Less Crucial, But Still Useful: Two More Very Diagnostic Areas.Specific Examples of IR Spectra of Carbonyl Functional Groups.Alcohols and Carboxylic Acids: More Detail.The Two Main Things To Look For In An IR Spectrum: “Tongues” and “Swords”.Starting With “Hunt And Peck” Is Not The Way To Go.Let’s Correct Some Common Misconceptions About IR.Your first impression of looking at that IR might be: agh! how am I supposed to make sense of that? We saw that the IR spectrum of water was pretty simple – but moving on to a relatively complex molecule like glucose (below) we were suddenly confronted with a forest of peaks! The result is a technique known as Infrared Spectroscopy, which is a useful and quick tool for identifying the bonds present in a given molecule. We can observe and measure this “singing” of bonds by applying IR radiation to a sample and measuring the frequencies at which the radiation is absorbed. These vibrations have frequencies that are in the mid-infrared (IR) region of the electromagnetic spectrum. Last post, we briefly introduced the concept of bond vibrations, and we saw that we can think of covalent bonds as a bit like balls and springs: the springs vibrate, and each one “sings” at a characteristic frequency, which depends on the strength of the bond and on the masses of the atoms. How To Interpret IR Spectra In 1 Minute Or Less: The 2 Most Important Things To Look For
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