(THF)4, in the presence of triphenylphosphine oxide (OPPh3) in toluene. Crystal data: C96H124O8P2Sm2, Mr =1768.77, monoclinic, space group P21, a = 15.276(6), b = 19.406(9), c = 19.320(7) A, β =108.59(2)°, V = 5428(3) A3, Z = 2, Dc = 1.081 g/cm3, F(000) = 1836, T = 293 K, λ(MoKα) =0.71069 A andμ = 11.47 cm-1. The final R = 0.072 and wR = 0.092 for 2456 observed reflections with Ⅰ＞ 3σ(Ⅰ). The molecule has a dimeric structure with two cetrosymmetric hydroxyl bridges.The samarium atom is coordinated by five oxygen atoms to form a distorted square-pyramid geometry with the average Sm-O(Ar) distance of 2.18 A.