Group Literature Talk Chandrani Chatterjee 6 th October 2008 Coordination Polymers Based on Aluminum(III) Porphyrins Gregory J. E. Davidson,* Laura A. Lane, Paul R. Raithby, John E. Warren, Carol V. Robinson and Jeremy K. M. Sanders*

Introduction Current Research Synthesis Characterization Crystal Structure Conclusion Outline

Introduction From the knowledge of a metalloporphyrin’s preferred coordination number, geometry, and ligand preference : multiporphyrin arrays with well-defined geometries One-dimensional (1-D) “shish kebab” coordination polymers containing metalloporphyrins and bridging ligands : conductive Polymers Metalloporphyrins containing iron(II)/iron(III), ruthenium(II), osmium(II), and cobalt(II) metal centers constitute 1-D coordination polymers Symmetrical bridging ligands commonly used : 4,4′-bypyridine (Figure 1) ; 1,4-diazabicyclo[2.2.2]octane Aluminum(III) benzoate complexes used as supramolecular blocks : a preference for binding nitrogenous ligands in the vacant axial site

Unsymmetrical Bridging Ligands Combining the carboxylate unit and a nitrogen donor : isonicotinic, nicotinic acid (Figure 2) Polymeric precursors : 1-D coordination polymers (Scheme 1)