Rotation about single and multiple bonds

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Presentation transcript:

Rotation about single and multiple bonds butene rotation

Molecular Orbital Theory Molecular orbital theory postulates that the combination of atomic orbitals on different atoms forms molecular orbitals (MOs), so that electrons in them belong to the molecule as a whole. Valence Bond theory postulated that bonds were formed (sharing of electrons) by the overlap of pure atomic or hybrid orbitals of different atoms. Valence bond theory fails to account for the fact that O2 is paramagnetic .. .. O O .. .. .. ..

Bonding and Anti-bonding Orbitals Molecular Orbital Diagram 1s *  (Sigma star) 1s  (Sigma) Atomic Orbital Atomic Orbital Molecular Orbitals

Molecular Orbital Diagram for H2 (#e- in bonding orbitals) - (#e- in anti-bonding orbitals) 2 Bond Order = Bond Order for H2 = (2-0)/2 = 1

Molecular Orbital Diagram for H2 BO=1 Molecular Orbital Diagram for He2 BO (He2)=(2-2)/2=0

 anti-bonding Molecular Orbital Atomic P Orbitals  bonding Molecular Orbital  bonding Molecular Orbital  bonding Molecular Orbital Atomic P Orbitals

This information is in Table 9-1 of your book Go to Saunders 10-11 This information is in Table 9-1 of your book

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