FTIR vibrations

  • #1
why on ftir graph there are several peaks for the same compound but at different wavelengths?
what causes the different modes of vibration for the same compound (PO4), what causes the v1 ,v3,v4 for PO4... help me please:frown:
upload_2017-4-14_12-59-58.png
 

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  • #2
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An IR spectrum is a molecule's fingerprint. Every unique compound will have its own IR spectrum. The various peaks depend on the individual bonds in the molecule. Then subdivide the number of unique bonds into stretching modes, symmetric stretching, asymmetric stretching, rocking, wagging, etc. Even simple molecules can have busy IR spectra.
 

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