GPAT Online Course

UV-Visible Spectroscopy

UV Spectroscopy (Part 1)
  • Electromagnetic spectrum
  • Wavelength, frequency, wavenumber
  • UV-visible spectroscopy
  • Where do excited electrons go?
  • What are Molecular Orbitals?
  • Beer Lambert’s Law
  • Relation between Absorbance and Transmittance

 

UV Spectroscopy (Part 2)
  • Concept of HOMO and LUMO
  • Electronic transitions: relative energies
  • UV-spectroscopy Instrumentation
  • Light source: 1. UV 2. Visible
  • Monochromator: 1. Filter 2. Prism 3. Grating
  • Detectors: 1. Barrier layer cell 2. Phototube 3. Photomultiplier

 

UV Spectroscopy (Part 3)
  • Specific absorbance vs molar absorptivity
  • Double beam spectrophotometer
  • What is λmax
  • Factors affecting λmax: 1. Solvent 2. Auxochrome 3. Conjugation
  • What is Chromophore and Auxochrome?
  • Absorptive shifts
  • HOMO-LUMO gap in ethylene vs butadiene

 

UV Spectroscopy (Part 4): Woodward-Fieser Rules
  • S-cis vs S-trans conformations of butadiene
  • Homoannular vs Heteroannular dienes
  • Woodward-Fieser rules for Dienes: Practice examples
  • What is double bond extending conjugation?
  • What is exocyclic double bond?
  • What is ring residue?
  • Woodward-Fieser rules for Enones: Practice examples

 

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Reference Notes

 

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