Abstract
Charge transfer (CT) complexes formed through the reaction of (E)-dicyclopropylmethylene(2,5-dimethyl-3-furylethyldiene)succinic anhydride as a donor and some π-acceptors namely, 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), p-chloranil (CHL) and chloranilic acid (CNA) were prepared. The structure of the synthesized complexes were characterized by elemental analysis, IR and electronic absorption spectra. Spectral characteristics of the CT complexes were discussed in terms of donor molecular structure and π-acceptor electron affinity. Ionization potential of the donor was estimated from the CT transition energies of its complexes.
Irradiation of the ground state electron donor-acceptor complexes of the titled fulgide with DDQ and CNA, the CT band observed at 482 and 485 nm are shifted to longer wavelengths. This may be due to the structural change of the donor due to the cyclization process.