Definition : Infrared spectroscopy is the measurement of wavelength and the absorption of light by sample. It also deals with infrared region of electromagnetic spectrum such as the light which have longer long wavelength and a lower frequency than visible light All major functional groups absorb at their characteristics wavenumbers. From the data available due to absorption frequencies, the probable structure can be predicted. If some chemical data is available, it leads to the confirmation of the structure. Parts of Infrared region: The Infrared region divided into three parts which are given below; • Near Infrared: This region includes from 75um to 2.5um having wave numbers ranges from 12500-4000cm-1. In this region, usually the absorption bands due to overtones of hydrogen stretching vibrations. • Middle or Fundamental infrared: This region lies from 2.5 to 16um having wavenumber 4000-625cm-1. Rotations and molecular vibrations take place in it region. • Far Infrared This reg...
Comments
Post a Comment