Chemistry of fluorenylidene. Direct observation of, and kinetic measurements on, a singlet and a triplet carbene at room temperature

1980 ◽  
Vol 102 (18) ◽  
pp. 5958-5960 ◽  
Author(s):  
Joseph J. Zupancic ◽  
Gary B. Schuster
Keyword(s):  
Direct Observation ◽  
Room Temperature ◽  
Kinetic Measurements ◽  
Triplet Carbene

Direct observation of modulation structure in room-temperature multiferroic Bi4.2K0.8Fe2O9+δ

2021 ◽  
Vol 196 ◽  
pp. 113752
Author(s):  
Lu Zhang ◽  
Huanfang Tian ◽  
Sining Dong ◽  
Dong Yang ◽  
Xiaoguang Li ◽  
...  
Keyword(s):  
Direct Observation ◽  
Room Temperature

scholarly journals Direct Observation of Dynamic Symmetry Breaking above Room Temperature in Methylammonium Lead Iodide Perovskite

2016 ◽  
Vol 1 (4) ◽  
pp. 880-887 ◽  
Author(s):  
Alexander N. Beecher ◽  
Octavi E. Semonin ◽  
Jonathan M. Skelton ◽  
Jarvist M. Frost ◽  
Maxwell W. Terban ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Direct Observation ◽  
Room Temperature ◽  
Dynamic Symmetry ◽  
Lead Iodide ◽  
Methylammonium Lead Iodide

scholarly journals Direct Observation at Room Temperature of the Orthorhombic Weyl Semimetal Phase in Thin Epitaxial MoTe2

2018 ◽  
Vol 28 (33) ◽  
pp. 1802084 ◽  
Author(s):  
Polychronis Tsipas ◽  
Sotirios Fragkos ◽  
Dimitra Tsoutsou ◽  
Carlos Alvarez ◽  
Roberto Sant ◽  
...  
Keyword(s):  
Direct Observation ◽  
Room Temperature ◽  
Weyl Semimetal

Polysulfonylamine, XXXVI Trimethylsilyl-dimesylamin: Darstellung, NMR-spektroskopische Charakterisierung und Reaktionsfähigkeit als Silylierungsreagens / Polysulfonylamines, XXXVI Trimethylsilyl Dimesylamine: Preparation, NMR-Spectroscopic Characterization, and Reactivity as a Silylating Agent

1992 ◽  
Vol 47 (12) ◽  
pp. 1693-1700 ◽  
Author(s):  
Armand Blaschette ◽  
Elke Wieland ◽  
Thomas Hamann ◽  
Robin K. Harris
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Spectroscopic Characterization ◽  
Equilibrium Mixture ◽  
Molar Ratio ◽  
Efficient Catalyst ◽  
Kinetic Measurements ◽  
X Ray Crystallography ◽  
H Nmr ◽  
Silylating Agent

(CH3)3SiN(SO2CH3)2 (1), m. p. 69-70 °C, is obtained by metathesis of AgN(SO2CH3)2 with (CH3)3SiCl (improvement of a known procedure) or, more conveniently, by silylation of HN(SO2CH3)2 with [(CH3)3Si]2NH. The 1H, 13C and 29Si NMR solution spectra and the 29Si NMR solid-state spectrum suggest the constitution of 1 in solution (CDC13, CD2C12, CDCl2–CDCl2) to be an equilibrium mixture of the N-silylated form (CH3)3Si–N(SO2CH3)2 (I) and the O-silylated form (CH3)3Si–O–S(O)(CH3)=NSO2CH3 (II) in a molar ratio of 2:1 at room temperature, whereas in the known crystal structure of 1 only form I is present. The solid-state NMR experiment acted as a bridge between X-ray crystallography and solution-state NMR, enabling assignments of the resonances to be made with confidence to the tautomers. At room temperature, form II undergoes a rapid intramolecular 1.5-migration of silicon between oxygen centers of the two sulfonyl groups. As shown by kinetic measurements using 1H NMR spectroscopy, 1 is a highly reactive agent for silylating ketones in the presence of triethylamine. Hydroxy and thiol functions, even when sterically hindered, are silylated by 1 in uncatalyzed reactions. It is further shown that HN(SO2CH3)2 is an efficient catalyst for silylations with [(CH3)3Si]2NH.

Direct observation of resistive switching memories behavior from nc-Si embedded in SiO2 at room temperature

2012 ◽  
Vol 358 (17) ◽  
pp. 2348-2352 ◽  
Author(s):  
Guoyin Xia ◽  
Zhongyuan Ma ◽  
Xiaofan Jiang ◽  
Huafeng Yang ◽  
Jun Xu ◽  
...  
Keyword(s):  
Resistive Switching ◽  
Direct Observation ◽  
Room Temperature
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