Instrumentation nuclear magnetic resonance

In addition to search systems, artiheial intelligence-based computer programs seek to determine the structure or substructure from spectral proliles. Some of these programs use data from different types of instruments (nuclear magnetic resonance, mtiss. and IR spectrometers, etc.) to determine structures. ... 

See also Liquid Chromatography Overview Liquid Chromatography-Mass Spectrometry. Nuclear Magnetic Resonance Spectroscopy Overview Instrumentation. Nuclear Magnetic Resonance Spectroscopy Techniques Multidimensionai Proton. 

See also Extraction Solid-Phase Extraction. Food and Nutritional Analysis Oils and Fats Fruits and Fruit Products. Lab-on-a-Chip Technologies. Liquid Chromatography Liquid Chromatography-Nuclear Magnetic Resonance Spectrometry. Nuclear Magnetic Resonance Spectroscopy Oven/iew Principles Instrumentation. Nuclear Magnetic Resonance Spectroscopy Applications Food. Nuclear Magnetic Resonance Spectroscopy Techniques Solid-State. Peptides. Radiochemical Methods Radiotracers Pharmaceutical Applications. 

See also Drug Metabolism Metabolite Isolation and Identification. Nuclear Magnetic Resonance Spectroscopy Instrumentation. Nuclear Magnetic Resonance Spectroscopy-Applicable Elements Hydrogen Isotopes. Nuclear Magnetic Resonance Spectroscopy Applications Pharmaceutical. Nuclear Magnetic Resonance Spectroscopy Techniques Multidimensional Proton Surface Coil In Vivo Spectroscopy Using Localization Techniques. Polymers Synthetic. 

Overview Principles Instrumentation. Nuclear Magnetic Resonance Spectroscopy-Applicable Elements ... 

Specinfo, from Chemical Concepts, is a factual database information system for spectroscopic data with more than 660000 digital spectra of 150000 associated structures [24], The database covers nuclear magnetic resonance spectra ( H-, C-, N-, O-, F-, P-NMR), infrared spectra (IR), and mass spectra (MS). In addition, experimental conditions (instrument, solvent, temperature), coupling constants, relaxation time, and bibliographic data are included. The data is cross-linked to CAS Registry, Beilstein, and NUMERIGUIDE. 

Present day techniques for structure determination in carbohydrate chemistry are sub stantially the same as those for any other type of compound The full range of modern instrumental methods including mass spectrometry and infrared and nuclear magnetic resonance spectroscopy is brought to bear on the problem If the unknown substance is crystalline X ray diffraction can provide precise structural information that m the best cases IS equivalent to taking a three dimensional photograph of the molecule... 

The modern electronic industry has played a very important role in the development of instrumentation based on physical-analytical methods As a result, a rapid boom in the fields of infrared, nuclear magnetic resonance (NMR), Raman, and mass spectroscopy and vapor-phase (or gas-liquid) chromatography has been observed. Instruments for these methods have become indispensable tools in the analytical treatment of fluonnated mixtures, complexes, and compounds The detailed applications of the instrumentation are covered later in this chapter. 

Bovey, F A, Jelmski, L, Mirau, P A Nuclear Magnetic Resonance Spectroscopy, 2nd ed, Acadermc Press New York, 1988 Proton and Fluorine Nuclear Magnetic Resonance Spectral Data, Vanan Instruments/Japan Halon Tokyo, 1988... 

Some preliminary laboratory work is in order, if the information is not otherwise known. First, we ask what the time scale of the reaction is surely our approach will be different if the reaction reaches completion in 10 ms, 10 s, 10 min, or 10 h. Then, one must consider what quantitative analytical techniques can be used to monitor it progress. Sometimes individual samples, either withdrawn aliquots or individual ampoules, are taken. More often a nondestructive analysis is performed, the progress of the reaction being monitored continuously or intermittently by a technique such as ultraviolet-visible spectrophotometry or nuclear magnetic resonance. The fact that both reactants and products might contribute to the instrument reading will not prove to be a problem, as explained in the next chapter. 

Flexible superconducting tapes provide promise of uses for superconductors in motors, generators, and even electric transmission lines. Meanwhile, superconducting magnets cooled to the temperature of liquid helium already are in use. High-field nuclear magnetic resonance (NMR) spectrometers have become standard instruments in chemical research laboratories, and the same type of machine (called an MRI spectrometer) is used for medical diagnosis in hospitals worldwide. 

Electrochemical nuclear magnetic resonance (NMR) is a relatively new technique that has recently been reviewed (Babu et al., 2003). NMR has low sensitivity, and a typical high-held NMR instrument needs 10 to 10 NMR active atoms (e.g., spins), to collect good data in a reasonable time period. Since 1 cm of a single-crystal metal contains about 10 atoms, at least 1 m of surface area is needed to meet the NMR sensitivity requirement. This can be met by working with carbon-supported platinum... 

Local Structure of the Eu2+ Impurity. From the experimental perspective, the doping of lanthanide ions into solid state materials can be probed by different instrumental technics such as nuclear magnetic resonance (NMR),44 extended X-ray absorption fine structure (EXAFS),45,46 or electron paramagnetic resonance (EPR),47 which instead of giving a direct clue of the local geometry offers only data that can be corroborated to it. From the theoretical point of view,... 

Proton and carbon-13 nuclear magnetic resonance (NMR) spectra were recorded on a IBM Instruments 270 MHz NMR Spectrometer on 6-8 weight percent solutions in deuterated chloroform. Ultraviolet spectra were recorded on an IBM Ultraviolet Spectropluitometer Model 9420 using chloroform solutions containing 2 x 10-5 g/ml of the copolymers. 

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