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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.

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