OBSERVATIONS ON THE RARE EARTHS. LXXVI. THE STABILITIES OF THE TRANS-1,2- DIAMINOCYCLOHEXANE-N,N'-TETRAACETIC ACID CHELATES OF THE TRI-POSITIVE IONS
Interaction between trans-1,2-diaminocyclohexane-N,N' tetra-acetic acid and tripositive rare-earth metal ions was investigated. The formation constants of the hydrogen chelates (LnHZ) and of the normal chelates (LnZ-) were evaluated at 20, 30, and 40 deg C and an ionic strength of 0.10 (KNO/sub 3/), the former by a titration technique and the latter by a mercury indicator-electrode technique. Enthalpy and entropy changes characterizing the formation of the normal chelates were calculated at 25 deg C. These and functions of the partial molal entropy of the normal chelates were compared with corresponding values for related chelating agents. The significance of a configurational entropy contribution is particularly apparent for the complexes of this somewhat sterically limited ligand. (auth)
- Research Organization:
- Univ. of Illinois, Urbana
- NSA Number:
- NSA-17-018055
- OSTI ID:
- 4736496
- Journal Information:
- Journal of Inorganic and Nuclear Chemistry (England) Merged with Inorg. Nucl. Chem. Lett. to form Polyhedron, Vol. Vol: 24; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
OBSERVATIONS ON THE RARE EARTHS. LXXV. THE STABILITIES OF DIETHYLENETRIAMINE-PENTAACETIC ACID CHELATES
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