Dinuclear gold(I) and silver(I) derivatives with bridging phosphines containing an imidazole ring; X-ray crystal structure of (1-benzyl-2-imidazolyl)diphenylphosphinegold(I)chloride
作者:Alfredo Burini、Bianca Rosa Pietroni、Rossana Galassi、Giovanni Valle、Sandro Calogero
DOI:10.1016/0020-1693(94)04258-w
日期:1995.2
(1-Benzyl-2-imidazolyl)diphenylphosphine [(BzIm)Ph(2)P] can act as a monodentate or bidentate ligand to afford mononuclear (BzIm)Ph(2)PAuCl (I) or dinuclear [mu-(BzIm)Ph(2)PAu](2+)(2)2X(-) (X = PF6-, BF4- or NO,-) (IIa,b,c) derivatives of gold(I). Analogous dinuclear silver(I) derivatives were obtained reacting the ligand [(BzIm)Ph(2)P] with AgX salts (X=NO3-, BF4-) (IIIa,b). In solution the silver complexes show a fluxional behaviour, and two conformers were observed by P-31 NMR spectroscopy. The structure of compound I was established by X-ray crystallography (monoclinic, space group C2/c, a = 18.068(2), b = 16.576(2), c = 15.391(2) Angstrom, beta = 117.2(2)degrees, Z = 8). The short intermolecular An Au distance of 3.03(2) Angstrom indicates a metal-metal interaction. The Au-197 Mossbauer parameters of compounds I and IIa are consistent with IR, NMR and crystallographic data.
(1-苄基-2-咪唑基)二苯基膦 [(BzIm)Ph(2)P] 可以作为单齿或多齿配体,生成单核 (BzIm)Ph(2)PAuCl (I) 或双核 [μ-(BzIm)Ph(2)PAu](2+)(2)2X(-) (X = PF6-, BF4- 或 NO3-) (IIa,b,c) 的金(I)配合物。类似的双核银(I)配合物通过将配体 [(BzIm)Ph(2)P] 与 AgX 盐 (X=NO3-, BF4-) 反应获得 (IIIa,b)。在溶液中,银配合物表现出流动行为,通过 P-31 NMR 光谱观察到了两种构象。化合物 I 的结构通过 X 射线衍射确定(单斜系,空间群 C2/c,a = 18.068(2), b = 16.576(2), c = 15.391(2) 埃,β = 117.2(2) 度,Z = 8)。分子间较短的 Au-Au 距离为 3.03(2) 埃,表明存在金属-金属相互作用。化合物 I 和 IIa 的 Au-197 穆斯堡尔参数与红外光谱、NMR 和晶体学数据一致。