Published November 1991 | Version v1
Journal article

Solution stabilities of some mixed ligand complexes of UO22+ and Th4+ with complexones and salicylic acids

  • 1. Hari Singh Gour Vishwavidyalaya, Sagar (India). Department of Chemistry

Description

Formation constants (log Ksub(MAL)sup(MA)) of mixed ligands complexes (MAL), where M = UO22+ or Th4+, A = IMDA, NTA, HEDTA, EDTA, CDTA or DTPA, L = salicylic acid (SA) or 5-sulphosalicylic acid (SSA), have been determined by pH titrations using Irving-Rossotti approach at 25oC and at I =0.2 (mol dm-3, KNO3). The solution stabilities exhibit the sequence (i) Th4+>UO22+, (ii) IMDA>NTA>HEDTA>EDTA>CDTA>DTPA, and (iii) SA>SSA with respect to metal ions, primary ligands and secondary ligands, respectively. The formation constants log Ksub(ML)sup(M) and log Ksub(ML2)sup(ML) have also been determined. The Δlog K values have been found to be negative-increasing numerically with the negative charge on the deprotonated primary ligand (An-). (author). 17 refs., 1 tab

Additional details

Publishing Information

Journal Title
National Academy Science Letters
Journal Volume
14
Journal Issue
11
Journal Page Range
p. 409-411.
ISSN
0250-541X
CODEN
NASLDX