What do the symbols \delta and \upsilon represent in IR spectroscopy?

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SUMMARY

The symbols \delta (delta) and \upsilon (nu) in infrared (IR) spectroscopy represent different types of molecular vibrations. Specifically, \delta indicates bending vibrations, while \upsilon refers to stretching vibrations of functional groups. The discussion highlights the confusion surrounding the interpretation of these symbols in relation to the fingerprint region (400-1500 cm-1) and the functional region (1500-4000 cm-1). It is established that the fingerprint region is less useful for identifying functional groups compared to the functional region.

PREREQUISITES
  • Understanding of IR spectroscopy principles
  • Familiarity with molecular vibrations (stretching and bending)
  • Knowledge of spectral regions (fingerprint and functional regions)
  • Basic interpretation of IR spectra
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  • Research the differences between stretching and bending vibrations in IR spectroscopy
  • Study the significance of the fingerprint region in IR spectra analysis
  • Learn how to identify functional groups using IR spectroscopy
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burton95
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Hi there. First time PF poster. I have a question about interpreting IR spectro graphs. I get the general idea of interpreting the sharpness and strength of the line but when I need to ID the pulse down I have to choose between \delta and \upsilon (or mabe its just v) version of the functional groups. I tried to correlate the usage b/w the fingerprint (400-1500 cm-1) and the functional (1500-4000 cm-1) regions and haven't seen the light yet. Thanks

burton95
 
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I don't understand what you mean by delta or nu versions of the functional group. The fingerprint region is pretty useless in finding out what functional groups are present btw. Could you state your question more precisely?
 
I think I found out it represents a stretch or a bend. Thanks for the reply

Anthony
 

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