Multi-Iron Wells-Dawson Heteropolytungstates. Electrochemical Probing of Siderophoric Behavior in Sandwich-Type Complexes

Inorganic Chemistry

Volumn 43, Issue 10, 2004, Pages 3257-3263

  Keita, Bineta ^a   Mbomekalle, Israel Martyr ^a   Nadjo, Louis ^a   Anderson, Travis M ^b   Hill, Craig L ^b  

^a UNIVERSITÉ PARIS SUD   (France)

^b EMORY UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ELECTROLYTE; IRON DERIVATIVE; MONOMER; OXYGEN DERIVATIVE; SIDEROPHORE; SODIUM DERIVATIVE; TUNGSTEN DERIVATIVE;

ARTICLE; CONCENTRATION RESPONSE; COULOMETRY; CYCLIC POTENTIOMETRY; ELECTROCHEMICAL ANALYSIS; IONIC STRENGTH; OXIDATION REDUCTION REACTION; PH; REDUCTION; ROOM TEMPERATURE;

EID: 2442437840     PISSN: 00201669     EISSN: None     Source Type: Journal    
DOI: 10.1021/ic035495i     Document Type: Article

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39. This observation is consistent with the X-ray crystal structures of Fe4P4 and Fe4As4, that show there are two pairs of symmetry-equivalent Fe(III) centers. The "external" pair of Fe(III) centers have aqua ligands and can thus be considered as less electron rich than the "internal" Fe(III) centers, which contain a sixth oxo ligand. As a result, the "external" Fe(III) centers are likely to be reduced first. Furthermore, Fe3X4 and Fe2X4, which have been shown by X-ray crystallography to lose one or both of their external Fe(III) atoms, also show the loss of one or two of their most positive Fe(III)-based redox potentials, respectively. This is also consistent with the observation that the two most positive redox potentials are more sensitive than the two most negative potentials to changes in pH and ionic strength. For more information, see ref 25.
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47. (b) The behavior of W(VI) waves within POMs as a function of pH has been the subject of several previous investigations. See: (i) Reference 1. (ii) Reference 4. (iii) Reference 14. (iv) Reference 19. (v) References 30-31. (vi) Reference 34. (vii) Keita, B.; Nadjo, L. Mater. Chem. Phys. 1989, 22, 77-103.
48. (b) The behavior of W(VI) waves within POMs as a function of pH has been the subject of several previous investigations. See: (i) Reference 1. (ii) Reference 4. (iii) Reference 14. (iv) Reference 19. (v) References 30-31. (vi) Reference 34. (vii) Keita, B.; Nadjo, L. Mater. Chem. Phys. 1989, 22, 77-103.
49. (b) The behavior of W(VI) waves within POMs as a function of pH has been the subject of several previous investigations. See: (i) Reference 1. (ii) Reference 4. (iii) Reference 14. (iv) Reference 19. (v) References 30-31. (vi) Reference 34. (vii) Keita, B.; Nadjo, L. Mater. Chem. Phys. 1989, 22, 77-103.
50. (b) The behavior of W(VI) waves within POMs as a function of pH has been the subject of several previous investigations. See: (i) Reference 1. (ii) Reference 4. (iii) Reference 14. (iv) Reference 19. (v) References 30-31. (vi) Reference 34. (vii) Keita, B.; Nadjo, L. Mater. Chem. Phys. 1989, 22, 77-103.
51. (b) The behavior of W(VI) waves within POMs as a function of pH has been the subject of several previous investigations. See: (i) Reference 1. (ii) Reference 4. (iii) Reference 14. (iv) Reference 19. (v) References 30-31. (vi) Reference 34. (vii) Keita, B.; Nadjo, L. Mater. Chem. Phys. 1989, 22, 77-103.
52. (b) The behavior of W(VI) waves within POMs as a function of pH has been the subject of several previous investigations. See: (i) Reference 1. (ii) Reference 4. (iii) Reference 14. (iv) Reference 19. (v) References 30-31. (vi) Reference 34. (vii) Keita, B.; Nadjo, L. Mater. Chem. Phys. 1989, 22, 77-103.
53. (b) The behavior of W(VI) waves within POMs as a function of pH has been the subject of several previous investigations. See: (i) Reference 1. (ii) Reference 4. (iii) Reference 14. (iv) Reference 19. (v) References 30-31. (vi) Reference 34. (vii) Keita, B.; Nadjo, L. Mater. Chem. Phys. 1989, 22, 77-103.
54. (b) The behavior of W(VI) waves within POMs as a function of pH has been the subject of several previous investigations. See: (i) Reference 1. (ii) Reference 4. (iii) Reference 14. (iv) Reference 19. (v) References 30-31. (vi) Reference 34. (vii) Keita, B.; Nadjo, L. Mater. Chem. Phys. 1989, 22, 77-103.
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