Studies on intervalence transfer absorption

II. — Polynuclear complexes of Copper

Department of Chemistry, University College of Science, Calcutta-9, India.

Abstract

The optical intervalence transfer absorption has been located in Cu₄Cl₅(en)₂, Cu₃Br₄(NH₃)₄; Cu₃Br₄(en)₂ and Cu₂I₃(en)₂. Theoretical calculation from the experimental band width and band intensity data shows that there is very little electron delocalization from donor to acceptor in the ground state. The energy necessary to bring about intervalence transfer from donor to acceptor thermally has been estimated from the electronic conductivity data at different temperatures. The theoretical relation E_th = E_op/4 were found to be valid in these systems.