Iron(II) complexes [Fe(DfgH)2(3-CONH2-Py)2] and [Fe(DfgH)2(4-COOC2H5-Py)2]: Synthesis and structures

The complexes [Fe(DfgH)(2)(3-CONH2-Py)(2)] (I) and [Fe(DfgH)(2)(4-COOC2H5-Py)(2)] (II), where DfgH(2) is alpha-benzyl dioxime, were obtained and examined by X-ray diffraction analysis. The equatorial planes of the coordination octahedra of the metal ions consist of two monodeprotonated alpha-benzyl dioxime residues united through intramolecular hydrogen bonds O-HaEuro broken vertical bar O into a pseudomacrocyclic system. The neutral molecules 3-CONH2-Py and 4-COOC2H5-Py are coordinated to the Fe2+ ion through the N atom of the heterocycle. Structure I is layered and structure II is molecular. Intermolecular interactions N-HaEuro broken vertical bar O are responsible for the formation of layers in crystal structure I.