Spectroscopic studies on the reaction of iodine with the mixed oxyten-nitrogen cyclic base 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo{[}8,8,8]hexacosane

The interaction of the mixed oxygen-nitrogen cyclic base, 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo{[}8,8,8] hexacosane (HOD-ABCHC) with iodine as a \σ-acceptor has been studied spectrophotometrically at room temperature in CHCl3. The spectra indicate the formation of the triiodide ion, I-3(-) and the complex was formulated as {[}(HODABCHC)I](+).I-3(-) in good agreement with elemental analysis, photometric titration plots based on the characteristic absorption bands of I-3(-) ion around 292 and 360 nm and infrared measurements. Far infrared spectrum shows the characteristic bands for I-3(-) ion at 154, 105 and 56 cm (-1) are assigned for the v(s)(I-I), v(s)(I-I) and \δ(I-3(-)), respectively.