The effect of several oxidizing metal salts on the square planar iridium(I) complexes trans-[IrI(CO)-(PPh3)2X] (where X− = Cl−, Br−, I−, N3−, NCO−, NCS−, and NO2−) has been investigated. With nitrate salts of Ce(IV), Fe(III), and Cu(II), several of the reactions gave products characterized by analysis and i.r. spectroscopy as [IrIII(CO)(PPh3)2X(NO3)2]. With CuCl2•2H2O and CuBr2 several of the same starting materials gave products, [IrIII(CO)(PPh3)2XY2] (where X− = NCO−, NCS−, NO2− and Y− = Cl−; and X− = NCO−, NCS−, Br−, NO2− and Y− = Br−). These have been similarly characterized. An iridium(III) complex, [IrIII(PPh3)2(NO3)2H] has also been characterized.
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Cash et al. (1971) studied this question.
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