A turn-on green channel Zn2+ sensor and the resulting zinc(II) complex as a red channel HPO42- ion sensor: a new approach

作者：Lohar Somenath; Pal Siddhartha; Mukherjee Manjira; Maji Abhishek; Demitri Nicola; Chattopadhyay Pabitra

来源：RSC Advances, 2017, 7(41): 25528-25534.

DOI：10.1039/c7ra02175e

A newly synthesized and spectroscopically characterized non-fluorescent organic moiety (L'H) selectively sensed Zn2+ ions based on a chelation-enhanced fluorescence (CHEF) process at the lambda(em) of 520 nm through the formation of a new dinuclear zinc(II) complex (1). Upon the addition of Zn2+ ions to the solution of L'H in dimethyl sulphoxide at 25 degrees C, a systematic enhancement of fluorescence was observed, which was not affected by the presence of competitive ions. The reaction of L'H with Zn2+ 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 of 1 was established by spectroscopic tools along with a detailed structural analysis carried out using single crystal X-ray crystallography. In addition, the complex 1 also behaved as a red-shifted, HPO42- ion-selective chemosensor at the lem of 595 nm based on a displacement approach in dimethyl sulphoxide. Interestingly, 1 showed remarkable sensitivity towards HPO42- ions via fluorescence modulation of the dinuclear zinc(II) complex (1) compared with the other anions examined herein.

• 出版日期2017