Abstract
We describe the synthesis and effect of complexation on photochemical E (trans) to Z (cis) isomerization of lariat azacrown ethers. Lariat azacrown ethers-Ca2+ complexes are characterized by UV-Vis, 1H-NMR and fluorescence techniques. Photostationary state composition of E-Z isomers upon irradiation under direct excitation and complexation with Ca(ClO4)2, quantum yield of photoisomerization, and fluorescence properties are described. Anomalous increase in the quantum yields were observed for lariat azacrown ether-Ca2+ complexes. Fluorescence studies indicated that the highly polarized/charge transfer nature of the singlet excited state is involved in E (trans) to Z (cis) isomerization process.
Keywords: lariat azacrown ethers, Lariat azacrown ethers-Ca2+ complexes, UV-Vis, NMR, fluorescence techniques, E-Z isomers, photoisomerization
Call for Papers in Thematic Issues
Catalytic C-H bond activation as a tool for functionalization of heterocycles
The major topic is the functionalization of heterocycles through catalyzed C-H bond activation. The strategies based on C-H activation not only provide straightforward formation of C-C or C-X bonds but, more importantly, allow for the avoidance of pre-functionalization of one or two of the cross-coupling partners. The beneficial impact of ...read more
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