What absorbs at 2103 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 2103 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 2103 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

• 信頼度 1.0

  “= 0.25 kJ/mol) (θ ML) is very close (170 amount of CO on O-Pt(111) gives an IR band at 2107 Pt(111) surface O kJ/mol) to that on a clean Pt(111) surface (177 at the same ascribed to a L CO species on terrace sites interacting with cm-1 spec”

  Bourane 和 Bianchi - 2003 - Oxidation of CO on a PtA1(2)O(3) catalyst from t DOI: 10.1016/S0021-9517(03)00267-7
• C#c 信頼度 1.0

  “explicit assignment”

  Fabrication of Hypericin Imprinted Polymer Nanospheres via Thiol-Yne Click Reaction DOI: 10.3390/polym9100469
• C#c 信頼度 1.0

  “It can be seen that, neither characteristic The shell of magnetic nanospheres was analyzed by FTIR spectroscopy to verify the thiol-yne click (C≡C (C≡C absorptions at 2103 and 3274 cm-1 and C-H in alkynyl groups) on monomer 1 [29], nor abso”

  Fabrication of Core-Shell Magnetic Molecularly Imprinted Nanospheres towards Hypericin via Click Polymerization DOI: 10.3390/polym11020313
• 信頼度 0.9

  “Assigned to higher ion per literature [13,14].”

  Zhang 等 - 2003 - FT-IR investigations of ion association in PEO-MSC DOI: 10.1016/j.ssi.2003.08.051