SPECTROSCOPIC STUDY OF THE COMPLEXATION OF IODINE WITH 8-TETRAPHENYL-2,4,6,8-TETRAAZABICYCLO[3.3.0]OCTANE

The charge-transfer complex formation between iodine and 8-tetraphenyl -2,4,6,8-tetraazabicyclo[3.3.0]octane (TPTABO) has been studied spectr ophotometrically in chloroform solution. The resulting 2:1 complex is formulated as (TPTABO.I+)I-3(-) as it is also characterized by IR and NMR spectroscopy. The formation constant was evaluated from the non-li near least-squares fitting of the absorbance-mole ratio data. The enth alpy and entropy of the complex formation reaction were determined fro m the temperature dependence of the formation constant. The rate const ant and activation parameters E-a, Delta H# and Delta S# were also cal culated.