What absorbs at 671 cm⁻¹ in an FTIR spectrum?
A band near 671 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 8 cited sources
Quick answer
A band near 671 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 |
|---|---|---|---|
| Metal oxygen | 6 | 6 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 0.9 |
| Sulfate (SO4) | 1 | 1 | 0.9 |
순위는 단일 권위 규칙이 아닌 축적된 문헌 증거를 반영합니다. 항상 샘플 상황에 대해 확인하세요.
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 671 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
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Metal oxygen 신뢰도 1.0
“The Sn-O stretching is observed at 671 for binary zinc tin”
Effect of annealing temperature on optical properties of binary zinc tin oxide nano-composite prepared by sol⠍gel route using simple precursors: Structural and optical studies by DRS, FT-IR, XRD, FESEM investigations DOI: 10.1016/j.saa.2014.08.031 -
Metal oxygen 신뢰도 1.0
“All the cases of spectra that produced 𝐶𝑜 0.5𝑍𝑛 0.5𝐶𝑑 𝑥𝐹𝑒 (2-𝑥)𝑂 cm-1 cm-1), absorption peaks in the fingerprint region (400 -800 which is due to M-O stretching 671 that ensures the presence of ferrites in prepared samples and designates th”
Manimegalai 等 - 2022 - Experimental investigation on ferrofluid propertie DOI: 10.15251/DJNB.2022.172.661 -
Phosphate (PO4) 신뢰도 1.0
“ATD-FTIR spectra of the Salisbury's patina exhibit peaks at 2361, 2341 and 671 cm-1 (assigned to phosphates);”
Martin-Gil 等 - 2005 - The orange-brown patina of Salisbury Cathedral (We DOI: 10.1065/espr2005.05.257 -
Metal oxygen 신뢰도 1.0
“Also in the fingerprint cm-1 region, it has been observed peaks at around 671 and 507 represent vibration of Ag-O metal oxides [22-24].”
Rupiasih 等 - 2019 - The Current-Voltage Properties of ChAgNP Composit DOI: 10.1088/1757-899X/515/1/012064 -
Alkyl C-H 신뢰도 1.0
“cm1 cm1 stretching at 671.43 and 892.51 The peaks at 834.50 and 798.47 indicate C-H”
Agrawal 等 - 2023 - Biotreatment of azo dye containing textile industr DOI: 10.21203/rs.3.rs-1876766/v2 -
Metal oxygen 신뢰도 1.0
“Tamilselvi et al., 2013 449cm-1, 511cm-1, 584cm-1, 3.3.1 Combined Effect of Methanol to Oil Molar Ratio observed major peaks at 671cm-1, confirmed and Catalyst Loading which the presence of Mg-O vibrations.”
Ameen 等 - 2022 - Biodiesel Synthesis From Cucumis melo Var. agresti DOI: 10.3389/fenrg.2022.830845 -
신뢰도 1.0
“The absorption band at 671 is assigned to Ni-O-Si in calcined Ni 20/m-SiO 2, Ni 15Cu 5/m-SiO 2, Ni 10Cu 10/m-SiO 2, and Ni 5Cu 15/mcm-1”
Enhanced Cyclopentanone Yield from Furfural Hydrogenation: Promotional Effect of Surface Silanols on Ni-Cu/m-Silica Catalyst DOI: 10.3390/catal13030580 -
Alkene (C=C) 신뢰도 1.0
“[BBSQ-FeCl BBSQ-Cu2+ 3+] on ion,34 assigned to while the system Therefore,inordertoexploretheinteractionbetweenBBSQand Commons Downloaded [BBSQ-Cu2+], showed a peak at 671.3481, assigned to and Fe3+, Cu2+, Hg2+, and the metal chelator ethyl”
NIR squaraine dyes for dual colorimetric and fluorescent determination of Fe3+, Cu2+, and Hg2+ ions DOI: 10.1039/d3ra02419a
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