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Characterisation of gallium(III)-acetate complexes in aqueous solution: A potentiometric, EXAFS, IR and molecular orbital modelling study

Clausen, M.; Ohman, L. O.; Kubicki, J. D. and Persson, Per LU (2002) In Journal of the Chemical Society. Dalton Transactions p.2559-2564
Abstract
The aqueous gallium(III)-acetate system was studied in 0.6 M Na(Cl) at 25 degreesC using a multi-technique approach, including potentiometry, IR spectroscopy, EXAFS spectroscopy and molecular orbital calculations. The potentiometric data were satisfactorily explained by a model which includes one mononuclear and one binuclear complex. The corresponding equilibrium constants defined according to the reactions Ga3+ + HAc reversible arrow GaAc2+ + H+ 2Ga(3+) + HAc + 2H(2)O reversible arrow Ga-2(OH)(2)Ac3+ + 3H(+) are log beta(-1,1,1) = -2.08 +/- 0.09 and log beta(-3,2,1) = -5.65 +/- 0.06, respectively. The latter complex has a stoichiometry identical to that previously identified in the aluminium(III)-acetate system. Also in agreement with... (More)
The aqueous gallium(III)-acetate system was studied in 0.6 M Na(Cl) at 25 degreesC using a multi-technique approach, including potentiometry, IR spectroscopy, EXAFS spectroscopy and molecular orbital calculations. The potentiometric data were satisfactorily explained by a model which includes one mononuclear and one binuclear complex. The corresponding equilibrium constants defined according to the reactions Ga3+ + HAc reversible arrow GaAc2+ + H+ 2Ga(3+) + HAc + 2H(2)O reversible arrow Ga-2(OH)(2)Ac3+ + 3H(+) are log beta(-1,1,1) = -2.08 +/- 0.09 and log beta(-3,2,1) = -5.65 +/- 0.06, respectively. The latter complex has a stoichiometry identical to that previously identified in the aluminium(III)-acetate system. Also in agreement with this system, the IR and EXAFS data strongly indicates that this complex consists of two edge-sharing Ga octahedra bridged with an acetate ion, and should be formulated [Ga-2 (mu-OH)(2) (mu-O2CCH3)](3+). This interpretation is further supported by the molcular orbital calculations. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the Chemical Society. Dalton Transactions
pages
2559 - 2564
publisher
Royal Society of Chemistry
external identifiers
  • scopus:0036017280
ISSN
1472-7773
DOI
10.1039/B111408E
language
English
LU publication?
no
id
43140303-0004-42f2-94a3-a699de4f9c61 (old id 4332575)
date added to LUP
2014-03-04 09:42:51
date last changed
2017-09-03 04:32:19
@article{43140303-0004-42f2-94a3-a699de4f9c61,
  abstract     = {The aqueous gallium(III)-acetate system was studied in 0.6 M Na(Cl) at 25 degreesC using a multi-technique approach, including potentiometry, IR spectroscopy, EXAFS spectroscopy and molecular orbital calculations. The potentiometric data were satisfactorily explained by a model which includes one mononuclear and one binuclear complex. The corresponding equilibrium constants defined according to the reactions Ga3+ + HAc reversible arrow GaAc2+ + H+ 2Ga(3+) + HAc + 2H(2)O reversible arrow Ga-2(OH)(2)Ac3+ + 3H(+) are log beta(-1,1,1) = -2.08 +/- 0.09 and log beta(-3,2,1) = -5.65 +/- 0.06, respectively. The latter complex has a stoichiometry identical to that previously identified in the aluminium(III)-acetate system. Also in agreement with this system, the IR and EXAFS data strongly indicates that this complex consists of two edge-sharing Ga octahedra bridged with an acetate ion, and should be formulated [Ga-2 (mu-OH)(2) (mu-O2CCH3)](3+). This interpretation is further supported by the molcular orbital calculations.},
  author       = {Clausen, M. and Ohman, L. O. and Kubicki, J. D. and Persson, Per},
  issn         = {1472-7773},
  language     = {eng},
  pages        = {2559--2564},
  publisher    = {Royal Society of Chemistry},
  series       = {Journal of the Chemical Society. Dalton Transactions},
  title        = {Characterisation of gallium(III)-acetate complexes in aqueous solution: A potentiometric, EXAFS, IR and molecular orbital modelling study},
  url          = {http://dx.doi.org/10.1039/B111408E},
  year         = {2002},
}