TULYAKOVA, E. V.; FEDOROVA, O. A.; FEDOROV, Y. V.; JONUSAUSKAS, Gediminas; ANISIMOV, A. V.

doi:10.1007/s11172-007-0341-4

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TULYAKOVA, E. V.
Department of Chemistry, Lomonosov Moscow State University

FEDOROVA, O. A.
Department of Chemistry, Lomonosov Moscow State University

FEDOROV, Y. V.
Photochemistry Center

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Russian Chemical Bulletin. 2007-11, vol. 56, n° 11, p. 2166-2174

Springer Verlag

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Using 1H NMR spectroscopy and steady-state and time-resolved electronic spectroscopy, the optical properties of mono-and bis(styryl) pyridinium perchlorates and their complexes with Mg2+, Ba 2+ cations were studied. The stability constants of the complexes were determined using spectrophotometric titration. The formation of inclusion complexes for Mg2+ and sandwich type complexes for Ba2+ results in fluorescence enhancement and increases the lifetimes of the excited states of the initial bis-styryl ligands. The variation of position of the styryl fragment in the pyridinium aromatic ring gives rise to photochromic crown ethers with different optical and photophysical characteristics and is also an easy route to bis(crown-ethers) of symmetrical and unsymmetrical structure.< Leer menos

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bis(crown ether)

styryl dyes

benzo-15-crown-5 ether

Complex formation

E-Z photoisomerization

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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

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