A Versatile Approach for In Situ Monitoring of Photoswitches and Photopolymerizations

被引：38

作者：

Dolinski, Neil D. ^{[1
]}

Page, Zachariah A. ^{[1
]}

Eisenreich, Fabian ^{[1
]}

Niu, Jia ^{[1
]}

Hecht, Stefan ^{[1
]}

de Alaniz, Javier Read ^{[1
]}

Hawker, Craig J. ^{[1
]}

机构：

[1] UCSB, Santa Barbara, CA 93106 USA

来源：

CHEMPHOTOCHEM | 2017年 / 1卷 / 04期

基金：

美国国家科学基金会;

关键词：

front propagation; kinetics; molecular switches; NMR spectroscopy; photopolymerization; LIVING RADICAL POLYMERIZATION; PET-RAFT POLYMERIZATION; ACCEPTOR STENHOUSE ADDUCTS; VISIBLE-LIGHT; NMR-SPECTROSCOPY; ILLUMINATION; IRRADIATION; PHOTOCHROMISM; DEPENDENCE; MECHANISM;

D O I：

10.1002/cptc.201600045

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

A simple, inexpensive, and modular method to directly illuminate NMR samples for in situ analysis of photochemical transformations is reported. The versatility of this technique is demonstrated by analyzing the light-induced propagating front for small-molecule photoswitches and the kinetics of photocontrolled living radical polymerizations. In situ measurements allow oxygen-sensitive and rapid photoevents to be studied in detail, leading to reliable determination of photoswitching quantum yields and polymerization rates. By systematically tuning light intensity, a direct relationship between propagation rate and intensity is revealed. Of particular note is the facile translation of the conditions identified through this NMR analysis to analogous benchtop experiments with insight into the nature of the photoreactive species.

引用

页码：125 / 131

页数：7

共 67 条

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A Visible Light Responsive On-Off Polymeric Photoswitch for the Colorimetric Detection of Nerve Agent Mimics in Solution and in the Vapor Phase [J].