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A Categorical Naked‐Eye Detection of Cu 2+ and Zn 2+ through a Donor‐Acceptor‐Donor (D‐A‐D)‐Type Salicylaldimine: An Experimental and Theoretical Approach
Author(s) -
Kumar Virendra,
Diwan Uzra,
Sanskriti Isha,
Mishra Rakesh K.,
Upadhyay K. K.
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701923
Subject(s) - naked eye , intramolecular force , chemistry , schiff base , crystallography , acceptor , stereochemistry , physics , detection limit , chromatography , condensed matter physics
A Schiff base viz., 2,3‐bis‐(3, 5‐di‐tert‐butyl‐2‐hydroxybenzylidene) amino maleonitrile (TBCN) , having donor–acceptor–donor (D–A–D) type constitution exhibited Cu 2+ and Zn 2+ guided specific modulations in its ICT (intramolecular charge transfer) characteristics. The corresponding naked eye changes for Cu 2+ and Zn 2+ involved the shifting of characteristic ICT band of TBCN at ∼472 nm (yellow) to ∼ 566 nm (pink) and ∼590 nm (indigo blue) respectively in a semi‐aqueous medium (EtOH:H 2 O in a ratio of 8:2 v/v). The TBCN as well as its ensembles with Cu 2+ and Zn 2+ were fully characterized through their single crystal XRD studies along with spectroscopic and mass spectral studies. The DFT and the time‐dependent DFT calculations provided a genuine rationale for separate naked eye colorimetric changes of TBCN for Cu 2+ and Zn 2+ .