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Synthesis of sulfoquercetin and studies of its structure and nonlinear properties have been carried out. Using quantum-chemical simulations, С and HSQC NMR spectrometry, FTIR spectroscopy it was shown that a sulphonic group occurs in C8 location of quercetin. Molecular first hyperpolarizability of the obtained 8-sulfoquercetin was studied. It was shown that 8-sulfoquercetin can be used for creation the new polymer NLO materials on its basis.

The Sulfonation of 3,5,7,3’,4’-Pentahydroxyflavone and Non-Linear-Optical Activity of its Sulfonic Derivatives