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Author : George C. Levy
Release : 1979
Genre : Science
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Nitrogen-15 Nuclear Magnetic Resonance Spectroscopy by : George C. Levy
Download or read book Nitrogen-15 Nuclear Magnetic Resonance Spectroscopy written by George C. Levy. This book was released on 1979. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G.J. Martin
Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 729/5 ( reviews)
Book Synopsis 15N-NMR Spectroscopy by : G.J. Martin
Download or read book 15N-NMR Spectroscopy written by G.J. Martin. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: After the proton and carbon, nitrogen is, with oxygen, the most impor tant atom in organic and especially bioorganic molecules. However, the development of nitrogen spectroscopy is indeed very recent. This is due to the fact that nitrogen-14, which is the naturally abundant iso tope, suffers, for structural studies, from the disadvantages inherent in nuclei with a quadrupolar moment (Table 1.1). Actually, indirect 15N measurements were reported in the early days of double resonance spectroscopy and the first direct detection of 15N resonance signals at the natural abundance level was realized in 1964 (R 17) at 4.33 MHz 1 (~ 1T) using a 15 mm o.d. cell in the field sweep mode (~ 0.16 min- ). Signal-to-noise ratios only of 3-4 were obtained for neat liquids and this low sensitivity of the 15N resonance still remains the main dis advantage for 15 spectroscopy (Table 1.1). However, nitrogen-15 has, N probably more than any other nucleus, benefited from the advances of NMR technology, i.e. Fourier transformation, multinuclear facilities, wide-bore super conducting solenoids, and, with the new generation of spectrometers, 15N-NMR is entering the field of routine investigation. Nevertheless, in spite of these spectacular improvements, obtaining 15N spectra of diluted species or large biochemical molecules is often not very easy and a good knowledge of the relaxation properties pecu liar to 15N may be necessary in order to adjust the pulse sequences and the decoupler duty cycle correctly (Section 2).
Author : Alastair Ian White
Release : 1972
Genre : Chemistry, Organic
Kind : eBook
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Book Synopsis Nitrogen-15 Nuclear Magnetic Resonance Spectroscopy by : Alastair Ian White
Download or read book Nitrogen-15 Nuclear Magnetic Resonance Spectroscopy written by Alastair Ian White. This book was released on 1972. Available in PDF, EPUB and Kindle. Book excerpt:
Author : RL. LICHTER
Release : 1979
Genre :
Kind : eBook
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Book Synopsis Nitrogen 15 Nuclear Magnetic Resonance Spectroscopy by : RL. LICHTER
Download or read book Nitrogen 15 Nuclear Magnetic Resonance Spectroscopy written by RL. LICHTER. This book was released on 1979. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J.B. Lambert
Release : 2012-12-06
Genre : Mathematics
Kind : eBook
Book Rating : 303/5 ( reviews)
Book Synopsis The Multinuclear Approach to NMR Spectroscopy by : J.B. Lambert
Download or read book The Multinuclear Approach to NMR Spectroscopy written by J.B. Lambert. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: The field of nuclear magnetic resonance has experienced a number of spectacular developments during the last decade. Fourier transform methodology revolutionized signal acquisition capabilities. Superconducting magnets enhanced sensitivity and produced considerable improvement in spectral dispersion. In areas of new applicat ions, the life sciences particularly bene fited from these developments and probably saw the largest increase in usage. NMR imaging promises to offer a noninvasive alternative to X rays. High resolution is now achievable with solids, through magic angle spinning and cross polarization, so that the powers of NMR are applicable to previously intractable materials such as polymers, coal, and other geochemicals. The ease of obtaining relaxation times brought an important fourth variable, after the chemical shift, the coupling constant, and the rate constant, to the examination of structural and kinetic problems i~ all fields. Software development, particularly in the area of pulse sequences, created a host of useful tech niques, including difference decoupling and difference nuclear Overhauser effect spectra, multidimensional displays, signal enhancement (INEPT), coupling constant analysis for connectivity (INADEQUATE), and observation of specific structural classes such as only quaternary carbons. Finally, hardware development gave us access to the entire Periodic Table, to the particular advan tage of the inorganic and organometallic chemist. At the NATO Advanced Study Institute at Stirling, Scotland, the participants endeavored to examine all these advances, except imaging, from a multidisciplinary point of view.
