Coupling constant

Coupling constant
INTRODUCTION
TYPES
Geminal Coupling
Vicinal Coupling
Long Range Coupling
APPLICATION OF NMR SPECTROSCOPY

1. COUPLING CONSTANT Guided By Dr. V. Sridharan   Associate Professor (H.O.D.) Prepared By Shakti Ranjan Samal Roll No:-2441616 Department Of Chemistry And Chemical Sciences Central University Of Jammu, j&k

2. CONTENT INTRODUCTION TYPES Geminal Coupling Vicinal Coupling Long Range Coupling APPLICATION OF NMR SPECTROSCOPY

3. INTRODUCTION The distance between the peaks in given multiplet is a measure of splitting effect known as coupling constant It is denoted by symbol J and expressed in Hz. Coupling constant are a measure of the effective ness of spin–spin coupling and very useful in 1 H NMR of complex structures.

4. J = Difference of chemical shift value in ppm 1 ppm = 60 Hz 1 ppm = 300 Hz

5. TYPES There are three type of coupling constant Geminal Coupling Vicinal Coupling Long Range Coupling

6. GEMINAL COUPLING

7. VICINAL COUPLING

8. Karplus Diagram Karplus equation: J= 8.5cos 2 - 0.28(0-90 ) J = 9.5cos 2 - 0.28(90 -180 )

9. Problems

10. LONG RANGE COUPLING

11. Range Of The Coupling Constant

12. APPLICATION OF NMR SPECTROSCOPY