The phenanthrene molecule (29) belongs to the group C2v with the C, axis in the plane of the molecule.
(a) Classify the irreducible representations spanned by the carbon 2pz orbitals and find their symmetry adapted linear combinations.
(b) Use your results from part (a) to calculate the Huckel secular determinant. (c) What states of phenanthrene may be reached by electric dipole transitions from its (totally symmetrical) ground state?

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29 Phenanthrene