作者:Peiyi Li、Birte Ahrens、Andrew D. Bond、John E. Davies、Olivia F. Koentjoro、Paul R. Raithby、Simon J. Teat
DOI:10.1039/b716664h
日期:——
A series of novel digold complexes incorporating ethynyl pyridine derivatives as a spacer unit, [(R3P)Au(CC)X(CC)Au(PR3)] (R = Ph, X = 2,5-pyridine (1); R = Cy (cyclohexane), X = 2,5-pyridine (2); R = Ph, X = 2,6-pyridine (3); R = Ph, X = 2,5′-bipyridine (4); R = Ph, X = 2,6′-bipyridine (5)), has been synthesised. All the complexes have been characterised spectroscopically and the structures determined by single-crystal X-ray crystallography. The central (CC)(X)(CC) unit is essentially linear for complexes 1, 2 and 4 and kinked for complexes 3 and 5, but only in 1, with the shortest spacer group and the less bulky phosphine ligand, is there evidence of d10⋯d10Au⋯Au interactions (Au–Au 3.351(2) Å). The solution UV/visible absorption and emission spectra for all the complexes are similar to those of the free ligands suggesting that the spectra are dominated by π–π* ligand-centred transitions and this is confirmed by DFT calculations.
一系列以乙炔基吡啶衍生物为间隔单元的新型二金配合物[(R3P)Au(CC)X(CC)Au(PR3)](R = Ph,X = 2,5-吡啶 (1);R=Cy(环己烷),X=2,5-吡啶 (2);R=Ph,X=2,6-吡啶 (3);R=Ph,X=2,5′-联吡啶 (4);R=Ph,X=2,6′-联吡啶 (5))。所有复合物都经过光谱分析,并通过单晶 X 射线晶体学确定了结构。(CC)(X)(CC)中心单元在复合物 1、2 和 4 中基本上是线性的,而在复合物 3 和 5 中则是扭结的,但只有在具有最短间隔基和体积较小的膦配体的 1 中,才有证据表明存在 d10⋯d10Au⋯Au 相互作用(Au-Au 3.351(2) Å)。所有配合物的溶液紫外/可见吸收光谱和发射光谱都与游离配体的相似,这表明光谱主要是以π-π*配体为中心的跃迁,DFT 计算也证实了这一点。