By Alexej Jerschow (auth.), Dr. Norbert Müller, Dr. Perunthiruthy K. Madhu (eds.)

Why to use solid-state NMR? - via now, we must always have realized that NMR is principally used for the research of molecules in resolution, whereas x-ray diffraction is the strategy of selection for solids. in accordance with this truth, the 2 contemporary 'NMR-Nobelprizes' went certainly into the liquid part: my very own one 11 years in the past, and especially the newest one to Kurt Wuthrich. His prize is past any doubts rather well justified. His contribution in the direction of the research of biomolecules in answer, of their local (or virtually local) atmosphere is really huge. all of us will cash in on it in some way whilst one in all our destiny illnesses might be cured with larger medications, in response to the insightful wisdom won via liquid-state NMR. fields of NMR are nonetheless ignored of the Nobel Prize video game: magnetic reso­ nance imaging (MRI) and solid-state NMR. The disrespect for MRI in Stockholm is especially obscure; yet this isn't an issue to be mentioned at present position. Solid-state NMR is the 3rd of the 3 nice fields of NMR, robust already this day and intensely promising for the close to future.

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Madhu 25Mg NMR as a tool for elucidating magnesium coordination environments in biological complexes. Conclusions In this review an outline of the MQMAS experiment together with the basic theory for MAS and MQMAS of half-integer quadrupolar nuclei was given.

Figure 2 illustrates this aspect for a spin-~ nucleus. Theoretical second-order quadrupolar broadened line shapes are given in Fig. 3 for both static and MAS cases for a few values of 7]. Although MAS achieves considerable line narrowing of the central transition (3 to 4 times with respect to the line width in a static case) it is still beyond what can be called a high-resolution quadrupolar spectrum. The reason why MAS cannot narrow the second-order broadening can be seen directly from Eq. (9).

Solid State NMR Spectroscopy 33 Experimental Aspects Optimisation of MQMAS pulse sequence starts with a proper calibration of the rf power, so that selective pulses (selective 90° and 180°) could be employed accurately for z-filter or shifted echo experiments. This is done with a reference sample, usually a solution, where l/Q is averaged to zero. The MQMAS excitation and conversion pulses are then adjusted by monitoring the MQ echo intensity in a one-dimensional (ID) experiment, employing a very small delay, between the excitation and conversion pulses, of say, 5 ~s.

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