Synthesis and crystal structures of water-soluble rhodium(III) complexes with 1,4,7-triazacyclononane and 2,2-bipyridine supporting ligands |
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| Authors: | Hideki Hayashi Shunichi Fukuzumi |
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| Affiliation: | Department of Material and Life Science, Graduate School of Engineering, Osaka University, PRESTO & CREST, Japan Science and Technology Agency (JST), Yamada-oka 2-1, Suita 565-0871, Japan |
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| 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 [RhIII(tacn)Cl3] (1) with equimolar amount of bpy and two equivalents of AgNO3 in H2O at reflux for 10 h gave a water-soluble chloro complex [RhIII(tacn)(bpy)Cl](NO3)2 {2(NO3)2}. Complex 2(NO3)2 was treated with equimolar amount of AgNO3 in H2O at reflux for 10 h to give a water-soluble nitrato complex [RhIII(tacn)(bpy)(NO3)](NO3)2 {3(NO3)2}. Water-solubility of 3 with NO3 − 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 H2O were also examined by 1H NMR, IR, and electrospray ionization mass spectrometry (ESI-MS). |
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| Keywords: | Water-soluble rhodium complexes Crystal structures |
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