Crystal structure of poly[μ₂-aqua-aqua(μ₂-4-nitro-2,5,6-trioxo-1,2,5,6-tetrahydropyridin-3-olato)hemi-μ₄-oxalato-barium(II)]

Abstract

In a Ba coordination polymer incorporating 4-nitro-2,5,6-trioxo-1,2,5,6-tetra­hydro­pyridin-3-olate, oxalate and aqua ligands, the complex monomers are connected into polymeric two-dimensional layers parallel to the bc plane. Inter­molecular O—H⋯O hydrogen bonds link these layers into a three-dimensional supra­molecular framework.

Hexaaquanickel(II) bis[triaqua-μ3-oxalato-di-μ-oxalato-bariumchromate(III)] tetrahydrate

“…The Ba 2+ ion is linked to ten O atoms from three water molecules and four oxalate ligands (three chelating, one monodentately binding), with Ba-O bond lengths in the range 2.784 (3)-2.933 (3) Å (Table 1). These values are typical for ten-coordinate barium complexes with oxalate and water ligands (Alabada et al, 2015). One of the oxalate ligands (bearing O18) bridges three cations (two Ba and one Cr) while the two others are bis-chelating (one Ba and one Cr).…”