Dual Fluorescence of a 10-Hydroxyacridine(1,8)Dione Derivative in Polar Solvents

Stationary luminescence and pulse fluorometry methods were used to study the spectral-kinetic and photophysical properties of a 9-methyl-10-hydroxyacridine(1,8)dione derivative dye (9,10-ACD) in polar protic and aprotic solvents at 293 and 77 K. We are the first to report a new long-wavelength fluor...

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Bibliographic Details
Published in:Journal of applied spectroscopy 2021-11, Vol.88 (5), p.929-934
Main Authors: Bondarev, S. L., Pirko, A. N., Raichenok, T. F., Pilipovich, A. S.
Format: Article
Language:English
Subjects:
Acetonitrile
Analytical Chemistry
Anions
Atomic/Molecular Structure and Spectra
Basicity
Biological effects
Dichloromethane
Dimethyl sulfoxide
Dimethylformamide
Dyes
Emission analysis
Ethanol
Excitation
Fluorescence
Fluorimetry
Physics
Physics and Astronomy
Room temperature
Solvents
Spectra
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Summary:Stationary luminescence and pulse fluorometry methods were used to study the spectral-kinetic and photophysical properties of a 9-methyl-10-hydroxyacridine(1,8)dione derivative dye (9,10-ACD) in polar protic and aprotic solvents at 293 and 77 K. We are the first to report a new long-wavelength fluorescence band (LF, 670–710 nm) in both polar protic (methanol and ethanol) and aprotic solvents (N,N-dimethylformamide and dimethyl sulfoxide) at room temperature. This band is attributed to the high-lying singlet excited state (in the range 460–490 nm) responsible for the short-wavelength fluorescence band (SF). The LF is not found in low-polar (methylene chloride, polar aprotic (acetonitrile) and highly viscous protic solvents (glycerol) at 293 K as well as at 77 K in ethanol. This band arises as a result of deprotonation of a molecule in an excited state and emission of the resultant anion in the long-wavelength region. Analysis of the spectral and kinetic data for SF decay and the LF rise indicates a mechanism, in which the dye anion formation depends on the basicity of the polar solvent. Possible practical applications of this spectral effect in biology, medicine, and analytical chemistry are proposed.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-021-01261-w