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A New Compound for Sequential Sensing of Picric Acid and Aliphatic Amines: Physicochemical Details and Construction of Molecular Logic Gates
Author(s) -
Ghosh Ashutosh,
Seth Sourav Kanti,
Ghosh Arnab,
Pattanayak Pradip,
Mallick Arabinda,
Purkayastha Pradipta
Publication year - 2021
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202100117
Subject(s) - picric acid , benzothiazole , moiety , intramolecular force , fluorescence , chemistry , protonation , aqueous solution , detection limit , quenching (fluorescence) , acceptor , photochemistry , combinatorial chemistry , organic chemistry , ion , chromatography , physics , quantum mechanics , condensed matter physics
Picric acid (PA) at low concentration is a serious water pollutant. Alongside, aliphatic amines (AAs) add to the queue to pollute surface water. Plenty of reports are available to sense PA with an ultralow limit of detection (LOD). However, only a handful of works are testified to detect AAs. A new fluorescent donor‐acceptor compound has been synthesized with inherent intramolecular charge transfer (ICT) character that enables selective and sensitive colorimetric quantitative detection of PA and AAs with low LODs in non‐aqueous as well as aqueous solutions. The synthesized compound is based on a hemicyanine skeleton containing two pyridenylmethylamino groups at the donor and a benzothiazole moiety at the acceptor ends. The detailed mechanisms and reaction dynamics are explained spectroscopically along with computational support. The fluorescence property of the detecting compound changes due to protonation of its pyridinyl centers by PA leading to quenching of fluorescence and subsequently de‐protonation by AAs to revive the signal. We have further designed logic circuits from the acquired optical responses by sequential interactions.