| Sumario: | A series of mononuclear, [+- cms-PtH(C=CR)(PPh3)2] (R = C5H4N-2 (1), (6-C=CH)C5H3N-2 (2), C6H4NH2-4 (3), (4-C=CH)C6H4 (4), (CH2)5C=CH (5)), and binuclear, [frans,*rans-(PPh3)2HR{/*-a:a-(CC)2R}PtH(PPh3)2] (R = C5H3N-2 (7), C6H4-1,4 (8)), hydride-alkynyl platinum complexes has been prepared in good to moderate yields from the reactions of [Jrans-PtHCl(PPh3)2] with an excess of the corresponding alkyne in the presence of an excess of NEt2H and from the reactions of Ura7is-PtHCl(PPh3)2] .with 1 equiv of 2 or 4 in the presence of diethylamine. An analogous reaction with HC=CCPh2OH leads to a mixture of [Jrans-PtH(C=CCPh2OH)(PPh3)2] (6a) and [Pt(7/2-HC=CCPh2OH)(PPh3)2] (6b). The binuclear diyne complex [{(PPh3)2Pt}2{/(-?;2:7;2-(C=CH)2C6H4-l,4}] (9), prepared in high yield from [Pt(?;2C2H4)(PPh3)2] and HC=CCeH4-l,4-C=CH (0.5 equiv), is also formed in the reaction leading .to 8. Complexes 5, 7, and 8 have been used as precursors to form the mixed-valence Pt(II)Pt(0) complexes 10-12. The spectroscopic characterization of the complexes and X-ray crystal structure determination of 1 and 6b are included. Their absorption and some selected emission spectra, examined on the basis of theoretical studies (EHMO), are also reported. © 2000 American Chemical Society.
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