[Mn(H2O)4(C4N2H4)][C6H4(COO)2] - An One-Dimensional Coordination Polymer with Chain-like Polycations

What is it about?

Orthorhombic single crystals of [Mn(H2O)4(C4N2H4)][C6H4(COO)2] have been prepared in aqueous solution at room temperature. Space group Imm2 (no. 44), a = 1039.00(6) pm, b =954.46(13) pm, c = 737.86(5) pm, V = 0.73172(12) nm3, Z = 2. Mn2+ is coordinated in a octahedral manner by four water molecules and two nitrogen atoms stemming from the pyrazine molecules (Mn-O 215.02(11) pm; Mn-N 228.7(4), 230.7(4) pm). Mn2+ and pyrazine molecules form chain-like polycations with [Mn(H2O)4(C4N2H4)]n2n+ composition. The positive charge of the polycationic chains is compensated for by phthalate anions, which are accomodated between the chains. The phthalate anions are linked by hydrogen bonds to the polycationic chains. Thermogravimetric analysis in air revealed that the loss of water of crystallisation and pyrazine occurs in two steps between 130 and 245 °C. The resulting sample was stable up to 360 °C. Further decomposition yielded Mn2O3.

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