«Оn-off» fluorescent sensors for aromatic analytes based on zinc(II) bis(dipyrromethenate)s.
This paper presents the results of spectral-luminescence research of binuclear zinc(II) helicates with tetra-, octa-, and decamethylsubstituted 3,3'-bis(dipyrromethene)s ([Zn2L2]) in binary mixtures of cyclohexane with aromatic hydrocarbons (benzene, toluene, and m-xylene). Structure effects of zinc(II) helicates, and aromaticity criteria of analytes (HOMA, NICS, δ) on the fluorescence quenching efficiency of [Zn2L2] in the presence of aromatic compounds was considered. It was found that decamethylsubstituted 3,3'-bis(dipyrromethenate)s compared to tetra-, and octamethylsubstituted-analogs shows the highest fluorescence sensitivity to the presence of aromatic compounds. High specificity of spectral-luminescence characteristics changing in the presence of particular aromatic analytes provides the possibility of using [Zn2L2] helicates as new fluorescent sensors of aromatic compounds trace amount (120ppb to 56ppm) in organic media.
G.A. Krestov Institution of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya Street, 153045 Ivanovo, Russia. Electronic address: ivalex.09@mail.ru.
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Ksenofontov
G.A. Krestov Institution of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya Street, 153045 Ivanovo, Russia.
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Guseva
G.A. Krestov Institution of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya Street, 153045 Ivanovo, Russia.
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Antina
G.A. Krestov Institution of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya Street, 153045 Ivanovo, Russia.
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Nuraneeva
Aromaticity; Detection limit; Fluorescence quenching; Sensor; Zinc(II) bis(dipyrromethenate)s