Substituent Effects on Molecular Ionization Potentials XIII. Copper Acetylacetonates

In this paper we report the first correlation of molecular ionization potentials of metal coordination complexes with the substituent constants. Recently we have shown that the ionization energies of the alcohols,1 ethers,2 amines,3 thiols,4 thioethers,5 disulfides,6 alkenes,7 alkynes,8 alkyl halides,9 carboxylic acids,10 ketones,11 nitroalkanes,12 and nitriles12 are linear functions of the inductive substituent constants, [sgrave]I, and the polar substituent constants, [sgrave]∗. This permits one to calculate by means of a simple single-parameter equation, to a good approximation, values of the ionization potentials of compounds which yield a low abundance of the primary cation radical, or are difficult to obtain in a purified state, or vaporize only with decomposition.