Large oligomers of [Au(CN)₂^–]_n including the pentamer were favorably formed in an aqueous solution containing tetra-ethylammonium chloride (1.0 mol/dm³), and intense transient absorption in the visible region was recorded by selective photoexcitation of the oligomers. Distinct oscillations at ∼40–100 cm^–1 were clearly observed in the temporal profile of the excited-state absorption signal, and the frequency–wavelength two-dimensional analysis of the oscillation clearly distinguishes the coherent nuclear motion of different oligomers. The observed nuclear motions were assigned to Au–Au stretch vibrations in the trimer, tetramer, and pentamer induced by the bond formation in the excited states. The transient absorption exhibits significant changes with a time constant of 3–20 ps, reflecting intersystem crossing and structural change.

中文翻译：

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通过相干核波包运动识别的水中[Au（CN）₂ ^– ] _n（n = 3–5）低聚物中的金属-金属键形成

的大的低聚物[金（CN）₂ ^- ] _Ñ包括五聚体中良好地形成在水溶液中含有氯化四乙基铵（1.0摩尔/分米³在可见光区），和强烈瞬态吸收记录通过的选择性光激发低聚物。在〜40–100 cm ^–1处出现明显的振荡在激发态吸收信号的时间分布中可以清楚地观察到，并且对振荡的频率-波长二维分析清楚地区分了不同低聚物的相干核运动。观察到的核运动被归因于三态，四聚体和五聚体在激发态形成键引起的Au-Au拉伸振动。瞬态吸收表现出显着的变化，时间常数为3–20 ps，反映了系统间的交叉和结构变化。