COORDINATION COMPOUNDS. II. TRENDS IN THE STABILITY OF SOME RARE EARTH CHELATES

Journal Article · Tue May 01 04:00:00 EDT 1962 · Inorganic Chemistry (U.S.)

DOI:https://doi.org/10.1021/ic50002a018· OSTI ID:4827485

Cefola, M; Tompa, A S; Celiano, A V; Gentile, P S

A potentiometric study was made of the chelates formed by the cerium group of rare earth chlorides (lanthanum, cerium, praseodymium, and neodymium) with several types of organic compounds, including the amino, hydroxy, and mercapto analogs of acetic, propionic, benzoic, and succinic acids. The order of decreasing stability for the ligands was aspartic, malic, glycine, thiomalic, anthranilic, glycolic, BETA -alanine, salicylic, BETA - hydroxy propionic, BETA -mercapto propionic, and thioglycolic. The stability of chelates with analogs of acetic, propionic, benzoic, and succinic acids decreased for any given acid as the donor group changes from --NH/sub 2/ to --OH to --SH. Considering acids which contain the same donor group (--NH/sub 2/ or --OH or --SH) decreasing stability was observed in the analogs of succinic, acetic, benzoic, and propionic acids, in that order, the only exception being thioglycolic acid which, of all the ligands, formed the weakest chelate. (auth)

• Research Organization: Fordham Univ., New York
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-022103
• OSTI ID: 4827485
• 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

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