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IR SPECTROSCOPY, MEENAZ BAKSH 19PH12 - Coggle Diagram
IR SPECTROSCOPY
Instrumentation
Source of radiation
Nernst Glower
Globar
Nichrome wire
Rhodium Wire
Tungsten Filament Lamp
Monochromator
Prism monochromator
Grating monochromator
Sample cell handling
Solid dissolved in solvent
As solid film
Mull technique
Pressed pellet technique
Sampling of liquid
Samoling of gases
Detector
Golay cell
Bolometer
Thermocouple
Thermister
Pyroelectric detector
Principle
Vibrational frequence(v)
Selection rule:-
Absorption of correct wavelength of radiation
Dipole moment
Overtones
Application
Qualitative analysis
Indentification of organic compound
Structure determination
Distinction between two type of hydrogen bonding
Quantitative analysis
Study of chemical reaction
Study of keto enol tautomerism
Introduction
Infrared region:-
beyond red
( 12800 - 10cm‐¹)
Far infrared (400 - 10cm‐¹)
Mid infrared ( 400 - 400cm‐¹)
Near infrared ( 14000-400cm‐¹)
Theory
Fundamental modes of
vibrations in
polyatomic molecules
Stretching Vibrations
Symmetric stretching vibration
Asymmetric stretching vibration
Bending Vibrations
Scissoring
Rocking
Wagging
Twisting
Translational energy
Rotational frequencies
Vibrational energy
Factors affecting vibration :
Coupled interaction
Hydrogen bonding
Fermi resonance
Electronic effect
MEENAZ BAKSH
19PH12