Spectroscopy

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  • Created by: mohz
  • Created on: 07-01-14 10:48
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  • Spectroscopy
    • Mass Spec
      • Fragmentation
        • M+1 peak
          • no. of carbon atoms = (height of M+1 peak/height of M peak) x 100
          • peak 1 unit to  ->  of M peak
          • *caused by*
            • 13C Isoptope
        • M+2 peak
          • *caused by*
            • natural isoptopes of different masses  of Cl and Br
          • peak 2 units to ->  of M peak
          • M and M+2 peak heights
            • 3:1 ratio because of 35Cl and 37Cl isoptopes
            • 1:1 ratio because of 79Br and 81Br isoptopes (equal abundance = same height)
    • NMR
      • Position of 13C or 1H atoms in a molecule
      • Chemical Shift
        • *depends on*
          • Molecular environment
        • Standard Substance (TMS)
          • Calibration purposes
          • Inert (doesn't react with the sample)
          • Non-toxic
          • Volatile (easy to remove from sample)
      • Spectrum
        • 1H
          • Obtained using samples dissolved in proton-free  solvents
            • e.g. deuterated solvents such as CDCl3 and CCl4
              • *excpetions*
                • e.g. CHCl3 contains 2H not 1H
        • 13C
  • 13C

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