Analysis: Combined techniques

Made using OCR Chemistry textbook. Pages 100- 101. Richie and Gent.

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  • Created on: 21-12-12 19:13
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  • Combined techniques
    • Mass spectroscopy
      • Gives relative molecular mass of a compound.
        • Use in conjunction with empirical formula to calculate molecular formula
      • Fragmentation patterns give clues about the carbon skeleton in the  molecules of a compound.
        • Could apply to more than one  compound with same Mr.
    • Infrared spectroscopy
      • Gives information about the bonds present in a molecule and likely functional groups present
        • Different members of the same homologous series = same functional groups
      • Fingerprint region
    • NMR spectroscopy
      • Carbon-13
        • Number of C environments
        • Type of C environment
          • Range 0-220ppm
      • Proton
        • Types of H environment
          • Range 0-12ppm
        • Number of types of H
        • Relative no. of protons in each envrionment
        • No. of  protons on adjacent C
    • Often a single technique is inconclusive and a combo of techniques is used in practice


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