The interest in functional supramolecular systems for the design of innovative materials and technologies, able to fundamentally change the world, is growing at a high pace. The huge array of publications that appeared in recent years in the global literature calls for systematization of the structural trends inherent in the formation of these systems revealed at different molecular platforms and practically useful properties they exhibit. The attention is concentrated on the topics related to functional supramolecular systems that are actively explored in institutes and universities of Russia in the last 10–15 years, such as the chemistry of host–guest complexes, crystal engineering, self-assembly and self-organization in solutions and at interfaces, biomimetics and molecular machines and devices.
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The stability of europium(III) complexes with benzocrown ether derivatives 2−4 containing carboxylic functions with methylene spacers of
different length was found to vary surprisingly little. In sharp contrast, the hydrolytic activity of these catalysts against bis(p-nitrophenyl)phosphate (BNPP) varied by a factor of 30. The results show for the first time the efficiency of the carboxylic group as cofactor in phosphate
ester hydrolysis, which until now was established only in some enzmyes. Other than with BNPP, the hydrolysis with plasmid DNA (nicking
experiments) showed no rate enhancement.
New styryl dyes containing the benzodithia-18-crown-6 fragment have been synthesized and their photoisomerization reactions and complexes with Hg2+ and Ag + cations have been investigated by steady-state electronic and resonance Raman spectroscopy. (4-Formy1benzo)dithia-18-crown-6, N-carboxypropyl-and N-carboxybutyl-2-methylbenzothiazolium bromides have also been prepared as intermediates for the styryl dye syntheses. Changes in vibrational resonance Raman spectra observed on complexation with Agf and HgZf cations or on variation of solvent polarity have been correlated with changes in the UV-VIS absorption maxima of the dyes. Preliminary assignments of the observed Raman bands to particular vibrations are made.
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