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Quinone based oligomeric sensors as colorimetric probes for cyanide anion: Effects of solvent medium and substituent on sensing.

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Title: Quinone based oligomeric sensors as colorimetric probes for cyanide anion: Effects of solvent medium and substituent on sensing.
Authors: Reddy, P. Madhusudhana1, Hsieh, Shih-Rong2, Wu, Wan-Chi1, Chang, Chi-Jung1 changcj@fcu.edu.tw, Chen, Yi-Shao1, Lee, Ming-Ching2
Source: Reactive & Functional Polymers. Feb2018, Vol. 123, p26-33. 8p.
Subjects: Oligomerization, Colorimetric analysis, Quinone compounds, Thiourea, Ion exchange chromatography, Physiology
Abstract: The main objective of the present study is to understand the structure-property relationships of sensor capable of colorimetric response, upon the addition of particular anions, due to hydrogen-bonding association between sensor and anion. Further, hydrogen-bonding association between sensor and anion, and thereby colorimetric response of the receptor in various solvent media was also targeted. For this, we have synthesized chloro-substituted quinone based oligomer sensor (QO-Cl) and cyano-substituted quinone based oligomer sensor (QO-CN), which contain the thiourea as a binding site. These oligomeric sensors were exploited as colorimetric sensors for cyanide anion [CN − ]. Further, the sensing abilities of these sensors for CN − recognition in various solvents were monitored to investigate the influence of solvent on the hydrogen bonding association between sensor and anion. Our colorimetric and spectrometric results unveiled that the QO-CN sensor has shown the better binding constant (K QO-CN - CN − = 39,317 M − 1 ) and detection of limit (DOL = 1.2 μM) for CN − than that of QO-Cl, (K QO-Cl - CN − = 1950 M − 1 ; DOL = 69 μM). This can be attributed to the higher electron withdrawing nature of C N than the moderately electron-withdrawing substituent Cl. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The main objective of the present study is to understand the structure-property relationships of sensor capable of colorimetric response, upon the addition of particular anions, due to hydrogen-bonding association between sensor and anion. Further, hydrogen-bonding association between sensor and anion, and thereby colorimetric response of the receptor in various solvent media was also targeted. For this, we have synthesized chloro-substituted quinone based oligomer sensor (QO-Cl) and cyano-substituted quinone based oligomer sensor (QO-CN), which contain the thiourea as a binding site. These oligomeric sensors were exploited as colorimetric sensors for cyanide anion [CN − ]. Further, the sensing abilities of these sensors for CN − recognition in various solvents were monitored to investigate the influence of solvent on the hydrogen bonding association between sensor and anion. Our colorimetric and spectrometric results unveiled that the QO-CN sensor has shown the better binding constant (K QO-CN - CN − = 39,317 M − 1 ) and detection of limit (DOL = 1.2 μM) for CN − than that of QO-Cl, (K QO-Cl - CN − = 1950 M − 1 ; DOL = 69 μM). This can be attributed to the higher electron withdrawing nature of C N than the moderately electron-withdrawing substituent Cl. [ABSTRACT FROM AUTHOR]
ISSN:13815148
DOI:10.1016/j.reactfunctpolym.2017.12.007