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Conjugated system of chlorophylles

  1. Feb 3, 2016 #1
    1. The problem statement, all variables and given/known data
    Why does the conjugated system (alternance of single and double bonds) of chlorophylles help with photon absorption?






    3. The attempt at a solution
    Since two carbon atoms are equal in electric negativity, no one atom hogs the electrons. In this way, it is easier for photons to excite the electrons. However, I don't understand why single or double bonds would make a difference.

    Thanks!
     
  2. jcsd
  3. Feb 3, 2016 #2

    Bystander

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    Think in terms of the "length" of the conjugated system.
     
  4. Feb 3, 2016 #3
    Double bonds make the molecule shorter than single bonds? How does that help with photon absorption?
     
  5. Feb 3, 2016 #4

    Bystander

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    Of the SYSTEM of bonds (plural).
     
  6. Feb 3, 2016 #5
    Thanks! But how does that relate to photon absorption?
     
  7. Feb 4, 2016 #6

    Ygggdrasil

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    Have you studied the particle in a box? How does the spacing of the energy states change when the length of the box changes?
     
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