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Spectroscopic analysis explores the iodine complex in amylose, suggesting I5- as the primary polyiodide.
The structure of the blue-black iodine complex of amylose (the linear, helical component of starch) has been studied by resonance Raman and iodine-129 Mossbauer spectroscopy. It is concluded from these studies and parallel work on selected model compounds that the predominant polyiodide present is I5-. (Author)
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Teitelbaum et al. (1978) studied this question.
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