Anhydrous barium strontium oxalate

Abstract

In the title compound, (Ba0.741Sr0.259)C2O4 or C2Ba0.741O4Sr0.259, the asymmetric unit consists of one disordered barium/strontium ion lying on a crystallographic twofold rotation axis and half of a centrosymmetric oxalate ion (one C and two O atoms). The crystal structure can be described as double parallel zigzag chains runnning along the c axis and linked together by additional monodentate oxalate‐metal bonding. The distance between two chains is b/2. Each metal ion has six O‐atom neighbours and they are linked together via the different coordination modes of the oxalate groups, resulting in the formation of a three‐dimensional network.

Poly[[μ-aqua-tetraaquabis(μ-2-hydroxy-4-oxocyclobut-1-ene-1,3-diolato)strontium] hemihydrate]

“…For the isostructural mixed-metal Ba/Sr analogue of the title compound and background references, see: Trifa et al (2011).…”

“…As part of our ongoing sturctural studies of alkaline-earth squarate coordination networks (Trifa et al, 2011), we now descibe the synthesis and structure of the title compound, (I).…”

Mixed Ca/Sr salt forms of salicylic acid: tuning structure and aqueous solubility

“…Whilst molecular structures with mixedmetal sites are known both for mixed Group 2 metal species (e.g. Trifa et al, 2007) and for mixed Group 1 with Group 2 metal species (e.g. Kennedy et al, 1998), there are surprisingly few examples of systematic structural studies of this phenomenon.…”

Poly[[pentaaquabis(μ3-hydrogen squarato)barium] monohydrate]

“…2002) have already been published. Recently, we reported the crystal structures of a hemihydrate barium strontium hydrogen squarate (Trifa et al 2011) and strontium hydrogen squarate (Bouhali et al 2011). This paper describes the synthesis and crystal structure of the title compound, (I).…”

“…It is particularly interesting to compare the crystal structure of this compound with that of its corresponding hemi hydrate barium strontium hydrogen squarate, [Ba 0.35 Sr 0.65 (HC 4 O 4 ) 2 (H 2 O) 5 ], 0.5H 2 O (Trifa et al 2011). Indeed both structures can be described by chains connected by hydrogen squarate group, However, we can note the following important differences: the presence of Ba/SrO 9 polyhedra in the barium strontium hydrogen squarate and a different space group (C2/c) and lattice parameters.…”