Solvothermal synthesis and characterization of 2D to 3D metal-citrate coordination polymer linked by K+ ions: {K[Mn(C6H5O7)(H2O)]}n

The coordination polymer {K[Mn(C6H5O7)(H2O)]}n (1) (C6H5O73− = citrate trianion) was synthesized by solvothermal reaction and characterized analytically, spectroscopically (IR, EPR, XPS), thermally and magnetically. In compound 1, each citrate served as the unique pentadentate ligand coordinating to three Mn(II) ions. The carboxylate-bridged di-manganese cores were interlocked by α- and β-carboxylates of the citrate chains into 2D layers, which are then woven in [1 0 0] direction into a novel 3D network by the K+ linkers.