Conformational analysis of 3,4-epoxytetrahydropyran by n.m.r. spectroscopy
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A kinetic study of thermal donor formation in 450 °C heat-treated modern silicon crystals has been performed and it is concluded that SiO3 complexes are the dominant thermal donor species (for heat-treatment times of up to about 100 h), rather than SiO4 complexes. Clusters containing a number of oxygen atoms other than three or four seem to be also electrically active.
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Nuclear magnetic resonance (NMR) spectroscopy is the most effective means for structural analysis of substances,which is rapidly developed in recent years. This article reviews applications of one-dimensional nuclear magnetic resonance spectroscopy (1D-1H NMR),2D-1H NMR including COSY(Correlation Spectroscopy),TOCSY(Total Correlation Spectroscopy),NOESY(Nuclear Overhauser Effect Spectroscopy),and ROESY(Rotating Frame Overhauser Effect Spectroscopy) in structure analysis of cyclodextrin and cyclodextrin complexes.
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Molecular formulas and what can be learned from them infrared spectroscopy nuclear magnetic resonance spectroscopy. Part One Basic concepts: nuclear magnetic resonance spectroscopy. Part Two Carbon-13 spectra, including heteronuclear coupling with other nuclei: nuclear magnetic resonance spectroscopy. Part Three Spin-spin coupling: nuclear magnetic resonance spectroscopy. Part Four Other topics in one-dimensional nmr: ultraviolet spectroscopy mass spectrometry combined structure problems nuclear magnetic resonance spectroscopy. Part Five Advanced nmr techniques.
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Polarization enhancement nurtured during attached nucleus testing (PENDANT) NMR spectroscopy gives signals of quaternary carbon atoms in addition to signals indicative of CH, CH2 and CH3 groups. In this study, using product operator theory, analytical description of PENDANT NMR spectroscopy for CHn (ISn, I = 1/2, S = 1/2, n = 0, 1, 2, 3) spin systems are presented. Simulation and experimental results of PENDANT NMR spectroscopy are also presented. Theoretical results are found to be in exact agreement with the simulation results and in good agreement with the experimental ones.
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Nuclear magnetic resonance (NMR) spectroscopy is usually combined with infrared (IR) spectroscopy for the complete analysis of the structure of an unknown molecule. IR spectroscopy is used to detect a functional group in the sample, whereas NMR spectroscopy detects number of atoms and their type in sample. NMR technique can detect many nuclei but mostly identifies carbon-hydrogen frameworks. In this chapter, we have comprehensively discussed the NMR spectroscopy, its types, basic mechanism along with its instrumentation, applications, advantages, and disadvantages.
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The sections in this article are 1 Introduction 2 31 P Magnetic Resonance Spectroscopy 3 2 H Magnetic Resonance Spectroscopy 4 13 C Magnetic Resonance Spectroscopy 5 19 F Magnetic Resonance Spectroscopy 6 1 H Magnetic Resonance Spectroscopy 7 Summary 8 Biographical Sketches Related Articles
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