Sigma and Pi bonding - PowerPoint PPT Presentation

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Sigma and Pi bonding

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  1. Sigma and Pi bonding

  2. Sigma (σ) Bond Sigma bond is in the same axis as the axis between the nuclei of bonding atoms. The sp3 term refers to a hybrid (combination) of one s-orbital and 3 p-orbitals.

  3. sp3Hybridisation

  4. Shape of the Hybrid Orbitals

  5. The Tetrahedron The tetrahedral shape is the most efficient way to arrange the four sp3 orbitals.

  6. Sigma Bonding in Methane The sigma bond is formed when the electron in the sp3 orbital joins with another electron in a s-orbital. Eg. Methane

  7. sp2Hybridisation We now have hybridisation of one s-orbital and two p-orbitals.

  8. sp2Hybridisation Becomes Pi Bond Become sigma bonds

  9. Pi (π) Bonding in Ethane

  10. Pi (π) Bonding in Ethane The bond forms above and below the axis of bonding

  11. The Pi Bond Cannot Rotate Build a model to show the abilty of the single bond to rotate. Build a model to show the inability of the double bond to rotate.