Syntheses and crystal structures of Co 3 (C 2 O 4 )(SeO 3 ) 2 and Zn(C 2 O 4 ) · 2H 2 O

✍ Scribed by Giester, G.

• Book ID: 119965910
• Publisher: Oldenbourg Wissenschaftsverlag
• Year: 1997
• Tongue: English
• Weight: 958 KB
• Volume: 212
• Category: Article
• ISSN: 2194-4946
• DOI: 10.1524/zkri.1997.212.10.720

✦ Synopsis

Abstract

Co~3~(C~2~O~4~)(SeO~3~)~2~ and Zn(C~2~O~4~) · 2H~2~O were synthesized investigating the reaction products of Fe(C~2~O~4~) · 2H~2~O and SeO~2~ combined with transition metal elements at low-hydrothermal conditions. The crystal structures were determined by direct methods from single-crystal X-ray diffraction data. Co~3~(C~2~O~4~) (SeO~3~)~2~: space group __C__2/m, Z = 2, a = 9.163(2) Å, b = 6.513(2) Å, c = 7.806(2) Å, β = 117.14(2)°, V = 414.6(2) Å^3^, __R__1 = 0.023. Zn(C~2~O~4~) · 2H~2~O: space group __C__2/c, Z = 4, a = 11.812(3) Å, b = 5.402(1) Å, c = 9.919(2) Å, β = 127.72(1)°, V = 500.6(1) Å^3^; __R__1 = 0.029. Both compounds consist of MO~6~ octahedra (M = Co, Zn), linked via the oxalate groups to chainlike subunits. These are further combined via additional CoO~6~ octahedra and the trigonal pyramidal selenite group or via hydrogen bonds, respectively. Mean bond lengths are 2.119 Å and 2.099 Å for Co^[6]^–O, 1.701 Å for Se(IV)^[3]^–O and 2.094 Å for Zn^[6]^–O.