Results 151 to 160 of about 5,208 (187)

NMR studies of molecular motion in tetramethylammonium hydroxide pentahydrate

Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 1990
Polycrystalline (CH3)4NOH·5 H2O (I) and (CH3)4NOD·5D2O (II) have been studied by1H NMR lineshapes, second moments and spin-lattice relaxation times and by2H NMR lineshapes as a function of temperature. From low temperatures the first motion to occur is reorientation of the internally rigid (CH3)4N+ ion about a uniqueC3′ axis (Eta = 8.37 kJ/mol forI,Ea =
C. I. Ratcliffe, S. K. Garg, D. W. Davidson   +2 more
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Raman study on molecular motion in tetramethylammonium hydroxide pentahydrate

The Journal of Chemical Physics, 1991
The Raman spectrum as well as conductivity and differential-thermal-analysis (DTA) thermogram of tetramethylammonium hydroxide pentahydrate was observed at various temperatures in order to investigate molecular motion in relation to conductivity and a phase transition.
Isao Kanesaka, Makoto Iwaki, Chikayo Uezawa, Nobuhiro Kuriyama, Tetsuo Sakai, Hiroshi Miyamura, Hiroshi Ishikawa   +6 more
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Reduced Anisotropy in Tetramethylammonium Hydroxide Based Silicon Etchants

ECS Transactions, 2017
At sub-10 nm technology nodes, silicon etching is critical to FEOL processes such as FinFET thinning, gap filler removal, pre-III-V deposition etch, and nanowire release etching. The key to developing solutions for these applications is being able to control the anisotropy of the Si etch, or the etch selectivity between Si (111), Si (100), and Si ...
Glenn Westwood, Chien-Pin Sherman Hsu
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Condensation of diacetylene with carbonyl compounds in the presence of tetramethylammonium hydroxide

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1973
1 Tetramethylammonium hydroxide causes the condensation of carbonyl compounds in aqueous medium. 2. The methyl ethers of di- and tetraacetylenic glycols were obtained from tetramethylhexadiynediol.
S. I. Shergina, A. S. Zanina, I. E. Sokolov, I. L. Kotlyarevskii   +3 more
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Removal of acid from diesel by tetramethylammonium hydroxide/ethanol

Petroleum Science and Technology, 2016
ABSTRACTNaphthenic acid was removed by tetramethylammonium hydroxide as deacidification agent from diesel, and ethanol was used as extractant. The effect of parameters in the deacidification process was investigated systematically. The process parameters included mass fraction of deacidification agent, volume ratio of deacidification agent to diesel ...
Hu Zhen, Yu Hailian
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Temperature dependence of proton chemical shifts of aqueous sodium fluoride, sodium hydroxide, and tetramethylammonium hydroxide: the internal tetramethylammonium ion standard

Journal of the Chemical Society, Dalton Transactions, 1973
Proton chemical shifts have been determined over a range of temperature for water, and for aqueous sodium fluoride and sodium or tetramethylammonium hydroxide solutions using Me4N+ as an internal standard. The water results agree closely with those of Hindman and confirm that the shift temperature dependence is not constant over the range 0–100 °C. The
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Polyhedral Clathrate Hydrates. XI. Structure of Tetramethylammonium Hydroxide Pentahydrate

The Journal of Chemical Physics, 1966
The crystal structure of tetramethylammonium hydroxide pentahydrate has been determined at 25°C by an analysis of the three-dimensional x-ray-diffraction data. The unit cell is orthorhombic with a=12.57, b=10.96, c=7.91 Å and contains four formula units.
R. K. McMullan, T. C. W. Mak, G. A. Jeffrey   +2 more
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ChemInform Abstract: TEMPERATURE DEPENDENCE OF PROTON CHEMICAL SHIFTS OF AQUEOUS SODIUM FLUORIDE, SODIUM HYDROXIDE AND TETRAMETHYLAMMONIUM HYDROXIDE, THE INTERNAL TETRAMETHYLAMMONIUM ION STANDARD

Chemischer Informationsdienst, 1973
AbstractDie Ergebnisse für Wasser entsprechen denen von Hindman und bestätigen, daß die Temperaturabhängigkeit der chemischen Verschiebung im Temperaturbereich von 0‐100° nicht konstant ist.
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ChemInform Abstract: Tetramethylammonium Hydroxide

ChemInform, 1988
J. IMAHURA, C. AOBA, K. KOJIMA
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Tetramethylammonium Hydroxide

2021
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