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New monometallic bis-bipyridyl Ru(II) and Os(II) complexes bonded with high nitrogen content five membered aromatic dianionic ligands 5,5′-bis-tetrazolate (bt) and N,N-bis(tetrazol-5-yl)-amine (bta) have been prepared. NMR results presented are consistent with N1-N1 bidentate chelate bonding to the metal. Absorption spectra display lower energy M dπ→bpy π∗ metal to ligand charge transfer transitions...
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