estimated accurately using the chemical shifts of an unassigned NMR spectrum.

The diagram at left shows a typical nuclear magnetic resonance ( NMR ) spectrum of a borane molecule.

A methane clathrate MAS NMR spectrum recorded at 275 K and 3. 1 MPa shows a peak for each cage type and a separate peak for gas phase methane.

Spectroscopic indicators are the D < sub > 2 </ sub > O-exchangeable SH signal in the < sup > 1 </ sup > H NMR spectrum (< sup > 33 </ sup > S is NMR active but signals for divalent sulfur are very broad and of little utility ).

The first NMR spectrum of a stable carbocation in solution was published by Doering et al.

The NMR spectrum established that it was non-classically bridged ( the first stable non-classical ion observed ).

In the NMR spectrum of a dimethyl derivative, two nonequivalent signals are found for the two methyl groups indicating that the molecular conformation of this cation not perpendicular ( as in A ) but is bisected ( as in B ) with the empty p-orbital and the cyclopropyl ring system in the same plane:

* In nuclear magnetic resonance spectra NMR, a nonet is a spectrum structure with nine peaks.

Nuclear magnetic resonance decoupling in nuclear magnetic resonance ( NMR ) spectroscopy is a method of simplifying resulting spectrum by irradiating the sample at a certain frequency or frequency range to eliminate fully or partially the effect of coupling between certain nuclei.

The isomerization of the S-bonded isomer to the N-bonded isomer occurs intramolecularly .< ref ><</ ref > In the complex, dichlorotetrakis ( dimethyl sulfoxide ) ruthenium ( II ), linkage isomerism of dimethyl sulfoxide ligands can be observed in the NMR spectrum due to the effect of S vs. O bonding on the methyl groups of DMSO.

1H ( proton ) NMR spectrum for 0. 037 grams of vanillin in. 5 milliliters of CDCl < sub > 3 </ sub > ( deuterated trichloromethane ) taken at 89. 56 MHz showing location correlated peaks.

This time-domain signal is typically digitised and then Fourier transformed in order to obtain a frequency spectrum of the NMR signal i. e. the NMR spectrum.

Lipscomb investigated, "... the carboranes, C < sub > 2 </ sub > B < sub > 10 </ sub > H < sub > 12 </ sub >, and the sites of electrophilic attack on these compounds using nuclear magnetic resonance ( NMR ) spectroscopy.

Hudson foresaw that the directors of the MCR would resist the idea and made a secret agreement with the B & DJR for the NMR to take it over.

Taylor, "< sup > 1 </ sup > H NMR in a-Si ", Physical Review B, 1982, v26, pp3605-3616.

The NMR phenomenon is achieved by placing a nucleus in a strong, static field B < sub > 0 </ sub > ( the " holding field ") and then applying a weak, transverse field B < sub > 1 </ sub > that oscillates at some radiofrequency ω < sub > r </ sub >.

* Gerstein, B. C. and Dybowski, C., Transient Techniques in NMR of Solids, Academic Press, San Diego, 1985.

Hudson foresaw that the directors of the MCR world resist the idea and made a secret agreement with the B & BJR for the NMR to take it over.

* James B. Aguayo-Martel, Ophthalmologist and pioneer of NMR imaging and spectroscopy, Chair of Surgery

X-ray crystal structures and < sup > 11 </ sup > B NMR spectroscopic analyses of the coordinated catalyst-borane complex 2 have provided support for this initial step.

Whereas < sup > 1 </ sup > H NMR spectroscopy is, in general, not useful for establishing the presence of a ketone, < sup > 13 </ sup > C NMR spectra exhibit signals somewhat downfield of 200 ppm depending on structure.

Decoherence times for candidate systems, in particular the transverse relaxation time T < sub > 2 </ sub > ( for NMR and MRI technology, also called the dephasing time ), typically range between nanoseconds and seconds at low temperature.

< sup > 51 </ sup > V has a nuclear spin of 7 / 2 which is useful for NMR spectroscopy.

Experimentally, pK < sub > a </ sub > values can be determined by potentiometric ( pH ) titration, but for values of pK < sub > a </ sub > less than about 2 or more than about 11, spectrophotometric or NMR measurements may be required due to practical difficulties with pH measurements.

* Tetramethylsilane, a chemical compound commonly used as a chemical shift standard in < sup > 1 </ sup > H and < sup > 13 </ sup > C NMR spectroscopy

Quite recently, the aromaticity of planar Si < sub > 5 </ sub >< sup > 6 -</ sup > rings occurring in the Zintl phase Li < sub > 12 </ sub > Si < sub > 7 </ sub > was experimentally evidenced by Li solid state NMR.

Evidence from < sup > 17 </ sup > O NMR spectroscopic data suggests that protonation of the sulfite ion gives a mixture of isomers:

Different organolithium aggregation states are encountered in the simple deprotonation of the terminal alkyne ( phenylthio ) acetylene by n-butyllithium in THF at-135 ° C, a process that can be followed by < sup > 7 </ sup > Li NMR spectroscopy:

The < sup > 13 </ sup > C polarization levels in solid compounds can reach up to ≈ 64 % and the losses during dissolution and transfer of the sample for NMR measurements can be minimized to a few percent .< ref > Compounds containing NMR-sensitive nuclei can also be hyperpolarized using chemical reactions with para-hydrogen.

: 42. 6 MHz of the < sup > 1 </ sup > H nucleus frequency, in NMR.

For example in proton NMR the electron-poor tropylium ion has its protons downfield at 9. 17 ppm, those of the electron-rich cyclooctatetraenyl anion move upfield to 6. 75 ppm and its dianion even more upfield to 5. 56 ppm.

" Multinuclear Solid-State NMR of Inorganic Materials ", Pergamon Materials Series Volume 6, Elsevier, Oxford 2002.

In 1984, Nicholson showed < sup > 1 </ sup > H NMR spectroscopy could potentially be used to diagnose and treat diabetes mellitus, and later pioneered the application of pattern recognition methods to NMR spectroscopic data.

< sup > 1 </ sup > H and < sup > 13 </ sup > C aren't the only nuclei susceptible to NMR experiments.

A number of different nuclei can also be detected, although the use of such techniques is generally rare due to small relative sensitivities in NMR experiments ( compared to < sup > 1 </ sup > H ) of the nuclei in question, the other factor for rare use being their slender representation in nature / organic compounds.

* Schmidt-Rohr, K. and Spiess, H .- W., Multidimensional Solid-State NMR and Polymers, Academic Press, San Diego, 1994.

If NMR lineshapes are not relaxation-limited ( as is commonly the case in solid-state NMR ), then the NMR signal will generally decay much more quickly e. g. microseconds for < sup > 1 </ sup > H NMR.

An association constant ( Ka ) of 8600 M < sup >− 1 </ sup > between the host buckycatcher and a C60 fullerene was calculated using < sup > 1 </ sup > H NMR spectroscopy.

In 2010-2011 it recorded 4. 3 million unique online user sessions and over 110, 000 people visited NMR exhibitions held around the country in 2009 / 10.

Antiaromaticity is evident from NMR spectroscopy with the inner NH protons shifting downfield by 10 ppm to 21 ppm.

In carbon NMR the chemical shift of the carbon nuclei increase in the same order from around – 10 ppm to 70 ppm.