CH 2536 Lecture 02 IR 12.7 - 12.15

CH 2536 Lecture 02 IR 12.7 - 12.15 - Lecture 2 Infrared...

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1 Lecture 2 Infrared spectroscopy Sections 12.7- 12.15
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2 What is the point of it? A basic problem in organic chemistry is “what is the structure of this compound?” In the early days of organic chemistry the only way to answer this question was by doing chemical reactions on an unknown compound to break it down into smaller pieces, and then to try to deduce the structure from the pieces. This process was slow and tedious; it took over 50 years to work out the structure of morphine, for example.
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3 What is the point of it? For the last 50 years or so this question has been answered with the help of spectroscopic methods . There are several of these, but we will discuss only three in this course: Infrared spectroscopy Mass spectrometry NMR spectroscopy Each of these methods gives different information about a compound
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4 What does each method tell you? Infrared spectroscopy Gives information about functional groups Mass spectrometry Gives information by breaking the molecule into smaller pieces at easily broken bonds and “weighing” them Nuclear magnetic resonance (NMR) spectroscopy Gives information on the types of hydrogen and carbon and how they are connected
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5 How does infrared spectroscopy work? Visible light represents only one small part of the possible electromagnetic radiation
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6 How does infrared spectroscopy work? Visible light represents only one small part
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CH 2536 Lecture 02 IR 12.7 - 12.15 - Lecture 2 Infrared...

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