Photoswitchable molecular pincers: synthesis, self-assembly into sandwich complexes and ion-selective intramolecular [2+2]-photocycloaddition of an unsaturated bis-15-crown-5 ether
- 1 January 1999
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 7,p. 1323-1330
- https://doi.org/10.1039/a902151e
Abstract
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.Keywords
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