Solid-state proton NMR of paramagnetic metal complexes: DANTE spin echoes for selective excitation in inhomogeneously broadened lines
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In my thesis I shall focus on the development of new NMR experimental methods to study structure and internal motions of two kinds of biological polymers, viz. proteins and nucleic acids. I shall investigate the anisotropic local motions of peptide planes ...
The envelopes of spin-echo amplitudes obtained with trains of multiple refocusing pulses are normally modulated by homonuclear scalar couplings. Echo modulations make it difficult to determine transverse relaxation rate constants R2. Provided that the puls ...
Chirp pulses were used to excite transverse magnetization over bandwidths that are .apprx.50 times wider than the amplitude of the RF field. Exptl. profiles are shown of the amplitudes and phases as a function of offset. The efficiency of refocusing by chi ...
A spectrometer allowing the measurement of signals with spin-spin relaxation times as short as 0.5 μs has been developed. It consists of a transmitter based on a commercial spectrometer and a homemade receiver. The acquired signals are imported in the soft ...
The mobility of 15N labeled proteins can be characterized by measuring the cross-correlation rates dN,NI that govern the conversion of Zeeman order Nz of an amide 15N nucleus into longitudinal two-spin order 2NzIz involving the amide 15N and 1H nuclei. Thi ...
NMR spectroscopy is one of the newer spectroscopic techniques for investigating the static, dynamic and electronic structures of molecules adsorbed onto metal catalyst surfaces. We review recent progress in the application of solid-state NMR methods to the ...
Since many biological processes occur on the μs to ms time scale, internal dynamics on that time scale may well be related to biological functionality. The characterization of internal dynamics is thus an important issue to improve our understanding of the ...
On page 2543, the bipolar scheme uses two gradient pulses for encoding, and two other gradient pulses for decoding. Thus, Equation 1 should be S/S0 = exp{-D4k2(D + 6t)}, rather than S/S0 = exp{-Dk2(D + 6t)}, as published. The incorrect expression would lea ...
Using a refocused INADEQUATE NMR experiment we show that homonuclear carbon-carbon through-bond correlations can be obtained in disordered organic solids where the line widths greatly exceed the value of the scalar coupling. The feasibility of the experime ...
It is shown how transverse magnetization can be excited with a single low-power radiofrequency pulse consisting of a superposition of 2 frequency-modulated components. The phase dispersion obtained with this self-refocusing pulse is very small over bandwid ...