Session: Coordination Chemistry: Synthesis and Characterization:

The di-(trichloro platinum(II)) – bis-(dipyrido(2,3-a:3',2'-j)phenazine)M where M = Ru(II) or Os(II) complexes were synthesized and characterized. Due to the limited solubility range of the [((Cl)₃Pt)₂M(dpop’)₂] complexes, NMR, electronic absorption and electrochemical results were obtained and are reported in DMF. ¹H resonances are consistent with symmetric coordination, and 2-D results were used for resonances assignments. Cyclic voltammetry results show four redox couples at negative potentials associated with dpop’ ^(0/-1) and dpop’ ^(-1/-2) ligand reductions. Electronic absorption spectra display intense M → dpop’ MLCT transitions in the visible spectrum and dpop’ π → dpop’π* IL transitions in the near UV. The neutral complexes are inert in only a few solvents including propylene carbonate and DMF. Both trimetallic complexes are soluble in DMSO, however, undergo pseudo first order - two step decomposition, initially yielding the [(Cl)₃Pt(dpop’)M(dpop’)]⁺ monometallic complexes and finally the respective [(dpop’)M(dpop’)]⁺² ions. Rate constants were determined from absorption data and product identification was deduced by NMR data.

Ronald R. Ruminski Ph.D.

Professor, University of Colorado Colorado Springs

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