Crystal structure of di-mu-chlorido-bis(chlorido-{N-1,N-1-diethyl-N-4-[(pyridin-2-yl-kappa N)methylidene]-benzene-1,4-diamine-kappa N-4}mercury(II))

Abstract

The title dinuclear mercury(II) complex, [Hg2Cl4(C16H19N3)(2)], synthesized from the pyridine-derived Schiff base (E)-N-1,N-1-diethyl-N-4-[(pyridin-2-yl)methylidene]benzene-1,4-diamine (DPMBD), has inversion symmetry. The five-coordinated Hg-II atoms have distorted square-pyramidal stereochemistry comprising two N-atom donors from bidentate chelate BPMBD ligands and three Cl-atom donors, two bridging and one monodentate. The dihedral angle between the benzene and the pyridine rings in the BPMBD ligand is 7.55 (4)degrees. In the crystal, the dinuclear molecules are linked by weak C-H center dot center dot center dot Cl hydrogen bonds, forming zigzag ribbons lying parallel to [001]. Also present in the structure are pi-pi interactions between benzene and pyridine rings [minimum ring-centroid separation = 3.698 (8) angstrom].