Rhodium complexes aqua halo

A wide range of rhodium(III) complexes contain halo, aqua, ammine diaminoalkane, or dicarboxylato ligands. Rhodium(III) complexes whose net ionic charge varies from -1-3 to -3 are known. With complexes that react slowly, it is possible to isolate most intermediate complexes in the interconversions of [Rh(H20)6] + and [RhCle] " (Scheme 10). The slow reaction rates of these complexes also allow geometrcal isomers to be isolated. Additionally, the cfr-[RhX2(LL)2]+ and [Rh(LL)3] + complexes containing bidentate ligands are chiral and may be resolved into their optical isomers. 

Rhodium(III) complexes typically contain anunine, halo, or aqua ligands, or the important bidentate ligands 1,2-diaminoethane (en), oxalato, or pentane-2,4-dionato (acac) and are invariably octahedral. Their wide variety is in part a reflection of the slow reactions, which take place at the low-spin d centers, which allow many intermediates, and geometrical or chiral isomers, to be isolated. It is fairly difficult to oxidize rhodium(III) complexes, but they may be reduced to rhodium(l) species in the presence of suitable ligands. However, there is little current work being carried out on the classical rhodium(III) complexes and even less on the higher oxidation states. 

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See also in sourсe #XX -- [ ]

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