Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1237492 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2009 | 6 Pages |
Abstract
The UV-vis absorption properties of undoped and doped 1,4-phenylenemethylidynenitrilo-1,4-phenylenenitrilomethylidyne (PAZ) in various temperatures are reported. It is demonstrated that the absorption spectra can be modified not only by changing the temperature from 193Â K to 413Â K, but also via acid-base doping involving the protonation of nitrogen atom in imine group. The use of special protonating agent, i.e. 1,2-(di-2-ethylhexyl)ester of 4-sulfophthalic acid (PSA) lead to the modification of the absorption spectrum of the PAZ. The imine band in UV-vis spectrum of the doped with the PSA polyazomethine is 85Â nm red shifts in comparison with unprotonated one. The thermochromism of PAZ included the conformational changes in the conjugating backbone structure of the undoped and doped polyazomethine.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Agnieszka Iwan, Patrice Rannou,