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SM ISO690:2012 LYAPUNOV, Alexander, AUTOR, Nou, ZUBATIUK, Roman, FONARI, Marina. New fluorenonocrownophanes containing azobenzene: Synthesis, properties and interaction with paraquat. In: Journal of Inclusion Phenomena and Macrocyclic Chemistry, 2015, vol. 81, nr. 3-4, pp. 499-508. ISSN 1388-3127. DOI: https://doi.org/10.1007/s10847-015-0484-0 |
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Journal of Inclusion Phenomena and Macrocyclic Chemistry | |
Volumul 81, Numărul 3-4 / 2015 / ISSN 1388-3127 /ISSNe 1577-1111 | |
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DOI:https://doi.org/10.1007/s10847-015-0484-0 | |
Pag. 499-508 | |
Rezumat | |
New crownophanes containing 2,7-dioxy-fluorenone and 4,4′-azobiphenoxy moieties linked by di-, tri-, tetra-, and pentaethylene glycol residues were synthesized. Just in case of obtaining largest crownophane with pentaethyleneglycol linkers, the dimeric cyclization product was also isolated in low yield. Obtained crowno-phanes, according to 1H NMR spectral data exist in conformations with closed intramolecular cavity in solution. Photoinduced E-Z isomerization of crownophane containing triethylene glycol linkers were investigated. The azobenzene fragment inclusion into crownophane reduces the photoisomerization rate compared to model 4,4′-dimethoxyazobenzene. In all the obtained crowno-phanes according to NMR, UV-Vis and X-ray data 4,4′-azobiphenoxy fragment is in E-configuration in solution as well as in the solid state. Crystal packing of all crownophanes has distinct feature-stacking arrangement of fluorenone moieties probably due to electrostatic dipole-dipole interactions. The formation of pseudorotaxane-type host-guest complexes of these crownophanes with paraquat dication was detected by FABMS and 1H NMR spectroscopy. UV-Vis spectra show no significant changes upon complex formation. |
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Cuvinte-cheie azobenzene, Crownophane, Fluorenone, Host-guest complex, Photoisomerization, X-ray |
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