Sonogashira coupling of a terminal alkyne with cycloplatinated ferrocenylamine complexes gave the acetylides Pt[RCC][Me2NCH2(σ-Fc)]dmso}, which were characterised by analysis, spectroscopy and, for the R = SiMe33, Fc 5 complexes, X-ray structural analyses. A butadiyne complex was also isolated in reactions of 3. Equivalent reactions with LDA led to an unusual deplatination reaction to give the ethynylferrocenylamine. The Pt(II) centre functions as a redox switch at E+/0 = ∼0.21 V and the spectroscopic and electrochemical data show that the acetylide is a π-donor ligand. There is a strict delineation of the electronic requirements for the trans Pt–N and trans Pt–C(Cp) groups in these cycloplatinated compounds. Oxidation of 3 gives rise to low energy bands based on the Pt(II) unit; an additional broad band at 1100 nm occurs in 5+ but not 52+.
末端炔与环
铂化的
铁酚胺配合物进行Sonogashira偶联,得到
乙炔化物Pt[RCC][Me2NCH2(σ-Fc)]dmso},该化合物通过分析、光谱学以及对于R = SiMe3和Fc 5复合物的X射线结构分析进行表征。在反应中也分离出了1,3-
丁二炔配合物。与
LDA的等效反应导致了一种不寻常的去
铂反应,生成了
乙炔基
铁酚胺。Pt(II)中心在E+/0 ≈ 0.21 V下作为氧化还原开关,光谱和电
化学数据表明
乙炔化物是π供体
配体。这些环
铂化化合物中,trans Pt–N和trans Pt–C(Cp)基团的电子需求有严格的区分。对3的氧化会产生基于Pt(II)单元的低能带;在5+中出现了一个额外的宽带,在1100 nm处,而在52+中则没有。