Surface and interface states of noble metal nanoparticles (MNPs), closely related to the catalytic performance, have been of great concern to academics in the field of catalysis. The catalytic property of MNPs was usually regulated through introducing modifier effects and metal−support effects, and the common nature of these strategies involved either the construction of steric hindrance on the surface of MNPs or the regulation of surface electronic state of MNPs, which inspired us to employ metal−organic frameworks (MOFs) as a support due to their tailorable physical-chemical environments. Herein, we utilized the MOF matrixes to encapsulate MNPs (MNPs@MOFs) as catalysts which showed good selectivity and high conversion in the hydrogenation reaction of the citronellal molecule.
Homogeneous and heterogeneous catalyzed reactions can seldom operate synergistically under the same conditions. Here we communicate the use of a single rhodium precursor that acts in both the homogeneous and heterogeneous phases for the asymmetric full saturation of vinylarenes that, to date, constitute an unmet bottleneck in the field. A simple asymmetric hydrogenation of a styrenic olefin, enabled by a ligand accelerated effect, accounted for the facial selectivity in the consecutive arene hydrogenation. Tuning the ratio between the phosphine ligand and the rhodium precursor controlled the formation of homogeneous and heterogeneous catalytic species that operate without interference from each other. The system is flexible in terms of both the chiral ligand and the nature of the external olefin. We anticipate that our findings will promote the development of asymmetric arene hydrogenations.
A highly efficient regio-and enantioselective 8 monohydrogenation of 1,4-dienes has been realized using an 9 iridium catalyst with a chiral N,P-ligand under mild conditions.
10The substrate scope was studied and included both unfunction-11 alized as well as functionalized substituents on the meta-or para-
A leather-based e-whisker with 3D conductive pathway was assembled by writing conductive ink on leather. The sensor possessed good durability, and was sensitive enough to detect a height difference of 50 μm, making it capable of surface texture detection, spatial distribution mapping, wind mapping, etc.
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