The electronic excited states of biomolecules are selectively reviewed from approximately mid 1975 through mid 1976. The inclusion of all papers has not been attempted and exclusion does not necessarily reflect the pertinence of a paper. We urge authors to send us their reprints for future series of this Yearly Review.
Porphyrins and chlorophyllsThe CND0/2 calculations have been performed for chlorophyll a (chl a), chlorophyll b (chl b) and their Be analogs [65]. Results indicate that the 3d atomic orbitals of the metal contribute significantly to the CJ and n bonding energies. The molecule is stabilized by 167 kJ . mol-' (40 kcal mol-I) when MgZf is replaced by Be2+. Shipman et al. [ 12 11 have discussed