What absorbs at 1994 cm⁻¹ in an FTIR spectrum?
A band near 1994 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 4 cited sources
Quick answer
A band near 1994 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
| 작용기 | 지원 사실 | 인용 출처 | 최고 신뢰도 |
|---|---|---|---|
| Carboxyl (COOH) | 2 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| C-O single bond | 1 | 0 | 0.9 |
순위는 단일 권위 규칙이 아닌 축적된 문헌 증거를 반영합니다. 항상 샘플 상황에 대해 확인하세요.
Possible materials
| 재료 | 지원 피크 | Overlapping groups | 인용 출처 |
|---|---|---|---|
| Pt | 1994, 1042, 1230 | C-O single bond | 1 |
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 1994 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
-
Aromatic ring 신뢰도 1.0
“The sharpness of the feature acids) may occur in the form of carboxylates (Stevenson, suggests that it may be an aromatic ring vibration, though 1994;”
Hay 和 Myneni - 2007 - Structural environments of carboxyl groups in natu DOI: 10.1016/j.gca.2007.03.038 -
Carboxyl (COOH) 신뢰도 1.0
“et al., to 1800 the carboxylate groups band) show abcm-1) 1994), as well as (3) between OM and mineral surfaces in (i.e., sorption bands at lower WN 1550 to 1620 (Tab.”
Ellerbrock 和 Gerke - 2021 - FTIR spectral band shifts explained by OM-cation i DOI: 10.1002/jpln.202100056 -
신뢰도 0.9
“New band assigned to CO”
Hossain 等 - 2020 - Preference for low-coordination sites by adsorbed DOI: 10.1039/c9na00499h -
신뢰도 0.9
“Peak assigned to CO”
High-yield synthesis of PVP-stabilized small Pt clusters by microfluidic method DOI: 10.1016/j.cattod.2011.10.008
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