Electron Transfer between Hydrogen-Bonded Pyridylphenols and a Photoexcited Rhenium(I) Complex
作者:William Herzog、Catherine Bronner、Susanne Löffler、Bice He、Daniel Kratzert、Dietmar Stalke、Andreas Hauser、Oliver S. Wenger
DOI:10.1002/cphc.201201069
日期:2013.4.15
Two pyridylphenols with intramolecular hydrogen bonds between the phenol and pyridine units have been synthesized, characterized crystallographically, and investigated by cyclic voltammetry and UV/Vis spectroscopy. Reductive quenching of the triplet metal‐to‐ligand charge‐transfer excited state of the [Re(CO)3(phen)(py)]+ complex (phen=1,10‐phenanthroline, py=pyridine) by the two pyridylphenols and
合成了两个在酚和吡啶单元之间具有分子内氢键的吡啶基酚,对其进行了晶体学表征,并通过循环伏安法和UV / Vis光谱进行了研究。[Re(CO)3(phen)(py)] +的三重态金属-配体电荷转移激发态的还原猝灭通过稳态和时间分辨发光光谱以及瞬态吸收光谱研究了两个吡啶基酚和两个参考酚分子的复合物(phen = 1,10-菲咯啉,py =吡啶)。发光猝灭数据的Stern-Volmer分析提供了双分子激发态猝灭反应的速率常数。吡啶基酚的H / D动力学同位素效应约为2.0,并且吡啶基酚的双分子淬灭反应比参考酚快100倍。该观察结果归因于吡啶基苯酚相对于参比苯酚(≈0.5V)明显较低的正氧化电势,这反过来又是由苯酚氧化过程的质子偶合引起的。