Topic
Hydrogen atom abstraction
About: Hydrogen atom abstraction is a research topic. Over the lifetime, 7059 publications have been published within this topic receiving 151781 citations.
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TL;DR: In this article, the nascent vibrational distribution of CH3 produced by the reaction O(1D2)+CH4→OH+CH3 (ΔH0=−182 kJ mol−1) has been investigated by infrared diode laser kinetic spectroscopy.
Abstract: The nascent vibrational distribution of CH3 produced by the reaction O(1D2)+CH4→OH+CH3 (ΔH0=−182 kJ mol−1) has been investigated by infrared diode laser kinetic spectroscopy. The reaction was initiated by the generation of O(1D2) atoms by excimer laser photolysis of N2O or O3 at a total pressure of 200 mTorr, and the ν2 (out‐of‐plane bending) bands of CH3, v2=1←0 up to 4←3, were measured as functions of time. The vibrational distribution of ν2 (v≤3) was found to be noninverted and much less excited than a prior distribution. The fraction of the available energy released to the ν2 vibration,
92 citations
TL;DR: It is concluded that alignment of methylene groups of the substrate at the active site is a major determinant of the reaction rate and the singular or dual specificity of lipoxygenases.
92 citations
TL;DR: The reaction between HE and the Fremy's salt should provide a facile route for the synthesis of 2-OH-E+, a diagnostic marker product of the HE/O2.- reaction.
92 citations
TL;DR: Coupled hydrogen bond systems have been shown to be interesting subjects of further research as discussed by the authors, for example, in ice, liquid water, hydroquinone clathrates, starch, cellulose, polypeptides, nucleic acids, and silicate hydrates.
Abstract: The “hydrogen bond” or “hydrogen bridge” concept has proved to be one of the most useful structural concepts in modern science. The properties of substances containing hydrogen bonds depend on the strength, symmetry, and polarity of these bonds. These characteristics, in turn, are related to the effective electronegativities of the bridgehead atoms, the distance between these atoms, and the degree of coupling with other hydrogen bonds. Symmetrical hydrogen bonds exist in the FHF− and H5O ions and in some acidic compounds. Coupled hydrogen bond systems exist, for example, in ice, liquid water, hydroquinone clathrates, starch, cellulose, polypeptides, nucleic acids, KH2PO4, and silicate hydrates. It is suggested that systems of coupled, nearly symmetrical, hydrogen bonds should be interesting subjects of further research.
92 citations
TL;DR: The difference between the Dirac and Schrödinger equations will be treated as a series of perturbations to the Schr Ödinger equation.
Abstract: Whilst the predictions of the quantum model of hydrogen are a very good approximation to reality, it turns out that in high resolution spectra of hydrogen that the predicted lines are in fact split into sets of lines. This is the so called fine structure of hydrogen and means that we must have missed out something from the model we have written down. When we wrote down the quantum model of the hydrogen atom we used the Schrödinger equation. The Schrödinger equation is the quantum equivalent to Newton’s equation of motion in as much as it is nonrelativistic. Just as with Newton’s equations non-relativistic quantum mechanics is a good approximation under many circumstances. However, it is known to fail under other circumstances. The extension of quantum mechanics to make it relativistic was made by Dirac who replaced the Schrödinger equation with the Dirac equation. We will not try to solve the Dirac equation. Instead, as in the small velocity limit the Dirac equation tends towards the Schrödinger equation, we will treat the difference between the Dirac and Schrödinger equations as a series of perturbations to the Schrödinger equation. For historic reasons the different perturbations have been named.
92 citations