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Thermodynamic and spectroscopic studies of cadmium(II)-N-(phosphonomethyl)glycine (PMG) complexes

Ramstedt, M.; Norgren, C.; Sheals, J.; Bostrom, D.; Sjoberg, S. and Persson, Per LU (2004) In Inorganica Chimica Acta 357. p.1185-1192
Abstract
Speciation and equilibria in the H+-Cd2+-N-(phosphonomethyl)glycine (PMG, H3L) system have been studied in 0.1 M Na(Cl) medium at 25.0 degreesC. Formation constants for a series of mononuclear complexes, CdHL, CdL-, CdL24- and CdL(OH)(2)- were determined from potentiometric titrations. The structures of the predominating species CdL-, and CdL24- in solution were investigated using EXAFS and IR spectroscopic techniques. In the 1:1 complex bonds are formed between the Cd(II) ion and all three donor groups (amino, carboxylate, phosphonate) of the PMG molecule resulting in two 5-membered chelate rings. At the remaining three of the corners of the distorted Cd(II) octahedra oxygens were found which are replaced by donor groups of a second PMG... (More)
Speciation and equilibria in the H+-Cd2+-N-(phosphonomethyl)glycine (PMG, H3L) system have been studied in 0.1 M Na(Cl) medium at 25.0 degreesC. Formation constants for a series of mononuclear complexes, CdHL, CdL-, CdL24- and CdL(OH)(2)- were determined from potentiometric titrations. The structures of the predominating species CdL-, and CdL24- in solution were investigated using EXAFS and IR spectroscopic techniques. In the 1:1 complex bonds are formed between the Cd(II) ion and all three donor groups (amino, carboxylate, phosphonate) of the PMG molecule resulting in two 5-membered chelate rings. At the remaining three of the corners of the distorted Cd(II) octahedra oxygens were found which are replaced by donor groups of a second PMG molecule in the 1:2 complex. Furthermore, a solid phase consisting of Cd-9(PMG)(6)(H2O)(12) (.) 6H(2)O crystals was synthesized and the crystal structure was determined. The structure consists of six CdL- octahedra connected through a seventh Cd-O octahedron in the centre of the entity, with two additional Cd-O octahedra located at the apices of the unit formed. (C) 2003 Elsevier B.V. All rights reserved. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Inorganica Chimica Acta
volume
357
pages
1185 - 1192
publisher
Elsevier
external identifiers
  • scopus:1542286590
ISSN
0020-1693
DOI
10.1016/j.ica.2003.10.029
language
English
LU publication?
no
id
75c22f16-1823-4653-b56b-441eef15cccf (old id 4332531)
date added to LUP
2014-03-04 09:41:17
date last changed
2017-01-01 06:58:54
@article{75c22f16-1823-4653-b56b-441eef15cccf,
  abstract     = {Speciation and equilibria in the H+-Cd2+-N-(phosphonomethyl)glycine (PMG, H3L) system have been studied in 0.1 M Na(Cl) medium at 25.0 degreesC. Formation constants for a series of mononuclear complexes, CdHL, CdL-, CdL24- and CdL(OH)(2)- were determined from potentiometric titrations. The structures of the predominating species CdL-, and CdL24- in solution were investigated using EXAFS and IR spectroscopic techniques. In the 1:1 complex bonds are formed between the Cd(II) ion and all three donor groups (amino, carboxylate, phosphonate) of the PMG molecule resulting in two 5-membered chelate rings. At the remaining three of the corners of the distorted Cd(II) octahedra oxygens were found which are replaced by donor groups of a second PMG molecule in the 1:2 complex. Furthermore, a solid phase consisting of Cd-9(PMG)(6)(H2O)(12) (.) 6H(2)O crystals was synthesized and the crystal structure was determined. The structure consists of six CdL- octahedra connected through a seventh Cd-O octahedron in the centre of the entity, with two additional Cd-O octahedra located at the apices of the unit formed. (C) 2003 Elsevier B.V. All rights reserved.},
  author       = {Ramstedt, M. and Norgren, C. and Sheals, J. and Bostrom, D. and Sjoberg, S. and Persson, Per},
  issn         = {0020-1693},
  language     = {eng},
  pages        = {1185--1192},
  publisher    = {Elsevier},
  series       = {Inorganica Chimica Acta},
  title        = {Thermodynamic and spectroscopic studies of cadmium(II)-N-(phosphonomethyl)glycine (PMG) complexes},
  url          = {http://dx.doi.org/10.1016/j.ica.2003.10.029},
  volume       = {357},
  year         = {2004},
}