IR Spectroscopy: Functional Group Identification Guide - Prof. Fishal, Exams of Chemistry

A concise reference for interpreting infrared (ir) spectroscopy data, specifically focusing on the characteristic absorption frequencies of various chemical bonds and functional groups. It lists the expected wavenumber ranges (cm-1) for common bonds such as c-h (sp3, sp2, sp), c-c (alkene, alkyne), c-o (carbonyl), o-h (alcohol), n-h (amine), c-n (nitrile), and n-o (nitro). Additionally, it includes specific ir absorption values for carboxylic acids, ketones, aldehydes, and esters, aiding in the identification of these functional groups in unknown compounds. This information is crucial for students and professionals in organic chemistry for structure elucidation and compound identification using ir spectroscopy. The document serves as a quick reference guide for spectral analysis, enhancing understanding and application of ir techniques in chemical analysis.

Typology: Exams

2024/2025

Available from 07/16/2025

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IR
SPECTROSCOPY
PRACTICE #14
1. C-H sp3
2800-3000
cm-1
2. C-H sp2
3000-3100
cm-1
3. C-H sp
3300
cm-1
4.
C-C Alkene
1620-1680
cm-1
5.
C-C Alkyne
2100-2260
cm-1
6. C-O Carbonyl
1670-1820
cm-1
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  1. O-H Alcohol 3200- 3600
  2. N-H Amine 3300- 3500
  3. C-N Nitrile 2210- 2260
  4. N-O Nitro 1515-1560, 1345- 1385
  5. Carboxylic Acid IR 3300-2500cm (for OH) and carbonyl stratch at 1700cm
  1. Aldehyde IR 1720-1740 (for carbonyl) and 2720-2850 for C-H
  2. (1) C-H (Alkane)
  3. (1) =C-H (2) C-H (Alkene)
  4. (1) triple bond C-H (2) C-H (3) Carbon triple bond C (Alkyne)
  5. (1) O-H (2) C-H (3) C-O (alcohol)

18. (1) C-H

(2) C=O (ketone)