ISSN:
1434-1948
Keywords:
Polyoxometalates
;
Heteropolyanions
;
Dawson-type structures
;
Transition metal cations
;
Electrochemistry
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The complexes formed by [(1)-2,3-P2Mo2W15O61]10- with vanadium(IV), manganese(II), cobalt(II), nickel(II), copper(II), and zinc(II) were synthesized. They were characterized by elemental analysis, IR, UV/Vis and 31P NMR spectroscopy. Their electrochemical studies are complemented by those of the previously synthesized iron(III)- and Mo(VI)-substituted complexes. Among the main conclusions from the electrochemistry of all these compounds, it can be pointed out that only the iron(III) and the copper(II) ions within the complexes are reducible in the same potential domain as the molybdenum(VI) moieties. In the case of the iron(III) complex, it has been possible to obtain a reversible overall three-electron process on the first wave of the oxometalate by varying the pH of the solution. In contrast, copper can be deposited from the corresponding complex. Substitution of [(1)-2,3-P2Mo2W15O61]10- with vanadium(IV), manganese(II), iron(III), cobalt(II), nickel(II), copper(II), zinc(II) and molybdenum(VI) gives a series of complexes in which the trimetallic moiety constituting one of the ‘‘caps’’ of the polyoxometalate contains cations different from the remaining tungsten skeleton. The electrochemical properties of these complexes are modulated by this particular constitution.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
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