Porphyrins and osmium metal complexes absorb light and can be used in energy transfer reactions. Having published studies on an osmium-porphyrin dyad, the first examples of an osmium attached through coordination directly to the porphyrin periphery, we are expanding this study to include modified porphyrins and modified osmium complexes. By joining together these two moieties, the ability of the complexes to absorb light and transfer the energy can be modified. We have found that the osmium portion absorbs the light and transfers the energy to the porphyrin fragment. A new series of osmium-porphyrin compounds are being synthesized and studied to explore their light harvesting capabilities. These alterations change the light absorbing and emitting properties of the complexes and will affect the energy transfer reactions that may occur.