What absorbs at 602 cm⁻¹ in an FTIR spectrum?
A band near 602 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 602 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 |
|---|---|---|---|
| Phosphate (PO4) | 9 | 9 | 1.0 |
| Aromatic ring | 3 | 3 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Bromine | 1 | 1 | 1.0 |
| Carbon bromine | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| Fe3O4 | 602, 2358, 1673 | Metal oxygen, Alkyl C-H | 1 |
| hydroxyapatite | 602, 1620, 1639 | Phosphate (PO4), Alkyl C-H | 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 602 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
-
confidence 1.0
“The peak cm-1 at 602 can be attributed to terminal oxygen vibration cm-1 of Sn-OH, while the peak appearing at 688 is due to (F1).”
Synthesis, structural and optical properties of Fe-doped nanocrystalline SnO2 DOI: 10.1007/s10854-017-7018-z -
Metal oxygen confidence 1.0
“LLM confirmed rule peak-group candidate”
Hassanien 等 - 2019 - Novel green route to synthesize cadmium oxide@grap DOI: 10.1088/2053-1591/ab23ac -
confidence 1.0
“to lower frequency of 1610 is 1633 [995]/Peak Area [602], decreased in the order of low Area caused by the partial attraction of electron density in to high concentration of silica functionalized with Ti4+ C=N ion.”
Yuan 等 - 2015 - Hydrophobic effect of silica functionalized with s DOI: 10.1007/s12039-015-0965-0 -
confidence 1.0
“cm-1 In the FTIR spectrum of Fe 3O 4, it is possible to verify a band of vibration at 602 typical of bonding cm-1 cm-1 Fe-O.”
Bruckmann 等 - 2022 - Synthesis, Characterization, and Biological Activi DOI: 10.21203/rs.3.rs-1025029/v1 -
Alkyl C-H confidence 1.0
“The in-plane bending band of C-H in the aromatic hydrocarbon is detectable at 1321 cm-1, and out-of-plane bending bands are at 818 and 602 cm-1.”
Synthesis of Bioactive Chlorogenic Acid-Silica Hybrid Materials via the Sol–Gel Route and Evaluation of Their Biocompatibility DOI: 10.3390/ma10070840 -
Phosphate (PO4) confidence 1.0
“Moreover, the bands that could be found at 564 and 602 cm-1 were due to the υ4 (triply degenerate) molecular vibration of the O-P-O bond and their presence in the FTIR spectra indicate that the hydroxyapatite is well structured [23,24,26,47”
Physicochemical Characterization of Europium-Doped Hydroxyapatite Thin Films with Antifungal Activity DOI: 10.3390/coatings12030306 -
confidence 1.0
“melting point of this compound is between 94 and 75∘ C-O Axial deformation 1134 C, Compared to the melting point of 2,5-dimethylphenol, it appears that the increase in temperature recorded is C-I Vibration 602 consistent,giventhattheadditio”
Fontana 等 - 2015 - Synthesis and Characterization of PPV Monomer for DOI: 10.1155/2015/620938 -
Phosphate (PO4) confidence 1.0
“Vibrations at 582 593 and 606 are attributed to PO cm-1, the υ4 (PO43-) at 570 and 602 cm-1, υ1 (PO43-) at 962 cm-1, and υ3 (PO43-) at 1051 and 4 vibrations (asymmetric O-P-O bending mode) [46,49-51].”
Gavinho 等 - 2023 - An Eco-Friendly Process to Extract Hydroxyapatite DOI: 10.3390/jfb14050279
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