Synthesis and spectroscopic characterization of piperidine/I-2 charge-transfer complex in different chlorinated organic solvents

The charge-transfer (CT) complex formed between piperidine (Pip) as donor and iodine (I-2) as a-acceptor was studied spectrophotometrically. The synthesis and characterization of the piperidine CT-complex of iodine, {[}(Pip)(2)]I+.I-3(-), was described. This complex was readily prepared by the reaction of Pip with I, in CHCl3 solvent. Infrared spectra (mid-IR and far-IR), UV-Vis techniques and elemental analyses were used to characterize the piperidine/I-2 charge-transfer complex. Benesi-Hildebrand's method and its modifications were applied to the determination of the association constant (K) and the molar absorption coefficient (epsilon).