Acta Cryst. (2007). E63, m2389-m2390  [ doi:10.1107/S1600536807040470 ]

The monoclinic polymorph of catena-poly[[diaquamanganese(II)]--oxalato-⁴O¹,O²:O^1',O^2']

J. Soleimannejad, H. Aghabozorg, S. Hooshmand, M. Ghadermazi and J. Attar Gharamaleki

Abstract: The title polymer, [Mn(C₂O₄)(H₂O)₂]_n, was synthesized by the reaction of manganese(II) nitrate tetrahydrate with a proton-transfer compound, (pipzH₂)(ox) (where oxH₂ is oxalic acid and pipz is piperazine), in aqueous solution. The structure features a six-coordinate Mn²⁺ ion located on a twofold rotation axis, with a distorted octahedral geometry [Mn-O = 2.1728 (8)-2.1914 (9) Å]. The bond angles show that the two coordinated water molecules are arranged trans. One-dimensional linear chains are formed through bis-bidentate oxalate ligands bridging the Mn^II ions. These structural units are held together by O-HO hydrogen bonds. A neutron diffraction study of [Mn(-ox)(D₂O)₂]_n, using powdered samples, has been published recently in the same space group [Sledzinska, Murasik & Fischer (1987). J. Phys. Solid State Phys. 20, 2247-2259]. However, it should be noted that an orthorhombic polymorph for the title polymer is also known [Huizing, van Hal, Kwestroo, Langereis & van Loosdregt (1977). Mater. Res. Bull. 12, 605-611; Lethbridge, Congreve, Esslemont, Slawin & Lightfoot (2003). J. Solid State Chem. 172, 212-218]. The present single-crystal X-ray study deals with the monoclinic polymorph. This phase is isostructural with the Co^II analogue.

Online 17 August 2007

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