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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >X-ray transient absorption structural characterization of the ~3MLCT triplet excited state of cis-[Ru(bpy)_2(py) _2]~(2+)
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X-ray transient absorption structural characterization of the ~3MLCT triplet excited state of cis-[Ru(bpy)_2(py) _2]~(2+)

机译:顺式[Ru(bpy)_2(py)_2]〜(2+)〜3MLCT三重激发态的X射线瞬态吸收结构表征

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摘要

The excited state dynamics and structure of the photochemically active complex cis-[Ru(bpy)_2(py)_2]~(2+) have been investigated using optical transient absorption (OTA) and X-ray transient absorption (XTA) spectroscopy, and density functional theory (DFT). Upon light-excitation in aqueous solution cis-[Ru(bpy)_2(py) _2]~(2+) undergoes ultrafast dissociation of one pyridine ligand to form cis-[Ru(bpy)_2(py)(H_2O)]~(2+). OTA measurements highlighted the presence of two major time components of 1700 ps and 130 ps through which the system decays to the ground-state and evolves towards the photoproduct. XTA data were acquired after 150 ps, 500 ps, and 3000 ps from laser excitation (λ_(exc) = 351 nm) and provided the transient structure of the ~3MLCT state corresponding to the longer time component in the OTA experiment. In excellent agreement with DFT, XTA shows that the ~3MLCT geometry is characterized by an elongation of the dissociating Ru-N(py) bond and a shortening of the trans Ru-N(bpy) bond with respect to the ground state. Conversely, calculations show that the ~3MC state has a highly distorted structure with Ru-N(py) bonds between 2.77-3.05 ?.
机译:使用光学瞬态吸收(OTA)和X射线瞬态吸收(XTA)光谱研究了光化学活性复合物顺-[Ru(bpy)_2(py)_2]〜(2+)的激发态动力学和结构,和密度泛函理论(DFT)。在水溶液中被光激发后,顺式[[Ru(bpy)_2(py)_2]〜(2+)经历一个吡啶配体的超快解离,形成顺式[[Ru(bpy)_2(py)(H_2O)]〜 (2+)。 OTA测量结果突出显示了两个主要时间分量的存在,分别为1700 ps和130 ps,系统通过这些时间分量衰减到基态并向光产品方向发展。 XTA数据是在150 ps,500 ps和3000 ps的激光激发后获得的(λ_(exc)= 351 nm),并提供了〜3MLCT状态的瞬态结构,对应于OTA实验中的较长时间分量。 XTA与DFT极为吻合,表明〜3MLCT几何形状的特征是,离解Ru-N(py)键的伸长和相对于基态的反式Ru-N(bpy)键的缩短。相反,计算表明〜3MC态具有高度扭曲的结构,其Ru-N(py)键在2.77-3.05Ω之间。

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