How entering of triiodide ion into starch coils change electronic structure of iodine? iodine is post-transitional element, so , can ligand field theory be applied here? How the electronic transition of outermost p orbital produce visible color?
Please explain in simple terms, since my knowledge on electronic structure of complex ions , macromolecular ligands, ligand field theory and quantum chemistry are rather limited.
Check here: https://www.chemistryviews.org/details/education/10128441/Why_Does_Iodine_Turn_Starch_Blue.html and the references cited on the page
Or read about the charge-transfer complexes, e.g. here: https://en.wikipedia.org/wiki/Charge-transfer_complex (the simplest explanation)
I agree with Bartosz Trzaskowski about the charge transfer complex between amylose and (poly)iodides anions. Research has been made to characterize completely this structure : doi : 10.1002/anie.201601585
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