Question

Ex cr. Draw the three pi-type molecular orbitals on the molecule ozone (O_3). Assume an sp^2 sigma framework for the molecule. Arrange the orbitals in the correct order from lowest to highest energy and assign them as bonding, antibonding or nonbonding.

Answer 1

Ozone Let's look at the molecular orbital diagram of ozone. We'll use the hybrid orbital approximation. Each oxygen atom combines its 2s, 2pz and 2py orbitals to make three 2sp hybrid orbitals. O uses one 2sp orbital to combine with one 2p orbital of O2, making a sigma bonding and sigma antibonding orbital . O3 uses one 2sp2 orbital to combine with a second 2sp, orbital of O2, making another sigma bonding and s2ma antibonding orbital . Two 2sp orbitals on O1, one 2sp orbital on O2, and two 2sp orbitals on O3 are non-bonding. non-bonding O2 2sp
     
The p orbitals in the picture above indicate electron density in those orbitals. T1, bonding all the way across the 3 atoms . π2. non-bonding, zero pi electron density on the second atom TC3, antibonding, the mathematical sign of the wavefunction changes with every atom, repulsive interaction between atoms The full molecular orbital diagram with the electrons is below. O3 Molecular Orbitals Oxygen Atomic Orbitals 713 Ol 2 Ps Ps 02 2sp2 n.b