Abstract
New water-soluble rhodium(III) complexes with a tacn (1,4,7-triazacyclononane) and a bpy (2,2 ′-bipyridine) supporting ligands were synthesized. The reaction of [Rh III(tacn)Cl 3] ( 1) with equimolar amount of bpy and two equivalents of AgNO 3 in H 2O at reflux for 10 h gave a water-soluble chloro complex [Rh III(tacn)(bpy)Cl](NO 3) 2 { 2(NO 3) 2}. Complex 2(NO 3) 2 was treated with equimolar amount of AgNO 3 in H 2O at reflux for 10 h to give a water-soluble nitrato complex [Rh III(tacn)(bpy)(NO 3)](NO 3) 2 { 3(NO 3) 2}. Water-solubility of 3 with NO 3 − ligand (46.5 mg/mL) is high compared with that of 2 with Cl − ligand (14.5 mg/mL) under the same conditions (at pH 7.0 at 25 °C). The structures of 2 and 3 were unequivocally determined by X-ray analysis. Their structures in H 2O were also examined by 1H NMR, IR, and electrospray ionization mass spectrometry (ESI-MS).
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