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Proceedings Paper

Temperature enhancement of photoactivity of N-triphenylmethylsalicylidene imine in solid state
Author(s): Aleksandra Lewanowicz
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Paper Abstract

Spectral behavior of chromic N-triphenylmethylsalicylidene imine in solid state has been investigated as function of temperature in 300-77 K temperature range. The analysis of the absorption, fluorescence and fluorescence excitation spectra together with the results of microscopic observation has been taken into account in monitoring of changing features. Direct evidence of the keto tautomer (open form) and intermediate formation has been presented, and dynamics of the intramolecular processes have been shortly discussed. The experimental activation energies equal to 5.9 kcal/mol and 9.5 kcal/mol have been extracted from the kinetics of thermally driven changes of luminescence. Those values have been attributed to 540-nm and 510-nm as well as 490-nm emitting species. Besides radiative transition, two main nonradiative deactivation channels, nonradiative transition and photochemical reaction, have been considered in explanation of the thermally enhanced photoactivity of the crystal under study. Contrary to a model anil compound, the photoactivity of studied molecular system with bulky substituent could be realized as dual-type behavior, thermochromic as well as photochromic simultaneously. The changes of the crystal color have been discussed in the frame of the proposed scheme. The scheme represents junction of thermochromic and photochromic behaviors following the proton transfer photochemical reaction acting as the first step of molecular rearrangement.

Paper Details

Date Published: 22 October 2003
PDF: 10 pages
Proc. SPIE 5136, Solid State Crystals 2002: Crystalline Materials for Optoelectronics, (22 October 2003); doi: 10.1117/12.519743
Show Author Affiliations
Aleksandra Lewanowicz, Wroclaw Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 5136:
Solid State Crystals 2002: Crystalline Materials for Optoelectronics
Jaroslaw Rutkowski; Antoni Rogalski, Editor(s)

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