Abstract
The optical absorption spectra of thin films of α-cyclodextrin-KI-I 2, α-cyclodextrin-HI-I 2, (α-cyclodextrin) 2-LiI 3-I 2, amylose-iodine, and (coumarin) 4-KI-I 2 complexes were studied. The absorption profiles are deconvoluted into four or five gaussian bands which correspond to the electronic transitions along the iodine chains composed of I 3 - and I 2 units. First-derivative results, independent of background absorption and absolute intensities, are found to exhibit in each case one or two more bands than the ordinary spectra. The observed transitions are regarded as evidence of the presence of I 3 - and I 2 units along the iodine chains. Correlations between the electronic conduction mechanism and multiphonon processes which broaden the bare electron gaussians are discussed.
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