A general synthetic procedure for heteropolyniobates

May Nyman; François Bonhomme; Todd M. Alam; Mark A. Rodriguez; Brian R. Cherry; James L. Krumhansl; Tina M. Nenoff; Amy M. Sattler

doi:10.1126/science.1073979

A general synthetic procedure for heteropolyniobates

May Nyman, François Bonhomme, Todd M. Alam, Mark A. Rodriguez, Brian R. Cherry, James L. Krumhansl, Tina M. Nenoff, Amy M. Sattler

Arizona State University

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Abstract

The heteropolyanions of W, Mo, and V, which have found numerous applications, are formed simply by acidification of solutions of their oxoanions. Under similar conditions, these oxoanion precursors are not available for Nb, and Nb-oxo chemistry is dominated by formation of the Lindquist ion [Nb₆O₁₉]^8- only. However, heteropolyniobate formation is favored in hydrothermal reactions of aqueous, alkaline precursor mixtures. Here we give two examples of heteropolyniobates formed by this general reaction type: K₁₂[Ti₂O₂] [SiNb₁₂O₄₀]·16H₂O [1], which contains chains of silicododecaniobate Keggin ions, and Na₁₄[H₂Si₄Nb ₁₆O₅₆]·45.5H₂O [2], a new heteropolyanion structure type.

Original language	English (US)
Pages (from-to)	996-998
Number of pages	3
Journal	Science
Volume	297
Issue number	5583
DOIs	https://doi.org/10.1126/science.1073979
State	Published - Aug 9 2002

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title = "A general synthetic procedure for heteropolyniobates",

abstract = "The heteropolyanions of W, Mo, and V, which have found numerous applications, are formed simply by acidification of solutions of their oxoanions. Under similar conditions, these oxoanion precursors are not available for Nb, and Nb-oxo chemistry is dominated by formation of the Lindquist ion [Nb6O19]8- only. However, heteropolyniobate formation is favored in hydrothermal reactions of aqueous, alkaline precursor mixtures. Here we give two examples of heteropolyniobates formed by this general reaction type: K12[Ti2O2] [SiNb12O40]·16H2O [1], which contains chains of silicododecaniobate Keggin ions, and Na14[H2Si4Nb 16O56]·45.5H2O [2], a new heteropolyanion structure type.",

author = "May Nyman and Fran{\c c}ois Bonhomme and Alam, {Todd M.} and Rodriguez, {Mark A.} and Cherry, {Brian R.} and Krumhansl, {James L.} and Nenoff, {Tina M.} and Sattler, {Amy M.}",

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doi = "10.1126/science.1073979",

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T1 - A general synthetic procedure for heteropolyniobates

AU - Nyman, May

AU - Bonhomme, François

AU - Alam, Todd M.

AU - Rodriguez, Mark A.

AU - Cherry, Brian R.

AU - Krumhansl, James L.

AU - Nenoff, Tina M.

AU - Sattler, Amy M.

PY - 2002/8/9

Y1 - 2002/8/9

N2 - The heteropolyanions of W, Mo, and V, which have found numerous applications, are formed simply by acidification of solutions of their oxoanions. Under similar conditions, these oxoanion precursors are not available for Nb, and Nb-oxo chemistry is dominated by formation of the Lindquist ion [Nb6O19]8- only. However, heteropolyniobate formation is favored in hydrothermal reactions of aqueous, alkaline precursor mixtures. Here we give two examples of heteropolyniobates formed by this general reaction type: K12[Ti2O2] [SiNb12O40]·16H2O [1], which contains chains of silicododecaniobate Keggin ions, and Na14[H2Si4Nb 16O56]·45.5H2O [2], a new heteropolyanion structure type.

AB - The heteropolyanions of W, Mo, and V, which have found numerous applications, are formed simply by acidification of solutions of their oxoanions. Under similar conditions, these oxoanion precursors are not available for Nb, and Nb-oxo chemistry is dominated by formation of the Lindquist ion [Nb6O19]8- only. However, heteropolyniobate formation is favored in hydrothermal reactions of aqueous, alkaline precursor mixtures. Here we give two examples of heteropolyniobates formed by this general reaction type: K12[Ti2O2] [SiNb12O40]·16H2O [1], which contains chains of silicododecaniobate Keggin ions, and Na14[H2Si4Nb 16O56]·45.5H2O [2], a new heteropolyanion structure type.

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A general synthetic procedure for heteropolyniobates

Abstract

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