Molecular complexes of crown ethers, part 6: Complexes of Cryptand (2,2,2)and Kryptofix 5 with some acceptors

The UV-Visible spectra of Cryptand (2,2,2) and Kryptofix 5 as donors, and T CNE (tetracyanoethylene), DDQ (2,3-dichloro-5,6- dicyano-1,4 benzoquinone) and PA (picric acid) as accepters were studied. Charge transfer (CT) spectr a were obtained for these systems. It was found that potassium halides have little effect on the spectra. The major process was due to an electron tra nsfer from the donor to the acceptor. This revealed itself in very high con ductivity values for the CT solutions in comparison to that of the donor or the acceptor solutions. The infrared and proton NMR spectra of the complex es indicated a strong interaction between the donor and the acceptor.