Solid-state fluorescence of aromatic dicarboxamides. Dependence upon crystal packing

被引：49

作者：

Lewis, FD

Yang, JS

机构：

[1] Department of Chemistry, Northwestern University, Evanston

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 10期

关键词：

MODEL COMPOUNDS; ALIPHATIC POLYAMIDES; MOLECULAR-STRUCTURE; BENZENE DIMER; CONFORMATION; RECOGNITION; DYNAMICS; EXCIMERS;

D O I：

10.1021/jp9630939

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：

The fluorescence of six secondary arenedicarboxamides has been investigated in single crystals, powders, melts, and ethanol solution. Single crystals of four rodlike arenedicarboxamides which pack in one-dimensional tapes display dual emission attributed to excited-state monomers and dimers. These tapes have a constant 5-Angstrom separation between the long axes of neighboring arenes but differ in the arene-arene dihedral angle. The frequency shift between monomer and dimer fluorescence and the intensity and vibronic structure of the dimer emission are dependent upon the ground-state geometry. Single crystals of two naphthalenedicarboxamides which pack in two-dimensional sheets and have no close contacts between neighboring arenes within the same sheet display only monomer emission. Melted and resolidified samples display broad structureless emission attributed to fluorescence from a mixture of excited monomers and dimers with different ground-state geometries.

引用

页码：1775 / 1781

页数：7

共 49 条

[1] N,N'-DIBENZOYL-PARA-PHENYLENEDIAMINE [J].