A turn-on green channel Zn2+ sensor and the resulting zinc(ii) complex as a red channel HPO42− ion sensor: a new approach. Issue 41 (12th May 2017)

• Record Type: Journal Article
• Authors: Lohar, Somenath; Pal, Siddhartha; Mukherjee, Manjira; Maji, Abhishek; Demitri, Nicola; Chattopadhyay, Pabitra
• Is Part Of: RSC advances. Volume 7:Issue 41(2017)
• Page Start: 25528
• Page End: 25534
• Publication Date: 2017-05-12
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra02175e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A turn-on green channel Zn 2+ sensor and the resulting zinc(ii ) complex as a red channel HPO4 2− ion sensor: a new approach. Abstract : A newly synthesized and spectroscopically characterized non-fluorescent organic moiety (L′H ) selectively sensed Zn 2+ ions based on a chelation-enhanced fluorescence (CHEF) process at the λ em of 520 nm through the formation of a new dinuclear zinc(ii ) complex (1 ). Upon the addition of Zn 2+ ions to the solution ofL′H in dimethyl sulphoxide at 25 °C, a systematic enhancement of fluorescence was observed, which was not affected by the presence of competitive ions. The reaction ofL′H with Zn 2+ ions led to the formation of a dinuclear zinc(ii ) complex, featuring a new in situ formed macrocyclic ligand (L ), which was isolated in pure form and then characterized. The formulation of1 was established by spectroscopic tools along with a detailed structural analysis carried out using single crystal X-ray crystallography. In addition, the complex1 also behaved as a red-shifted, HPO4 2− ion-selective chemosensor at the λ em of 595 nm based on a displacement approach in dimethyl sulphoxide. Interestingly, 1 showed remarkable sensitivity towards HPO4 2− ions via fluorescence modulation of the dinuclear zinc(ii ) complex (1 ) compared with the other anions examined herein.