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“Receptor Free” Inner Filter Effect Based Universal Sensor for Nitroexplosive Picric Acid Using Two Polyfluorene Derivatives in Solution and Solid State

Abstract

Two “Receptor-free” blue fluorescent conjugated polymers (CPs) of fluorene namely 9,9-bis(6-bromohexyl)-2-phenyl-9H-fluorene (PF1) and 9,9-bis(6-bromohexyl)-9H-fluorene (PF2) were synthesized using Suzuki cross coupling polymerization and oxidative coupling polymerization methods in high yields and well characterized by gel permeable chromatography, NMR, UV-vis, fluorescence and time-resolved photoluminescence (TRPL) spectroscopies. Both CPs explicitly recognized nitroexplosive picric acid (PA) and displayed fluorescence quenching response in solution and on solid support via Inner Filter Effect (IFE) mechanism. Both CPs were highly selective and sensitive towards PA with a high quenching constant values (Ksv) of 5.1 × 104 M-1 and 5.0 × 104 M-1 and remarkably low limit of detection (LOD) values of 110 nM and 219 nM. Contact mode detection of PA was also accomplished using economical and transportable fluorescent paper test strip devices for on-site sensing, which detects a minimum of 22.9 femtogram level of PA. IFE mechanism for PA sensing (or for other analytes) is an intersting concept that can detect PA by just having blue fluorescence. Therefore, careful experiments for IFE correction were performed herein for PA detection to observe ~77% suppression efficiency due to IFE. These studies provide fundamentally important information to IFE based mechanism for the detection of various analytes.

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Publication details

The article was accepted on 06 Nov 2018 and first published on 07 Nov 2018


Article type: Paper
DOI: 10.1039/C8AN01970C
Citation: Analyst, 2018, Accepted Manuscript
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    “Receptor Free” Inner Filter Effect Based Universal Sensor for Nitroexplosive Picric Acid Using Two Polyfluorene Derivatives in Solution and Solid State

    A. S. Tanwar, S. Patidar, S. K. Ahirwar, S. Dehingia and P. K. Iyer, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN01970C

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