ChemInform Abstract Magnetic susceptibility and EPR studies are reported for the two title complexes (I) and (II), whose structures are known. Whereas compound (I) reveals an exceptionally strong ferromagnetic interaction, compound (II) shows weakly antiferromagnetic interaction. The strategy of orthogonality between the magnetic orbitals is applied to discuss the difference between (I) and (II).
A series of bis(2,2'-bipyridyl)ruthenium compounds with pyridin-2-yl-l,2,4-triazoles has been prepared and characterised b y their l H and 13C n.m.r. spectra and their electronic and electrochemical properties. The 'H n.m.r. spectra have been used to ascertain the co-ordination mode of the ligands. The ligands bind in a bidentate fashion and they have n-acceptor properties that are weaker than 2,2'-bipyridyl (bipy). The excited-state properties of the complexes are similar to those of [Ru(bipy),]*+ but important variations in the energies of the absorption and the emission maxima are observed.' N m r . The '
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