CRYSTAL STRUCTURES OF TWO 1:1 COMPLEXES OF MANGANESE(II) WITH 1,10-PHENANTHROLINE,CONTAINING COORDINATED AND UNCOORDINATED SULFATE ANIONS

Abstract

The crystal structures of fac-triaqua-(1,10-phenanthroline-N,N′)-sulfato-manganese(II) (1) and tetraaqua-(1,10-phenanthroline-N,N′)-manganese(II) sulfate dihydrate (2) are described. The coordination polyhedron around the Mn(II) ion displays a distorted octahedral shape and contains the N,N′-chelating phen ligand. In the first complex the coordination sphere is completed by three water molecules and a monodentate O-sulfato ligand (C _3v), whereas in the second one, an uncoordinated sulfate ion (T_d ) and four coordinated water molecules have been found. In both structures, the molecular units are extensively 2-D hydrogen bonded, with the 1,10-phenanthroline ligands arranged roughly perpendicular to the sheets; the bidimensional sheets are piled up giving rise to polar layers made by the hydrogen bonded species, the aqua-ions, sulfate anions, and water molecules, alternated with apolar layers formed by the 1,10-phenanthroline ligands.