How Does the Conjugated System of Chlorophyll Affect Photon Absorption?

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The conjugated system of chlorophyll, characterized by alternating single and double bonds, facilitates photon absorption by allowing electrons to be more easily excited due to equal electronegativity among carbon atoms. The length of the conjugated system plays a critical role, as a longer conjugated system can lower the energy gap between electronic states, making it easier for photons to be absorbed. The relationship between bond types and the overall length of the conjugated system affects the energy states, similar to the concept of a particle in a box where energy spacing changes with box length. This structural aspect enhances chlorophyll's ability to capture light energy effectively. Understanding these principles is essential for grasping how chlorophyll functions in photosynthesis.
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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?
 
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