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].