Difference between revisions of "Electronic Coupling Between Orbitals"
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[[Main_Page#Molecular Orbitals|Return to Molecular Orbitals Menu]] | | [[Main_Page#Molecular Orbitals|Return to Molecular Orbitals Menu]] | | ||
[[Donors and Acceptors|Next Topic]] | [[Donors and Acceptors|Next Topic]] | ||
[[Image:Beta-adjacent.png|thumb| | [[Image:Beta-adjacent.png|thumb|200px|Adjacent p orbitals can interact]] | ||
We will discuss the electronic structure of π-conjugated organic molecules at various levels of complexity. π-conjugated molecules have a sigma electron framework and π electron framework. | We will discuss the electronic structure of π-conjugated organic molecules at various levels of complexity. π-conjugated molecules have a sigma electron framework and π electron framework. | ||
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Here we start at the simplest level that is basically derived from a Hückel Molecular Orbital approach in order to understand conjugated systems. | Here we start at the simplest level that is basically derived from a Hückel Molecular Orbital approach in order to understand conjugated systems. | ||
In this model, orbitals that are on atoms that are directly & | In this model, orbitals that are on atoms that are directly σ-bonded to one another and whose p-orbitals are in a plane can interact. This interaction is called the "electronic coupling" between the orbitals and has units of energy. | ||
In the Hückel approximation this energy is the same for all carbon p-orbitals that are adjacent to on another and is called Β. | In the Hückel approximation this energy is the same for all carbon p-orbitals that are adjacent to on another and is called Β. | ||
[[Image:Beta-nonadjacent.png|thumb|200px|Non- Adjacent p orbitals do not interact]] | |||
[[Image:Beta-nonadjacent.png|thumb| | |||
Revision as of 11:46, 19 May 2009
Return to Molecular Orbitals Menu | Next Topic
We will discuss the electronic structure of π-conjugated organic molecules at various levels of complexity. π-conjugated molecules have a sigma electron framework and π electron framework.
Here we start at the simplest level that is basically derived from a Hückel Molecular Orbital approach in order to understand conjugated systems.
In this model, orbitals that are on atoms that are directly σ-bonded to one another and whose p-orbitals are in a plane can interact. This interaction is called the "electronic coupling" between the orbitals and has units of energy.
In the Hückel approximation this energy is the same for all carbon p-orbitals that are adjacent to on another and is called Β.
