DETERMINATION OF MOLECULAR WEIGHTS OF POLYNUCLEAR ZIRCONIUM AND THORIUM CHELATES BY NONEQUILIBRIUM ULTRACENTRIFUGATION

Journal Article · Sat Feb 01 04:00:00 EST 1964 · Journal of the American Chemical Society (U.S.)

DOI:https://doi.org/10.1021/ja01057a009· OSTI ID:4104438

Gustafson, R L; Martell, A E

The degrees of aggregation of 1: 1 Th( GAMMA V) --N- hydroxyethylethylenediamine triacetate (HEDTA), 1: 1: 1 Th(N)-HEDTA -- pyrocatechol 3,5-disulfonate (Tiron), 1: 1 Z r(N)REDTA, and 1: 1: 1 Zr(N) -- ethylenediamine tetraacetate (EDTA)--Tiron chelates were calculated from data obtained by nonequilibrium centrifugation in sodium chloride solutions at 25 deg . The 1: 1 Th( GAMMA V)-HEDTA chelate is shown to be most probably hexameric, whereas solutions containing equimolar amounts of Th(N), HEDTA, and Tiron to which have been added 42/3 and 6.0 moles of sodium hydroxide per mole of metal ion were found to be polydisperse. Solutions of Zr(N) and HEDTA at pH 6 were found to be composed of mixtures of monomers and dimers. A value of K/sub D/ = (dimer!/STAmonomer!/sup 2.14/ = 10/sup 2.14/ was obtained from the sedimentation data. The data obtained for the 1: 1: 1 Zr(IV)--EDTA--Tiron systems at pH 7 suggest that a mixture of monomers and dimers is present. (auth)

• Research Organization: Clark Univ., Worcester, Mass.; and Illinois Inst. of Tech., Chicago
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-012129
• OSTI ID: 4104438
• Journal Information: Journal of the American Chemical Society (U.S.), Journal Name: Journal of the American Chemical Society (U.S.) Vol. Vol: 86; ISSN JACSA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACIDITY
CATECHOL
CENTRIFUGATION
CHELATES
CHEMISTRY
EDTA
HEDTA
MOLECULES
MONOMERS
POLYMERS
PYROCATECHOL
QUANTITATIVE ANALYSIS
SODIUM CHLORIDES
SOLUTIONS
SULFONIC ACIDS
THORIUM COMPLEXES
TIRON
WEIGHT
ZIRCONIUM COMPLEXES