MOLECULAR-COMPLEXES OF SOME N-ARYLDITHIOCARBAMATES WITH PI-ELECTRON ACCEPTORS

Solid 1:1 CT complexes formed between some S-alkyl-N-aryldithiocarbama tes and pi-electron accepters (2,3-dichloro-5,6-dicyano-1,4-benzoquino ne (DDQ), tetracyanoethylene (TCNE), chloranil (CHL)) are synthesized and characterized. Spectral characteristics and stability of the compl exes are investigated and discussed in terms of donor molecular struct ure, pi-acceptor electron affinity, and solvent polarity. It is deduce d that the complexes are mainly of the n-pi type where the ground stat e wave function can be described primarily by the non-bonding structur e. Ionization potentials of the donors are estimated from the CT trans ition energies of their complexes.