Chapter 12 - Wade(1)

Chapter 12 - Wade(1) - Introduction to General and Organic...

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H O H Chapter 12 Infrared Spectroscopy Dr. David P. Brown St. John’s University Introduction to General and Organic Chemistry III _____________________________
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Chapter 12 2 H O H Introduction Spectroscopy is an analytical technique which helps determine structure. It destroys little or no sample. In Infrared Spectroscopy, the amount of light absorbed by the sample is measured as wavelength is varied. =>
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Chapter 12 3 H O H Types of Spectroscopy Infrared (IR) spectroscopy measures the bond vibration frequencies in a molecule and is used to determine the functional group . Mass spectrometry (MS) fragments the molecule and measures the masses. Nuclear magnetic resonance (NMR) spectroscopy detects signals from hydrogen atoms and can be used to distinguish isomers. Ultraviolet (UV) spectroscopy uses electron transitions to determine bonding patterns. =>
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Chapter 12 4 H O H Electromagnetic Radiation Examples : X rays, microwaves, radio waves, visible light, IR, and UV. Frequency,
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Chapter 12 - Wade(1) - Introduction to General and Organic...

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