Electrogenerated Chemiluminescence. 81. Influence of Donor and Acceptor Substituents on the ECL of a Spirobifluorene-Bridged Bipolar System
- 10 February 2005
- journal article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 109 (9), 3984-3989
- https://doi.org/10.1021/jp045548x
Abstract
The electrochemistry and radical ion annihilation electrogenerated chemiluminescence (ECL) of 9,9‘-spirobifluorene-bridged bipolar systems containing 1,3,4-oxadiazole-conjugated oligoaryl and triarylamine substituents were investigated. The stability of the oxidized spirobifluorenes was improved by functionalization with triarylamine centers. These donor−acceptor (DA) compounds exhibited a good fluorescence efficiency with an emission maximum that correlated with the potential difference between radical anion and cation formation, suggesting a charge transfer (CT) emission band. An ECL mechanism based on the formation of the CT excited state by radical ion annihilation or production of the triplet state followed by triplet−triplet annihilation, with perhaps some excimer contribution, is proposed.Keywords
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