Synthesis, Crystal Structure, and IR and Mössbauer Spectroscopy of the Isotypic SeriesM3Fe2(SeO3)6·2H2O (M=Mg, Co, Ni)

✍ Scribed by G. Giester; A. Beran; G.J. Redhammer

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 770 KB
• Volume: 131
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7339

✦ Synopsis

The representatives of the new isotypic series M 3 Fe 2 (SeO 3 ) 6 • 2H 2 O (M ‫؍‬ Mg, Co, Ni) were prepared at 500 K from aqueous solutions, kept in Teflon-coated autoclaves. Their crystal structures were determined by direct methods from single-crystal X-ray diffraction data in the space group P1 with Z‫.1؍‬ Mg 3 Fe 2 (SeO 3 ) 6 • 2H 2 O: a‫,)2(494.6؍‬ b‫,)3(959.7؍‬ c‫)4(018.8؍‬ A s , ‫,)2(88.58؍‬ ‫,)2(21.97؍‬ ‫,°)2(90.67؍‬ V‫9.334؍‬ A s 3 . Co 3 Fe 2 (SeO 3 ) 6 • 2H 2 O : a‫,)2(025.6؍‬ b‫,)3(599.7؍‬ c‫)4(477.8؍‬ A s , ‫,)2(15.58؍‬ ‫,)1(77.87؍‬ ‫,°)1(48.57؍‬ V‫8.434؍‬ A s 3 . Ni 3 Fe 2 (SeO 3 ) 6 • 2H 2 O : a‫,)2(474.6؍‬ b‫,)3(349.7؍‬ c‫)4(637.8؍‬ A s , ‫؍‬ 85.37( 1), ‫,)1(15.87؍‬ ‫,°)1(19.57؍‬ V‫7.624؍‬ A s 3 . The three different M sites are commonly occupied by M 2؉ and Fe 3؉ atoms in varying ratios. MO 6 octahedra are linked to each other by edges to build four-membered groups. Via common corners with further MO 6 octahedra and trigonal pyramidal SeO 3 groups, complex sheets parallel to (001) are formed which are interconnected by hydrogen bonds only. IR and Mo¨ssbauer spectra are discussed.