Poly[di-μ-aqua-diaquabis(μ₇-oxalato-κ⁹O¹:O¹:O¹,O²:O²:O^2′:O^2′,O^1′:O^1′)calciumdicaesium]

Abstract

In the title compound, [CaCs2(C2O4)2(H2O)4]n, the Ca2+ ion, lying on a twofold rotation axis, is coordinated by four O atoms from two oxalate ligands and two bridging water mol­ecules in an octa­hedral geometry. The Cs+ ion is coordinated by seven O atoms from six oxalate ligands, one bridging water and one terminal water mol­ecule. The oxalate ligand displays a scarce high denticity. The structure contains parallel chain units runnig along [10-1], formed by two edge-sharing Cs polyhedra connected by CsO9 polyhedra connected by a face-sharing CaO6 octahedron. These chains are further linked by the oxalate ligands to build up a three-dimensional framework. O—H⋯O hydrogen bonds involving the water mol­ecules and the carboxyl­ate O atoms enhance the extended structure.

The new one-dimensional coordination polymercatena-poly[[diaquasodium(I)]-μ-oxalato-[diaquairon(III)]-μ-oxalato]

“…The solid-state coordination chemistry of oxalate compounds continues to receive much attention, with new structure types being reported for binary oxalate (Bacsa et al, 2005), ternary oxalate (Kherfi et al, 2011(Kherfi et al, , 2013Zhang et al, 2011) and hybrid metallic oxalate compounds (Farkasová et al, 2014;Chen et al, 2015). Moreover, the intense activity in the elaboration of new coordination polymers resulting from the combination of two or more metal ions with oxalate ligands, including openframework compounds, is due to their various properties, such as magnetic (Hursthouse et al, 2004), catalytic (Eddaoudi et al, 1999;Seo et al, 2000) and ion exchange (Crespi Caramella et al, 1999), and potential applications which stimulate further investigations towards elaborating strategies for discovering new families of metal-organic materials.…”

“…Furthermore, double oxalate compounds are well known for their use as precursors in the synthesis of highly active ternary oxides resulting from their thermal decomposition (Prasad, 2003). The oxalate dianion is one of the most studied ligands and is capable of bridging two or more metal centres and creating inorganic polymers based on the assembly of metal polyhedra with a wide variety of one-, two-or three-dimensional extended structures (Robin & Fromm, 2006;Bian et al, 2004;Chen et al, 2015;Kolitsch, 2004;Kherfi et al, 2011Kherfi et al, , 2013Zhang et al, 2011), in which it adopts a large range of coordination modes. Moreover, as a bridging ligand, it is used to transmit magnetic coupling interactions between metal ions along one-dimensional chains.…”

“…Among the oxalate-based compounds combining an alkali metal (A) and a trivalent element (M) with the general formula AM(C 2 O 4 ) 2 (H 2 O) n Á-xH 2 O (Bataille et al, , 2000Kolitsch, 2004;Bé lombé et al, 2006;Zhang et al, 2011), only a few crystal structures involving sodium have been reported in the literature, namely with M = In (Bulc et al, 1983), Y and Yb (Chapelet-Arab et al, 2006). As a continuation of work on mixed oxalate-based compounds with a tri-or bivalent element and A = Rb or Cs (Kherfi et al, 2011(Kherfi et al, , 2013, we now extend our activity to coordination polymers involving small alkali metals. A new coordination polymer has been prepared, i.e.…”