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Volume 5, Issue 3 (Suppl)
Mod Chem Appl, an open access journal
ISSN: 2329-6798
Global Chemistry 2017
September 04-06, 2017
September 04-06, 2017 | London, UK
5
th
Global Chemistry Congress
Mod Chem Appl 2017, 5:3(Suppl)
DOI: 10.4172/2329-6798-C1-006
Selective TNT fluorescent sensor from benzimidazole-isoquinolinone derivatives
Paitoon Rashatasakhon
Chulalongkorn University, Thailand
T
hree new pyrene-substituted benzimidazole-isoquinolinones which are different in the positions and numbers of the pyrene
groups are designed and synthesized via imidation-condensation reaction and Suzuki coupling. The compounds are fully
characterized by spectroscopic and spectrometric techniques. Interestingly, these compounds exhibit Aggregation-Induced
Emission Enhancement (AIEE) in highly aqueous THF media and selective fluorescent quenching towards trinitrotoluene
(TNT). The compound with two pyrene units has the best selectivity towards TNT and has a quenching efficiencies (Ksv) of
60,000 M-1, which leads to the estimation of the detection limit of 0.25 ppm TNT. The sensing mechanism involves the -
interaction between the pyrene moieties and electron-poor TNT. In addition, the solid-state sensors are prepared by pipetting
a solution of this sensor into 1-cm circular fluid reservoirs patterned by wax-printing technique on a piece of filter paper. The
easy-to-use sensor can readily detect TNT in aqueous media by naked-eye observation at the concentration as low as 50 µM.
It can also detect TNT vapor in closed chamber within 5 minutes of exposure at room temperature.
Paitoon.r@chula.ac.th