How Does the Conjugated System of Chlorophyll Affect Photon Absorption?

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SUMMARY

The conjugated system of chlorophyll, characterized by alternating single and double bonds, significantly enhances photon absorption due to its ability to facilitate electron excitation. The equal electronegativity of carbon atoms within this system prevents electron localization, allowing for more efficient photon interaction. The length of the conjugated system directly influences the energy states of the electrons, akin to the "particle in a box" model, where shorter conjugated lengths correlate with increased energy state spacing, optimizing photon absorption efficiency.

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  • Understanding of conjugated systems in organic chemistry
  • Knowledge of photon interactions with electrons
  • Familiarity with the particle in a box model in quantum mechanics
  • Basic principles of molecular orbital theory
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  • Research the role of conjugation in organic compounds
  • Explore the quantum mechanics of electron excitation
  • Study the effects of molecular geometry on photon absorption
  • Investigate the applications of chlorophyll in photosynthesis and energy conversion
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Students and researchers in chemistry, biochemistry, and physics, particularly those interested in photochemistry and the molecular mechanisms of 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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