2ND HARMONIC-GENERATION BY THE SELF-AGGREGATION OF ORGANIC GUESTS IN MOLECULAR-SIEVE HOSTS

被引:141
作者
COX, SD [1 ]
GIER, TE [1 ]
STUCKY, GD [1 ]
机构
[1] UNIV CALIF SANTA BARBARA, DEPT CHEM, SANTA BARBARA, CA 93106 USA
关键词
D O I
10.1021/cm00011a600
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Inclusion of polar organic molecules in molecular sieve hosts has been investigated as a means of creating self-assembled aggregates of molecules that possess the noncentrosymmetry required for materials to exhibit second harmonic generation (SHG). Aluminophosphate molecular sieves with one-dimensional channel structures are shown by SHG powder measurements to successfully direct this self-aggregation for a number of organic molecules including and related to p-nitroaniline. Models supported by FTIR evidence show the aggregates could be chains of molecules with a large net dipole that form within the molecular sieve channels. The polar host crystal then aligns the aggregates to produce a large bulk dipole moment and the observed SHG signal. Three methods for controlling the SHG intensity within a particular host structure have been elucidated: (1) variation of guest concentration, (2) alteration of guest structure, and (3) changing the charge density on the host framework. © 1990, American Chemical Society. All rights reserved.
引用
收藏
页码:609 / 619
页数:11
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