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.
- Gives relative molecular mass of a compound.
- 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
- Gives information about the bonds present in a molecule and likely functional groups present
- 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
- Types of H environment
- Carbon-13
- Often a single technique is inconclusive and a combo of techniques is used in practice
- Mass spectroscopy
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