What absorbs at 988 cm⁻¹ in an FTIR spectrum?
A band near 988 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 988 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.
Possibili assegnazioni di gruppi funzionali
| Gruppo funzionale | Fatti di supporto | Fonti citate | Affidabilità massima |
|---|---|---|---|
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.
Possible materials
| Materiale | Picchi di supporto | Overlapping groups | Fonti citate |
|---|---|---|---|
| polysulfone | 988, 1700, 2941 | Carboxyl (COOH) | 1 |
| clay | 988, 1736, 2855 | Carboxyl (COOH) | 1 |
| glycerol | 988, 1585, 1630 | Carboxyl (COOH) | 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 988 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.
Letteratura dietro queste assegnazioni
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Metal oxygen affidabilità 1,0
“around 988 - 1050 These bands are assigned to the stretching vibration of Yb-O [7].”
Hamzah 等 - 2012 - Chemical Durability of Yb doped Lead Tellurite Gla DOI: 10.4028/www.scientific.net/AMR.501.81 -
Hydroxyl (O-H) affidabilità 1,0
“The PtNPs/GNs/PG electrode showed bands at 988 cm-1, 1290 cm-1, 1632 cm-1 and 3222 cm-1, which confirms O-H bonding, C-N stretching and N-H, as well as CThebareelectrodestudiedbySEMshowsnodeposition(Figure6A)ontoPGE,whereas cm-1, which was”
An Amperometric Acetylcholine Biosensor Based on Co-Immobilization of Enzyme Nanoparticles onto Nanocomposite DOI: 10.3390/bios13030386 -
Alkyl C-H affidabilità 1,0
“cm-1, the C-H stretching vibration at 2942 cm-1, C-H bending vibrations at 1428 cm-1, and cm-1, cm-1, cm-1, 3322 the C-H stretching vibration at 2942 C-H bending vibrations at 1428 C-O-C stretching vibrations at 1049 cm-1, 988 cm-1, and 908”
Structural Analysis of Oxidized Sucrose and Its Application as a Crease-Resistant Crosslinking Agent DOI: 10.3390/polym14142842 -
affidabilità 1,0
“As principais bandas apresentadas são: banda característica de ligações Si-O-Si em 988 cm-1, cm-1, em 795 banda característica da camada octaédrica;”
Fernandes 等 - 2018 - Membranes of polysulfoneclay influence of differ DOI: 10.1590/S1517-707620170001.0317 -
Alkene (C=C) affidabilità 1,0
“Regarding cm-1 the 988 signals, this band disappeared overlapped by the trans double bond band (at”
Chemometric comparison of almond oxidation rates using kinetic parameters obtained by infrared spectroscopy DOI: 10.1002/jsfa.10513 -
Phosphate (PO4) affidabilità 1,0
“Moreover, in the samples synthesized from the phosphorylated polyols new bands could cm-1 cm-1 be identified at 1269 (P=O stretching vibration), 988 (P-O stretching vibration)”
Bio-Based Phosphate-Containing Polyester for Improvement of Fire Reaction in Wooden Particleboard DOI: 10.3390/polym15051093 -
Phosphate (PO4) affidabilità 1,0
“The peak at 1271.95 cm-1 could be ascribed to the stretching vibration of P=O, while the peak at cm-1 The peak at 1271.95 could be ascribed to the stretching vibration of P=O, while the peak at 987.74 cm-1 could be assigned to the vibration”
Synthesis of Phosphated K-Carrageenan and Its Application for Flame-Retardant Waterborne Epoxy DOI: 10.3390/polym10111268 -
Nucleic acid affidabilità 1,0
“(cm-1) (a) Direction Proposed Biomolecular Assignment * Wavenumber +ve 988 RNA stretching, ring bending of uracil Symmetric phosphate stretching modes”
Yap 等 - 2021 - Detection of Prostate Cancer via IR Spectroscopic DOI: 10.3390/membranes11080591
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