Pandey, Rampal ; Kumar, Prashant ; Singh, Ashish Kumar ; Shahid, Mohammad ; Li, Pei-zhou ; Singh, Sanjay Kumar ; Xu, Qiang ; Misra, Arvind ; Pandey, Daya Shankar (2011) Fluorescent zinc(II) complex exhibiting “on-off-on” switching toward Cu2+ and Ag+ ions Inorganic Chemistry, 50 (8). pp. 3189-3197. ISSN 0020-1669
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Official URL: http://pubs.acs.org/doi/abs/10.1021/ic1018086
Related URL: http://dx.doi.org/10.1021/ic1018086
Abstract
Binuclear zinc(II) and copper(II) complexes based on a new Schiff base ligand N,N′-bis(2-hydroxybenzilidene)-2,4,6-trimethylbenzene-1,3-diamine (H2L) have been synthesized. The ligand H2L and complexes under investigation have been characterized by elemental analyses, spectral (FT-IR, 1H, 13C NMR, ESI-MS, electronic absorption, emission), and electrochemical studies. The structures of H2L and complexes [{Zn(C23H18N2O2)}2] (1) and [{Cu(C23H18N2O2)}2]·H2O (2) have been determined crystallographically. Selective “On-Off-On” switching behavior of the fluorescent complex 1 has been studied. The fluorescence intensity of 1 quenches (turns-off) upon addition of Cu2+, while enhances (turns-on) in the presence of Ag+ ions. The mechanisms of “On-Off-On” signaling have been supported by 1H NMR, ESI-MS, electronic absorption, and emission spectral studies. Job’s plot analysis supported 1:1 and 1:2 stoichiometries for Cu2+ and Ag+ ions, respectively. Association and quenching constants have been estimated by the Benesi−Hildebrand method and Stern−Volmer plot. Moreover, 1 mimics a molecular keypad lock that follows correct chemical input order to give maximum output signal.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Chemical Society. |
ID Code: | 105319 |
Deposited On: | 20 Apr 2017 11:52 |
Last Modified: | 20 Apr 2017 11:52 |
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