How Does the Conjugated System of Chlorophyll Affect Photon Absorption?

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obiwankenobi
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Homework Statement


Why does the conjugated system (alternance of single and double bonds) of chlorophylles help with photon absorption?

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! [/B]
 

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Think in terms of the "length" of the conjugated system.
 
Double bonds make the molecule shorter than single bonds? How does that help with photon absorption?
 
Of the SYSTEM of bonds (plural).
 
Thanks! But how does that relate to photon absorption?
 
Have you studied the particle in a box? How does the spacing of the energy states change when the length of the box changes?