Poly[[μ2-aqua-tetraaquadi-μ3-malonato-nickel(II)strontium(II)] dihydrate

Abstract

The unit-cell parameters for the title mixed-metal coordination polymer, {[NiSr(C3H2O4)2(H2O)5]·2H2O}n, which is isostructural with its Co-containing analogue, were reported previously [Gil de Muro et al. (1999 ▶). Eur. J. Inorg. Chem. pp. 935–943]; the full crystal structure including a description of the hydrogen bonding is reported here. The Sr2+ ion is bonded to five O atoms from three different malonate dianions and four water mol­ecules, displaying a distorted tricapped trigonal–prismatic coordination geometry. Two malonate dianions, two water mol­ecules and one Ni2+ ion build up a dianionic [Ni(C3H2O4)2(H2O)2]2− unit incorporating a slightly distorted NiO6 octa­hedron, which coordinates to three nearby Sr2+ ions. This arrangement creates a metal-organic framework having a 20-membered ring with four Ni and six Sr atoms lying in the bc plane. The coordinated and uncoordinated water mol­ecules are responsible for the formation of two D5 hydrogen-bonded water chains within the 20-membered ring and they are linked into an R4 water cluster via two bifurcated O—H⋯(O,O) links.