TETRAMERIC NICKEL(II) COMPLEX WITH DIETHYL 1-HYDROXYIMINOBENZYLPHOSPHONATE

The first metal complex of the diester of 1-hydroxyiminophosphonic aci d has been synthesized and characterized in the solid state and in sol ution. Diethyl 1-hydroxyiminobenzylphosphonate forms a tetrameric nick el(II) complex, [C33H48N3O14P3Ni2 . CHCl3](2), as monoclinic crystals, Each high-spin nickel(II) ion is octahedrally coordinated, and diethy l 1-hydroxyiminobenzylphosphonate acts as a chelating ligand. The comp lex also contains two hydroxyl groups, which act as bridges between th e metal ions. The spectroscopic data indicate that the same type of st ructure is present in the chloroform solution of the complex. Copyrigh t (C) 1996 Elsevier Science Ltd