文献类型：期刊文献

英文题名：Effect of alkyl length dependent crystallinity for the mechanofluorochromic feature of alkyl phenothiazinyl tetraphenylethenyl acrylonitrile derivatives

作者：Ma, Chunping Zhang, Xiqi Yang, Yang Ma, Zhiyong Yang, Liutao Wu, Yujiao Liu, Hongliang Jia, Xinru Wei, Yen

第一作者：马春平

通信作者：Ma, CP[1]|[144404c59386af0196f94]马春平;

机构：[1]Guizhou Inst Technol, Coll Mat & Met Engn, Guiyang 550003, Peoples R China;[2]Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China;[3]Tsinghua Univ, Tsinghua Ctr Frontier Polymer Res, Beijing 100084, Peoples R China;[4]Chinese Acad Sci, Tech Inst Phys & Chem, Lab Bioinspired Smart Interface Sci, Beijing 100190, Peoples R China;[5]Peking Univ, Beijing Natl Lab Mol Sci, Coll Chem & Mol Engn, Key Lab Polymer Chem & Phys,Minist Educ, Beijing 100871, Peoples R China

第一机构：贵州理工学院材料与冶金工程学院

通信机构：corresponding author), Guizhou Inst Technol, Coll Mat & Met Engn, Guiyang 550003, Peoples R China.|贵州理工学院材料与冶金工程学院;贵州理工学院;

年份：2016

卷号：4

期号：21

起止页码：4786-4791

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20162302472156);Scopus(收录号：2-s2.0-84971519014);WOS:【SCI-EXPANDED(收录号:WOS:000377516900024)】；

基金：This research was supported by the Guizhou Province Science and Technology Planning Project ([2015]2068), the National Science Foundation of China (No. 21134004, 21474057 and 51503046), the National 973 Project (No. 2011CB935700), and the Research Project for High-level Talents of Guizhou Institute of Technology (XJGC201503).

语种：英文

外文关键词：Charge transfer - Differential scanning calorimetry - Fluorescence - Mass spectrometry - Nanocrystalline materials - Quantum theory - Red Shift - X ray scattering

摘要：Three novel alkyl phenothiazinyl tetraphenylethenyl acrylonitrile derivatives (PhC3P4, PhC6P4, and PhC12P4) with alkyl groups of different lengths (-C3H7, -C6H13, -C12H25) were prepared in high yield (>90%) and successfully confirmed using H-1 NMR, C-13 NMR, and mass spectrometry. Quantum mechanical computation demonstrated significant difference in the conformation of alkyl chains among the compounds, but showed no obvious difference in the migration of electron clouds. Apparent twisted intramolecular charge transfer (TICT) and an aggregation-induced emission (AIE) nature were evidenced in these derivatives. However, totally different mechanofluorochromic properties were found in three compounds, as PhC3P4 showed an obvious red-shifted mechanofluorochromic feature, while PhC6P4 and PhC12P4 exhibited almost no mechanofluorochromic phenomenon. Therefore, X-ray scattering, time-resolved emission-decay behaviour, and differential scanning calorimetry were performed, indicating that the mechanofluorochromic mechanism of PhC3P4 was attributed to the obvious phase transformation from the crystalline to the amorphous state, and a significant increase of the weighted mean lifetime. In comparison, PhC6P4 and PhC12P4 showed an amorphous state in the original sample, and had no apparent change of the aggregated state and weighted mean lifetime after grinding, which might be due to the steric effect of the long alkyl group in the compounds. Reversible mechanofluorochromic behaviour by fuming the ground sample was observed in PhC3P4, making it a promising smart fluorescent material for fluorescence switches and mechanosensors. The discussion on the effect of alkyl length dependent crystallinity for mechanofluorochromic compounds in this work would provide a new path to modify the performance of mechanofluorochromic materials.