OBSERVATIONS ON THE RARE EARTHS. LXXIV. THE ENTHALPHY AND ENTROPY OF FORMATION OF THE 1:1 AND 1:2 CHELATES OF NITRILOTRIACETIC ACID WITH TRIPOSITIVE CATIONS

Journal Article · Wed Jan 31 23:00:00 EST 1962 · Inorganic Chemistry (U.S.)

DOI:https://doi.org/10.1021/ic50001a010· OSTI ID:4800857

Moeller, T; Ferrus, R

Enthalpy changes in the formation of 1: 1 and 1:2 nitrilotriacetic acid (H/sub 3/NTA) chelates of the tripositive rare earth metal ions were evaluated by the temperature coefficient method for aqueous solutions of ionic strength 0.l0 (KNO/sub 3/). Corresponding entropy changes were calculated from the enthalpy changes and stability constants at 25 deg . Values of enthalpy and entropy changes for the formation of Ca(NTA)- and Cu(NTA)- were obtained also. The importance of the configurational entropy in accounting for trends in the stabilities of the rare earth metal chelates again is apparent. (auth)

• Research Organization: Univ. of Illinois, Urbana
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-011601
• OSTI ID: 4800857
• Journal Information: Inorganic Chemistry (U.S.), Journal Name: Inorganic Chemistry (U.S.) Vol. Vol: 1; ISSN INOCA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACETIC ACID
BINDING ENERGY
CALCIUM COMPLEXES
CATIONS
CHELATES
CHEMISTRY
COPPER COMPLEXES
CYANIDES
ENTHALPY
ENTROPY
NITRILES
POTASSIUM NITRATES
RARE EARTHS
SOLUTIONS
STABILITY
TEMPERATURE
THERMODYNAMICS
WATER