SYNTHESIS, SPECTRAL AND STRUCTURAL CHARACTERIZATION OF THE FIRST BIS-2-PYRIDYLETHANOL COMPLEXES OF Mn(II), Fe(II), Co(II), Ni(II), Cu(II) AND Zn(II) SACCHARINATES: CRYSTAL STRUCTURES OF DIAQUABIS(2-PYRIDYLETHANOL)IRON(II) AND COPPER(II) SACCHARINATES

摘要

The first 2-pyridylethanol (pyet) complexes of manganese(II), iron(II), cobalt(II), nickel(II), copper(II) and zinc(II) saccharinates, were synthesized and characterized by elemental analyses, magnetic measurements, UV-Vis, and IR spectroscopic techniques. Crystal and molecular structures of the iron(II) and copper(II) complexes were determined by single crystal X-ray diffractometry. The experimental data showed that all the complexes are mononuclear with a general formula [M(H_2O)_2(pyet)_2](sac)_2, where sac is the saccharinate anion. All the metal ions are octahedrally coordinated by two aqua and two pyet ligands. The pyet ligand acts as a bidentate ligand through its amine nitrogen and hydroxyl oxygen atoms forming a six-membered chelate ring, while the sac ions remain outside the coordination sphere. All the complexes are isomorphous with a monoclinic space group 12_1 and Z= 2.