ULTRACENTRIFUGATION OF 1: 1 Th(IV)-DIETHYLENETRIAMINEPENTAACETIC ACID AND 1: 1.5 Th(IV)-PYROCATECHOL-3,5-DISULFONATE CHELATES

Journal Article · Tue Nov 01 04:00:00 EST 1960 · Journal of the American Chemical Society (U.S.)

DOI:https://doi.org/10.1021/ja01506a013· OSTI ID:4118634

Gustafson, R L; Martell, A E

The application of ultracentrifuge measurements to the determination of molecular weights of charged metal chelates was investigated using the 1 : 1 Th(IV)-diethylenetriaminepentaacetate (DTPA) and 1: 1.5 Th(IV)-pyrocatechol-3,5- disulfonate (Tiron) systems. The Archibald nonequilibrium method of determining molecular weights as described bv Klainer and Kegeles was applied to the methods of dealing with charged polymers as outlined by Johnson, et al. The calculated values of the molecular weight of the monomeric Th(IV)-DTPA chelate (which was employed as a model system) were approximately 10 per cent lower than the actual value, presumably because of the fact that a nonideal supponting electrolyte, 1 M NaNO/sub 3/, was employed. The substitution of KNO/sub 3/ for NaNO/sub 3/ resulted in molecular weight values which were only 3 per cent below the theoretical value. Investigation of the 1: 1.5 Th(IV)-Tiron system of 1 M NaCl showed that a binuclear chelate is the predominant species. The effects of varying type and concentration of the supporting electrolyte were studied and discussed in terms of the primary and secondary salt effects. (auth)

• Research Organization: Clark Univ., Worcester, Mass.
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-007253
• OSTI ID: 4118634
• Journal Information: Journal of the American Chemical Society (U.S.), Journal Name: Journal of the American Chemical Society (U.S.) Vol. Vol: 82; ISSN JACSA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACETIC ACID
AMINES
CATECHOL
CENTRIFUGATION
CHELATES
CHEMISTRY
DTPA
ELECTROLYTES
ETHYLENE
MEASURED VALUES
MOLECULAR WEIGHT
MOLECULES
ORGANIC COMPOUNDS
POLYMERS
POTASSIUM NITRATES
PYROCATECHOL
QUANTITATIVE ANALYSIS
SODIUM CHLORIDES
SODIUM NITRATES
SULFONIC ACIDS
SULFUR COMPOUNDS
THORIUM COMPLEXES
THORIUM COMPOUNDS
TIRON
WEIGHT