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Colourless crystals of polymeric diaqua­tetrakis(μ-1,2-benzene­dicarboxyl­ato)di-μ-nitrato-pentastrontium(II), [Sr5(C8H4O4)4(NO3)2(H2O)2]n, crystallized at the phase boundary of an aqueous silica gel containing sodium phthalate (1,2-benzene­dicarboxyl­ate) and an aqueous solution of Sr(NO3)2. Three crystallographically distinct SrII ions, one located on a centre of symmetry, are connected by two crystallographically distinct phthalate anions, one nitrate anion and a water molecule, to form a layered coordination polymer. These layers, perpendicular to [001], are held together by weak interatomic forces, as no interlayer hydrogen bonds were found.

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Yellow crystals of the title compound, poly[[aqua­lithium(I)]-μ3-iodo­fumarato], [Li(HOOC—CH=CI—COO)(H2O)]n, crystallized unexpectedly from an aqueous solution containing acetyl­ene­dicarboxylic acid and LiI. The lithium cation is coordinated tetra­hedrally by four O atoms of three iodo­fumarate anions and one water mol­ecule. These tetra­hedra are connected such that a layered coordination polymer is formed.

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From a solution of [Zn(H2O)6](NO3)2 and acetyl­enedicarb­oxylic acid in deionized water, single crystals of zinc acetyl­ene­dicarboxyl­ate dihydrate, {[Zn(C4O4)(H2O)2]}n, were obtained by slow evaporation of the solvent. The asymmetric unit consits of one zinc cation which is located on a centre of symmetry, half of an acetyl­enedicarboxyl­ate anion, the anion lying on a twofold axis, and one water mol­ecule in a general position. Thus, zinc is octa­hedrally coordinated by four O atoms of acetyl­enedicarboxyl­ate anions and two water mol­ecules in trans positions. These octa­hedra are connected by dicarboxyl­ate ligands into a three-dimensional network.
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