Abstract
An interaction of water-methanol solution of sodium1,4-benzenediacetate (bda) and 4,4′-bipyridylethelene (bpee) with aqueous solution of Zn(NO3)2·6H2O at room temperature yielded colourless crystals of 1 after three weeks in a sealed glass tube. The compound with composition C22H18ZnN2O4 crystallizes in monoclinic space group P21/c, with the following cell dimensions: a = 10.4566(2), b = 13.3085(2), c = 13.7189(2) Å, β = 101.491(1)°. In the structure of 1, two Zn(II) neighbours are connected by two bda ligands adopting chelating and bidentate-bridging coordination modes to form a dimeric unit (Zn2O8N4) with the Zn–Zn distance of 4.0432(6) Å. The carboxyl-bridged dimeric units are extended along the [001] direction by bpee co-ligands and further linked by bda ligand to form a three-dimensional network structure. The IR shows the characteristic bands of the carboxylates at 1611/1507 cm−1 and 1424/1373 cm−1, respectively, for asymmetric and symmetric stretching −CO2− vibrations. The separation ∆[νasym(CO2−) − νsym(CO2−)] values of 187 and 134 cm−1 are indicative of chelating and bidentate bridging coordination modes of the carboxylate to the metal centre.
Highlights
Metal–organic framework (MOF) materials have received a great deal of attention for their unique properties, and for their potential applications owing to their diversity in topological architectures [1,2,3,4]
Versatile carboxylate ligands derived from 1,4-benzenedicarboxylic acid, 1,3,5-benzenetricarboxylic acid, 1,2,4,5-benzenetetracarboxylic acid, or pyridine-2,4-dicarboxylic acid are commonly used owing to their abundant carboxylate groups possessing high affinity to metal cations [7,8,9]
The zinc(II)-coordination polymer was prepared by layering an aquo-methanol solution of the ligand on top of aqueous solution of the metal ion in a glass tube and allowing to stand at room temperature for three weeks
Summary
Metal–organic framework (MOF) materials have received a great deal of attention for their unique properties, and for their potential applications owing to their diversity in topological architectures [1,2,3,4]. Versatile carboxylate ligands derived from 1,4-benzenedicarboxylic acid, 1,3,5-benzenetricarboxylic acid, 1,2,4,5-benzenetetracarboxylic acid, or pyridine-2,4-dicarboxylic acid are commonly used owing to their abundant carboxylate groups possessing high affinity to metal cations [7,8,9]. Other functionalized ligands such as 1,2-bis(4-pyridyl)ethylene, 1,4-benzenediacetic acid, 4,40 -bipyridylethene, or 3-nitro-1,2-benzenedicarboxlic acid have been extensively used under diverse synthetic conditions to prepare MOFs [10,11,12,13,14,15,16,17], which are used in several applications [18,19,20,21,22]. We have been able to prepare a zinc(II)-coordination polymer, C22 H18 ZnN2 O4 , 1, with a three-dimensional structure, incorporating the two ligands, via solvent diffusion technique
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