Spectroscopic features of diphenylaryethylenes and arylpolyenes having substituted groups in pairs

Abstract

The spectral and optical characteristics of 4,4′ substituted stilbene and diphenylpolyenes were determined depending on the nature of the substituents. It is established that as a result of the dipole-dipole interaction of Van der Waals forces and the entrainment of the electron energies of molecules in the studied compounds, a botochromic shift of the adsorption and luminescence spectra is carried out. It is determined that for 4,4′ substituted arylethylene molecules with protonadonnor substituted groups, high values of the quantum yield of luminescence are observed, which are recommended for their use as fluorescence probes.

Spectroscopic studies of self-assembly α-carotenoids in binary solvents

“…Analogous constancy of the electron spectra was previously observed in solutions of arylethylenes, aryl polyenes and food dyes. At the same time, the observed constancy of the electron spectra was attributed to the monomeric molecules of the studied compounds [17]. Based on these arguments, we concluded that at a concentration of 10 -5 ÷ 5 ×10 -5 mol, the "α"-carotenoid molecules will be in a monomeric state.…”

“…Carotenoids are natural pigments, they include more than a hundred natural compounds [1]. From the analysis of the literature data, it was determined that there is a relationship between the structures of caratinoids and the raman spectra of light.…”

Application of spectroscopy to develop methods for obtaining carotenoid-containing dyes

“…The authors [9,10] proposed a method for obtaining a mixture of carotenoids from dried plants by extraction using acetone or other ketone solvents. The authors [11,12] have developed a method in which dried plants are thermally treated for 1.9-07 hours, in which carotenoids undergo destruction, resulting in a poor-quality final product.…”

“…Spectroscopy makes it possible to obtain not only individual carotenoids, but also their derivatives. These studies make it possible to obtain pigments with the necessary chromaticity and specrally optical characteristics [14]. By the authors [15,16] a method for obtaining individual carotenoids has been developed.…”

“…The carotenoid group includes about 65-70 natural pigments. Carotenoids are found in most plants (with the exception of some fungi) and probably in all animal organisms [1][2][3].The concentration of carotenoids is almost always very low. In green leaves, it is about 0.07-0.2% per dry substance [4].…”