Au–O Interactions and others in triphenylphosphinegold(i) sulfanylpropenoates with diverse structures

Abstract

We investigated the reactions of triphenylphosphinegold(I) chloride in ethanol or methanol with the 3-(2-aryl)-2-sulfanylpropenoic acids H₂xspa [x = f, t, p; f = 3-(2-furyl)-, t = 3-(2-thienyl)-, p = 3-phenyl-; spa = 2-sulfanylpropenoato] in 1 ∶ 1 and 2 ∶ 1 mole ratios, and the reactions of diisopropylamine with the 1 ∶ 1 complexes. Compounds of types [Au(PPh₃)(Hxspa)], [HQ][Au(PPh₃)(xspa)] (HQ = diisopropylammonium) and [(AuPPh₃)₂(xspa)] were isolated and characterized by IR, Raman and FAB mass spectrometry and by ¹H, ¹³C and ³¹P NMR spectroscopy. The structures of (Htspa)₂·Me₂CO and of the complexes [Au(PPh₃)(Hfspa)] (1), [HQ][Au(PPh₃)(pspa)] (6), [(AuPPh₃)₂(fspa)] (7), [(AuPPh₃)₂(tspa)]·2MeOH (8·2MeOH) and [(AuPPh₃)₂pspa]·2MeOH (9·2MeOH) were determined by X-ray diffractometry; those of the Au complexes exhibit π-stacking, hydrogen bonding and Au–Au and Au–O interactions as well as the expected Au–S and Au–P bonds.