Electronic Structure of the Amylose-Iodine Complex

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Abstract
The electronic structure of the amylose‐iodine complex is studied on a different basis from that of the previous Stein‐Rundle theory. First, the electron transfer from amylose oxygen to the iodine molecule is discussed from the viewpoint of Mulliken's intermolecular charge‐transfer spectra. Then it is shown that the consideration of electronic interaction between neighboring iodine molecule ions and bond formation between oxygen and iodine gives a reasonable interpretation of bond number and absorption spectra. Last, the quantitative discussion of absorption spectra is performed by the application of the free‐electron model to the system (I4—) which we consider to be the elemental unit in the polyiodine chain. The agreement between predicted and observed results is satisfactory if one considers the extreme simplification of the model.