32045-31-1Relevant articles and documents
Dipyrromethene chromo-fluorogenic chemosensors for quantitative detection and express analysis of Zn2+ ions
Antina, Elena V.,Berezin, Mikhail B.,Bumagina, Natalia A.,Krasovskaya, Zinaida S.,Ksenofontov, Alexander A.,Semeikin, Alexander S.,Vyugin, Anatoly I.
, (2021/10/27)
The dipyrromethene derivatives as new chromo-fluorogenic chemosensors for quantitative detection and express analysis of Zn2+ ions were synthesized and structural characterized. The sensing process of dipyrromethene toward Zn2+ was evaluated by UV–vis and fluorescence spectroscopy, molar ratios plots, and DFT calculations. The complexation of Zn(AcO)2 with dipyrromethenes in DMF solution was accompanied by significant bathochromic and hyperchromic effects in the electronic absorption spectra due to the formation of [ZnL2] complex. The 1:2 (Zn:HL) binding mode was proposed on the basis of absorption and theoretical studies. The complexation constants (lgKo) of Zn(AcO)2 with dipyrromethenes are from 8.1 to 10.9, which implying the potential of dipyrromethenes to acts as selective chemosensors for Zn2+. It is shown for the first time that the hexamethyl-substituted dipyrromethene could recognize Zn2+ ions in DMF solution through significant (almost 100 times) “off–on” fluorescent response caused by Zn2+ and visible color change from yellow to bright green under UV irradiation induced by formation of [ZnL2]. Hexamethyl-substituted dipyrromethene had high selectivity towards Zn2+ ions over many environmentally relevant ions, and high sensitivity with the detection limit in nanomolar level (4·10–8 mol/L). In terms of the thermodynamic constant and the fluorescence response of the complexation reaction of [ZnL2], as well as the detection limit of Zn2+ ions, dipyrromethene HL2 surpasses many Zn2+ sensors known in the literature. Dipyrromethenes can be a tool for detecting Zn2+ ions with simple test strips.
