Results 191 to 200 of about 5,973,776 (275)

Advances in steroid purification for novel techniques in carbon isotope ratio mass spectrometry of doping control. [PDF]

RSC Adv
Li Z, Cheng J, Zhao C, Chen Q, Liu B, Chen P.   +5 more
europepmc   +1 more source

Janus Reactivity of a Mononuclear Non‐Heme Iron(III)‐Peroxo Complex Toward Indole Oxidation

Angewandte Chemie, EarlyView.
The iron(III)‐peroxo complex [FeIII(O2)(12‐TMC)]+ exhibits bifurcating pathways in indole oxidation. N─H indoles undergo N─H H‐atom abstraction, supported by a KIE of 5.2 for N─H/N–D 2,3‐dimethylindoles, whereas N‐methylindoles react via electrophilic addition of the iron‐peroxo group to the C2–C3 double bond of the indole ring, forming iron ...
Wenjuan Zhu, Peng Wu, Binju Wang, Kallol Ray, Wonwoo Nam   +4 more
wiley   +2 more sources

A Novel Method to Determine the Carbon Isotopic Composition of Inositol Hexaphosphate (Phytate) in Soil by Gas Chromatography-Combustion-Isotope Ratio Mass Spectrometry. [PDF]

Rapid Commun Mass Spectrom
Sarangi V, Spohn M.
europepmc   +1 more source

Electron Bridge Enhanced Charge Polarization Enables Efficient and Ultra‐Long Stable Urea Electrosynthesis

Angewandte Chemie, EarlyView.
An electron bridge strategy is developed to regulate charge polarization in Pd1 and Ni1 dual single‐atom sites, promoting CO2 reduction, nitrate reduction, and C–N coupling simultaneously. The resulting catalyst achieves efficient urea electrosynthesis with high activity and record durability over 1700 h.
Fan Wu, Haixia Wang, Wei Wang, Junrong Zou, Ruijie Zhou, Fenglin Xie, Peng Gao, Weiliu Fan, Nana Wang, Zhongchao Bai, Guoxiu Wang, Wei Ye   +11 more
wiley   +2 more sources

Isotope Ratio Mass Spectrometry (IRMS)-Based Authentication of the Geographic Origins of <i>Volvariella volvacea</i> (Bull.) Singer. [PDF]

Foods
Liu X, Rao Q, Zhang Q, Geng H, Lu Y, Liu Z, Chen S, Li P, Song W.   +8 more
europepmc   +1 more source

Chemical attribution of the homemade explosive ETN - Part II: Isotope ratio mass spectrometry analysis of ETN and its precursors. [PDF]

Forensic Sci Int, 2020
Bezemer K, McLennan L, Hessels R, Schoorl J, van den Elshout J, van der Heijden A, Hulsbergen A, Koeberg M, Busby T, Yevdokimov A, de Rijke E, Schoenmakers P, Smith J, Oxley J, van Asten A.   +14 more
europepmc   +1 more source

Heavy‐Atom Tunneling at Room Temperature Revealed by Instanton Theory

Angewandte Chemie, EarlyView.
Usually, tunneling does not play a significant role in chemical reactions except at low temperature, especially when heavy atoms are involved. However, using nonadiabatic instanton theory we find that heavy‐atom tunneling dominates the reaction mechanism for spin‐forbidden processes in the synthesis of strained organic molecules even at room ...
Debaarjun Mukherjee, Kamil D. Petryczkiewicz, Jeremy O. Richardson   +2 more
wiley   +2 more sources

High-Precision Oxygen-Isotope Analysis of Iron (Oxyhydr)oxides Using High-Temperature Conversion Isotope Ratio Mass Spectrometry. [PDF]

Anal Chem
Galili N, Somlyay A, Aquila G, Wijker R, Gautschi P, Wacker L, Hemingway JD.   +6 more
europepmc   +1 more source

Controlled Hydrogen Delivery by Single‐Atom Ru Accelerates Electrocatalytic Ammonia Synthesis

Angewandte Chemie, EarlyView.
Single Ru atoms anchored on Co3O4 guide reactants along a hydrogen‐rich surface pathway, enabling efficient and selective conversion of NO to NH3. By linking atomic design to catalytic performance, this strategy clarifies the reaction mechanism and offers a versatile platform for engineering oxide catalysts for electrochemical ammonia synthesis ...
Zheng Liu, Xingchi Li, Zhenggang Xue, Jiayi Liu, Zhenlin Wang, Evangelina Pensa, Donglin Han, Jialing Song, Haiyan Duan, Chaoqi Zhang, Lupeng Han, Ming Xie, Yongjie Shen, Wenqiang Qu, Emiliano Cortes, Dengsong Zhang   +15 more
wiley   +2 more sources

Experimental assessment of elemental analyzer isotope ratio mass spectrometry normalization methodologies for environmental stable isotopes. [PDF]

Rapid Commun Mass Spectrom
Balint S, Schwartz M, Fowler DN, Linnekogel S, Clemons SC, Burkemper LK.   +5 more
europepmc   +1 more source