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We report the use of 3,3-bis(2-imidazolyl) propionic acid (bip-OH, 1) as a new chelating bis(imidazole) ligand. The synthesis and full characterization of complexes Re(bip-O)(CO) 3 2 and [Ru(bpy) 2 (bip-OH)] 2+ 3 is reported. Both complexes show interesting spectroscopic properties, namely IR for compound 2 and 1 H NMR for 3, respectively. The free carboxylic acid functionality...