Journal of the Chemical Society, Dalton Transactions p. 4099 - 4107 (1996)
Update date:2022-08-05
Topics:
Genge, Anthony R. J.
Gibson, Alexander M.
Guymer, Naomi K.
Reid, Gillian
Reaction of [Cu(MeCN)4]PF6 or AgBF4 with 1 molar equivalent of Ph2P(E)(CH2)2SZS(CH2) 2(E)PPh2 [Z = (CH2)2, E = S (L1b) or Se (L1c); Z = (CH2)3, E = none (L2a), S (L2b) or Se (L2c); Z = o-C6H4, E = none (L3a), S (L3b) or Se (L3c)] in degassed acetone followed by addition of diethyl ether yielded the mononuclear complexes [ML]X (M = Cu, X- = PF6-; M = Ag, X- = BF4-) in high yield. The gold(I) species [AuL]PF6 were obtained by reaction of L (= L1b, L1c, L2b, L2c or L3a-L3c) with 1 molar equivalent of [AuCl(tht)] (tht = tetrahydrothiophene) and TlPF6. All of these products have been characterised by 1H, 31P-{1H} (and in some cases 77Se-{1H} and 109Ag) NMR and IR spectroscopy, FAB or electrospray mass spectrometry and microanalyses. The data indicate four-co-ordination for all of the copper(I) and silver(I) species and this assignment has been confirmed by single-crystal structure determinations on three copper(I) examples. Spectroscopic studies on [AuL]PF6 indicated linear two-co-ordination on average, via the phosphine, phosphine sulfide or phosphine selenide functions as appropriate. Variable-temperature 31P-{1H} (and 77Se-{1H}) studies showed that the chalcogenide complexes are considerably more labile in solution than the phosphathia ligand complexes. Crystal structure determinations on [CuL3a]+, [CuL1c]+, [AgL1c]+ and [CuL2b]+ each showed the metal ion co-ordinated to all four donor atoms of a single ligand in the solid state, giving an overall distorted-tetrahedral stereochemistry. In the case of [CuL1c]+ there is a slight lengthening of the P-Se bond length compared to that of the unco-ordinated form of L3c. Syntheses for the new pro-ligands are also detailed.
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