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Hydrothermal routes to new sodium polytungstates

Hydrothermal routes to new sodium polytungstates
Hydrothermal routes to new sodium polytungstates
The new acidic sodium polytungstates, Na5[H7W12O42]·20H2O ( 1) and Na2[H10W12O42]·20H2O ( 2), have been synthesised under hydrothermal conditions where variations of pH and temperature allow control of the protonation of the [W12O42]12- cluster in the products. The polytungstate cluster, [HnW12O42](12-n)-, in each compound consists of the well known polyhedral unit based on 12 edge- and corner-sharing WO6 octahedra, though the decoration of this unit with varying levels of protons results in significant changes in the W–O distances. The polytungstate clusters exist in arrays separated by sodium ions and water molecules forming well separated, (polytungstate centre to centre distance of 10.87 Å), rhombohedrally stacked units in 1 and strongly hydrogen bonded and more tightly packed units, (centre to centre distance of 9.34 Å), due to the high H : Na ratio in 2

0300-9246
4468-4472
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Redrup, Kate Victoria
36b0e2f5-fae3-4c42-bfb0-9fb5d794fdf6
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Redrup, Kate Victoria
36b0e2f5-fae3-4c42-bfb0-9fb5d794fdf6

Weller, Mark T. and Redrup, Kate Victoria (2009) Hydrothermal routes to new sodium polytungstates. Dalton Transactions, 4468-4472. (doi:10.1039/b818103a).

Record type: Article

Abstract

The new acidic sodium polytungstates, Na5[H7W12O42]·20H2O ( 1) and Na2[H10W12O42]·20H2O ( 2), have been synthesised under hydrothermal conditions where variations of pH and temperature allow control of the protonation of the [W12O42]12- cluster in the products. The polytungstate cluster, [HnW12O42](12-n)-, in each compound consists of the well known polyhedral unit based on 12 edge- and corner-sharing WO6 octahedra, though the decoration of this unit with varying levels of protons results in significant changes in the W–O distances. The polytungstate clusters exist in arrays separated by sodium ions and water molecules forming well separated, (polytungstate centre to centre distance of 10.87 Å), rhombohedrally stacked units in 1 and strongly hydrogen bonded and more tightly packed units, (centre to centre distance of 9.34 Å), due to the high H : Na ratio in 2

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Published date: 2009

Identifiers

Local EPrints ID: 158747
URI: http://eprints.soton.ac.uk/id/eprint/158747
ISSN: 0300-9246
PURE UUID: 57f711d3-8073-474c-aaaa-3314e5701a42

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Date deposited: 23 Jun 2010 13:24
Last modified: 19 Jul 2019 23:17

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Contributors

Author: Mark T. Weller
Author: Kate Victoria Redrup

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