| The reactions of [Ru(COD)Cl2]x with excesses of various aromatic amines have been studied. Up to six equivalents of pyridazine or pyrazole could be incorporated as monodentate ligands, resulting six coordinate, pseudo-octahedral complexes. Reaction with four equivalents of 1,8-naphthyridine led to the incorporation of two bidentate and two monodentate ligands. Correlations between RuII/III redox potentials and ligands' pi-donor/acceptor characteristics in some of these homoleptic complexes were studied through electrochemistry and electronic absorption spectroscopy.;The polybasic amine chemistry was extended to cobalt, and several complexes with different ligands were synthesized. Various forms of hydrogen bonding interactions were found in their solid state structures, and these interactions function as a driving force for molecular orientation and crystal packing. The potential for these complexes to be used for producing metal clusters was also explored.;A binuclear cobalt(III) complex, Co2(micro-przl)3(prz) 6(NO3)3, was isolated with three pyrazolyl groups as bridging ligands, and the product was structurally characterized. A heterobimetallic compound, Ru(prz)3(micro-przl)3Co(iPr-Br-prz) 3, also with three pyrazolyl groups as bridges was successfully synthesized from monometallic amine starting materials, and constitutes the first example of a structurally characterized ruthenium-cobalt bimetallic complex bridged by azoles. |
