Electron Paramagnetic Spin Resonance Spectroscopy

EPR spectroscopy has been used in an extensive study of electron addition to 

A new spin-trap, 5-(diethoxyphosphorylmethyl)-5-methyl-4,5-dihydro-3H-pyrrole N-oxide (48), and its hydroxyl- and superoxide-spin adducts, have been compared with the analogues obtained with 5-(diethoxyphosphoryl)-5-methyl-4,5-dihydro-3H-pyrrole N-oxide (49 DEPMPO) and with 5,5-dimethyl-1-pyrroline N-oxide (50 DMPO), and overall the spin trapping behaviour of 48 was found to be more similar to that of DMPO than DEPMPO. 

EPR spectroscopy has been used to determine the bonding and structure in copper(II) complexes with N-(thio)-phosphorylated thioamides 51 in a study of the role of hydrogen atoms and hydroxyl radicals in glycerol-1-phosphate degradation, and in a thermo- and surface-chemistry study of dimyristoylpho-sphatidylcholine (DMPC) and dimyristoylphosphatidylglycerol (DMPG) bilayers in the (La + H2O) phase.EPR spectroscopy has also been used to characterise novel oligo(cation radicals) of methylene phosphoranes and di(cation radicals) of a 1,3-phenylene-bis(methylene phosphorane) (52).  

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Theoretical and computational chemistry methods Nuclear magnetic resonance spectroscopy Electron paramagnetic (spin) resonance spectroscopy Vibrational (IR and Raman) spectroscopy Electronic spectroscopy X-ray diffraction (XRD) structural studies Electrochemical methods... 

Electron paramagnetic resonance spectroscopy (HER), also called electron spin resonance spectroscopy (ESR), may be used for direct detection and conformational and structural characterization of paramagnetic species. Good introductions to F.PR have been provided by Fischer8 and I.effler9 and most books on radical chemistry have a section on EPR. EPR detection limits arc dependent on radical structure and the signal complexity. However, with modern instrumentation, radical concentrations > 1 O 9 M can be detected and concentrations > I0"7 M can be reliably quantified. 

The paramagnetism of the triplet state can be observed by electron spin resonance spectroscopy. This is perhaps the most reliable means of determining the existence of a triplet state since the ESR signals can be predicted using the following Hamiltonian operator ... 

Electron paramagnetic resonance spectroscopy (EPR) (also called electron spin resonance spectroscopy, ESR) has been scarcely applied in the field of art and art conservation. Some work can be found in which EPR is used as complementary technique to SEM-EDX, NMR, and mass spectrometry (MS) for studying free radicals occurring in polymerization, pyrolytic, oxidative, and other radical degradative processes in artwork, as well as in the characterization of varnishes and oleoresinous media [42]. 

Electron spin resonance spectroscopy (ESR), also known as electron paramagnetic resonance (EPR), is based on the property that an unpaired electron placed in a magnetic field shows a typical resonance energy absorption spectrum sensitive to its environment. Recently, this technique, which was primarily developed for biological studies of membrane properties, has been adapted for the study of adsorbed polymer/surfactant layers. The mobility of the ESR probe (stable free radical incorporated into the polymer or surfactant molecule) depends of orientation of the surfactant or polymer and the viscosity of the local environment around the probe. 

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