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The type IV polymorph of KEu(PO(3))(4).

ABSTRACT: Single crystals of KEu(PO(3))(4), potassium europium(III) polyphosphate, were obtained by solid-state reactions. This monoclinic form is the second polymorph described for this composition and belongs to type IV of long-chain polyphosphates with general formula A(I)B(III)(PO(3))(4). It is isotypic with its KEr(PO(3))(4) and KDy(PO(3))(4) homologues. The crystal structure is built of infinite helical chains of corner-sharing PO(4) tetra-hedra with a repeating unit of eight tetra-hedra. These chains are further linked by isolated EuO(8) square anti-prisms, forming a three-dimensional framework. The K(+) ions are located in pseudo-hexa-gonal channels running along [01] and are surrounded by nine O atoms in a distorted environment.

SUBMITTER: Oudahmane A

PROVIDER: S-EPMC2972142 | biostudies-literature | 2009 Nov

REPOSITORIES: biostudies-literature

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The type IV polymorph of KEu(PO(3))(4).

Oudahmane Abdelghani A Daoud Mohamed M Tanouti Boumediene B Avignant Daniel D Zambon Daniel D

Acta crystallographica. Section E, Structure reports online 20091121 Pt 12

Single crystals of KEu(PO(3))(4), potassium europium(III) polyphosphate, were obtained by solid-state reactions. This monoclinic form is the second polymorph described for this composition and belongs to type IV of long-chain polyphosphates with general formula A(I)B(III)(PO(3))(4). It is isotypic with its KEr(PO(3))(4) and KDy(PO(3))(4) homologues. The crystal structure is built of infinite helical chains of corner-sharing PO(4) tetra-hedra with a repeating unit of eight tetra-hedra. These chai ...[more]

PMID: 21578546

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