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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Influence of Sequential Solvation on Metal-to-Ligand Charge Transfer in Bis(2,2',2'-terpyridyl)iron(Ⅱ) Clustered with Dimethyl Sulfoxide
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Influence of Sequential Solvation on Metal-to-Ligand Charge Transfer in Bis(2,2',2'-terpyridyl)iron(Ⅱ) Clustered with Dimethyl Sulfoxide

机译:顺序溶剂化对二甲基亚砜成簇的双(2,2',2“-吡啶基)铁(Ⅱ)中金属到配体电荷转移的影响

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摘要

The first direct measurements of the contributions of individual solvent molecules to solvent reorganization associated with photoinitiated charge transfer in a coordination complex are reported for gas-phase clusters of bis(2,2',2"-terpyridyl)iron(II), [Fe(terpy)↓(2)]↑(2+), with dimethyl sulfoxide (DMSO) prepared by electrospray ionization. Excitation of [Fe(terpy)↓(2)·(DMSO)↓(n)]↑(2+) clusters at wavelengths corresponding to the metal-to-ligand charge-transfer (MLCT) absorption characteristic of Fe(Ⅱ)-polypyridine complexes in solution triggers evaporation of solvent molecules, permitting the application of laser photofragmentation mass spectrometry to monitor MLCT absorption. The energy of the optical transition corresponding to MLCT E↓(op) is reported for [Fe(terpy)↓(2)·(DMSO)↓(n)]↑(2+) clusters (n = 1-11), and the cluster-size dependence of E↓(op) is examined following Jortner's cluster-size-equation approach (Jortner, J. Z. Phys. D 1992, 24, 247). The first 11 DMSO molecules contribute 54-63% of the bulk solvent reorganization energy, based on estimates that E↓(op) for the gas-phase [Fe(terpy)↓(2)]↑(2+) complex falls between 1.860 × 10↑(4) and 1.876 × 10↑(4) cm↑(-1).
机译:据报道,对于双(2,2',2“-吡啶基)铁(II),[Fe]的气相簇,首次直接测量了单个溶剂分子对与配位络合物中光引发的电荷转移相关的溶剂重组的贡献的直接测量。 (terpy)↓(2)]↑(2+),用电喷雾电离制备的二甲基亚砜(DMSO)激发[Fe(terpy)↓(2)·(DMSO)↓(n)]↑(2+)溶液中对应于Fe(Ⅱ)-聚吡啶配合物的金属-配体电荷转移(MLCT)吸收特征的波长的团簇触发了溶剂分子的蒸发,从而允许使用激光碎裂质谱技术监测MLCT的吸收。报告了[Fe(terpy)↓(2)·(DMSO)↓(n)]↑(2+)簇(n = 1-11)对应于MLCT E↓(op)的光学跃迁遵循Jortner的簇大小方程法(Jortner,JZ Phys。D 1992,24,247)检查E↓(op)的大小依赖性。基于气相[Fe(terpy)↓(2)]↑(2+)络合物的E↓(op)介于1.860×10↑(4)的估计,核糖占整体溶剂重组能量的54-63% )和1.876×10↑(4)cm↑(-1)。

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