Ksenofontov A.A.

ZINC(II) BIS(DIPYRROMETENATES) AS NEW FLUORESCENT CHEMOSENSORS OF N- AND O-CONTAINING ANALYTES

The results of spectral studies of the fluorescence of binuclear zinc(II) bis(dipyrrinate)s with 3,3′-, 2,3′- and 2,2′-bis(dipyrrine)s of the composition [Zn2L2] in binary mixtures of cyclohexane and N- and O -containing solvent Х (acetone, DMF, DMSO, TEA) are presented. Spectrophotometric studies have shown that additive in cyclohexane of analyte upto χХ<0.2 leads to red shift (to ~10 nm) of emission band maximum and to a sharp de-crease in fluorescence quantum yield (φ) of [Zn2L2] luminophores. The observed effect is due to the additional coordination processes of the electron-donor molecules X, leading to the formation of solvates [Zn2L2Xn]. The efficiency of fluorescence quenching of [Zn2L2], formed by 3,3′, 2,3′- or 2,2′-bis(dipyrrine)s, is different. Zinc(II) 3,3′-bis(dipyrrometenat) demon-strates the highest sensitivity to fluorescence at the presence of X, as compared with the 2,3′- and 2,2′-analogues.

2016, Т. 59, № 6, Стр. 22-27
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