HxRuO2 acts as a standalone catalyst exhibiting selective hydrogenation under mild conditions. Mobile protons embedded in the oxide lattice play an important role in stabilizing the distorted structure, and facile proton dynamics is key to improving catalytic properties.
Gallium has two isotopic nuclear magnetic resonance (NMR)-active nuclei, 69Ga and 71Ga, both of which have a com mon spin of I = 3/2 but different quadrupole moments, Q = 1.68 x 10-29 m2 and Q = 1.06 x 10-29 m2, respectively.Aluminum, which is chemically similar to Ga, has the quadrupole mo ment of Q = 1.49x 10-29 m2 which is intermediate between those of 69Ga and 71Ga.Well-resolved Ga magic angle spinning (MAS) NMR spectra are difficult to obtain because for a given electric field gradient (EFG) the central transitions (CTs) of 69Ga and 71Ga are broadened by a factor of about 11 and 4.8, respectively, compared to that of 27Al.1 Of the relatively few studies on the Ga MAS NMR spectra of Ga(III) compounds, most of these compounds have had oxygen-donor ligands.1In this work, the solid-state structures of two N,N-disubstituted dithiocarbamate complexes of trivalent gallium ion, Ga(S2 5 71Ga / ppm 5 69Ga / ppm
Wurtzite indium nitride (w-InN) powders synthesized from the reaction of indium oxide (In2O3) with ammonia were characterized by 115In magic-angle spinning (MAS) NMR spectroscopy and nitrogen analyzer. The powders were not a single phase of w-InN but a mixture of w-InN and In-incorporated w-InN. The incorporation of In metal in InN lattice due to thermal decomposition caused the 115In MAS NMR peak of w-InN to be downfield shifted and might be responsible for the increase in the band gap of w-InN.
triple quantum magic angle spinning (3QMAS) NMR spectra of several mordenite (MOR) sample were simulated with the point charge model method and compared with experimental 3QMAS spectra. Signal positions from different tetrahedral (T) sites in 3QMAS spectra are mainly governed by local structures of T sites such as T-O-T angles and T-O bond lengths. When preparation methods, cations in addition to Si/Al rations vary, the local structures of T sites in MOR change enough to alter signal patterns in 3QMAS of MOR. This inhibits to study the of Al distribution variation over 4 different T sites in mordenite during process such as dealumination by 3QMAS spectra.