Distyrylbenzene-based segmented conjugated polymers: Synthesis, thin film morphology and chemosensing of hydrophobic and hydrophilic nitroaromatics in aqueous media

POLYMER

卷:113

Article

Almassio, Marcela F.¹  Romagnoli, Maria J.¹  Del Rosso, Pablo G.¹  Belen Schvval, Ana¹  Garay, Raul O.¹ 

[1] Univ Nacl Sur, CONICET, Dept Quim, INQUISUR, Alem 1253, RA-8000 Bahia Blanca, Buenos Aires, Argentina

关键词: Segmented conjugated polymer;    Fluorescence quenching;    Film sensor;    Nitroaromatics;    Aqueous phase;   

DOI  :  10.1016/j.polymer.2017.02.069

来源: Elsevier

【 摘 要 】

Two new segmented conjugated polymers bearing distyrylbenzene chromophoric units and their model compounds were synthesized. The tendency of the model compounds to form H- and J-type aggregates in the amorphous matrix was greatly diminished by the twisted polymeric architecture. Fluorescence anisotropy measurements indicated good exciton mobilities in condensed phase. Fluorescence quenching by nitroaromatic aqueous solutions was fast, complete, selective and reversible pointing to a rapid diffusion of analytes into the films. The quenching response to nitrophenols was superior to that against nitrotoluenes. The increase of the electron-donating capabilities by diethoxy-substitution was detrimental to the amorphous morphology and it did not increase sensitivity to NACs. Quenching efficiencies of polymers were not modified when MeOH was used instead of water. The solubility parameter distances, R-a. indicate that the sensing materials show higher responses when their affinity with the analytes is lower. This observation could help in the designing of fluorescent sensors. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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