Abstract

The chemistry of nickel, palladium and platinum in quenched (Na, K)CN eutectic melts has been investigated by diffuse-reflectance and infrared measurements. Nickel, when added as Ni(II), displays the characteristic spectra of Ni(II), and Ni(0) cyanide species. Only the latter species is formed when Ni(I) is added to the melt. A Ni(I) complex, Ni 2(CN) 4− 6 is formed when Ni(II) and Ni powder is added to the melt. Palladium, when added as Pd(II), displays the characteristic spectra of Pd(II) and Pd(I) cyanide compounds. A Pd(0) cyanide complex formed when sodium cyanamide (reducing agent) is added to the latter melt. Three species, characterised as Pt(II), Pt(I) and Pt(0) cyanide complexes are formed when Pt(II) compounds are added to the melt. The concentration of the Pt(0) species is increased by adding sodium cyanamide to the melt, while the concentration of the Pt(I) species is increased upon he addition of sodium dicyanamide (oxidising agent). The preparation and identification of a palladium cyanohydride complex is also described.

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