Objective
The goals of this project are to investigate regio and stereoselectivity of reversible [2+2]-photocycloaddition in supramolecular structures and to explore new types of photoswitched receptors and their interconversion.
The objects chosen for the investigations are novel unsaturated crown ethers (UCE). Four types of UCE will be synthesized and studied. These will be dyes or stilbene-like molecules with one C=C bond. They may congregate into supramolecules with or without metal cations. When metal cations are absent the assembly may be carried out with an alkylammonium substituent in the molecules, that can bind to the 18-crown-6 fragment. Research will be conducted on regio- and stereoselectivity of photocycloaddition reactions by NMR methods. The quantum yield of [2+2]-photocycloaddition for dimeric complexes of UCE will be measured by steady-state electronic spectroscopy.
It is planned to determine molecular design of photo- and thermoswitched molecular devices based on UCE and reaction products by means of a heuristic approach and computer simulations. Research on "host-guest" type complexation of new supramolecular receptors (cyclobutane derivatives) and the study of the thermodynamics and mechanisms of self-assembling UCE into supramolecules upon the complexation is also planned. Structures of UCE dimeric complexes will be investigated by NMR method. The investigation of UCE dimeric complexes by time-resolved electronic spectroscopy will be performed in order to obtain information about the mechanisms and dynamics of photoprocesses in these supramolecular structures. Results will be published in scientific journals and presented on scientific conferences.
Topic(s)
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90187 Umeå
Sweden