ORGANIC SPECTROSCOPY
Study of the interaction of light with matter
The electromagnetic radiations are classified on the basis of their
wavelength(or Energy)into different categories.
Cosmic and Ultra- Visible Infra-Red Microwave Radio
Gamma Rays Violet Near Far
A0 10-4 4000 107 1014
1000 2000 8000 104
Molecular Molecular Nuclear Spin
Nuclear Electronic Rotational
Vibrational Transitions
Transition Transitions Transitions
Transitions
Energy cal/mole
1014 – 1010 100 – 35 K ~28.5 K 10 -2 – 10-6
, I.R. 4000-667 cm-1
I.R.Spectroscopy Detection of functional
groups
Fuctional group region = 4000-1300 cm-1
•-OH,-CH,-NH,-SH = 2500-3700 cm-1
•Carbonyl group region = 1680 cm-1 – 1850 cm-1
•Triple bond region C-C triple
bond,C-N triple bond = 2100-2500 cm-1
, Molecular Vibrations
Applications of IR in and IR Spectroscopy
organic spectroscopy
1. Determination of Functional groups.
2. Study of progress of reaction
3. Detection of Hydrogen bonding
4. Determination of size of ring
ketones
IR SPECTRUM
Study of the interaction of light with matter
The electromagnetic radiations are classified on the basis of their
wavelength(or Energy)into different categories.
Cosmic and Ultra- Visible Infra-Red Microwave Radio
Gamma Rays Violet Near Far
A0 10-4 4000 107 1014
1000 2000 8000 104
Molecular Molecular Nuclear Spin
Nuclear Electronic Rotational
Vibrational Transitions
Transition Transitions Transitions
Transitions
Energy cal/mole
1014 – 1010 100 – 35 K ~28.5 K 10 -2 – 10-6
, I.R. 4000-667 cm-1
I.R.Spectroscopy Detection of functional
groups
Fuctional group region = 4000-1300 cm-1
•-OH,-CH,-NH,-SH = 2500-3700 cm-1
•Carbonyl group region = 1680 cm-1 – 1850 cm-1
•Triple bond region C-C triple
bond,C-N triple bond = 2100-2500 cm-1
, Molecular Vibrations
Applications of IR in and IR Spectroscopy
organic spectroscopy
1. Determination of Functional groups.
2. Study of progress of reaction
3. Detection of Hydrogen bonding
4. Determination of size of ring
ketones
IR SPECTRUM
