Complexing tendencies of UO 22+ and Th4+ in their mixed ligand complexes with aminopolycarboxylates and resorcinol or its derivatives |
| |
Authors: | R K Singh and M C Saxena |
| |
Institution: | (1) Department of Chemistry, Dr. Harisingh Gour Vishwavidyalaya, 470003 Sagar, India |
| |
Abstract: | Formation contants (log K
MAL
MA
) of mixed ligand complexes MAL, where M = UO
2
2+
or Th4+, A = IMDA, NTA, HEDTA, EDTA, CDTA or DTPA, and L = resorcinol (res), 2-methyl resorcinol (2-Me-res), 5-methyl resorcinol
(5-Me-res) or 4-chloro resorcinol (4-Cl-res), have been determined pH-metrically by the Irving-Rossotti approach at 25°C and
at an ionic strength,I = 0.2(moldm−3KNO3). The observed stability sequences are IMDA > NTA > HEDTA > EDTA > CDTA > DTPA, and 4-Cl-res > 5-Me-res > 2-Me-res > res
with respect to primary and secondary ligands, respectively. Th4+ forms more stable mixed complexes than UO
2
2+
. The A ΔlogK values are negative due mainly to the charge repulsion involved in the complexation MA + L⇋MAL. |
| |
Keywords: | UO 2 2+ /Th4+ mixed ligand complexes aminopolycarboxylate resorcinol formation constants |
本文献已被 SpringerLink 等数据库收录! |
|