New fluorenonocrownophanes containing azobenzene: Synthesis, properties and interaction with paraquat
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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

New fluorenonocrownophanes containing azobenzene: Synthesis, properties and interaction with paraquat

DOI:https://doi.org/10.1007/s10847-015-0484-0

Pag. 499-508

Lyapunov Alexander1, Autor Nou1, Zubatiuk Roman2, Fonari Marina3
 
1 A.V. Bogatsky Physico-Chemical Institute of the NAS of Ukraine,
2 SSI “Institute for Single Crystals”, National Academy of Sciences of Ukraine,
3 Institute of Applied Physics, Academy of Sciences of Moldova
 
 
Disponibil în IBN: 29 mai 2023


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. 

Cuvinte-cheie
azobenzene, Crownophane, Fluorenone, Host-guest complex, Photoisomerization, X-ray