SYNTHESIS AND CRYSTAL STRUCTURE OF A SUCCINATOMANGANESE(II) COMPLEX WITH PHENANTHROLINE

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Abstract
The title complex [Mn(C4H4O4)(phen)(H2O)3] · 2H2O has been prepared and its crystal structure determined by X-ray diffraction methods. The Mn(II) atom has octahedron coordination formed by four oxygen and two nitrogen atoms. The coordination mode of the succinate dianion in the complex is remarkably different from those reported previously. One carboxyl group of the succinate dianion coordinates to the Mn(II) atom as a monodentate and the other carboxyl group is free. The crystal structure consists of the complex and crystalline water molecules. All the oxygen atoms in the structure take part in an H-bonding network and assemble to form a hydrophilic layer, while phenanthroline ligands between neighboring hydrophilic layers to form a hydrophobic layer. Tight stacking interactions of phenanthroline rings are observed in the hydrophobic layer as evidenced by the short distance (3.312 Å) between neighbouring parallel ring planes.