2D – NMR | Nuclear Magnetic Resonance Spectroscopy | BSc & MSc |

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  • 2D NMR spectroscopy referred to both frequency axes.
  • It is actually a 3D plot.
  • It requires two Fourier transformations at right angle to each other – two independent time axes to arrive at two orthogonal frequency axes.
  • In this, multiple pulse sequence are considered:-
    • Equilibrated period is followed by two pulses with an intervening time interval.
    • Final pulse being the π / 2 acquisition pulse.
    • Evolution period between the pulses.
  • Sequential FT transformation of these FIDS yields a set of spectra which peak intensities varies sinusodally.
  • If evolution time interval over many different  experiments is varied and collected the resulting FIDS into one overall experiment.
  • The first series of FTS – results – second frequency axis  – derived from acquisition time of FID.
  • The second series are FTS results in the first frequency axis – function of evolution of time.

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