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Structures of Two New Polymorphic Forms of Hexavalent Tungsten Oxide Phosphates

✍ Scribed by Masafumi Hanawa; Hideo Imoto

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
282 KB
Volume
144
Category
Article
ISSN
0022-4596

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✦ Synopsis

Two new modi5cations of tungsten oxide phosphates, WOP2O7(o) and W2O3(PO4)2(o), were prepared, and their structures were determined by single crystal X-ray techniques. WOP2O7(o) crystallizes in the orthorhombic system, space group Pnma (No. 62) with a ‫؍‬ 16.662(2), b ‫؍‬ 5.147(2), c ‫؍‬ 6.612(4) A s . The structure was re5ned to an R factor of 0.028 (Rw ‫؍‬ 0.022). The compound has a layered structure, where the layers are not bridged. Diphosphate group has a terminal oxygen atom bonded only with a phosphorus atom. W2O3(PO4)2(o) also crystallizes in the orthorhombic system, space group Pnma (No. 62) with a ‫؍‬ 15.683(1), b ‫؍‬ 6.249(1), c ‫؍‬ 7.934(1) A s . The re5nement yielded R ‫؍‬ 0.019 (Rw ‫؍‬ 0.016). The structure is composed of dioctahedral W2O11 groups and PO4 groups to form a threedimensional network.

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