This paper reports the self-assembling and two-photon absorption natures of donor acceptor molecules, tri(phenanthro)hexaazatriphenylene (TPHAT-C) and tri(phenanthrolino)hexaazatriphenylene (TPHAT-N), bearing six electron-donating moieties. In the H-1 NMR spectra, a line-broadening effect, arising from self-assembled aggregation was observed. Several hundred nanometer scale aggregates were detected in dynamic light scattering. The one-dimensional aggregation of the TPHAT molecules was indicated by the concentration dependence in UV/vis one-photon absorption and one-photon excited fluorescence spectroscopies. An enhancement of the two-photon absorption cross-section was observed in the self-assembled TPHAT system. The order of the two-photon absorption nature is in agreement with the order of the aggregative nature. (C) 2012 Elsevier Ltd. All rights reserved.
Effect of donor-π-acceptor structure on photochromism of dithienylethene-based dyes
作者:Jong Min Park、Chang Young Jung、Woo-Dong Jang、Jae Yun Jaung
DOI:10.1016/j.dyepig.2020.108315
日期:2020.6
Dithienylethene-based donor-π-acceptor photochromic dyes were synthesized to investigate the effect of the structure on photo-switching properties. Specifically, 3,5-dimethoxyphenyl and 4,4′-tert-butyltriphenylamino groups (donors) and benzoic and cyanoacetic acid groups (acceptors) were attached to an oxazole-based dithienylethene core in a horizontal or vertical fashion. The photochromic properties