Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-01-01

Journal: SUPRAMOLECULAR CHEMISTRY

Included Journals: SCIE

Volume: 29

Issue: 5

Page Number: 378-386

ISSN: 1061-0278

Key Words: Fluorescence; chemosensor; recognition; zinc; conformation

Abstract: Two novel receptors HL-1 and HL-2 without and with hydroxyl groups were designed and synthesised. Both receptors showed highly selective coordination towards Zn2+ and exhibited diverse sensing behaviour due to the structural variations. HL-1 showed monotonous turn-on' response towards Zn2+ while HL-2 displayed highly Zn2+ sensitive turn on' and ratiometric' properties. Detailed Job plot experiment, single crystal data, H-1 NMR, ESI-MS, UV-vis and density functional theory calculation studies were conducted to understand the binding modes of HL-1 and HL-2 with Zn2+. These results revealed the binding stoichiometric ratio between receptors and Zn2+ were 1:1 with low detection limits and high binding constants.
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   Two novel receptors HL-1 and HL-2 without and with hydroxyl groups were designed and synthesised via TCR reaction. Both of them showed selective coordination to Zn2+ ions but exhibited incongruent sensing mode due to structural variations. HL-1 showed monotonous 'turn-on' whereas HL-2 displayed highly sensitive 'turn on' and 'ratiometric' properties towards Zn2+.