Synthesis in Pyridylporphyrin Osmium(II) Dyads
Alison G. Hyslop, and Elise G. Megehee, St. John’s College of Liberal Arts and Sciences
Maria Orphanide, Urooj Javed, Xuilan Wang, Mahpara Khaliq, Rukya Ali, Virgnia Seng, Farah Charles Pierre, Shemille Collingswood, Joseph Capritto, Pantea Menhaji, Irma Tertulien, St. John’s University students
Porphyrin compounds are ubiquitous in nature and play key roles in light harvesting processes in photosynthesis through absorbing light energy and transferring the energy to a reaction center. Osmium metal complexes also absorb light and can be used in energy transfer reactions. Having recently published studies on the simplest 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.