What absorbs at 1447 cm⁻¹ in an FTIR spectrum?
A band near 1447 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 1447 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 |
|---|---|---|---|
| Alkyl C-H | 14 | 13 | 1.0 |
| Carbonate | 5 | 5 | 1.0 |
| Aromatic ring | 3 | 3 | 1.0 |
| Methyl | 2 | 2 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| N h | 2 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 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 |
|---|---|---|---|
| PVA | 1447, 1660, 2930 | Alkyl C-H | 1 |
| bentonite | 1447, 882, 918 | Carbonate | 1 |
| chitosan | 1447, 1650, 1655 | Alkyl C-H | 1 |
| chitin | 1447, 1650, 1655 | Alkyl C-H | 1 |
| silver nanoparticles | 1447, 1636, 1631 | 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 1447 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
-
Alkyl C-H confidence 1.0
“The bands 1447cm-1 at 4323 and are assigned to be CH and OH bending 2 3851cm-1 3.6.”
Badr 和 Mahmoud - 2006 - Effect of PVA surrounding medium on ZnSe nanoparti DOI: 10.1016/j.saa.2005.12.015 -
Carbonyl (C=O) confidence 1.0
“FTIR spectra for chitosan gave a characteristic - Pre-proof cm-1 cm-1 NH2 band of 3447 and a carbonyl group band of 1447 from mussel shell [10].”
Sudatta 等 - 2020 - Extraction, characterization and antimicrobial act DOI: 10.1016/j.ijbiomac.2020.06.291 -
Alkyl C-H confidence 1.0
“Figure 2 shows that the FTIR spectrum of the Si-NP modified by TSM using used cm-1 solvent had a strong absorption peak at wave number 2927.94 and 1446.61 cm-1 associated with -CH group vibration and deforming vibration of the -C-H”
Wahyuningsih 等 - 2021 - Characteristics of Silica Nanoparticles from Rice DOI: 10.5614/j.eng.technol.sci.2021.53.4.3 -
C c single bond confidence 1.0
“The 1446.69 90 symmetrical C=C-C stretching frequency of the benzene rings become intense at 1555 cm-1.”
Aktas 等 - 2020 - A Novel Ag-N-Heterocyclic Carbene Complex Bearing DOI: 10.3390/cryst10030171 -
Acetate confidence 1.0
“ν dominated by the band at 1447 characteristic of asymmetric stretching vibrations 3 of C-O bonds in carbonate anion, and resembles closely the previously reported spectra of natrite samples from different manufacturers [16].”
Rehydration Driven Na-Activation of Bentonite—Evolution of the Clay Structure and Composition DOI: 10.3390/ma14247622 -
Alkyl C-H confidence 1.0
“The peak at 1447 is related to the C-H bending vibration and N-H bending of secondary amines [49,51].”
Eucalyptus globulus and Salvia officinalis Extracts Mediated Green Synthesis of Silver Nanoparticles and Their Application as an Antioxidant and Antimicrobial Agent DOI: 10.3390/plants11081085 -
Alkene (C=C) confidence 1.0
“Additionally, RS spectra revealed a decrease in the lipid cm-1 unsaturation level expressed by the ratio of the 1661 band, corresponding to the cm-1 C=C stretching vibrations, to the 1447 band attributed to the scissoring mode of the”
Spectroscopic Signature of Red Blood Cells in a D-Galactose-Induced Accelerated Aging Model DOI: 10.3390/ijms22052660 -
Amide confidence 1.0
“The peak at 1447 cm-1 is assigned to the C-N and N-H vibrations of amide III.”
Preparation and Physicochemical Characterization of Softgels Cross-Linked with Cactus Mucilage Extracted from Cladodes of Opuntia Ficus-Indica DOI: 10.3390/molecules24142531
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