Metal-metal bond Equilibria in aqueous solution. II. Zinc hydroxotetracarbonylferrates(−II)

✍ Scribed by F. Galembeck; G.H.M. Dias; V. Vanin; P. Krumholz

• Book ID: 104139180
• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 436 KB
• Volume: 20
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)94081-7

✦ Synopsis

The reaction of tetracarbonylferrate(-II) anion with Zn2+ was studied potentiometrically in the neutral and alkaline ranges of PH. On the basis of equilibrium measurements of hydrogen ion concentrations at 20" C and a total normality of 1.0 (NaClO& the existence of a number of species is indicated, including polynuclear mixed hydroxocomplexes. The constant Kz = 1.1 x 10' M-' is obtained for the equilibrium ZnFe(C0)4 + Fe(CO)42-it [ZnFe(CO)&? The existence of other species is indicated: ZnJFe(CO)& (OH),? ZnzFe(CO)4(OH)3, Zn4 [Fe(CO)4]3(OH)3-and ZnzFe(CO),(OH),. This strong tendency to the formation of mixed hydroxocomplexes is explained by the ability of the tetracarbonylferrate anion to keep zinc dissolved at pH's above neutrality, without occupying all of its co-ordinating sites.