Making Fast Photoswitches Faster—Using Hammett Analysis to Understand the Limit of Donor–Acceptor Approaches for Faster Hemithioindigo Photoswitches
作者:Benjamin Maerz、Sandra Wiedbrauk、Sven Oesterling、Elena Samoylova、Artur Nenov、Peter Mayer、Regina de Vivie‐Riedle、Wolfgang Zinth、Henry Dube
DOI:10.1002/chem.201403661
日期:2014.10.20
Herein we use time‐resolved absorption spectroscopy and Hammett analysis to discover an unexpected principal limit to the photoisomerization rate for donor‐substituted HTIs. By using stationary absorption and fluorescence measurements in combination with theoretical investigations, we offer a detailed mechanistic explanation for the observed rate limit. An alternative way of approaching and possibly even
半硫靛蓝(HTI)光电开关由于在可见光区域具有吸收能力以及超快的光异构化和高热双稳性,因此在生物和超分子应用中具有巨大的潜力。合理地为特定应用定制光物理性质是充分利用HTI作为光开关工具的潜力的关键。本文中,我们使用时间分辨吸收光谱法和Hammett分析法发现供体取代的HTI的光异构化速率出乎意料的主要限制。通过结合使用静态吸收和荧光测量以及理论研究,我们为观察到的速率极限提供了详细的机械解释。