中国化学会第32届学术年会
重要日期
注册参加会议 登录会议管理
线上墙报
Unprecedentedly Ultrafast Dynamics of Excited States of C=C Photoswitching Molecules in Nanocrystals and Microcrystals
庞君洪 李明德*

分会

第四十八分会:化学动力学

摘要

The C=C photo-switching molecules (1,2-Di(4-pyridyl)ethylene (DPE), 4-styrylpyridine (SP) and trans-1,2-stilbene (TS)) show favorable photoisomerization characteristics. Although the solid states of photo-switching molecules are usually used in optical devices, their excited state’s evolution have been little explored. Here, the excited state’s relaxation of DPE, SP, and TS in nanocrystal/microcrystal suspensions as well as in solution phase were studied to uncover the early events of their excited states. The dynamics of nanocrystal/microcrystal suspensions was tremendously accelerated in comparison to the kinetics obtained in the solution for these molecules under excitation. DPE exhibits the slowest decay rate while SP shows the fastest decay rate whether in the nanocrystal suspensions or the solution, suggesting SP may be the best candidate unit for the photo-switching device. The intermolecular interactions and space restriction of crystal lead to the acceleration of excited state’s evolution for DPE, SP and TS. This provides new insight on the design of optical materials.

关键词

Excited state;nanocrystal;photo-switching;dynamics;transient absorption

线上墙报仅限年会已缴费参会代表观看。

您还没有登录,请您先 点击这里登录