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-CONH 2 -Py) 2 ] ( I ) and [Fe(DfgH) 2 (4-COOC 2 H 5 -Py) 2 ] ( II ), where DfgH 2 is α-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 α-benzyl dioxime residues united through intramolecular hydrogen bonds O-H…O into a pseudomacrocyclic system. The neutral molecules 3-CONH 2 -Py and 4-COOC 2 H 5 -Py are coordinated to the Fe 2+ ion through the N atom of the heterocycle. Structure I is layered and structure II is molecular. Intermolecular interactions N-H…O are responsible for the formation of layers in crystal structure I .