analytical techniques
- Created by: Margaret Hobart
- Created on: 15-05-21 14:51
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- analytical techniques
- mass spectrometry
- used to find Mr of a compound
- molecular ion formed when a molecule loses an e-
- Mass/charge value of the molecular ion peak is equal to the molecular mass of the compound
- high resolution mass spectrometry
- used for identifying compounds that appear to have the same Mr when they're rounded to the nearest whole number
- infrared spectrometry
- bonds in a molecule absorb infrared radiation at characteristic wave numbers
- unique
- 'fingerprinting' allows identification of a molecule by comparison of spectra
- 1. the IR radiation is absorbed by the covalent bonds, increasing vibrational energy
- 2. bonds between different atoms absorb different IR frequency
- bonds in different places also absorb different frequencies
- 2. bonds between different atoms absorb different IR frequency
- limitations: doesn't tell us the amount of different elements
- bonds in a molecule absorb infrared radiation at characteristic wave numbers
- mass spectrometry
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