Solvatochromic study of 1,2-dihydroxyanthraquinone in neat and binary solvent mixtures

Excited state intramolecular proton transfer of 1,2-dihydroxyanthraquinone by femtosecond transient absorption spectroscopy

“…It is known that the energy barrier between the LE and PT tautomers of alizarin gets lower in polar solvents and that the PT emission dominates as solvent polarity increases [23]. The emission spectra of alizarin or its isomers can also be tuned by changing the excitation wavelength and concentration, which clearly shows that the excited state potential of alizarin is divided by a potential barrier between the LE and PT tautomers [23,24].…”

“…The emission spectra of alizarin or its isomers can also be tuned by changing the excitation wavelength and concentration, which clearly shows that the excited state potential of alizarin is divided by a potential barrier between the LE and PT tautomers [23,24]. Absorption and emission changes of alizarin were studied in several binary mixtures of solvents where the solvation and emissive properties of alizarin were tuned by changing polarity of the mixture gradually [23,25].…”

Investigations of absorption and emission spectral data in mixed liquid media. A short review of recent literature

“…[66,67], but the photophysics behavior in mixed solvents of new organo-siloxane compounds obtained including in their structure dihydroxyquinone and siloxane diamine derivatives has been recently reported in the literature [66,67]. The knowledge of intermolecular interactions between anthraquinone derivatives and environmental medium determines a better understanding of the solvation phenomena and the influence of these effects on further applications [66,67].…”

“…[66,67], but the photophysics behavior in mixed solvents of new organo-siloxane compounds obtained including in their structure dihydroxyquinone and siloxane diamine derivatives has been recently reported in the literature [66,67]. The knowledge of intermolecular interactions between anthraquinone derivatives and environmental medium determines a better understanding of the solvation phenomena and the influence of these effects on further applications [66,67]. The particularity of the studied anthraquinone derivative (poly[1,4-dihydroxyanthraquinoneimine-1,3-bis(phenylene-ester-methylene)]) by P. Pascariu et al [68] consists in its amphiphile nature conferred by the co-existence of highly hydrophobic tetramethyldisiloxane moiety alternating with polar ester-hydroxyazomethine one within the chain.…”

A novel fluorescent bisazomethine dye derived from 3-hydroxyquinoxaline-2-carboxaldehyde and 2,3-diaminomaleonitrile

“…The dual emission of fluorescent spectra may be due to excited state proton transfer nature of the hqcdmn [40]. The relative intensities of the long wavelength emission and short wavelength emission are strongly dependent on the nature of the solvent.…”