Hydrothermal reaction between 5-bromoisophthalic acid (H2BIPA) and Zn(NO3)2·6H2O at the presence of the second ligand of 2-(2-pyridyl)imidazole (Hpyim) yields a new 3D metal-organic coordination polymer [Zn2(OH)(...Hydrothermal reaction between 5-bromoisophthalic acid (H2BIPA) and Zn(NO3)2·6H2O at the presence of the second ligand of 2-(2-pyridyl)imidazole (Hpyim) yields a new 3D metal-organic coordination polymer [Zn2(OH)(pyim)(BIPA)]n (1),which has been characterized by single-crystal X-ray diffraction,elemental analysis,IR spectrum and thermal analysis. Complex 1 presents an α-Po net with 41263 topology constructed from tetranuclear clusters and displays strong luminescent emission at room temperature.展开更多
Great interest has been focused on the rapidly expanding field of the construction of novel functional metal-organic frameworks(MOFs)owing to their variety of intriguing architectures and topologies and their potentia...Great interest has been focused on the rapidly expanding field of the construction of novel functional metal-organic frameworks(MOFs)owing to their variety of intriguing architectures and topologies and their potential applications in展开更多
This paper describes syntheses and structure determination of four lanthanide complexes [Nd(2-Cl-4-FBA) 3 phen] 2 (1, 2-Cl-4-FBA = 2-chloro-4-fluorobenzoate, phen = 1,10-phenanthroline), [Ln(2,5-DClBA) 3 phen] 2 (Ln =...This paper describes syntheses and structure determination of four lanthanide complexes [Nd(2-Cl-4-FBA) 3 phen] 2 (1, 2-Cl-4-FBA = 2-chloro-4-fluorobenzoate, phen = 1,10-phenanthroline), [Ln(2,5-DClBA) 3 phen] 2 (Ln = Sm(2) and Tb(3), 2,5-DClBA = 2,5-dichlorobenzoate) and [Sm(2-Cl-4,5-DFBA) 3 (phen)(H 2 O)] 2 (4, (2-Cl-4,5-DFBA = 2-chloro-4,5-difluorobenzo- ate). The complexes were characterized by elemental analysis, infrared and ultraviolet spectra, and X-ray single-crystal diffraction. In the molecular structures of 1 4, two Ln 3+ ions are linked by four carboxyl groups, with two of them in a bridging bidentate mode and the other two in a bridging-chelating tridentate mode, forming four binuclear molecules. In addition, each Ln 3+ ion is also chelated to one phen molecule and one carboxyl group in the complexes, except each Sm 3+ ion in 4 which is bonded to one carboxyl group by unidentate mode and one H 2 O molecule. There are two different coordination polyhedrons for each Nd 3+ ion in the two similar molecular structures of 1 and they are a distorted monocapped square antiprismatic and a distorted tricapped triangular prism conformation, respectively. The coordination polyhedron for each Ln 3+ ion in 2 4 is a nine-coordinated distorted mono-capped square antiprismatic conformation. The complex 3 exhibits green luminescence under the radiation of UV light. The thermal decomposition behaviors of the complexes have been discussed by simultaneous TG/DSC-FTIR technique. The 3D surface graphs for the FTIR spectra of the evolved gases were recorded and the gaseous products were identified by the typical IR spectra obtained at different temperatures from the 3D surface graphs. Meanwhile, we discussed the nonisothermal kinetics of 1 4 by the integral isoconversional non-linear (NL-INT) method.展开更多
文摘Hydrothermal reaction between 5-bromoisophthalic acid (H2BIPA) and Zn(NO3)2·6H2O at the presence of the second ligand of 2-(2-pyridyl)imidazole (Hpyim) yields a new 3D metal-organic coordination polymer [Zn2(OH)(pyim)(BIPA)]n (1),which has been characterized by single-crystal X-ray diffraction,elemental analysis,IR spectrum and thermal analysis. Complex 1 presents an α-Po net with 41263 topology constructed from tetranuclear clusters and displays strong luminescent emission at room temperature.
文摘Great interest has been focused on the rapidly expanding field of the construction of novel functional metal-organic frameworks(MOFs)owing to their variety of intriguing architectures and topologies and their potential applications in
基金the National Natural Science Foundation of China (21073053,21073052 and 20773034)the Natural Science Foundation of Hebei Province (B2012205022)
文摘This paper describes syntheses and structure determination of four lanthanide complexes [Nd(2-Cl-4-FBA) 3 phen] 2 (1, 2-Cl-4-FBA = 2-chloro-4-fluorobenzoate, phen = 1,10-phenanthroline), [Ln(2,5-DClBA) 3 phen] 2 (Ln = Sm(2) and Tb(3), 2,5-DClBA = 2,5-dichlorobenzoate) and [Sm(2-Cl-4,5-DFBA) 3 (phen)(H 2 O)] 2 (4, (2-Cl-4,5-DFBA = 2-chloro-4,5-difluorobenzo- ate). The complexes were characterized by elemental analysis, infrared and ultraviolet spectra, and X-ray single-crystal diffraction. In the molecular structures of 1 4, two Ln 3+ ions are linked by four carboxyl groups, with two of them in a bridging bidentate mode and the other two in a bridging-chelating tridentate mode, forming four binuclear molecules. In addition, each Ln 3+ ion is also chelated to one phen molecule and one carboxyl group in the complexes, except each Sm 3+ ion in 4 which is bonded to one carboxyl group by unidentate mode and one H 2 O molecule. There are two different coordination polyhedrons for each Nd 3+ ion in the two similar molecular structures of 1 and they are a distorted monocapped square antiprismatic and a distorted tricapped triangular prism conformation, respectively. The coordination polyhedron for each Ln 3+ ion in 2 4 is a nine-coordinated distorted mono-capped square antiprismatic conformation. The complex 3 exhibits green luminescence under the radiation of UV light. The thermal decomposition behaviors of the complexes have been discussed by simultaneous TG/DSC-FTIR technique. The 3D surface graphs for the FTIR spectra of the evolved gases were recorded and the gaseous products were identified by the typical IR spectra obtained at different temperatures from the 3D surface graphs. Meanwhile, we discussed the nonisothermal kinetics of 1 4 by the integral isoconversional non-linear (NL-INT) method.
