АННОТАЦИЯ
Bis-crown-containing styryl dyes (E,E)-2a,b having the structure and properties of molecular pincers were synthesised. In acetonitrile solution, dye (E,E)-2b is able to form intramolecular sandwich complexes with Ca2+ and Ba2+ cations. These complexes undergo E-Z-photoisomerisation and intramolecular stereoselective [2+2]-photocycloaddition to afford cyclobutane derivatives 6a,b, whose structures were studied by 1H NMR spectroscopy. Molecular-mechanics and semiempirical quantum-chemical calculations were performed to interpret experimental data.
ЦИТАТА
Photoswitchable molecular pincers: synthesis, self-assembly into sandwich complexes and ion-selective intramolecular [2+2]-photocycloaddition of an unsaturated bis-15-crown-5 ether / S.P. Gromov, O.A. Fedorova, E.N. Ushakov, A.V. Buevich, I.I. Baskin, Y.V. Pershina, B. Eliasson, U. Edlund, M.V. Alfimov // Journal of the Chemical Society. Perkin Transactions 2. – 1999. – Т. 999. – № 7. – P. 1323-1330
