Abstract
New crownophanes containing 2,7-dioxyfluorenone 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 crownophanes, 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 crownophanes 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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This article is dedicated to the memory of our colleagues whose life came to an end: Prof. Oleg V. Shishkin and Dr. Mark M. Botoshansky, who took active part in this research, as well as Prof. Nikolay G. Lukyanenko who was supervisor of this work.
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Lyapunov, A., Kirichenko, T., Kulygina, C. et al. New fluorenonocrownophanes containing azobenzene: synthesis, properties and interaction with paraquat. J Incl Phenom Macrocycl Chem 81, 499–508 (2015). https://doi.org/10.1007/s10847-015-0484-0
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DOI: https://doi.org/10.1007/s10847-015-0484-0