2,859 publications from this institution
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Donor–acceptor chromophores were synthesized by Knoevenagel condensation and characterized by using spectroscopic measurements (FT-IR, 1H NMR, 13C NMR, and mass) and elemental analyses. UV–Vis and fluorescence spectroscopic studies provided that these dyes are good absorbent and fluorescent. The results of photostability study showed that photobleaching of Dyes 2 and 4 was more significant than that of Dyes 1 and 3, providing that Dyes 1 and 3 are more photostable than Dyes 2 and 4. In addition, all dyes included in this study are found to be sensitive to the polarity of the microenvironment provided by different solvents based on the results of fluorescence polarity studies.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
This article highlights novel prospects for metal-organic frameworks (MOFs) in heterogeneous catalysis as having frustrated Lewis acid-base pairs (FLPs) or as bifunctional acid-base solid catalysts able to activate molecular hydrogen. Starting from the extensive application MOFs as Lewis acid and Lewis base catalysts, this article uses catalytic hydrogenation to briefly summarize the efforts made to heterogenize boron and amine in MOFs to mimic molecular FLP systems. The core of this concept is based on recent findings which demonstrate the ability of two commonly used MOFs, namely UiO-66 and MIL-101, to catalyze the selective hydrogenation of polar double X=Y bonds at moderate H<sub>2</sub> pressures below 10 bar. The influence of electron-donating, the withdrawal of substituents on the linker, and the aniline poisoning effect highlight the significance of Lewis acid sites, while density-functional theory calculations indicate the heterolytic H-H bond cleavage at the MOF metal oxo clusters. It is expected that this new perspective on MOFs as solid FLP systems will spur further research to explore and define the potential of dual sites in the catalytic activation of small molecules.