1. 1D and 2D NMR techniques are described. 1D NMR involves applying a 90 degree pulse to a sample in a magnetic field and measuring the resulting signal. 2D NMR applies two 90 degree pulses separated by a short delay and measures two signals, which are Fourier transformed to provide frequency information in two dimensions. 2. 2D NMR was first proposed by Jean Jeener and provides more structural information than 1D NMR as it plots data on two frequency axes rather than one. It involves collecting a series of 1D NMR spectra with varying pulse delays and further Fourier transforming these signals. 3. The document provides details on the principles, pulse sequences, and names of 1D and 2D NMR techniques.

1. 1D AND 2D NMR
Prepared By
MAHENDRA G S
Pharmaceutical Chemistry
JSSCP,Mysuru.

2. OBJECTIVES
1-D NMR
1. Principle
2. Sequence Scheme
3. Name Proposed
2-D NMR
1.Principle
2.Sequence Scheme
3.Name proposed
4.Why 2D NMR Types

3. 1-D NMR
1. Simple FT-NMR Technique
2. 1-D NMR spectroscopy is simple technique In which we provide 90 degree pulse to sample
which is placed in uniform magnetic field. As a result we get a FID signal (raw form). To get
meaningful data we apply Fourier Transform program on FID to get desire signal.
3. Data in form of frequency vs intensity is plotted along x-axis and y-axis respectively

4. Sequence Scheme
If we divide the 1-D NMR into a general periods , we get two steps
•Preparation: (do something with nuclei)
1.What we can do ???
•Simply we provide a 90 degree pulse
2.Detection: ( detect the signal)
.Simply we measure the signal

5. Why Named 1-D NMR ??
• We call it 1-D NMR , not because of graph. Graph is actually in 2-d.
• Since one of the time domain is changing into frequency dimension
Thats why we call it 1D NMR .

7. • The first two-dimensional experiment was proposed by
Jean Jenner
. • 2D NMR is a set of nuclear magnetic resonance
spectroscopy (NMR) methods which give data plotted in a
space defined by two frequency axes rather than one.
• 2D NMR spectra provide more information about a
molecule than one-dimensional NMR spectra
2-D NMR

8. Principle :
 2D NMR is Nuclear magnetic resonance spectroscopy in which we
provide a 90 degree pulse to our sample which is placed in uniform
magnetic field then we wait for (0ms-5ms) depending upon the experiment
type then again we provide again 90 degree pulse and this time we measure
signal as FID.
 As a result we get Two FID signals which are plotted with respect to time
domain.
To get a meaningful data , we apply Fourier transform program on FIDs to
get frequency in terms of ppm.

9. • Primary 2D matrix consists a series of FIDs
• A set of 1D NMR spectra is obtained by Fourier transformation with respect
to t2.
• The signals of each transformation may differ in amplitude and phase. A
second Fourier transformation with respect to t1 yields the final 2D matrix
with frequency axes F1 and F2

17. REFERENCES
INSTRUMETAL ANALYSIS- CHATWAL
ORGANIC SPECTROSCOPY-WILLAM KEMP

18. THANK YOU