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Influence of alkyl chains on fluoranthene ensembles towards fluorescence-based detection of 2,4,6-trinitrophenol

Kasthuri, S and Kumar, Shiv and Raviteja, S and Ramakrishna, Buthanapalli and Maji, Samarendra and Veeraiah, N and Venkatramaiah, N (2019) Influence of alkyl chains on fluoranthene ensembles towards fluorescence-based detection of 2,4,6-trinitrophenol. In: APPLIED SURFACE SCIENCE, 481 . pp. 1018-1027.

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Official URL: https://dx.doi.org/10.1016/j.apsusc.2019.03.207


A series of novel p-electron rich fluoranthene derivatives (P1-P3) adorned with symmetrical and unsymmetrical alkoxy chains were developed using Diels-Alder reaction. The use of peripheral triethyleneglycol (TEG) chains on fluoranthene enhances its electron donating ability and furnishes decrease in their energy levels and optical band gap. The intense sky-blue fluorescence exhibiting fluoranthene ensembles have been investigated as potential fluorescent chemosensors for the detection of explosive nitroaromatics (NACs). Fluorescence studies demonstrate that emission intensity of P1-P3 was efficiently decreased upon interaction with picric acid (PA) in a dominant static quenching phenomena which is attributed to photoinduced electron transfer process. The limit of detection (LOD) was found to be in the range of 2-20 ppb. The vapour phase sensing study involving thin films of P1-P3 showed efficient quenching response and sensing process is found to be highly reversible. Surface morphology of thin films significantly varied with the type of alkyl chain present on fluoranthene. The thin films are highly selective towards PA in aqueous medium containing commonly interfering nitro-explosives. Contact mode approach using silica gel substrates allows femto-gram detection of trinitrotoluene (TNT) and PA makes these materials as potential chemosensors for real time applications.

Item Type: Journal Article
Additional Information: copyright for this article belongs to ELSEVIER SCIENCE BV
Keywords: Fluoranthene; Fluorescence studies; Photophysics; Picric acid sensor; Photo induced electron transfer
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 11 Sep 2019 06:22
Last Modified: 11 Sep 2019 06:22
URI: http://eprints.iisc.ac.in/id/eprint/63222

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