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    Diaminomaleonitrile based chromo-fluorescent receptor molecule for selective sensing of Mn(II) and Zn(II) ions

    Year: 2018

    Journal: Sens. Actuator B-Chem., Volume 260, MAY 1, page 1012–1017

    Authors: Swami, Suman; Agarwala, Arunava; Behera, Debasis; Shrivastava, Rahul

    Organizations: SERB-DST New Delhi, India [EMR/2016/002123]

    Keywords: 2,3-diaminomaleonitrile; Pyrazole; Colorimetric detection; Fluorescence

    A new class of chemosensors (Ll-L3) based on sequential coupling of 2,3-diaminomaleonitrile, 4-formyl-1-substituted phenyl-pyrazole-3-carboxylate and 2-hydroxy-l-naphthaldehyde through imine linkages were successfully designed and synthesized. The synthesized chemosensors showed quick colorimetric response with excellent selectivity and sensitivity towards detection of Mn2+ and Zn2+ ions in preference of other cations. Along with this, chemosensors also serve as fluorescent turn 'off' and turn 'on' switch for detection of Mn2+ and Zn2+ ion respectively. Analytical characterization were evaluated using UV-vis titration, fluorescent titration and Job's plot methods which revealed that sensor interact with Mn2+ and Zn2+ ion in 1:1 and 1:2 binding stoichiometry respectively. (C) 2018 Elsevier B.V. All rights reserved.
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