Results 91 to 100 of about 7,648,305 (248)

Beyond the Oxo‐Wall: Synthesis and Reactivity of a Six‐Coordinate Formally CoIV‐Oxo Complex

Angewandte Chemie, EarlyView.
We present the first example of a six‐coordinate formally Co(IV)‐oxo complex, [Co(TQA)(O)(OH)]+ (1), which exists as an admixture of CoIV‐oxo and CoIII‐oxyl resonance structures. Complex 1 is capable of performing oxygen atom transfer reactions and abstracting moderately strong hydrogen atoms at rates faster than other characterized CoIV‐oxo compounds.
Jason Shearer, Ellie Vaynberg, Devin F. Wilson, Kendal W. Southwell, Jindou Yang, Ying Xing, Wonwoo Nam   +6 more
wiley   +2 more sources

A numerical approach to 14C wiggle-match dating of organic deposits: best fits and confidence intervals [PDF]

, 2002
14C wiggle-match dating (WMD) of peat deposits uses the non-linear relationship between 14C age and calendar age to match the shape of a sequence of closely spaced peat 14C dates with the 14C calibration curve.
Heuvelink, Gerard B.M.,, Blaauw, Maarten, van der Plicht, J, Mauquoy, D., Blaauw, M., van der Plicht, J., Mauquoy, Dmitri,, van Geel, B, Mauquoy, Dmitri, Geel, Bas van,, Blaauw, M.A., Plicht, Johannes van der,, Johannes Van Der Plichtd, Bas Van Geela, Geel, B., van, Mauquoy, D, Gerard B. M. Heuvelinkb, van Geel, Bas, Dmitri Mauquoyc, Heuvelink, Gerard B.M., van Geel, B., Heuvelink, G.B.M., Maarten Blaauwa, Plicht, J., van der, Mauquoy, D.S., Blaauw, Maarten,, Heuvelink, GBM   +26 more
core   +1 more source

Tectonic setting and metallogenic chronology of the Ashele Cu–Zn deposit in Xinjiang, NW China: Constraints from Re-Os dating of pyrite, U-Pb dating of zircon and Hf isotopes

Ore Geology Reviews, 2019
Abstract The Ashele Cu-Zn deposit, an important volcanogenic massive sulfide (VMS) deposit, is located in the centre of the Ashele volcano-sedimentary basin of the Altay metallogenic belt, North Xinjiang, NW China. The No. 1 orebody is located between the roof basalt and the base tuff. The roof basalt yielded a zircon U-Pb age of 342 ± 4.6 Ma (MSWD = 
Ling-ling Gao, Ke-yong Wang, Chuan Chen, Xue-bing Zhang, Jian Li   +4 more
openaire   +1 more source

Exclusive Hydroformylation of Terminal Olefins: A Phosphorus‐Free Ruthenium System for the Selective Functionalization of Complex Mixtures

Angewandte Chemie, EarlyView.
Development of a phosphorus‐free Ru/DBU catalyst enabling highly chemo‐ and regioselective hydroformylation of terminal olefins, sparing internal double bonds. Optimization of reaction parameters, ligand effects, and substrate scope including industrial feedstocks was realized.
Mohamed Niyaz Vellala Syed Ali, Ida Ziccarelli, Dilver Peña Fuentes, Christoph Kubis, Robert Franke, Ralf Jackstell, Matthias Beller   +6 more
wiley   +1 more source

Atypical Condensation Domains Guide Discovery and Illuminate Biosynthesis of Myxoglucamides Featuring Vinyl‐Substituted, α‐Oxidized γ‐Amino Acids

Angewandte Chemie, EarlyView.
Genome mining of atypical condensation (C) domains leads to the discovery of myxoglucamides, glycolipopeptides featuring an unprecedented vinyl‐substituted, α‐oxidized γ‐amino acid. Biosynthetic studies reveal a discrete C‐domain‐like O‐acyltransferase, a β‐hydroxylation‐dependent chain‐extension checkpoint, and an unusual pathway for γ‐amino acid ...
Tingting Wang, Alexander Popoff, Maja Hunter, Guangzhi Dai, Ronald Garcia, Huixin Xu, Haowen Zhao, Asfandyar Sikandar, Liujie Huo, Rolf Müller, Chengzhang Fu   +10 more
wiley   +2 more sources

