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OBSERVATIONS ON THE RARE EARTHS. LXXIII. THE HEAT AND ENTROPY OF FORMATION OF THE 1:1 CHELATES OF N-HYDROXYETHYLETHYL-ENEDIAMINETRIACETIC ACID WITH THE TRIPOSITIVE CATIONS

Journal Article · · J. Inorg. & Nuclear Chem.
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Enthalpy changes in the formation of N- hydroxyethylethylenediaminetriacetic acid (H/sub 3/HEDTA) chelates of the tripositive rare-earth metal ions are evaluated by the temperature coefficient method for aqueous solutions of ionic strength 0.l(KNO/sub 3/). Corresponding entropy changes are calculated from the enthalpy changes and stability constants at 25 deg . Values of enthalpy and entropy changes for the formation of Ca(HEDTA)/sup -/, Cu(HEDTA)/sup -/, and Cu(tren)/sup 2+/ are obtained also. An interpretation of data for the rareeanth metal chelates is offered and extended to other published data. Consideration of both translational and configurational entropy changes is shown to be neecessary, and the importance of the latter in these complexes is emphasized. (auth)

Research Organization:
Univ. of Illinois, Urbana
NSA Number:
NSA-16-010012
OSTI ID:
4811059
Journal Information:
J. Inorg. & Nuclear Chem., Journal Name: J. Inorg. & Nuclear Chem. Vol. Vol: 20
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

BINDING ENERGY
CALCIUM COMPLEXES
CATIONS
CHELATES
CHEMISTRY
COMPOUND NUCLEI
CONFIGURATION
COPPER COMPLEXES
DIFFERENTIAL EQUATIONS
DISPERSIONS
EDTA
ENERGY LEVELS
ENTHALPY
ENTROPY
EXCITATION
HEATING
IONS
JOURNAL
LATTICES
MATHEMATICS
MATRICES
METALS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEAR THEORY
NUCLEI
ORGANIC ACIDS
ORGANIC NITROGEN COMPOUNDS
POTASSIUM NITRATES
POTASSIUM NITRIDES
PREPARATION
QUANTUM MECHANICS
RARE EARTHS
RESONANCE
SOLUTIONS
SPECTRA
STABILITY
SURFACES
TABLES
TEMPERATURE
TEMPERATURE COEFFICIENT
THERMODYNAMICS
TRANSLATIONS
WATER