What absorbs at 3028 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3028 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。

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 3028 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

• N h 信頼度 1.0

  “N-H peaks in the complexed materials are the stretching shifts in 3126cm-1 3028cm-1 4+ NH from to and that of the bending mode 1441cm-1 1433cm-1 H-N-H 0.001 of from to when 30 wt.”

  Synthesis and characterizations of phthaloyl chitosan-based polymer electrolytes DOI: 10.1016/j.jnoncrysol.2012.04.019
• Hydroxyl (O-H) 信頼度 1.0

  “Immobilized graphene exhibits many and free hydroxyl stretch peak at 3028 Next, the cm21, prominent bands in the region of 675 to 1350 which can functionalized graphene sheets were treated with glutaraldehyde be attributed to aliphatic and”

  Kishore 等 - 2012 - Immobilization of beta-Galactosidase onto Function DOI: 10.1371/journal.pone.0040708
• 信頼度 1.0

  “whilst the characteristic peaks of CA (3028, 1678 and 1495 β-CD in Figure 3d is akin to that of due to its higher molecular weight compared with CA [32,33].”

  Molecular Assembly between Weak Crosslinking Cyclodextrin Polymer and trans-Cinnamaldehyde for Corrosion Inhibition towards Mild Steel in 3.5% NaCl Solution: Experimental and Theoretical Studies DOI: 10.3390/polym11040635
• Amine primary 信頼度 1.0

  “These bands, which are also present in the spectrum of the 4-aminothiophenol reactant, result from the presence of the covalently-bound aromatic modifier at the material cm-1), surface, and can be ascribed to aromatic primary amine N-H stre”

  Systematic optimization of poly(vinyl chloride) surface modification with an aromatic thiol DOI: 10.1016/j.eurpolymj.2017.09.030
• Alkyl C-H 信頼度 0.9

  “Explicit assignment in text”

  Nanoemulsion and nanogel containing Artemisia dracunculus essential oil; larvicidal effect and antibacterial activity DOI: 10.1186/s13104-022-06135-8
• Alkene (C=C) 信頼度 0.8

  “Text: '3028 m, stretch' and 'C=C'”

  Data analysis of “krokodil” samples obtained by street-like synthesis DOI: 10.1016/j.dib.2015.11.046
• 信頼度 0.8

  “Characteristic peak at 3028 attributed to SP2.”

  Nanoliposomes containing three essential oils from the Artemisia genus as effective larvicides against Aedes aegypti and Anopheles stephensi DOI: 10.1038/s41598-023-38284-6