pair for 3c. The reaction of 3 with [(THF)W(CO)5] leads to the binuclear CuW complex 4 and the trinuclear W2Cu complex 5 with σ-phosphorus-coordinated W(CO)5 moieties. 5 bears an additional η5-π coordinated W(CO)3 unit and a unique W−Cu−P bridge, as established by X-ray crystallography. Both complexes are fluxional in solution, and the activation barriers of their rearrangement processes have been established
[(3,5-二叔丁基-1,2,4-三
磷酰基)Cu(PPh 3)](3)与相关的二聚配合物[(3,5-二叔丁基- 1,2,4-三
磷酰基)Cu(PMe 3)2 ] 2,单体且在溶液中具有高流动性。3由相应的三甲基甲1,2,4- triphosphole合成1A和[ClCu(PPH 3)] 4。可以通过动态31 P NMR光谱获得溶液中不同分子结构之间的三边重排过程的证据。一个η 5 -π协调模式(3a中在室温下,优选
铜离子的1)。平衡转移到2光谱可区别的,但几乎等能,σ络合物图3b和3c中在低温下,其与活化屏障Δ互换ģ ⧧ = 37千焦/摩尔。在3b的情况下,三
磷酰基
配体的σ供体轨道被认为是sp 3杂化P轨道,而对于3c,它是sp 2 P孤对。的反应3与[(THF)W(CO)5 ]导致的双核配合物的CuW 4和三核w ^ 2
铜络合物5具有σ-
磷配位的W(CO)5部分。5带有一个附加η 5 -π