Why is iodine colour

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Advanced search. Skip to main content Thank you for visiting nature. Ratcliff , J. Pastalan , K. The binding energies of three iodine complexes. Journal of Quantitative Spectroscopy and Radiative Transfer , 42 6 , Sension , Herbert L. Comparison of experiment and theory for the resonance Raman spectrum of I 2 in solution. The Journal of Chemical Physics , 85 7 , Bruno , M. Caselli , M. Della Monica. A spectrophotometric study of the hexamethylphosphotriamide—iodine complex.

Inorganica Chimica Acta , 10 , Photochemistry and Photobiology , 9 2 , Two new color tests for determining the presence of arylmetallics. Journal of Organometallic Chemistry , 8 3 , Hiskey , F. Journal of Pharmaceutical Sciences , 55 2 , Order from Chaos. Science , , Jander , G. Angewandte Chemie , 73 2 , Andrews , R. Molecular Complexes of Halogens.

Interaction between Sulfur Dioxide and Polar Molecules. Systems Containing Ethanol, and Benzene or Hydroquinone.

The Journal of Chemical Physics , 26 5 , Iodine Complexes in Inert Solvents. See the graphic below, which show four views in turning from a the side to an end view. Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil. Iodine - KI Reagent: Iodine is not very soluble in water, therefore the iodine reagent is made by dissolving iodine in water in the presence of potassium iodide.

This makes a linear triiodide ion complex with is soluble that slips into the coil of the starch causing an intense blue-black color. Introduction Amylose forms a colloidal dispersion in hot water whereas amylopectin is completely insoluble. Chemical Test for Starch or Iodine Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine.