COMPLEX SYSTEMS OF THE RARE EARTH METALS WITH GLYCOLATE, LACTATE AND $alpha$-HYDROXYISOBUTYRATE LIGANDS

Technical Report · Tue Feb 12 04:00:00 EST 1963

OSTI ID:4658670

Powell, J E; Karraker, R H; Kolat, R S; Farrell, J L

The stability constants for the reaction of the trivalent rare earth metal ions with glycolate, lactate, and alpha hydroxyisobutyrate ligands have been determined. A potentiometric measurement of the hydrogen ion concentrations of solutions containing varying amounts of the ligands was used to determine these constants. The ionic strength of the solutions was adjusted to 0.10 with sodium perchlorate and the constants were measured at 20 deg . The order of stabilities was found to be glycolate < lactate < alpha -hydroxyisobutyrate. The solid, hydrated triglycolates, trilactates, and tri- alpha - hydroxyisobutyrates of the rare earths and yttrium were prepared, analyzed, and thermally decomposed on a recording balance to determine the normal degree of hydration of the solid chelates. From aqueous solution the glycolates of the light rare earths, lanthanum through europium, were found to separate in anhydrous form only; whereas, the glycolates of the heavy rare earths, gadolinium through lutetium, were obtained as dihydrates. From a warm solution gadolinium glycolate was also obtained in the anhydrous form. All of the lactates prepared (neodymium through lutetium) were obtained as trihydrates, but the rare earth alpha -hydroxyisobutyrates contained from 3 to 7 moles of water (from cerium through neodymium the hydration number was 3, from samarium through gadolinium the number was 5, and from terbium through lutetium and in the case of yttrium the number was 6). Lanthanum alpha -hydroxyisobutyrate alone exhibited an as prepared'' hydration number of seven. Thermal decomposition of the hydrated rare earth lactates and alpha -hydroxyisobutyrates yielded both dihydrated and anhydrous compounds in most instances, although a few monohydrated compounds were observed in the alpha hydroxyisobutyrate series. The solubilities of the individual rare earth lactates and alpha ,hydroxyisobutyrates in water at 20 and 80 deg were determined for comparison with the rare earth glycolate solubilities determined earlier. (auth)

• Research Organization: Ames Lab., Ames, Iowa
• DOE Contract Number: W-7405-ENG-82
• NSA Number: NSA-17-033870
• OSTI ID: 4658670
• Report Number(s): IS-621; CONF-20-6
• Country of Publication: United States
• Language: English

Related Subjects

ACIDITY
BUTYL RADICALS
BUTYRIC ACID
CATIONS
CERIUM COMPOUNDS
CHELATES
CHEMISTRY
COMPOUNDS
ELECTRIC POTENTIAL
ELECTROCHEMISTRY
ELECTRODES
EUROPIUM COMPOUNDS
GADOLINIUM COMPOUNDS
GLYCOLIC ACID
HYDROXIDES
LACTIC ACID
LANTHANUM COMPOUNDS
LUTETIUM COMPOUNDS
MEASURED VALUES
NEODYMIUM COMPOUNDS
ORGANIC ACIDS
PERCHLORIC ACID
PREPARATION
PYROLYSIS
QUANTITATIVE ANALYSIS
QUANTITY RATIO
RARE EARTHS
RECORDING SYSTEMS
SALTS
SAMARIUM COMPOUNDS
SODIUM COMPOUNDS
SOLIDS
SOLUBILITY
SOLUTIONS
STABILITY
TERBIUM COMPOUNDS
WATER
WEIGHT
YTTRIUM COMPOUNDS