Synthesis and Characterization of Bifunctional Metal Complexes

Download or read book Synthesis and Characterization of Bifunctional Metal Complexes written by and published by . This book was released on 2015 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this research project was to synthesize and characterize different bifunctional metal complexes possessing bipyridine (bipy) ligands substituted with two amino groups at the 6, 6' positions. The goal was to create catalysts with better performance by the addition of pendant basic amino groups. Three similar bipyridine ligands were synthesized: 6,6'-diamino-2,2'-bipyridine (A), N6, N6'-dimethyl-6,6'-diamino-2,2'- bipyridine (B), and N6, N6, N6', N6'-tetramethyl-6,6'-diamino-2,2'-bipyridine (C). Using these ligands, three sets of metal complexes were synthesized. The first set was [Ru(terpy)(bipy*)Cl]Cl complexes, where bipy* represents ligands A and B, which were characterized and tested in water oxidation reactions. The results indicated that both Ru complexes showed catalytic activities, but comparison with the parent 2,2'-bipyridine analog showed that the amino derivatives were not better as hoped. The second set of metal complexes were RuCp(bipy*)(CH3CN)PF6. All three ligands were successfully coordinated to the CpRu(CH3CN)+ fragment and the metal complexes were characterized using NMR and elemental analysis. The last set of metal complexes were [IrCp*(bipy*)Cl]Cl. Only ligands A and B could be coordinated and the two metal complexes were characterized. Although the three ligands have similar structure, basicity, and electronic properties, A and B were much easier to coordinate to metals than C, most likely because of less steric hindrance to metal binding at the pyridine nitrogens.