What absorbs at 3306 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3306 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.

가능한 작용기 할당

순위는 단일 권위 규칙이 아닌 축적된 문헌 증거를 반영합니다. 항상 샘플 상황에 대해 확인하세요.

Possible materials

Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.

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 3306 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.

이 할당의 배경이 되는 문헌

• Hydroxyl (O-H) 신뢰도 1.0

  “cm-1 the FTIR (ATR) The broad band at 3306.05 revealed study reported a lower value of crystallinity index From Previous presence of OH group in cellulose [20,21], while the band PALF, which was 13.74% compared to the current study [30].”

  Characterization of silane treated Malaysian Yankee Pineapple AC6 leaf fiber (PALF) towards industrial applications DOI: 10.1016/j.jmrt.2020.01.058
• Hydroxyl (O-H) 신뢰도 1.0

  “However, the absorption peaks at 3306 due to stretching of O-H appear in all spectra, where they are belonging to PVA.”

  Highly Conductive Polyelectrolyte Membranes Poly(vinyl alcohol)/Poly(2-acrylamido-2-methyl propane sulfonic acid) (PVA/PAMPS) for Fuel Cell Application DOI: 10.3390/polym13162638
• 신뢰도 1.0

  “It exhibits a relatively broad peak at about 3306 cm-1 attributed to the N-H stretching vibrations (with NH involved in”

  Evaluation of Water Sorption and Solubility and FTIR Spectroscopy of Thermoplastic Orthodontic Retainer Materials Subjected to Thermoforming and Thermocycling DOI: 10.3390/app13085165
• Hydroxyl (O-H) 신뢰도 1.0

  “TEM 2114, and 1635 The peaks at 3306 and 2114 reveals that the CRE-AgNPs are spherical in shape with a wellcorrespond to the stretching vibration of OH in the alcoholic C�C”

  Bakthavatchalam 等 - 2023 - Biogenic Synthesis and Characterization of Silver DOI: 10.1021/acsomega.2c07531
• 신뢰도 1.0

  “Fourier Transform Infrared Spectroscopy (FTIR) Analysis with N-H stretching frequency, occurred at 3304.82 and 3305.90 cm-1 for ASC and PSC, respectively.”

  Physicochemical Properties and Biocompatibility Evaluation of Collagen from the Skin of Giant Croaker (Nibea japonica) DOI: 10.3390/md16070222
• Hydroxyl (O-H) 신뢰도 1.0

  “The maximum of hydroxyl band shifts from 3306 cm-1 to 3391 cm-1 in both types of the samples.”

  Ziegler-Borowska 等 - 2018 - Photochemical Reactions in Dialdehyde Starch DOI: 10.3390/molecules23123358
• 신뢰도 0.9

  “assigned to -CO-NH-”

  Liu 等 - 2013 - Synthesis and Application of a Novel Polyamide Cha DOI: 10.1155/2013/616859
• N h 신뢰도 0.9

  “Explicit assignment: '3305.87 symmetric stretching' and 'N-H'”

  Ni -chitosan/carbon nanotube: An efficient biopolymer -inorganic catalyst for selective hydrogenation of acetylene DOI: 10.1016/j.heliyon.2023.e13523