title: Crystal structure of di-μ-acetato-di-acetatobis-(μ-6,6'-dimeth-oxy-2,2'-{[(propane-1,3-diylbis(aza-nylyl-idene)]bis-(methanylyl-idene)}diphenolato)tetra-zinc.
abstract: The tetra-nuclear title complex, [Zn4(C19H20N2O4)2(CH3COO)4], is formed from two dinuclear motifs related by an inversion centre. The two crystallographically independent Zn(II) ions in the asymmetric unit are in different coordination environments. One is square-based pyramidal with one O atom of an acetate group occupying the axial position and two N and O atoms of one bmspd [H2bmspd = N,N'-bis-(3-meth-oxy-salicyl-idene)propyl-ene-1,3-di-amine] Schiff base ligand forming the basal plane. The other Zn(II) atom is six-coordinated by four O atoms of the bmspd ligand forming the equatoral plane and two O atoms of different acetate groups located in the axial positions. As a result, the two phenolic planes of the bicompartmental Schiff base ligand are distorted slightly. However, the planes of the two Schiff base ligands are parallel. In addition, the Zn-N and Zn-O bond lengths span the reasonable ranges 2.062 (2)-2.073 (2) and 1.9261 (15)-2.4356 (16) Å, respectively. The Zn⋯Zn distances separated by phenolic O atoms are 3.2466 (4) Å while the Zn⋯Zn distances bridged by acetate groups are 5.9835 (6) Å. The tetra-nuclear moieties are connected by van der Waals interactions, and form a chain along c axis.
authors: Department of Chemistry, Mudanjiang Normal University, Mudanjiang 157011, People's Republic of China.
authors: Xue
authors: X
authors: Cai
authors: Department of Chemistry, Mudanjiang Normal University, Mudanjiang 157011, People's Republic of China.
authors: Hui
authors: H
authors: Ning
keywords: Schiff base; acetate; crystal structure; zinc