Spectral studies on charge transfer complexes between (E)-dicyclopropylmethylene (2,5-dimethyl-3-furylethyldiene)succinic anhydride and π-acceptors

Charge transfer (CT) complexes formed through the reaction of (E)-dicyclopropyl-methylene(2,5-dimethyl-3-furylethyldiene)succinic anhydride as a donor and some pi-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 pi-acceptor electron affinity. Ionization potential of the donor was estimated from the CT transition energies of its complexes.