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UV Visible spectroscopy, FARJINA FIROZ AKHTAR
19PH01 - Coggle Diagram
Spectroscopy:-The branch of science concerned with the investigation and
measurement of spectra produced when matter (Atoms or Molecules)
interacts with electromagnetic radiation (EMR).
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When a molecule absorbs UV radiation of frequency ν sec–1
, the electron in that molecule
undergoes transition from a lower to a higher energy level or molecular orbital
Ultraviolet and visible spectroscopy deals with the recording of the absorption of
radiations in the UV and visible regions of the electromagnetic spectrum.
responsible for imparting colour to
the compound. Nitro -compounds are generally yellow in colour. Clearly, nitro group is
the chromophore that imparts yellow colour
Auxochrome
any group which does not itself acts as a
chromophore but whose presence shift s of the absorption band towards the red end
of the s pectrum
-OH, -NH3
Spectral shift
Hyperchromic
intensity of absorption maximum
increases,
Hypochromic
the intensity of absorption maxim um
decreases,
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