Crystal Structure and Intercalation Properties of γ-Zr(AsO4)(H2AsO4) × 2 H2O

✍ Scribed by Julio Rodríguez; Marta Suárez; M. Luz Rodríguez; Ricardo Llavona; M. José Arce; Miguel A. Salvadó; Pilar Pertierra; Santiago García-Granda

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 196 KB
• Volume: 1999
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199901)1999:1<61::aid-ejic61>3.0.co;2-w

✦ Synopsis

The crystalline structure of γ-Zr(AsO 4 )(H 2 AsO 4 ) × 2 H 2 O (γ-amines (benzylamine, cyclohexylamine, piperidine, and pyridine). Among the linear amines, only with methyl-, ZrAs) has been refined by the Rietveld method. It has a monoclinic P2 1 layered structure built up from AsO 4 ethyl-, and hexylamine is the maximum incorporation attained. With the cyclic amines, except in the case of tetrahedra and ZrO 6 octahedra stacked along the 001 direction. The cell parameters are: a = 5.5752(6) A ˚, b = pyridine, pure new phases are obtained, with the highest degree of intercalation being one mol of amine per mol of 6.8290(7) A ˚, c = 12.110(1) A ˚, and β = 103.03(1)°. The layered nature of γ-ZrAs is confirmed by the intercalation of nγ-ZrAs. alkylamines (CH 3 [CH 2 ] n NH 2 ; n = 0-5) as well as of cyclic cavities in α-ZrAs are about the same size as those in α- [a] Departamento de Quı ´mica Orga ´nica e Inorga ´nica, Facultad de Quı ´mica, Universidad de Oviedo, thesis of γ-ZrAs via its half-exchanged ammonium phase, E-33071 Oviedo, Spain and some preliminary data towards its characterization. In