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Normal modes and structure of iodine in the starch–iodine complex

✍ Scribed by Hyunyong Kim

Publisher
Wiley (John Wiley & Sons)
Year
1982
Tongue
English
Weight
773 KB
Volume
21
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

Normal modes of a linear array of iodine atoms with various repeat units, (I), (II), (II), and (I), have been calculated. The four resonance Raman bands (158, 107, 57, and 27 cm^−1^) observed with the starch–iodine complex can be assigned to the symmetric modes of either the (II)~n~ or (I)~n~ linear chain. However, the nature of the valence force fields of these two structures is very different: the former consists of a weakly coupled linear chain of (I) structure, while the latter, (I)~n~, is a tightly bound chain approaching equidistant iodine spacings. The nearly equivalent I‐I stretching force constants obtained in the present normal mode analysis of the (I)~n~ structure is supported by the results of previous x‐ray and I‐129 Mössbauer effect measurements. A numerical method of calculating the frequency dispersions of one‐ and two‐dimensional molecular arrays is given.

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