Table of IR Spectroscopy Values
Core concepts.
This article will provide a table containing the IR spectrum frequency values and the molecules they represent.
Topics Covered in other Articles
- What is a Spectrophotometer?
- Spectral Analysis of Organic Compounds
- IR Spectroscopy
Table of IR Spectrum Frequency Values
Ir spectrum stretching vibrations, ir spectrum bending vibrations, ir spectrum exercises.
After taking note of these values, put your knowledge to the test using Cheminfo’s interactive IR exercises IR spectrum analysis can be a little intimidating at the beginning, but remember, the more you practice, the easier it becomes
Furthur Reading
- Raman Spectroscopy
- X-Ray Crystallography
- NMR Spectroscopy
- Mass Spectrometry & Mass Spectrometers
- FTIR Spectrometer Accessories
- NIR Process Flow Cells
- Laboratory Hydraulic Presses & Pellet Dies
- Infrared Wire Grid Polarizers
- ATR-FTIR 101
- Who are we?
- Applications
- Lab Presses Guide
- Webinars & Events
- Product Documentation
- Technical Support
- Infrared Frequency Lookup
- Temperature Controller
- Sign Up for Our Newsletter
- Global Distributors
- Harrick Products
- Get A Quote
- Frequently Asked Questions
Infrared Frequency Lookup Tool
The lookup tool below is designed to provide insight into unknown peaks in your IR spectrum. It contains many common functional groups along with their characteristic IR absorption frequencies (in wavenumbers). For further reference, you can also find IR spectrum tables and information related to infrared spectroscopy, including a PDF version of the IR spectrum table.
Aldehyde/Ketone
Carboxylic acid, carboxylic acid anhydride, primary amine, secondary amine, tertiary amine, carbodiimide, thiocyanate, isothiocyanate, akyl fluoride, alkyl chloride, alkyl bromide, alkyl iodide.
Please note this tool may not function correctly with older browsers such as Internet Explorer. Please acknowledge Specac and link to this article if you use/reproduce this in anyway. To learn more about what spectroscopy can do, check out #SpectroscopySolutions for more insights into the applications XRF and FTIR can fit. Look up #SpectroscopyGuides for tips and tricks to help your analysis. Also, check out our #SpectroscopySolutions presence on YouTube!
The same information is also available to download as a poster (see right).
© 1971 - 2022 Specac Ltd. Registered Office: Science and Innovation Centre, Unit 12, Halo Business Park, Cray Ave, Orpington BR5 3FQ. Registered in England No. 01008689
Design & Build by GEO
- No products in the cart.
IMAGES
VIDEO
COMMENTS
The following table lists infrared spectroscopy absorptions by frequency regions.
An infrared spectroscopy correlation table (or table of infrared absorption frequencies) is a list of absorption peaks and frequencies, typically reported in wavenumber, for common types of molecular bonds and functional groups.
IR Tables, UCSC. Table 1. Characteristic IR Absorption Peaks of Functional Groups*.
This article will provide a table containing IR spectrum absorbtion frequency values and what they represent.
Table of Characteristic IR Absorptions m=medium, w=weak, s=strong, n=narrow, b=broad, sh=sharp frequency, cm –1 bond functional group 3640–3610 (s, sh) O–H stretch, free hydroxyl alcohols, phenols 3500–3200 (s,b) O–H stretch, H–bonded alcohols, phenols 3400–3250 (m) N–H stretch 1˚, 2˚ amines, amides
An important tool of the analytic and organic chemists is Infrared (IR) Spectroscopy. IR spectra are acquired on a special instrument, called an IR spectrometer. IR is used to gather information about compound's structure, assess its purity, and sometimes to identify it.
All IR values are approximate and have a range of possibilities depending on the molecular environment in which the functional group resides. Resonance often modifies a peak's position because of electron delocalization (C=O lower, acyl C-O higher, etc.). IR peaks are not 100% reliable. Peaks tend to be stronger (more intense)
The carbonyl stretching absorption is one of the strongest IR absorptions, and is very useful in structure determination as one can determine both the number of carbonyl groups (assuming peaks do not overlap) but also an estimation of which types.
The lookup tool below is designed to provide insight into unknown peaks in your IR spectrum. It contains many common functional groups along with their characteristic IR absorption frequencies (in wavenumbers).
When answering assignment questions, you may use this IR table to find the characteristic infrared absorptions of the various functional groups. However, you should be able to indicate in broad terms where certain characteristic absorptions occur.