Direct observation of the nuclear motion during ultrafast intramolecular proton transfer
作者:S Lochbrunner、K Stock、E Riedle
DOI:10.1016/j.molstruc.2004.01.038
日期:2004.8
contributing to the reaction path of the ultrafast excited state intramolecular proton transfer (ESIPT) are determined directly from time resolved measurements. We investigate the ESIPT in the compounds 2-(2′-hydroxyphenyl)benzothiazole, 2-(2′-hydroxyphenyl)benzoxazole and ortho -hydroxybenzaldehyde by UV–visible pump-probe spectroscopy with 30 fs resolution. The proton transfer is observed in real time and a
摘要 对超快激发态分子内质子转移 (ESIPT) 的反应路径有贡献的骨骼运动是直接从时间分辨测量中确定的。我们通过分辨率为 30 fs 的紫外-可见泵-探针光谱研究了化合物 2-(2'-羟基苯基)苯并噻唑、2-(2'-羟基苯基)苯并恶唑和邻-羟基苯甲醛中的 ESIPT。实时观察质子转移,并在反应后发现分子在少数振动模式下的特征“环化”。结果表明,分子骨架的弯曲运动减少了质子供体 - 受体距离,并且在足够收缩时发生电子构型变化,导致产物构象异构体的键合。该过程演变为在绝热势能表面上的弹道波包传播。质子通过骨架运动从供体转移到受体位点,不必考虑隧道效应。