Synthesis and physicochemical investigations of Ir(3) hexafluorocomplexes

Ir (3) hexafluorocomplexes constituting Me3IrF6, where Me=K, Rb, Cs, were obtained by reducing solid Ir (4) hexafluorocomplexes with h drazine hydrate at room temperature. According to chemical analysis and potentiometric titration data, all the salts were extracted in sufficiently pure state. However, infrared spectroscopy showed a hydrazine admixture (up to 1%) to be contained in the more soluble cesium salt. The behaviour of the synthetized complexes in aqueous solutions was studied. An analysis of the electron absorption spectra of the Cs3IrF6 solution (C=4.3x10-3 gxmole/l) indicated that Ir (3) hexafluorocomplexes possessed considerable stability in hydrolysis reactions. The 19F NMR spectrum for Cs3IrF6 was represented by one widened component, and the spin-spin interaction constant so far could not be determined. The chemical shift equaled 887 p.p.m. in relation to F