On the Origin of the Blue Color in The Iodine/Iodide/Starch Supramolecular Complex.

ABSTRACT: The nature of the blue color in the iodine-starch reaction is still a matter of debate. Some textbooks still invoke charge-transfer bands within a chain of neutral I₂ molecules inside the hydrophobic channel defined by the interior of the amylose helical structure. However, the consensus is that the interior of the helix is not altogether hydrophobic-and that a mixture of I₂ molecules and iodide anions reside there and are responsible for the intense charge-transfer bands that yield the blue color of the "iodine-starch complex". Indeed, iodide is a prerequisite of the reaction. However, some debate still exists regarding the nature of the iodine-iodine units inside the amylose helix. Species such as I₃^-, I₅^-, I₇

SUBMITTER: Pesek S 

PROVIDER: S-EPMC9784209 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature