Tetrahydrofuran complexes donor-acceptor

By way of contrast, the donor-acceptor complex of tetrahydrofurane and TCNE in solution shows a reversible photoresponse and ESR signal on irradiation in the charge-transfer band. This is attributed to a reversible... 

Among the systems with chemical different donor and acceptor molecules, the photocopolymerization between maleic anhydride (MSA), which functions as an acceptor, and electron-rich monomers has been widely investigated. As donor monomers such compounds as styrene (Sty) [19-29], cyclohexene [30], N-vinylcarbazole [31], 2-vinyl naphthalene [32], vinyl acetate [33], 2.4.8.10-tetra-oxaspiro[5.5]undecan [34] and phenyl glycidyl ether (2,3-epoxypropyl phenyl ether, PGE) [35] have been used. In all the above cases, using high concentrations of both monomers, the absorption of the CT has been obtained in various solvents. Thus, with spectroscopic methods the complex formation constant Kct can be calculated (e.g., MSA-cyclohexene Kcl = 0.0681 mol -1 [33], MSA-tetrahydrofuran Kct = 0.331 mol-1 [36]), and a selective excitation of the CT is possible in many cases. 

Irradiation of an acceptor monomer-electron donor charge transfer complex initiates anionic polymerization in the case of nitroethylene-tetrahydrofuran ( ) and radical polymerization in the case of methyl methacrylate-triphenylphosphine (6). 

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