Modulating Covalent Organic Framework Nanochannel Microenvironments for Sustainable Hydrogen Peroxide Photosynthesis

Angewandte Chemie, EarlyView.
Alkoxy side chains regulate hydrazone‐linked COF nanochannel microenvironments by tuning pore polarity, reactant adsorption, and charge‐separation behavior. The optimized framework facilitates oxygen activation and hydrogen peroxide photosynthesis in real water and a 1 L natural‐sunlight reactor. LCA further shows that natural sunlight and larger‐scale
Ruixue Sun, Shaoyang Gao, Luqiao Feng, Peixuan Xie, Wenyu Shen, Nikita Rog, Marwan Mohammed, Qi Huang, Giulio Santori, Xianfeng Fan, Bien Tan, Cher Hon Lau   +11 more
wiley   +2 more sources

Maximizing Active Site Density in Tin Single‐Site Catalysts for Selective Carbon Dioxide to Formate Electroreduction

Angewandte Chemie, EarlyView.
High‐loading tin single‐site catalysts (>7.5 wt.% Sn) are synthesized using a nitrogen‐enriched carbon scaffold and mechanochemically assisted pyrolysis to stabilize atomically dispersed Sn. The resulting Sn/N‐C‐M catalyst enables highly selective CO2‐to‐formate conversion (>90% FE across 50–500 mA cm−2) with long‐term durability and operando‐verified ...
Katharina Potemkin, Soressa Abera Chala, Chia‐Yu Chang, Keseven Lakshmanan, Meng‐Che Tsai, Tobias Rios Studer, Elnaz Ebrahimi, Nico Achenbach, Rongji Liu, Johannes Biskupek, Ute Kaiser, Bing Joe Hwang, Carsten Streb   +12 more
wiley   +2 more sources

Gain‐of‐Function Engineering of the NifEN Scaffold Into a Self‐Assembling Nitrogenase

Angewandte Chemie, EarlyView.
From scaffold to enzyme: Systematic engineering of the cofactor maturation scaffold NifEN reconstructs the P→M electron relay along with cofactor coordination and proton gating at the S2B site, converting NifEN into a functional nitrogenase capable of ATP‐dependent N2 reduction both in vitro and in vivo.
Yimo Yang, Chi Chung Lee, Steve Ortiz, Markus W. Ribbe, Yilin Hu   +4 more
wiley   +2 more sources

Natural Sunlight IR‐Driven Highly Efficient Synthesis of Acetaldehyde From Bioethanol Over Cu/Fe2O3

Angewandte Chemie, EarlyView.
This work reports a Cu/Fe2O3 catalyst for the conversion of bioethanol into valuable acetaldehyde and green hydrogen under both infrared (IR) light and natural sunlight. This IR‐driven system sets a new performance benchmark, with TON and initial TOF enhanced by at least one order of magnitude, enabled by a constructed IR photon‐to‐phonon channel and ...
Xiyi Li, Jiangting Zhao, Junjun Guo, Ze‐Kai Yu, Enqi Chen, Qiong Liu, Tieou Wang, Asterios Gavriilidis, Xue‐Qing Gong, Yang Lan, Junwang Tang   +10 more
wiley   +2 more sources

Dating of hydrocarbons with Re-Os isotopes: Experimental investigation of the behavior of Re-Os in petroleum

, 2013
Le géochronomètre Re-Os a fait ses preuves dans son application aux huiles et bitumes pétroliers. Cependant, l’application de ce système sur les fluides pétroliers souffre d’un manque de compréhension de la géochimie pétrolière de Re et Os, des mécanismes de remise à zéro du géochronomètre et par conséquent des évènements réellement datés.
openaire   +1 more source