ISSN:
1434-193X
Keywords:
Intramolecular charge transfer
;
Solvatochromism
;
Biaryl compounds
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The UV/Vis absorption and fluorescence spectra for 9,9′-biacridinyl (BAC) and 9-(9′-acridyl)carbazole (C9AC) were recorded in approximately 50 different solvents. The analysis of the solvatochromic behaviour of the two chromophores, in terms of both polarity and polarizability (SPP), revealed that TICT emission in C9AC prevails only in solvents with SPP ≥ 0.63, while that in BAC predominates throughout the solvent range studied [from 2-methylbutane (SPP = 0.479) to DMSO (SPP = 1.0)]. The peculiar behaviour of BAC suggests that the chromophore requires no cooperation from the solvent to trigger its TICT mechanism. Various hypotheses usually employed in analysing the TICT mechanism of biaryl compounds, including model emissions used to deconvolute spectra, the variation of TICT emission with the difference in redox potential between the chromophores involved, etc., are discussed.
Type of Medium:
Electronic Resource
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