Photoswitching Using Visible Light: A New Class of Organic Photochromic Molecules
作者:Sameh Helmy、Frank A. Leibfarth、Saemi Oh、Justin E. Poelma、Craig J. Hawker、Javier Read de Alaniz
DOI:10.1021/ja503016b
日期:2014.6.11
A versatile new class of organic photochromic molecules that offers an unprecedented combination of physical properties including tunable photoswitching using visiblelight, excellent fatigue resistance, and large polarity changes is described. These unique features offer significant opportunities in diverse fields ranging from biosensors to targeted delivery systems while also allowing non-experts
Design and Synthesis of Donor–Acceptor Stenhouse Adducts: A Visible Light Photoswitch Derived from Furfural
作者:Sameh Helmy、Saemi Oh、Frank A. Leibfarth、Craig J. Hawker、Javier Read de Alaniz
DOI:10.1021/jo502206g
日期:2014.12.5
The development of an easily synthesized, modular, and tunable organic photoswitch that responds to visiblelight has been a long-standing pursuit. Herein we provide a detailed account of the design and synthesis of a new class of photochromes based on furfural, termed donor–acceptor Stenhouse adducts (DASAs). A wide variety of these derivatives are easily prepared from commercially available starting
Polymerizationphotoinitiators that can be activated under low light intensity and in the visible range are being pursued by both the academic and industrial communities. To efficiently harvest light and initiate a polymerization process, dyes with high molar extinction coefficients in the visible range are ideal candidates. In this field, Donor-acceptor Stenhouse Adducts (DASA) which belong to a class
Unraveling the Photoswitching Mechanism in Donor–Acceptor Stenhouse Adducts
作者:Michael M. Lerch、Sander J. Wezenberg、Wiktor Szymanski、Ben L. Feringa
DOI:10.1021/jacs.6b01722
日期:2016.5.25
from responsive materials and control of biological function to molecular logics. Here, we show that the photoswitching mechanism of donor-acceptor Stenhouse adducts (DASA), a recently reported class of photoswitches, proceeds by photoinduced Z-E isomerization, followed by a thermal, conrotatory 4π-electrocyclization. The photogenerated intermediate is manifested by a bathochromically shifted band in
分子光开关在从响应材料和生物功能控制到分子逻辑的应用中开辟了无数机会。在这里,我们展示了供体-受体 Stenhouse 加合物 (DASA) 的光开关机制,这是最近报道的一类光开关,通过光诱导的 ZE 异构化,然后是热的、旋转的 4π-电环化进行。光生中间体表现为 DASA 可见吸收光谱中的红移带。确定该中间体的作用揭示了光开关机制中的一个关键步骤,这对于通过结构修改合理设计开关特性至关重要。
Preparation of a donor-acceptor Stenhouse Adduct (DASA): 5-((2Z,4E)-5-(diethylamino)-2-hydroxypenta-2,4-dien-1-ylidene)-2,2-dimethyl-1,3-dioxane-4,6-dione.