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Luminescence properties of diamino-dicyano substituted benzene and 1,4-pyrazine

Paper ID Volume ID Publish Year Pages File Format Full-Text
26672 43970 2011 6 PDF Available
Title
Luminescence properties of diamino-dicyano substituted benzene and 1,4-pyrazine
Abstract

The photophysics of several positional isomers of dicyano-diamino benzenes and 1,4-pyrazines in liquid and frozen solutions has been investigated in several organic solvents. Depending on the relative position of donor and acceptor groups the fluorescence lifetimes and quantum yields change over an order of magnitude and more than a double, respectively. This effect can be rationalized in terms of the relative positioning of amino and nitrile groups and the interplay between singlet and triplet sublevels as a direct consequence of the former.

► Dicyano-diamino benzenes and 1,4-pyrazines photophysics strongly depends on the substituents position. ► Absorption, fluorescence and phosphorescence experiments reveal how and why some of the compounds are very strong emitters. ► It is concluded that differences in charge distribution and intersystem-crossing explains the observed trends.

Keywords
Photophysics; Fluorescence; Organic molecules
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Luminescence properties of diamino-dicyano substituted benzene and 1,4-pyrazine
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 225, Issue 1, 1 December 2011, Pages 52–57
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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