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Studies on multifunctional chromo-fluorogenic sensor for dual channel recognition of Zn2+ and CNˉ ions in aqueous media: mimicking multiple molecular logic gates and memory devices

Abstract

A new effectual naphthalene-based azomethine receptor has been systematically designed and synthesized as a selective colorimetric and fluorescent chemosensor for dual channel detection of cation and anion in aqueous environment. Moreover, the outstanding spectral responses of devised probe prompted us to fabricate multifunctional molecular logic circuits. Importantly, the introduction of electron-withdrawing nitrile moieties into the backbone of the molecule makes the receptor as efficient tool for detection of toxic cyanide in semi-aqueous media even in the presence of other plausible interfering anions including fluoride and acetate. In particular, addition of KCN to aqueous solution of sensor visibly changes the colour from light yellow to orange, enabling naked-eye CNˉ sensing without resorting to any spectroscopic instrumentation. On the other hand, the fluorescence intensity of receptor at 540 nm was drastically quenched with a strong signature of a redshift of the emissions. Besides, the mechanism of operation was carefully elucidated via spectroscopic methods. Apart from this, target receptor exhibited fluorescent enhancement and colour change upon the addition of Zn2+ ions attributed to the CHEF (chelation-enhanced fluorescence) process in aqueous media. To our surprise, the detection limit of the sensor for zinc ions was (0.11 μM) far below the guidelines of the World Health Organization (WHO) (76 μM) as the maximum allowable zinc concentration in drinking water. Successfully, according to the changes in absorption outputs in pure DMSO at particular wavelengths in response to the set of anions (CNˉ, AcOˉ and Fˉ) as input variables, the function of 3-input logic circuit composed of OR, NOR and NOT gates has been demonstrated. Subsequently, based on the fascinating ON-OFF switching behavior, a complementary IMP/INH logic gate with the complicated function of memory device can be represented by employing CNˉ and H+ as chemical inputs. In accession, according to the emission changes, an IMPLICATION logic gate was elaborated in response to CNˉ and Zn2+ as two ionic inputs.

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Publication details

The article was received on 01 Nov 2017, accepted on 24 Dec 2017 and first published on 26 Dec 2017


Article type: Paper
DOI: 10.1039/C7NJ04216G
Citation: New J. Chem., 2017, Accepted Manuscript
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    Studies on multifunctional chromo-fluorogenic sensor for dual channel recognition of Zn2+ and CNˉ ions in aqueous media: mimicking multiple molecular logic gates and memory devices

    K. Rezaeian, H. Khanmohammadi and S. Gholizadeh Dogaheh, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ04216G

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