Anastasia I. Ershova, Ilzia I. Khakimova, Mikhail Yu. Ievlev, Oleg V. Ershov
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2-Thiopyridone-based stilbazoles: Synthesis, photo-physical properties and sensing of Hg(II) and Cd(II) ions
A method of preparation of new representatives of donor-acceptor stilbazoles based on pyridine-2-thione containing a cyano group and a trifluoromethyl moiety in the acceptor part of the molecule was developed. The synthesized stilbazoles exhibited pronounced fluorescence, with quantum yields up to about 15 % significantly improved compared to traditional thioxonicotinonitriles, which typically lack such properties. The emission turned out to be strongly dependent on the tautomeric equlibrium in the solution that was studied using both computational methods and comprehensive spectroscopic analysis. Solvato(fluoro)chromism and the influence of the substituent on the spectral characteristics of the compounds were also investigated. It was established that the emission maximum could be tuned from 418 to 630 nm covering almost the entire visible spectrum. The design of stilbazoles enhanced their photophysical properties making them suitable candidates for environmental monitoring or biological sensing. As a result a new chemosensor was developed demonstrating high selectivity for the detection of micromolar concentration of mercury(II) ions (LoD 1.34 μM) and submicromolar concentration of cadmium(II) ions (LoD 0.875 μM) in aqueous media.
期刊介绍：
Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied.
Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media.
The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.
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