New dinuclear platinum(I) complex obtained from thermal degradation of platinum(>0>)–triphenylphosphine complexes
Abstract
Thermolysis of [Pt(PPh3)2(C2H4)], [Pt(PPh3)3] or of various complexes of the type [Pt(PPh3)2(alkyne)] in toluene gave the dinuclear platinum(I) complex [(Ph3P)Pt{µ-C6H4(PPh2)-2}(µ-PPh2)Pt(PPh3)] in ca. 60% yield as a consequence of both C–H and P–Ph cleavage of co-ordinated triphenylphosphine. The complex, which has been identified by mass spectrometry, NMR (31P, 195Pt) spectroscopy and single-crystal X-ray diffraction analysis, is probably identical with some of the compounds formulated in the literature either as [Pt2(PPh3)4] or [Pt2(µ-PPh2)2{C6H4(PPh2)-2}2]. The other product of the reaction is the known trinuclear compound [Pt3(µ-PPh2)3(Ph)(PPh3)2].