Infrared Spectra of π-π Molecular Complexes

Department of Chemistry, University College of Science, 92 Acharya Prahalla Chandra Road, Calcutta-700 009 Manuscript received 14 March 1985, accepted 30 October 1986 The infrared spectra of π—πmolecular complexes of aromatic hydrocarbons with tetrahalo-p-benzoquinones were investigated. The spectra show a new band at 470 cm-1 which may be associated with the overtone of the inter-molecular stretching vibra­tions of the donor and acceptor molecules.