What absorbs at 613 cm⁻¹ in an FTIR spectrum?
A band near 613 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 613 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.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Metal oxygen | 3 | 2 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Silicon silicon | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| ZnO | 613, 1400, 3430 | Metal oxygen, Alkyl C-H | 1 |
| calcite | 613, 2850, 2864 | Alkyl C-H | 1 |
| ZnO nanoparticles | 613, 1219, 1726 | Alkyl C-H, Metal oxygen | 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 613 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.
Literature behind these assignments
-
Silicon (Si) confidence 1.0
“The x cm-1 typical IR absorption band located at 613 is associated to the Si-Si vibration [21].”
Lu 等 - 2013 - Red Light Emission from Silicon Created by Self-io DOI: 10.4028/www.scientific.net/AMM.320.109 -
confidence 1.0
“The band absorbed at 613 cm-1 and 580 is characteristic of the Zn-O bond, which confirms the formation of zinc cm-1 oxide [53,54].”
Abdelmigid 等 - 2022 - Green Synthesis of Zinc Oxide Nanoparticles Using DOI: 10.3390/molecules27041236 -
confidence 1.0
“Further addition of new peaks at 613 and 426 cm-1 strongly revealed the growth of inorganic particles (due to (a.u.) Fe-O vibrations) on the NSS surface.”
Facile Synthesis of Magnetic Nigella Sativa Seeds: Advances on Nano-Formulation Approaches for Delivering Antioxidants and Their Antifungal Activity against Candida albicans DOI: 10.3390/pharmaceutics15020642 -
Hydrogen bond confidence 1.0
“cm-1) was previously reported for the band at 613 (<1000 region It has been shown before for complexes with linear (cid:1) H-bonds that the red shift of the NH stretching mode, 1, The temperature dependence of the spectrum of pure and the b”
Rozenberg 等 - 2004 - Low temperature FTIR spectroscopy and hydrogen bon DOI: 10.1016/S1386-1425(03)00251-8 -
Hydroxyl (O-H) confidence 1.0
“813/772 and asymmetrical out of phase stretching out-of-plane 613/580/550/511 -OH bending and CH rocking 2 ν-stretchingvibrations;δ-deformationvibrations Note: Molecules 2023, 28, x FOR PEER REVIEW 6 of 19”
Rozylo 等 - 2023 - Micronized Powder of Raspberry Pomace as a Source DOI: 10.3390/molecules28124871 -
S eq o confidence 1.0
“sorption peaks due to the stretching vibration and out-of-plane bending vibration of C=O belong to the asymmetric stretching vibration of -SO and S=O, and the absorption peaks 33cm-1 -SO and 1043 belong to the asymmetric stretching vibratio”
Application of a Superplasticizer in Scheelite Selective Flotation from Calcite DOI: 10.3390/min12040483 -
Alkyl C-H confidence 1.0
“indica synthesized by supernatant of cm-1 boxylic group and the band at 613 is due to C-H 123”
Inhibition of a sulfate reducing bacterium, Desulfovibrio marinisediminis GSR3, by biosynthesized copper oxide nanoparticles DOI: 10.1007/s13205-016-0403-0 -
confidence 1.0
“cm-1 CH-rocking), 964 (assigned to trans CH wagging), and cm-1 C-Cl 613 (assigned to stretching), which were the polymer.45,46 shows the change in the optical absorption spectra of characteristics of the PVC After adding Ag and cm-1, ∼3439”
Zulfi 等 - 2023 - Electrospun Nanofibers from Waste Polyvinyl Chlori DOI: 10.1021/acsomega.3c01632
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