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Die Abhängigkeit der Geschwindigkeitskonstanten der Bildung des Titelkomplexes von der Ionenstärke in saurer Lösung wurde bei 25°C untersucht.

The kinetics of replacement of the ligand in the pentacyano(ligand)ferrate(ll) ions have been examined for the leaving ligands NN-dirnethyl(p-nitroso)aniline, nitrosobenzene, sulphite. and water, respectively, and for the entering ligands nitrosobenzene, 3-cyanopyridine, NN-dimethyl(p-nitroso)aniline, thiocyanate, nitrite, cyanide, and sulphite. Limiting reaction rates, a t sufficiently large concentrations, of entering ligand have been observed with all the leaving ligands, except water, where the replacements obey the second-order rate law -d[Fe(CN),-When the entering ligand Y bears no electrical charge, the ky values are very similar and in the range 200-300 I mol-l s-l at 25 "C and 1~ ionic strength. For singly negatively charged anions ky N-40-60, and for the doubly charged SO,2-ion ky = 3.3 I mol-1 s-l. The variations in kp are interpreted as being due to variations in diffusion rates since the reactions of the intermediate [Fe(CN),I3with the ligands are diffusion controlled.