What is it meant by characteristic IR?

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    Characteristic Ir
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Discussion Overview

The discussion revolves around the concept of "characteristic IR" in the context of infrared spectroscopy, particularly focusing on what it means when a compound is said to lack characteristic IR features. The scope includes theoretical understanding and application in analytical chemistry.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • Some participants suggest that "characteristic IR" refers to unique features in the IR spectrum that are indicative of specific functional groups.
  • Others question the implications of a compound lacking characteristic IR, proposing that it may indicate the absence of unique absorption bands that signify functional groups.
  • A later reply elaborates that in the context of an analyte, the absence of characteristic IR bands suggests no unique absorption indicative of functional groups, while in the context of an IR solvent, it may mean no interfering absorption bands are present.

Areas of Agreement / Disagreement

Participants express differing interpretations of what it means for a compound to lack characteristic IR features, indicating that multiple competing views remain on the topic.

Contextual Notes

The discussion does not resolve the specific definitions or implications of "characteristic IR," and assumptions about the context of use (analyte vs. solvent) are not fully explored.

Chemist20
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Any ideas? Thanks so much!
 
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It means that the IR spectrum is so unique that it is characteristic of ...
 
Yes but IF I'm just told that a certain organic compound doesn't have any characteristic IR what does that mean?.
 
This probably means that there isn't an IR absorption band unique to the molecule indicative of a functional group with "characteristic" IR bands in the spectrum. This is in the role as the analyte.
In the role of an IR solvent it would indicate no absorption bands exist that interfere with its use to see the desired characteristic IR bands for ID'ing compounds dissolved in it.
 

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