Département de chimie, Université de Montréal Montréal, Québec H3C 3J7, Canada.
Macromol Rapid Commun. 2018 Jan;39(1). doi: 10.1002/marc.201700430. Epub 2017 Sep 12.
Exciting new applications, from large-area nanopatterning and templating to soft light-powered robotics, are emerging from the fundamental research on light-triggered changes in macromolecular systems upon photoisomerization of azobenzene-based molecular photoswitches. The understanding of how the initial molecular-scale photoisomerization of azobenzene, a complex photochemical event in itself, is translated into the response of macromolecules and even into macroscopic-scale motion of illuminated azomaterials is an enormous task. The focus here is on how this knowledge has advanced by applying different vibrational spectroscopy techniques that provide rich molecular insight into the photoresponse of chemically specific molecular moieties. In particular, infrared and Raman spectroscopy studies are highlighted, in the context of phototriggered perturbation of self-assembled structures and photoinduced linear and circular anisotropy, as well as photoinduced surface patterning, with the objective of offering a perspective on how vibrational spectroscopy can help in answering an array of essential yet unsettled questions.
从大面积纳米图案形成和模板到软光驱动机器人等令人兴奋的新应用，都源自于对基于偶氮苯的分子光开关光致异构化时，大分子系统中光触发变化的基础研究。了解最初的偶氮苯分子尺度光致异构化（本身就是一个复杂的光化学反应事件）如何转化为大分子的响应，甚至转化为受光照的偶氮材料的宏观尺度运动，是一项艰巨的任务。这里的重点是如何通过应用不同的振动光谱技术来推进这方面的知识，这些技术为化学特定分子部分的光响应提供了丰富的分子见解。特别强调了红外和拉曼光谱研究，其背景是自组装结构和光诱导线性和圆二色性的光触发扰动，以及光诱导表面图案化，目的是提供一个视角，说明振动光谱如何帮助回答一系列重要但尚未解决的问题。
