Preparation of Chiral 1,4-Phenylene-silicas via Chiral Low-molecular-weight Amphiphiles  

作　　者：XIAO Min LIU Xiao-juan HU Kai WU Li-min LI Yi LI Bao-zong YANG Yong-gang 

机构地区：[1]Key Laboratory of Organic Synthesis of Jiangsu Province,College of Chemistry,Chemical Engineering and Materials Science,Sooehow University,Suzhou 215123,P.R.China

出　　处：《Chemical Research in Chinese Universities》2012年第4期637-641,共5页高等学校化学研究（英文版）

基　　金：Supported by the Program of Innovative Research Team of Soochow University;the Priority Academic Program Development(PAPD) of Jiangsu High Education Institutions;the National Natural Science Foundation of China(Nos.21071103,21074086)

摘　　要：Chiral organic-inorganic hybrid silicas can be prepared via the self-assemblies of chiral surfactants and gelators as templates.However,the relationship between the chirality of the hybrid silica and the structure of the surfactant/gelator has not been systemically studied.Herein,a series of chiral low-molecular-weight amphiphiles（LMWAs） derived from L-valine was synthesized.Their alkyl chains were n-butadecyl,n-hexadecyl and n-octadecyl,respectively.They can form viscous liquids in pure water,and physical gels in tetrahydrofuran,cyclohexanone,acetonitrile,acetone,chlorobenzene and nitrobenzene.Chiral 1,4-phenylene-silicas were prepared via the self-assemblies of these LMWAs as templates.With increasing the alkyl chain length,the 1,4-phenylene-silicas changed from short mesoporous nanorods to long nanotubes.The circular dichroism spectra of the 1,4-phenylene-silicas indicated that the long nanotubes exhibit the strongest chirality.Chiral organic-inorganic hybrid silicas can be prepared via the self-assemblies of chiral surfactants and gelators as templates.However,the relationship between the chirality of the hybrid silica and the structure of the surfactant/gelator has not been systemically studied.Herein,a series of chiral low-molecular-weight amphiphiles（LMWAs） derived from L-valine was synthesized.Their alkyl chains were n-butadecyl,n-hexadecyl and n-octadecyl,respectively.They can form viscous liquids in pure water,and physical gels in tetrahydrofuran,cyclohexanone,acetonitrile,acetone,chlorobenzene and nitrobenzene.Chiral 1,4-phenylene-silicas were prepared via the self-assemblies of these LMWAs as templates.With increasing the alkyl chain length,the 1,4-phenylene-silicas changed from short mesoporous nanorods to long nanotubes.The circular dichroism spectra of the 1,4-phenylene-silicas indicated that the long nanotubes exhibit the strongest chirality.

关 键 词：Mesoporous nanorods HELICITY 1 4-Phenylene-silica Surfactant Sol-gel process 

分 类 号：TQ127.2[化学工程—无机化工] O647.2[理学—物理化学]