Effect of arrangement of the styryl fragment on the optical properties and complexation of mono-and bis(styryl)-substituted N-methylpyridinium perchlorates containing benzo-15-crown-5 ether moieties
Spectroscopic study of mono- and bis(styryl) dyes of the pyridinium series containing azathiacrown ether residue
作者:E. V. Tulyakova、O. A. Fedorova、Yu. V. Fedorov、G. Jonusauskas、A. V. Anisimov
DOI:10.1002/poc.1349
日期:2008.5
Phenylazathiacrown ether monostyryl and bis(styryl) dyes were synthesized and their complex forming ability was evaluated in acetonitrile by absorption and fluorescence spectroscopy. It was found that dyes are sensitive to the presence of H+ and Hg2+, Ag+, Cu2+ cations. The most stable complexes were formed with mercury. Stability constants and UV–Vis spectra of complexes defined stoichiometry were
The invention pertains to a fluoroelastomer composition [composition (C)] comprising: —at least one fluoroelastomer [fluoroelastomer (A)]; —at least one basic compound [base (B)]; —at least one pyridinium-type salt [salt (P)] having at least two groups in ortho or para position to the quaternized nitrogen bearing a reactive hydrogen atom.
The invention pertains to a fluoroelastomer composition [composition (C)] comprising: - at least one fluoroelastomer [fluoroelastomer (A)]; - at least one basic compound [base (B)]; - at least one pyridinium-type salt [salt (P)] having at least two groups in ortho or para position to the quaternized nitrogen bearing a reactive hydrogen atom.