SYNTHESIS, SPECTROSCOPY, AND ELECTROCHEMISTRY OF RUTHENIUM(II) COMPLEXES OF 6-(N-PYRAZOLYL)-2,2'-BIPYRIDINES AND 6-(N-PYRAZOLYLMETHYL)-2,2'-BIPYRIDINES - NEW TRIDENTATE LIGANDS

Four new tridentate ligands, 5a, 5b, 6a, and 6b, have been synthesized from 2,2'-bipyridine and their homoleptic bis(ligand) ruthenium(II) complexes, 12a, 12b, 13a, and 13b, prepared. Complete assignments of the C-13 and H-1 NMR spectra of the ligands and complexes have been made, and the origins of the coordination induced shifts are discussed. The electronic absorption spectra and redox properties of the complexes have been measured and are discussed in relation to previously reported complexes.