CHARGE-TRANSFER COMPLEXES REVISITED

Electron donors such as diethyl ether, benzene, and electron accepters such as halogens combine to form charge transfer (C-T) complexes, A C -T complex gives a unique absorption band generally in the UV-visible region, which is not present in the spectrum of the donor or the accep tor, A new approach to study a C-T complex is to isolate the complex i n the gaseous state and find its occupied orbital energies from UV pho toelectron spectroscopy (UVPES), excited states from electron energy l oss spectroscopy (EELS) and compare the orbital energies from ab-initi o molecular orbitals (MO) calculations, Combined use of UVPES, EELS an d MO calculations provides a complete molecular description of a C-T c omplex, Bonding,and antibonding orbitals responsible for hv(C-T) absor ption in a C-T complex can be identified, In this article we describe this new approach to study C-T complexes.