Periodicity in the formation constant values of lanthanide (III) aminopolycarboxylate resorcinol/orcinol/phloroglucinol mixed ligand complexes
Creators
- 1. Dr. H.S. Gour Vishwavidyalaya, Sagar (India). Dept. of Chemistry
Description
Formation constants (log Ksub(MAL)sup(MA) of mixed ligand complexes [Ln(III).A.L], where Ln(III) = La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Tb3+ or Dy3+; A = NTA, HEDTA or EDTA and L = resorcinol (res), orcinol (orc) or phloroglucinol (phl), have been determined pH-metrically using the Irving-Rossotti approach at 25oC and at an ionic strength, I=0.2(mole dm-3, NaClO4). The log Ksub(MAL)sup(MA) values lie in the sequence: (i) NTA>HEDTA>EDTA and (ii) orc>res>phl with respect to primary (A) and secondary (L) ligands, respectively. Periodicity has been observed in the formation constant values, which lie in the sequence La3+Gd<3+f3-f4 ≅ f10-f11. Hydration numbers (HN) of Ln(III) ions have been calculated; tetrad effect is present in HN. (author). 37 refs., 2 tabs., 2 figs
Additional details
Publishing Information
- Journal Title
- Proceedings - Indian Academy of Sciences. Chemical Sciences
- Journal Volume
- 105
- Journal Issue
- 3
- Journal Page Range
- p. 155-160.
- ISSN
- 0253-4134
- CODEN
- PIAADM
INIS
- Country of Publication
- India
- Country of Input or Organization
- India
- INIS RN
- 24058338
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- CERIUM COMPLEXES; CHEMICAL REACTION KINETICS; DYSPROSIUM COMPLEXES; EDTA; EUROPIUM COMPLEXES; GADOLINIUM COMPLEXES; HEDTA; HYDRATION; LANTHANUM COMPLEXES; NEODYMIUM COMPLEXES; NTA; POTENTIOMETRY; PRASEODYMIUM COMPLEXES; RESORCINOL; SAMARIUM COMPLEXES; TERBIUM COMPLEXES
- Descriptors DEC
- AMINO ACIDS; AROMATICS; CARBOXYLIC ACIDS; CHELATING AGENTS; COMPLEXES; DEVELOPERS; HYDROXY ACIDS; HYDROXY COMPOUNDS; KINETICS; ORGANIC ACIDS; ORGANIC COMPOUNDS; PHENOLS; POLYPHENOLS; RARE EARTH COMPLEXES; REACTION KINETICS; SOLVATION; TITRATION