A new thiosemicarbazone fluorescent probe based on 9,9'-bianthracene for Hg2+ and Ag

Zhen-E Chen; Hai Zhang; Zafar Iqbal

doi:10.1016/j.saa.2019.02.036

A new thiosemicarbazone fluorescent probe based on 9,9'-bianthracene for Hg²⁺ and Ag

Spectrochim Acta A Mol Biomol Spectrosc. 2019 May 15:215:34-40. doi: 10.1016/j.saa.2019.02.036. Epub 2019 Feb 18.

Authors

Zhen-E Chen¹, Hai Zhang², Zafar Iqbal³

Affiliations

¹ School of Chemistry and Chemical Engineering, Qianbei Featured Resources Applied Research Key Laboratory, Zunyi Normal College, Zunyi 563006, China. Electronic address: zhenechen@vip.sina.com.
² School of Chemistry and Chemical Engineering, Qianbei Featured Resources Applied Research Key Laboratory, Zunyi Normal College, Zunyi 563006, China.
³ Applied Chemistry Research Centre, PCSIR Laboratories Complex, Feroze pur Road Lahore 54000, Pakistan.

PMID: 30825868
DOI: 10.1016/j.saa.2019.02.036

Abstract

A new 9,9'-bianthracene-based thiosemicarbazone (D1) has been successfully synthesized and utilized for chemosensors. The properties of D1 were systematically investigated by UV-Vis, fluorescence titration and theoretical calculations. As a result, D1 exhibits a characteristic fluorescence quenching phenomenon in the presence of Hg²⁺ or Ag⁺ compared to other metal cations (Na⁺, K⁺, Mg²⁺, Ba²⁺, Al³⁺, Zn²⁺, Fe²⁺, Pb²⁺, Cu²⁺, Co²⁺, Cd²⁺, Ni²⁺ and Mn²⁺). The detection limits of Hg²⁺ and Ag⁺ reach 6.62×10^-7M and 1.99×10^-5M, respectively. This is mainly attributed to the Hg²⁺ (or Ag⁺) forms a stable five-membered ring with the N atom in Schiff base CN and the S atom in thiourea. The results suggest that the probe D1 is a promising candidate for chemosensors in aqueous media due to its highly selectivity for Hg²⁺ and Ag⁺.

Keywords: 9,9′-Bianthracene; Fluorescent probe; Hg(2+) and Ag(+); Thiosemicarbazone.