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A novel colorimetric chemosensor for selective and highly sensitive determination of thiourea: An approach toward a molecular keypad lock
Author(s) -
Tavallali Hossein,
Rahimi Eisa,
DeilamyRad Gohar,
Karimi Mohammad Ali,
Tavallali Maryam
Publication year - 2021
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.202000485
Subject(s) - chemistry , thiourea , keypad , aqueous solution , naked eye , resorcinol , colorimetry , analyte , detection limit , chromatography , combinatorial chemistry , organic chemistry , computer hardware , computer science
A novel simple reversible colorimetric chemosensor has been designed and developed using 4‐(2‐pridylazo) resorcinol (PAR). The colorimetric receptor PAR has been successfully applied for the determination of Hg 2+ ions, and then the PAR‐Hg 2+ complex has been used for thiourea (TU) measurements in aqueous‐buffer medium. This chemosensor exhibited an obvious color change from yellow to bright red in the presence of Hg 2+ in aqueous solution. In addition, the resulting PAR‐Hg 2+ complex sensed TU through naked‐eye, showing recovery from PAR‐Hg 2+ to PAR, in aqueous solution. The detection limits reached up to 3.01 nmol/L for Hg 2+ and 8.5 nmol/L for TU. The operational simplicity and cost‐effectiveness of colorimetric measurements using PAR and Hg 2+ were achieved. Based on this, the designed method was well used to determine the analytes in industrial and environmental samples. The molecular switching between two chemical inputs (Hg 2+ , TU) consequences in the IMPLICATION molecular logic gate, which has been integrated sequentially to procedure a sequential information processing device.