How Does the Conjugated System of Chlorophyll Affect Photon Absorption?

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Discussion Overview

The discussion centers around the role of the conjugated system in chlorophyll and its impact on photon absorption, exploring theoretical and conceptual aspects related to molecular structure and energy states.

Discussion Character

  • Conceptual clarification, Homework-related, Exploratory

Main Points Raised

  • One participant questions how the alternation of single and double bonds in chlorophyll facilitates photon absorption, noting the equal electronegativity of carbon atoms.
  • Another participant suggests considering the "length" of the conjugated system as a factor in photon absorption.
  • A different participant seeks clarification on whether double bonds make the molecule shorter than single bonds and how that relates to photon absorption.
  • Further clarification is provided that the discussion pertains to the system of bonds rather than individual bonds.
  • One participant prompts a connection to the "particle in a box" model, asking how changes in the length of the box affect the spacing of energy states.

Areas of Agreement / Disagreement

The discussion contains multiple viewpoints and remains unresolved, with participants exploring different aspects of the conjugated system and its implications for photon absorption.

Contextual Notes

Participants have not reached consensus on the specific mechanisms by which the conjugated system influences photon absorption, and there are unresolved questions regarding the relationship between bond length and energy states.

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?
 

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