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For example, a transition between a pure singlet state and a pure triplet state is forbidden. However, if spin-orbit coupling is present, the singlet could have the same total angular momentum as the triplet and the two states could interact. The interaction is indicated by equation (7): 41 ELECTRONIC ABSORPTION SPECTROSCOPY If/ =a 11f/ + b 31f/ ... (7) where '", and 3", correspond to pure singlet and triplet states, respectively, '" represents the actual ground state, and a and bare coefficients indicating the relative contributions of the pure states.

In the excited state there is only one electron in the it orbital, the hydrogen bond is weaker and, as a result, the -solvent does not lower the energy of this state nearly as much as that of the ground state. In these hydrogen bonding systems an adduct is formed, and this specific solutesolvent interaction is the main cause of the blue shift. If there is more than one lone pair of electrons on the donor, the shift can be accounted, for by the inductive effect of hydrogen bonding to one electron pair on the energy of the other pair.

This is the presently held view of the assignment of this spectrum, and it can be seen that the arguments are not rigorous. We shall subsequently show how polarization studies aid in making assignments more rigorous. Next, it is informative to discuss the uv spectrum of acetaldehyde, which is quite similar to that of formaldehyde. The nb --+ 1t* transition has very low intensity. However, acetaldehyde has C. symmetry; this point group has only two irreducible representations, A and B, with the x and y vectors transforming as A and the z vector as B.

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