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1 April, 18:58

Suppose that you are a color chemist and have been asked to intensify the color of a dye without changing the type of compound and that the dye in question is a polyene. (a) Would you choose to lengthen or to shorten the chain? (b) Would the modifi cation to the length shift the apparent color of the dye toward the red or the blue?

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  1. 1 April, 20:08
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    The chemist needs to increase the chain length to make the color more vivid. Increased polyene chain length will reduce the frequency and raise the wavelength to purple.

    E = hc / λ

    with the modification will shift the color to red. The chain lengthens decreases energy and wavelength when the chain is reduced and increases light absorption energy, which lowers the diameter of the molecule
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