Double resonance in heteronuclear two-dimensional spectroscopy
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New NMR techniques are described for transferring transverse magnetization between scalar-coupled nuclei in the rotating frame. The methods involve simultaneous spin-locking of two selected spins A and X, using cosinusoidal modulation of the radio frequenc ...
Dipolar-coupled spectra of mols. dissolved in liq. cryst. solvents were analyzed by applying pattern recognition procedures to 2-dimensional z-filtered correlation spectra (z-COSY). Transitions that share common common energy levels can be recognized as su ...
An anal. was made of the effects of nonexponential transverse relaxation during the free precession periods of 2-dimensional NMR expts. The presence of cross-correlation between various interactions that cause relaxation, such as chem. shift anisotropy and ...
In order to sep. overlapping diagonal multiplets in two- or three-dimensional NMR spectra, new sequences using selective pulses are described which allow one to "inject" magnetization at the beginning of the evolution period by transfer from a selected cou ...
Computer-supported anal. of two-dimensional correlation spectra encounters a no. of obstacles which are due, in the simplest case, to insufficient digital resoln., and, in more severe cases, to fundamental ambiguities in multiplet patterns. Various strateg ...
In high-resoln. NMR, a network of scalar-coupled spins can be broken down into fragments which encode information about the chem. shifts and couplings that are relevant to a cross-peak multiplet in a two-dimensional correlation ("COSY") expt. Novel selec ...
Procedures are described for automated anal. of two-dimensional NMR spectra correlating the chem. shifts of carbon-13 with the shifts of neighbor protons that are directly attached to the carbon-13 nuclei and with remote protons that have scalar couplings ...
In applications to systems with resolved scalar couplings, the 2-dimensional exchange expt. (NOESY: nuclear Overhauser effect spectroscopy) can provide greatly increased information if the flip angles of the 2 pulses that precede and follow the mixing inte ...
Cross-correlation between proton chem. shift anisotropy and proton-proton dipolar interactions is shown to be an important relaxation mechanism. Cross-correlation leads to a partial conversion of Zeeman order into longitudinal two-spin order. The build-up ...
