Fingerprint of Molecule Whole-molecule vibrations and bending vibrations are also quantitized No two molecules will give exactly the same IR spectrum(except enantiomers Simple stretching: 1600-3500 cm Complex vibrations: 600-1400 cm-1 called the fingerprint region Chapter 12Chapter 12 10 Fingerprint of Molecule • Whole-molecule vibrations and bending vibrations are also quantitized. • No two molecules will give exactly the same IR spectrum (except enantiomers). • Simple stretching: 1600-3500 cm-1 . • Complex vibrations: 600-1400 cm-1 , called the “fingerprint region.” =>