The photoinduced electron transfer interaction between a luminescent metal-ligand probe, [Ru(dmbpy)₃]²⁺ and quinones have been investigated by absorption and fluorescence spectroscopy. The reactions of quinones with the excited state ruthenium(II) complex in DMF have been studied by luminescence quenching technique and the bimolecular quenching rate constant k_q values are found close to the diffusion controlled rate. The complex has an absorption maximum of 458 nm. It shows a photoluminescence at 608 nm. The lifetime of the complex in DMF is 164 ns. The ground state absorption measurements are used to confirm the nature of quenching. Transient absorption spectral measurements are performed and the oxidative nature of quenching is confirmed. The detection of semiquinone anion radical using time resolved transient absorption spectroscopy and the linear variation of log k_q vs reduction potential of the quinones confirms the electron transfer nature of the reaction.

中文翻译：

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非质子极性介质中三（4,4ʹ-二甲基-2,2ʹ-联吡啶基）钌（II）配合物与醌的荧光猝灭

通过吸收和荧光光谱研究了发光金属-配体探针[Ru（dmbpy）₃ ] ²⁺和醌之间的光诱导电子转移相互作用。通过发光猝灭技术和双分子猝灭速率常数k _q研究了醌与DMF中激发态钌（II）配合物的反应。发现值接近于扩散控制速率。该络合物的最大吸收为458nm。它显示了在608 nm处的光致发光。该复合物在DMF中的寿命为164 ns。基态吸收测量用于确认淬灭的性质。进行瞬态吸收光谱测量并确定淬灭的氧化性质。使用时间分辨瞬态吸收光谱法检测半醌阴离子自由基，log k _q 对醌还原电位的线性变化 证实了反应的电子转移性质。