Crystal structure and thermochemical properties of a first scandium borophosphate, Sc(H2O)2[BP2O8]•H2O

被引：30

作者：

Ewald, B ^{[1
]}

Prots, Y ^{[1
]}

Kudla, C ^{[1
]}

Grüner, D ^{[1
]}

Cardoso-Gil, R ^{[1
]}

Kniep, R ^{[1
]}

机构：

[1] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

来源：

CHEMISTRY OF MATERIALS | 2006年 / 18卷 / 03期

关键词：

D O I：

10.1021/cm051577o

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Crystalline samples of scandium borophosphate, Sc(H2O)[BP2O8](H2O)-H-circle, were synthesized hydrothermally from acidic suspensions of scandium sesquioxide and boric and phosphoric acid at 4143 K. The chiral crystal structure (space group P6(5)22 (No. 179), a = 957.52(3) pm, c = 1581.45(6) pm, Z = 6) was solved from sin-le-crystal data and contains helical chain anions (1)(infinity)[BP2O83-] of alternating borate and phosphate tetrahedra interconnected by ScO4(H2O)(2) coordination octahedra. On thermal treatment. a reversible release of the hydrate water from the structural channels is observed, and rehydation appears as soon as the compound is exposed to air moisture for at least 1 day. X-ray powder diffractions show that the structure is retained during the de-/rehydration process. Both the crystal structure of the dehydrated phase, Sc(H2O)(2)[BP2O8] (a = 953.5(1) pm, c = 1576.8(2) pm), and that of the rehydrated phase, which is identical to the hydrothermal product, were refined from X-ray powder data with Rietveld methods. When the dehydrated phase is exposed to an ammonia atmosphere, NH3 absorption is observed.

引用

页码：673 / 679

页数：7

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