ABSTRACT
3D pillar-layer framework with [24-MC-6] heterometallic crown clusters exhibits proton conductivity and selective sensing of acetone as well as Cu(2+) ions.
ABSTRACT
Four novel polyoxometalate-based copper(I)-organic frameworks, namely, [Cu(I)(2)(cis-L1)(2)][Cu(I)(2)(trans-L1)(2)Mo(6)O(18)(O(3)AsPh)(2)] (1), [Cu(I)(4)(L2)(4)Mo(6)O(18)(O(3)AsPh)(2)] (2), [Cu(I)(4)(L3)(4)Mo(6)O(18)(O(3)AsPh)(2)] (3), and [Cu(I)(4)(L4)(2)Mo(6)O(18)(O(3)AsPh)(2)] (4) (L1 = 1,3-bis(1,2,4-triazol-1-yl)propane, L2 = 1,4-bis(1,2,4-triazol-1-yl)butane, L3 = 1,5-bis(1,2,4-triazol-1-yl)pentane, and L4 = 1,6-bis(1,2,4-triazol-1-yl)hexane), have been successfully synthesized under hydrothermal conditions. Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, infrared spectra (IR), UV-vis spectra, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. Compound 1 is composed of two crystallographically independent and distinct polymeric motifs: one-dimensional (1D) S-shaped chain and two-dimensional (2D) undulated layer. The S-shaped chains penetrated into the 2D parallel layers to generate an unusual 1D + 2D â three-dimensional (3D) polypseudo-rotaxane framework. In 2, the As(2)Mo(6) polyoxoanions in tetradentate modes link four neighboring -L2-Cu-L2- chains to produce a rare 3D trinodal (3,4)-connected self-penetrated framework with Point Symbol of (8(3))(2)(8(2)·12(4)). In 3, adjacent Cu(I) atoms are linked by As(2)Mo(6) polyoxoanions and L3 ligands into a 2D layer. The layers are further interlocked by the two nearest neighboring ones to form a 3D polycatenated framework. In 4, L4 ligands bridge four Cu(I) atoms to yield 2D wavelike layers, which are further linked by the octadentate As(2)Mo(6) polyoxoanions to form a 3D tetranodal (3,4,6)-connected framework with Point Symbol of (6(3))(4·6(3)·8(2))(6(4)·8(2))(4(2)·6(2)·8(10)·10). In addition, the photocatalytic activities of compounds 1, 3, and 4 for decomposition of methylene blue (MB) under UV light have been investigated. Moreover, their electrochemical properties have also been studied in 1 M H(2)SO(4) aqueous solution.
ABSTRACT
We describe an exceedingly rare example of solid-state single-crystal-to-single-crystal transformation from a 2D layer to a known 3D framework via lattice iodine release, which involves the formation of a new Cu-O ligand bond and a change in the metal coordination geometry.
ABSTRACT
OBJECTIVE: To explore whether the nerve growth factor has protective effects on PC12 cells from injury induced by 2, 5-hexanedione. METHODS: With PC12 cells as the model of neurons, different concentrations of NGF were added into the culture of PC12 cells. Then cell viability was tested with MTT. The DNA fragment was observed with agarose gel electrophoresis. The apoptosis ratio was tested with flow cytometry (FACS). The p53 protein was detected with western blot. The differences among the groups were compared. RESULTS: Cell viabilities were increased with the increase of the concentrations of NGF (P < 0.05). The DNA fragment, the apoptosis ratio and the expression of p53 were all decreased with the increase of the concentrations of NGF (P < 0.05). CONCLUSION: The NGF might have direct nutritional effects on PC12 cells, and protect them from injury induced by 2, 5 HD. Moreover, it might also have anti-apoptosis effect to some extent.
