Photochemical reaction mechanisms and kinetics with molecular nanocrystals: surface quenching of triplet benzophenone nanocrystals
Photochemical reaction mechanisms and kinetics with molecular nanocrystals: surface quenching of triplet benzophenone nanocrystals
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DOI：
10.1002/poc.1659
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发表时间：
2010-04
影响因子：
1.8
通讯作者：
S. Simoncelli;Gregory Kuzmanich;Matthew Gard;M. Garcia‐Garibay
中科院分区：
文献类型：
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作者：
S. Simoncelli;Gregory Kuzmanich;Matthew Gard;M. Garcia‐Garibay
悬浮在水中的有机分子纳米晶体在研究固态反应时非常有用，因为它们不仅保留了块状晶体的反应性和超分子特性，而且还适合透射光谱。我们之前通过激光闪光光解透射光谱研究了二苯甲酮纳米晶体的三重态，现在报告了在几种可能的猝灭剂存在下的纳秒实验：阴离子和阳离子表面活性剂、溶解氧以及溶剂氘化（H2O和D2O）的函数。在发现这些没有效果后，通过 Stern-Volmer 分析测试了几种阴离子猝灭剂（I−、Br− 和 N）。溶液中和纳米晶体中的淬灭速率之间的显着相关性表明，表面的淬灭剂可以获得电子激发。版权所有 © 2010 约翰威利父子有限公司
Organic molecular nanocrystals suspended in water are useful when studying reactions that occur in the solid state because they retain not only the reactive and supramolecular properties of bulk crystals, but are also amenable to transmission spectroscopy. Having previously studied the triplet state of benzophenone nanocrystals by laser flash photolysis transmission spectroscopy, we now report nanosecond experiments in the presence of several possible quenchers: anionic and cationic surfactants, dissolved oxygen, and as a function of solvent deuteration (H2O and D2O). After finding these to have no effect, several anionic quenchers (I−, Br−, and N) were tested by Stern–Volmer analysis. Significant correlation between the quenching rates in solution and in nanocrystals suggests that the electronic excitation is accessible to quenchers at the surface. Copyright © 2010 John Wiley & Sons, Ltd.