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.
= 3-nitro-1,2-benzenedicarboxylic acid, 2,2 -bpy = 2,2 -bipyridine, 4,4 -bpy = 4,4 -bipyridine), have been synthesized and structurally characterized. Complex 1 is a 0-dimensional (0D) framework, but face-to-face π -π stacking interactions and O-H···O hydrogen bonds extend these molecules into a 3D supramolecular framework. X-ray structure analysis reveals that complexes 2 exhibit a 2-dimensional (2D) network structure. Also, IR spectra, fluorescence properties, thermal decomposition process, and powder X-ray diffraction of the complexes were investigated.Keywords 3-nitro-1, 2-benzenedicarboxylic acid, carboxylate group, X-ray crystal diffraction
INTRODUCTIONOver the past two decades, the crystal engineering of coordination complexes (CCs) has provoked unparalleled attention and imagination within coordination chemistry based on assembly of judiciously chosen metal ions (joints) and multifunctional organic ligands (struts). Much effort has been devoted to controlling the structures of CCs because their intriguing properties and potential applications are strongly dependent on their structures. [1] Despite some recent advancement, the ability to predict and control the supramolecular assembly remains a longstanding challenge, and much more elaborate and systematic work is required to comprehend the inter-and intramolecular forces that determine the fashions of molecular structure and crystal packing in the solid state. A better understanding of the influence factors of structure, including inbeing of the metal ions and the predesigned organic ligands [2] as well as other factors such as the medium, [3] the pH value of the solution, [4] the temperature, [5]
A novel lanthanum cadmium complex [LaCd(bpy) 4 (NO 3 ) 5 ] (where bpy = 2,2 -Bipyridine) has been synthesized and structurally characterized by X-ray diffraction method, elemental analysis, spectral method (IR), powder X-ray diffraction (XRD), electronic spectra (UV-vis) and photoluminescence properties. The complex crystallizes in the monoclinic space group P21/c with unit cell parameters a = 16.883(2) Å, b = 14.382(2) Å, c = 18.981(3) Å, β = 96.806(2), V = 4576.5(11) Å 3 , and Z = 4. The complex is completed by two crystallographically and chemically independent, octahedrally coordinated Cd(II) ion and icosahedronly coordinated La(III) ion. The electronic spectra and photoluminescence of the complex has been described.
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