期刊
CHEMISTRY OF MATERIALS
卷 23, 期 3, 页码 789-794出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm1020355
关键词
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资金
- Australian Research Council [FF0668728, DP09A6838]
- University of Queensland (Strategic Initiative-Centre for Organic Photonics Electronics)
We have investigated a series of branched fluorescent sensing compounds with thiophene units in the arms and triphenylamine centers for the detection of nitrated model compounds for 2,4,6-trinitrotoluene (TNT) and the plastic explosives taggant 2,3-dimethyl-2,3-dinitrobutane (DMNB). Stern-Volmer measurements in solution show that the fluorescence is more efficiently quenched by nitroaromatic compounds when compared to a non-nitrated quencher, benzophenone. Simple modification of the structure of the sensing compound was found to result in significant changes to the sensitivity and selectivity toward the nitrated analytes. A key result from time-resolved fluorescent measurements showed that the chromophore-analyte interaction was primarily a collisional process. This process is in contrast to conjugated polymers where static quenching dominates, a difference that could offer a potentially more powerful detection mechanism.
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