Crystal and molecular structure of the potassium salt of polymeric manganese(III) malonate, K[Mn(C3H2O4)2(CH3OH)]

Abstract

The crystal structure of the compound hitherto regarded as K[Mn(C₃H₂O₄)₂(OH₂)₂] has been found to be K[Mn(C₃H₂O₄)₂(CH₃OH)] as established by X-ray diffraction. The crystals are triclinic, space group P, with a= 8.55(2), b= 8.56(1), c= 8.95(1)Å, α= 113.60(9), β= 94.78(10), γ= 99.97(10)°, and Z= 2. The structure has been solved using Patterson and Fourier methods, least-squares refinement giving a final R= 0.051 and R¹′= 0.042 for 1 231 reflections with l > 1.96σ(l). The two different manganese atoms occupy special positions and have different octahedral environments. In one case, two malonate ligands and two methanol molecules are involved in co-ordination, while in the second only malonate groups are involved.