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采用时间分辩激光光谱技术,研究了一种钌配合物[Ru(dmb)2(mitatp)]2+发光增强的超快过程。采用比较方法测量了[Ru(dmb)2(mitatp)]2+和[Ru(dmb)2(mitatp)]2+/DNA复合物的瞬态发光弛豫过程。[Ru(dmb)2(mitatp)]2+和[Ru(dmb)2(mitatp)]2+/DNA复合物的发光均来源于[Ru(dmb)2(mitatp)]2+中的电荷转移单态和三重态到基态的辐射跃迁。通过钌配合物与DNA的相互作用,[Ru(dmb)2(mitatp)]2+的荧光寿命由339 ns延长至589 ns;磷光寿命由16μs延长至21μs,总的发光强度增强了约1个数量级。分析表明,[Ru(dmb)2(mitatp)]2+发光寿命和发光强度的增加可能来源于[Ru(dmb)2(mitatp)]2+与DNA之间的电荷转移态的形成,它导致[Ru(dmb)2(mitatp)]2+的最低激发单态和三重态到基态的无辐射概率的减小,增强了[Ru(dmb)2(mitatp)]2+发光效率。
Time-resolved laser spectroscopy was used to study the ultrafast process of ruthenium complex [Ru (dmb) 2 (mitatp)] 2+ emission enhancement. The transient luminescence relaxation of [Ru (dmb) 2 (mitatp)] 2+ and [Ru (dmb) 2 (mitatp)] 2 + / DNA complexes was measured using a comparative method. The luminescence of [Ru (dmb) 2 (mitatp)] 2+ and [Ru (dmb) 2 (mitatp)] 2 + / DNA complexes all originated from the charge transfer in [Ru (dmb) 2 Radiation transitions from the singlet and triplet states to the ground state. The fluorescence lifetime of [Ru (dmb) 2 (mitatp)] 2+ was extended from 339 ns to 589 ns by the interaction of ruthenium complex with DNA. The phosphorescence lifetime was prolonged from 16μs to 21μs, and the total luminescence intensity was enhanced by about 1 Magnitude. The analysis shows that the increase of luminescent lifetime and luminescence intensity of [Ru (dmb) 2 (mitatp)] 2+ may be due to the formation of charge transfer state between [Ru (dmb) 2 (mitatp)] 2+ and DNA, [Ru (dmb) 2 (mitatp)] 2+ luminescence efficiency is enhanced by the decrease of the non-radiative probability from the lowest excited singlet and the triplet state to the ground state of [Ru (dmb) 2 (mitatp)] 2+.