Bis Styryl Dye Research Articles

Energy transfer process in an unsymmetrical crown-containing bisstyryl dye incorporated in the cavities of CB[7] and 2-hydroxypropyl-β-CD

A supramolecular complex of an unsymmetrical crown-containing bisstyryl dye with CB[7] and 2-hydroxypropyl-β-CD can operate as an energy transfer system.

Self-sorting processes in a stimuli-responsive supramolecular systems based on cucurbituril, cyclodextrin and bisstyryl guests

We report a four-component mixture comprising bisstyryl dyes, HP-β-CD and CB[7] that undergoes self-sorting in aqueous solution based on ion–dipole, electrostatic, charge–transfer interactions, as well as the hydrophobic effect. The formation of 1:1 and 1:2 complexes between the bisstyryl guests and HP-β-CD, CB[7] has been confirmed by optical and NMR spectroscopy as well as ESI-MS data. The studied supramolecular systems are stimuli responsive. Thus, protonation of bisstyryl dye based on pyridine heterocyclic residue leads to the destruction of its complexes with HP-β-CD. Whereas, complex of the bisstyryl dye with CB[7] based on N-methylpyridinium moiety can be replaced by Ba2+ cation. The work demonstrates that HP-β-CD and CB[7] are molecular containers suitable for the creation of stimuli-responsive and self-sorting systems.

FRET-based metal ion sensing by a crown-containing bisstyryl dye

A ratiometric cation FRET system containing two binding centers demonstrates distinct fluorescence changes upon interaction with alkaline, alkaline earth and heavy metal cations.

Investigation of the photoinduced energy transfer in the supramolecular complexes of styryl dyes

Self-assembly of monostyryl dye of benzothiazole series with symmetric and asymmetric bisstyryl dyes based on dibenzo-18-crown-6 ether has been studied by optical and NMR spectroscopies. The photoinduced energy transfer between monoand bisstyryl dyes in supramolecular assembly has been analyzed. The cascade energy transfer in the supramolecular complex of monostyryl dye with asymmetric bisstyryl dye has been suggested.

Photosensitive Molecular Tweezers. Part 3. Synthesis and Homoditopic Complex Formation of a Bisstyryl Dye Containing Two Crown‐Ether Fragments with Diammonium Salts.

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Photosensitive molecular tweezers 3. Synthesis and homoditopic complex formation of a bisstyryl dye containing two crown-ether fragments with diammonium salts

A new molecular tweezers, viz., bisstyryl dye containing two 18-crown-6-ether moieties and one p-phenylenedimethylene spacer group, was synthesized. Complex formation of this dye and a model monostyryl dye with ions EtNH3 + and NH3 +(CH2)nNH3 + (n = 2−6) in MeCN was studied using spectrophotometry and 1H NMR spectroscopy. The homoditopic bisstyryl dye and diammonium salts form strong supramolecular complexes with pseudocyclic structure.

Sandwich-Type Complexes of Alkaline-Earth Metal Cations with a Bisstyryl Dye Containing Two Crown Ether Units

The formation of complexes between a bisstyryl dye containing two benzo-15-crown-5 ether groups, 2, and Mg2+, Ca2+, Sr2+, and Ba2+ ions was studied in acetonitrile solution by using a spectrophotometric approach. In contrast to its monostyryl analogue 1, which shows a rather low cation-binding selectivity, the bisstyryl dye 2 selectively binds the Sr2+ and Ba2+ ions because of formation of intramolecular sandwich complexes. Alkaline-earth metal cations induce substantial blue shifts of the absorption maximum of 1 and 2, particularly in the case of sandwich complex formation. The emission behavior of 1 and 2 and their Ba2+ complexes in acetonitrile solution has also been studied. In both cases, complex formation leads to a blue shift of the fluorescence maximum and a decrease in the emission quantum yield. The fluorescence decay is monoexponential for the complex of 1 and biexponential for that of 2. The longer-lived fluorescence component, which corresponds to the lower-energy band in the steady-state spectrum, is assigned to an intramolecular excimer state.