CH 10: IR spectroscopy

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10 Terms

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Infrared (IR) measures…

bond vibration frequencies in a molecule and is used to determine the presence or absence of a func. group

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IR region is measured in

wave number ( 1/cm or cm^-1)

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When bonds in molecules ______ or ____, they will absorb a certain freq. of light in the IR region.

stretch or bend

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the freq. of light absorbed depends on…

atomic mass of bonded atoms and the bond E

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Freq. decreased with…

increasing atomic weight

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freq. increases when…

bond E increases

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Degree of unsaturation equation (DoU)

2C + 2 - H - X + N/(2)

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1 DoU

1 pi bond or 1 ring

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2 DoU

2 pi bonds, 2 rings, or 1 pi bond and 1 ring

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Proposed structures cannot have the following:

1) allenes ( C=C=C )

2) DoU equal or greater than 4. Then, your cmp contains a benzene ring.

3) No structure w rings of less than 5 atoms or more than 6 atoms.