NMR spectroscopy

Introduction
                        We know electron rotated around nucleas and own axis
When electron rotated axis then generated spin quantum number angular momentum
When rotated around them some nucleas are rotated own axis then generated spin quantum number
A nuclear spin quantum number of a nuclei on proton and neutron /nucleas present in the nucleas
Concept of NMR
                              There for it is evidence that those nuclei which have zero spin quantum number Those nuclei which do not spin can not observed by NMR spectroscopy Example c6 ,o8
Where as those nuclei which spin quantum number is half integral show
Observed signal in NMR spectroscopy Example c13 H1,p31 etc
If proton is in allingment it the external magnetic field then it may observed energy and it can back two lower energy level by the relishing same energy
These transfer of proton form one energy level to their energy levels is called flipping
The energy necessary for this is E=hv
Which is there form the radio frequency region
Defferenc of energy between two energy level depend on applied magnetic field

This frequency of the radio frequency region if we use proton for spectroscopy then it is known as proton NMR.
1.Number of signal
2. Position of signal
3. In density of signal
4. Splitting of signal
1.Number of signal in proton NMR spectroscopy 
                       (a) chemical equelent proton
                                                                         The proton in chemical environment is known as chemically equelentproton
The total number of signal in proton NMR represent the total sat of chemical equelent proton

2.Position of signal =
                                       The position of signal from reference peak is called chemical signal 
In NMR of hydrogen TMS (tetra methyl silane) is use as reference 

            
It TMS we use are reference due the
1. It is chemicaly inert /inactive compound 
2. It is can be easily removed for organic from sample
It as 12 proton which are highly shielded as compared to other proton of organic compounds