What absorbs at 1526 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1526 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.

可能性のある官能基アサイン

ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。

Spectrum logic

This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 1526 cm⁻¹ is usually not enough for material identification by itself.

Real-world usage

This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.

Common mistakes

• Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
• Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
• Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.

Verification advice

When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.

これらのアサインの根拠となる文献

• Amide 信頼度 1.0

  “As noted above, this peak can be assigned to 1526 either amide II vibration or Lys side chain.”

  Alteration of Sugar-Induced Conformational Changes of the Melibiose Permease by Mutating Arg141 in Loop 4-5 DOI: 10.1016/j.bpj.2009.03.025
• N h 信頼度 1.0

  “The peak at 1526 was assigned to Parameters Value the secondary -NH stretching mode.”

  Attenuated total reflection‐Fourier transform infrared spectroscopy (ATR‐FTIR) for quantification of piroxicam in tablet dosage from as a green analytical method DOI: 10.1002/vjch.202000049
• Amide 信頼度 1.0

  “The amide II vibrations located at 1526 and cm-1, 1525 respectively, are related to the leaf structures”

  Effect of Ethanol Post-Treatments over Sericin Scaffolds for Tissue Engineering Applications DOI: 10.1007/s10924-022-02647-3
• Alkyl C-H 信頼度 1.0

  “A prominent CH stretching mode at 1526 L-tyrosineand1mM3-fluorotyrosinein20mMphosphatebufferatpH7.8”

  Hydrogen Bonding in Human Manganese Superoxide Dismutase Containing 3-Fluorotyrosine DOI: 10.1529/biophysj.105.060616
• Acetate 信頼度 1.0

  “observed at 1632 cm-1 is assigned to C=O stretching of amide I, while the band around 1526 cm-1 is Molecules 2019, 24, x FOR PEER REVIEW”

  Preparation and Physicochemical Characterization of Softgels Cross-Linked with Cactus Mucilage Extracted from Cladodes of Opuntia Ficus-Indica DOI: 10.3390/molecules24142531
• C c single bond 信頼度 1.0

  “Theethylenic stretching cm(cid:2)1 in the ground state and vibration of retinal is at 1526 cm(cid:2)1 in L, whereas the C-C stretching vibration ab1548 cm(cid:2)1 cm(cid:2)1 and 1169 in ground state bR and at sorbs at 1201 cm(cid:2)1 in L.”

  Time-Resolved Microspectroscopy on a Single Crystal of Bacteriorhodopsin Reveals Lattice-Induced Differences in the Photocycle Kinetics DOI: 10.1529/biophysj.106.083345
• N h 信頼度 1.0

  “a cm-1 cm-1 stretching vibration), 3193 (O-H stretching vibration), 1640 (C=O stretching n u cm-1 vibration) and 1526 (CO-NH stretching vibration).”

  Spray Dried Inhalable Ivacaftor Co-Amorphous Microparticle Formulations with Leucine Achieved Enhanced In Vitro Dissolution and Superior Aerosol Performance DOI: 10.1016/j.ijpharm.2022.121859.
• N h 信頼度 1.0

  “For 1518/1526cm-1,possiblyindicatingabandofPhQ-at1518cm-1witha 1_O UQ in the Q binding site the C is H-bonded to the backbone NH A correspondingbandin2MNQ-at1526cm-1.Thisproposalisinlinewith”

  Hastings - 2015 - Vibrational spectroscopy of photosystem I DOI: 10.1016/j.bbabio.2014.07.014