Investigations of a Phenanthroline-Based Azo Dye Ligand and of Re(I) and Ru(II) Complexes Based on This Ligand
Master of Science (MS)
Semester of Degree Completion
Mark E. McGuire
A 1,10-phenanthroline based azo dye ligand, phen-azo-phenol, produced by diazotizing 5-amino-1,10-phenanthroline (5-NH2-phen) and then coupling to phenol, and several transition metal complexes containing this ligand, have been synthesized and characterized. The phen-azo-phenol ligands attach to Re(I) and Ru(II) through the phenanthroline linkage to form stable polypyridyl complexes. These complexes show greatly enhanced absorption properties in the visible region when compared to the well-known analogous bipyridine and phenanthroline containing complexes. The visible light absorption of the free ligand and the complexes containing this ligand are greatly affected by the position of the deprotonation equilibrium of the -OH group on the phenol moiety in the phen-azo-phenol ligand. The pKa of one of the Ru(II) complexes, [RuII(bpy)2(phen-azo-phenol)](PF6)2, has been determined to be 7.7 in aqueous solution.
Zhang, Yan, "Investigations of a Phenanthroline-Based Azo Dye Ligand and of Re(I) and Ru(II) Complexes Based on This Ligand" (1999). Masters Theses. 1650.