Ester — FTIR absorption peaks and assignments

Quick answer

Ester is usually assigned by looking for a recurring cluster of characteristic peaks rather than one exact textbook number. The table below shows where the literature most often places this group in FTIR, ranked by accumulated evidence.

Characteristic FTIR peaks for Ester

Showing the 30 best-supported peaks of 980 total for Ester.

Possible materials

Spectrum logic

A functional-group assignment becomes more confident when several expected bands appear together. Use this page to find the strongest-supported peaks, then confirm that the same sample exhibits a coherent pattern rather than a single isolated hit.

Real-world usage

These pages are useful for unknown material analysis, peak explanation in reports, polymer troubleshooting, and verifying whether a candidate material family is chemically plausible.

Common mistakes

• Using one functional-group page as a complete material verdict without checking the rest of the spectrum.
• Assuming the strongest band is always the most diagnostic one.
• Forgetting that processing, additives, aging, and mixtures can shift or broaden expected peaks.

Verification advice

Use DSC, GC-MS, or TGA when several material families share similar bands or when mixture effects make the FTIR assignment uncertain.

Literature behind these assignments

• 1735 cm⁻¹ confidence 1.0

  “The new peak appears cm-1 at 1735 which indicates the presence of a C=O bond from carboxylic acid.”

  Arizka 等 - 2019 - Synthesis and Physical Properties Characterization DOI: 10.1088/1757-899X/546/4/042004
• 1715 cm⁻¹ confidence 1.0

  “are assigned to ester pectin polymer chains and the methyl group of the methyl ester The bands at 1715 and 1632 -COO(cid:0) CO-CH3”

  Optimization of citron peel pectin and glycerol concentration in the production of edible film using response surface methodology DOI: 10.1016/j.heliyon.2023.e13724
• 1713 cm⁻¹ confidence 1.0

  “This means that the addition shows sharp absorption and low intensity at 1712.8 cm-1 of DVB is able to shift the hydroxyl bonds in blends, which indicates the presence of C=O carbonyl so that DVB makes the blends more compatible.”

  Aritonang 等 - 2019 - Grafting of Oleic Acid On Cyclic Natural Rubber Re DOI: 10.13005/ojc/350119
• 1723 cm⁻¹ confidence 1.0

  “The other cm21 longed TC-HCl release, PHT-Na release behavior revealed that it peaks such as 1723 and 2941 corresponding to ester and can help the wound dressings to heal the wounds during 24 h carbon-hydrogen bonds in the chemical structur”

  Askari 等 - 2016 - Three-layered electrospun PVAPCLPVA nanofibrous DOI: 10.1002/app.43309
• 1746 cm⁻¹ confidence 1.0

  “CO diesel is monitored by the ester stretch (1746 The impact of water on the precision of the biodiesel mixture is determined using a Karl Fischer titration to monitor water content.”

  Ault 和 Pomeroy - 2012 - Quantitative Investigations of Biodiesel Fuel Usin DOI: 10.1021/ed101097n
• 3275 cm⁻¹ confidence 1.0

  “The two prominent peaks at 3275.13 and 1635.54 are typical of N-H bond of amines and C=C stretch of alkenes or C=O stretch of amides [42] respectively.”

  Biomedical Applications of Cocoa Bean Extract-Mediated Silver Nanoparticles as Antimicrobial, Larvicidal and Anticoagulant Agents DOI: 10.1007/s10876-016-1055-2
• 3401 cm⁻¹ confidence 1.0

  “Obvious Fourier transform infrared cm-1, cm-1, (FTIR) spectra for the GT extract were observed, showing absorption bands at 3401 1628 cm-1, and 1029 corresponding to O-H/N-H, C=O, and C-O groups, respectively.”

  Aziz 等 - 2017 - From Insulating PMMA Polymer to Conjugated Double DOI: 10.3390/polym9110626
• 1730 cm⁻¹ confidence 1.0

  “cm-1 The peak at 1730 was assigned to C=O stretching from unconjugated ketone, carbonyl, and origin63.”

  Physicochemical characterisation of barley straw treated with sodium hydroxide or urea and its digestibility and in vitro fermentability in ruminants DOI: 10.1038/s41598-022-24738-w