Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.003 Å; R factor = 0.034; wR factor = 0.106; data-to-parameter ratio = 13.1.In the title compound, {[Na(C 8 H 9 N 2 O 4 )(H 2 O)]Á0.5H 2 O} n , the Na + ion is coordinated by two bridging water molecules, one N atom and three O atoms from three 4-carboxy-2-propyl-1H-imidazole-5-carboxylate (H 2 pimdc) ligands. Adjacent Na + ions are linked alternately by two water O atoms and two carboxy O atoms into a chain along [001]. These chains are connected through the coordination of the carboxylate O atoms to the Na + ions, forming a three-dimensional structure. An intramolecular O-HÁ Á ÁO hydrogen bond and intermolecular N-HÁ Á ÁO and O-HÁ Á ÁO hydrogen bonds are present in the crystal structure.
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ExperimentalCrystal data [Na(C 8
Data collectionBruker APEX CCD diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996) T min = 0.528, T max = 0.562 5971 measured reflections 1986 independent reflections 1669 reflections with I > 2 (I) R int = 0.020
The title compound, {[ZnCl(C13H12F2N6O)2]Cl·2H2O}n, is a two-dimensional coordination polymer. The ZnII atom is six-coordinated by four N atoms from four 2-(2,4-difluorophenyl)-1,3-bis(1,2,4-triazol-1-yl)propan-2-ol (HFlu) ligands and by two Cl atoms in a distorted octahedral geometry. Two Cl atoms bridge two ZnII atoms, forming a centrosymmetric dinuclear unit. The HFlu ligands connect the dinuclear units into a 44 net parallel to (001) when the dinuclear unit is considered as a node. O—H⋯O and O—H⋯Cl hydrogen bonds link the cationic layer, free chloride anions and lattice water molecules. Intralayer π–π interactions between the triazole rings are observed [centroid–centroid distance = 3.716 (6) Å].
Two metal-organic frameworks based on the connectivity co-effect between rigid benzenedicarboxylic acid and bridging ligand have been synthesized [Zn 2 (3-NO 2 -bdc) 2 (4,4'-bpy) 2 H 2 O] n (1), [Co(3-NO 2 -bdc)(4,4'-bpy)H 2 O] n (2) (where 3-NO 2 -bdcH 2 = 3-nitro-1,2-benzenedicarboxylic acid, 4,4'-bpy = 4,4'-bipyridine). The two novel complexes were characterized by IR spectrum, elemental analysis, fluorescent properties, thermogravimetric analysis, single-crystal X-ray diffraction and powder X-ray diffraction (PXRD). X-ray structure analysis reveals that 1 and 2 are two-dimensional (2D) network structures. Complex 1 and complex 2 belong to triclinic crystal with P-1 space group. The luminescence measurements reveal that two complexes exhibit good fluorescent emissions in the solid state at room temperature. Also, thermal decomposition process and powder X-ray diffraction of complexes were investigated.
Source of materialAm ixture of pyridine-2,5-dicarboxylic acid (2.0 mmol, 0.3342 g), gadolinium oxide (1.0 mmol, 0.3625 g), zinc chloride (1.0 mmol, 0,1363 g), KOH (2.0 mmol, 0.102 g), and H 2 O (10 mL) was placed in aTeflon-lined autoclave heated to 433 K for three days. The autoclave was then allowed to cool to room temperature. Colorlessc rystalsw ere collected by filtration and washed repeatedly with distilled water and diethyl ether.
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