Poly[tetra-μ-aqua-diaquatetrakis[μ-(E)-2-nitrocinnamato]tetrarubidium]

Abstract

In the structure of the title compound, [Rb4(C9H6NO4)4(H2O)6]n, the asymmetric unit comprises four rubidium cations, two of which have an RbO7 coordination polyhedron with a monocapped distorted octahedral stereochemistry and two of which have a distorted RbO6 octahedral coordination. The bonding about both the seven-coordinate cations is similar, comprising one monodentate water molecule together with three bridging water molecules and three carboxylate O-atom donors, two of which are bridging. The environments around the six-coordinate cations are also similar, comprising a monodentate nitro O-atom donor, a bridging water molecule and four bridging carboxylate O-atom donors [overall Rb—O range = 2.849 (2)–3.190 (2) Å]. The coordination leads to a two-dimensional polymeric structure extending parallel to (001), which is stabilized by interlayer water O—H...O hydrogen-bonding associations to water, carboxyl and nitro O-atom acceptors, together with weak inter-ring π–π interactions [minimum ring centroid–centroid separation = 3.5319 (19) Å].