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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photophysics of Ru(II) Dyads Derived from Pyrenyl-Substitued Imidazo[4,5-f][1,10]phenanthroline Ligands
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Photophysics of Ru(II) Dyads Derived from Pyrenyl-Substitued Imidazo[4,5-f][1,10]phenanthroline Ligands

机译：P基取代的咪唑并[4,5-f] [1,10]菲咯啉配体的Ru（II）二元化合物的光物理性质

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摘要

The photophysicS of a Series of Ru(II) dyads based on the 2-(1-pyrerry1)-IH-imidazo[42,5-f][1,10]-phenanthroline ligand was investigated. The ability of these metal coinplexes to intercalate DNA and induce cell death upon photoactivation makes them attractive photosensitizers for a range of photobiological applications, Including photodynamic therapy. In the present study, time-resolved transient absorption and emission spectroscopy were used to Interrogate the photoinduced processes that follow metal-to-ligand charge transfer excitation of the complexes in solution. It Was found that energy transfer to pyrene-localized intraligand triplet states, facilitated by torsional motion of the pyrene moiety relative to the imidazo[4,5-f] [1,10]phenanthroline ligand was an important relaxation pathway governing the photophysical dynamics RI this class of compounds. Biphasic decay kinetics were assigned to spontaneous (pre-equilibrium) and delayed emission, arising from an equilibrium established between (MLCT)-M-3 and (IL)-I-3 states. TDDFT calculations supported these interpretations.
机译：研究了基于2-（1-pyrerry1）-IH-咪唑并[42,5-f] [1,10]-菲咯啉配体的一系列Ru（II）二元化合物的光物理性质。这些金属复合物在光激活后插入DNA并诱导细胞死亡的能力使其成为有吸引力的光敏剂，适用于包括光动力疗法在内的一系列光生物学应用。在本研究中，时间分辨的瞬态吸收和发射光谱用于询问溶液中复合物的金属到配体电荷转移激发之后的光诱导过程。发现energy部分相对于咪唑并[4,5-f] [1,10]菲咯啉配体的扭转运动促进了能量转移到to定位的配体三重态，是控制光物理动力学RI的重要弛豫途径。这类化合物。由（MLCT）-M-3和（IL）-I-3状态之间建立的平衡引起的自发性（平衡前）和延迟发射具有双相衰减动力学。 TDDFT计算支持这些解释。

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