Crystal structures of two one-dimensional coordination polymers constructed from Mn2+ ions, chelating hexafluoro-acetylacetonate anions, and flexible bipyridyl bridging ligands

The syntheses and crystal structures of two one-dimensional coordination polymers, [Mn(C5HO2F6)2(C16H20N2)]n (1) and [Mn(C5HO2F6)2(C20H20N2)]n (2), are described, where C5HO2F6– is the hexafluoro-acetylacetonate anion, C16H20N2 is 1,6-bis(4-pyridyl)-hexane and C20H20N2 is 1,4-bis[2-(3-pyridyl)ethyl]-benzene. In both phases, the metal ion lies on a crystallographic twofold axis and is coordinated by two chelating C5HO2F6– anions and two bridging bipyridyl ligands to generate a cis-MnN2O4 octahedron. The bridging ligands, which are completed by crystallographic inversion symmetry in both compounds, connect the metal nodes into zigzag [201 ̅] chains in 1 and contorted [001] chains in 2. Intra-chain C–HO interactions occur in 1 but not in 2, which may be correlated with the relative orientations of the ligands. Crystal data: 1, C26H22F12MnN2O4, Mr = 709.40, monoclinic, C2/c (No. 15), a = 9.3475 (2) Å, b = 16.6547 (3) Å, c = 18.3649 (4) Å,  = 91.1135 (8), V = 2858.50 (10) Å3, Z = 4, R(F) = 0.030, wR(F2) = 0.075. 2, C30H22F12MnN2O4, Mr = 757.44, monoclinic, C2/c (No. 15), a = 19.9198 (2) Å, b = 10.6459 (2) Å, c = 16.8185 (3) Å,  = 119.8344 (8), V = 3093.91 (9) Å3, Z = 4, R(F) = 0.032, wR(F2) = 0.078.