Charge transfer complexes between halogens and pyridines. Part 4.—Effect of the acid strength of the acceptors

Abstract

Charge transfer equilibria between bromine, iodine, iodine chloride and iodine bromide as acceptors and various meta and para-substituted pyridines as donors have been studied spectrophotometrically in carbon tetrachloride at 30°C. Formation constants of the complexes have been correlated with Hammett's substituent constants, ionization constants of the donors and acid strength of the acceptors. Correlations with intermolecular and/or interhalogen spectral parameters are also discussed.