The cobalt(III) complexes containing ammoniatriacetato group (ata) as a quadridentate ligand are newly prepared:
i) α-K[Co ata(OH)(OH2)]·2H2O
ii) β-K[Co ata(OH)(OH2)]·3H2O
iii) K2[ataCo(OH)2Co ata]·6H2O
iv) K2[Co ata(CO3)]·H2O
v) K2[Co ata(C2O4)]·H2O
In order to determine the structural formulae of these complexes, their visible, ultraviolet and infrared spectra were measured, as well as their thermal decomposition and their potency to coagulate ferric oxide sol.
Reaction of hydrogen peroxide with titanium(IV) has been investigated over the range of pH 0 to 13. Below pH 2 this reaction gives orange-colored ion-species, [Ti(OH)2(H2O)(H2O2)]2+ or (TiO2·-aq)2+. In the range of pH 3 to 6 formation of a yellow species is observed and its chemical formula is presumed to be [Ti(OH)3(H2O2)]+. Existence of a species different from the above is indicated by the pale yellow color observed in the region of pH 7 to 9. This species is very unstable unless a large excess of hydrogen peroxide is present, and its chemical formula is presumed to be [Ti(OH)3(OOH)]0. At higher pH values (10<pH), the reaction mixture is colorless, and presumably contains [Ti(OH)2(O2)2]2−. All the tentative formulae of these species are based on the composition of isolated salts, the absorption spectra of the solutions etc. A solution containing [Ti(OH)2(H2O)(H2O2)]2+ remains unchanged but a solution containing [Ti(OH)3(H2O2)]+ gives a yellow precipitate TiO(OH)(OOH), and one containing [Ti(OH)3(OOH)]0 or [Ti(OH)2(O2)2]2− gives a pale yellow compound (Remark: Graphics omitted.) at room temperature or more quickly when heated on a water-bath. The precipitation reaction of (Remark: Graphics omitted.) is taken advantage of in a new volumetric analysis suited for determination of titanium in quantities of the order of 10 mg.
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