IR Spectrum and Mass Spectrometry

Frequency: 3600-3200 (s,b)

Bond Type: O-H stretch, H-bonded

Functional Group: alcohols, phenols

Frequency: 3100-3000 (m)

Bond Type: =C-H stretch

Functional Group: alkenes

Frequency: 3000-2850 (m)

Bond Type: C-H stretch

Functional Group: alkanes

Frequency: 1760-1665 (s)

Bond Type: C=O stretch

Functional Group:carbonyls (general)

Frequency: 1680-1640 (m)

Bond Type: - C = C - stretch

Functional Group: alkenes

Frequency: 1320-1000 (s)

Bond Type: C-O stretch

Functional Group: alcohols, carbox. acids, esters, esthers

When analyzing an IR spectrum, what is the first step? If yes, what do you look for next?

If the answer to the first step of analyzing an IR spectrum is no, What do you do next?

What are some additional features to look for when analyzing IR Spectra?

An m/z (amu) of 15 indicates what?

⁺CH₃ methyl cation

An m/z (amu) of 29 indicates what?

⁺CH₂CH₃ ethyl cation

An m/z (amu) of 43 indicates what?

⁺CH₂CH₂CH₃ propyl cation or :O=⁺C-CH₃ an acylium ion

An m/z (amu) of 57 indicates what?

⁺CH₂CH₂CH₂CH₃ butyl cation

An m/z (amu) of 77 indicates what?

Phenyl Cation

An m/z (amu) of 91 indicates what?

Benzyl Cation