Journal ArticleDOI
Radiation Damage in Organic Crystals. II. Electron Spin Resonance of (CO2H)CH2CH(CO2H) in β-Succinic Acid
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TLDR
In this paper, an analysis of the electron spin resonance of x-irradiated single crystals of β-succinic acid was performed and it was shown that the principal long-lived paramagnetic species produced by the radiation damage is (CO2H)CH2-H(CO 2H)Abstract:
An analysis of the electron spin resonance of x‐irradiated single crystals of β‐succinic acid shows that: (a) the principal long‐lived paramagnetic species produced by the radiation damage is (CO2H)CH2–ĊH(CO2H); (b) the radical is oriented in the crystal lattice in nearly the same way that the parent succinic acid molecule is oriented in the undamaged lattice; (c) the strongly anisotropic hyperfine interaction due to the σ proton is very nearly the same as that previously found for the σ proton in the malonic acid radical, (CO2H)ĊH(CO2H). In these molecules the σ proton is directly bonded to the carbon atom on which the odd electron is largely localized. The two methylene protons in the radical are not equivalent, and their hyperfine interactions are nearly isotropic, and in the range 80–100 Mc.read more
Citations
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Electron spin resonance studies of transient alkyl radicals
TL;DR: In this article, the ESR lines are found to be narrow; considerable fine structure is observable, permitting positive assignment of the radical species, and accurate hyperfine constants are reported for 21 alkyl and cycloalkyl radicals, including several deuterated species.
Journal ArticleDOI
Chemistry of organosilicon compounds
TL;DR: In this paper, two 1,2-disilacyclobutenes were prepared by the reaction of tetramethyldisilene with acetylenes, and several reactions of these new 1 2 disilacy clobutenets including oxidation, silylene insertion, iron carbonyl insertion, and addition to acetylene and dienes are reported.
Journal ArticleDOI
Paramagnetic NMR in solution and the solid state
TL;DR: The different languages used by the NMR, EPR, quantum chemistry/DFT, and magnetism communities are unify to provide a comprehensive and coherent theoretical description of paramagnetic NMR.
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Paramagnetic Resonance Study of Liquids during Photolysis: Hydrogen Peroxide and Alcohols
Ralph Livingston,Henry Zeldes +1 more
TL;DR: In this article, the paramagnetic resonance spectra of free radicals in liquids have been studied during the course of intense irradiation with ultraviolet light, in which the liquid sample flows through the microwave cavity of the spectrometer and is photolyzed as it passes the sensitive region of the cavity.
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Implanted muon studies in condensed matter science
TL;DR: The positive muon is a unique microscopic probe when it is implanted in condensed matter, the evolution of its spin polarisation may be readily monitored to give information on the crystallographic or molecular sites it occupies, the local fields it experiences and the time dependence of these fields as mentioned in this paper.
References
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Journal ArticleDOI
Theory of Isotropic Hyperfine Interactions in π‐Electron Radicals
TL;DR: In this paper, a linear relation between the hyperfine splitting due to proton N, aN, and the unpaired spin density on carbon atom N, ρN, n = QρN is derived under very general conditions.
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Theory of anisotropic hyperfine interactions in π-electron radicals
TL;DR: Anisotropic proton hyperfine interactions in π-electron radicals are approximated by a magnetic dipole interaction between each proton and an electron spin magnetization that is distributed in 2s and 2p Slater atomic orbitals centred on carbon atoms.
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Radiation Damage in Organic Crystals. I. CH(COOH)2 in Malonic Acid1
TL;DR: In this paper, an analysis of the electron magnetic resonance of single crystals of malonic acid that were subjected to x-ray damage indicates that the principal long-lived paramagnetic species produced by the xray darnage is a pi-electron radical, that the unpaired electron is concentrated almost entirely on the alpha -carbon and that the spin density on the sigma -proton is negative.
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Hyperconjugation in the electron resonance spectra of free radicals
TL;DR: The electron resonance hyperfine splitting of a H produced by protons of a methyl group attached to one of the aromatic carbon atoms of a π-electron radical is calculated by the valence bond theory, treating the exchange interaction between the odd electron and the methyl group as a perturbation.
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Spin Density Matrices for Paramagnetic Molecules
TL;DR: In this article, the exact wave function for the molecule Ψ is built up from one-electron basis functions ψi, and the normalized spin density function ρ(x, y, z) can be expressed in terms of the ψI and the spin density matrix ρij ρ (x,y,z)= ∑ ijρijψj*ψi.