What absorbs at 1115 cm⁻¹ in an FTIR spectrum?
A band near 1115 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 1115 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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 6 | 4 | 1,0 |
| Acetate | 5 | 5 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Possible materials
| Materiāls | Atbalstošie pīķi | Overlapping groups | Citētie avoti |
|---|---|---|---|
| plasma | 1115, 1656, 1650 | Methacrylate, Acetate | 1 |
| serum | 1115, 1656, 1122 | Methacrylate | 1 |
| lignin | 1115, 1035, 1510 | Methacrylate, Acetate, C-O single bond | 1 |
| wood | 1115, 1740, 1730 | Methacrylate, Acetate, C-O single bond | 1 |
| PET | 1115, 1408, 800 | Methacrylate, Acetate, C-O single bond | 1 |
| polymer | 1115, 1718, 1722 | Methacrylate, Acetate, C-O single bond | 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 1115 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.
Literatūra aiz šiem piešķīrumiem
-
Acetate pārliecība 1,0
“Two regions, i.e., (1) between The characteristic peaks at 1115 and 1388 cm-1, 3600-3100 and (2) between 1,800 and 1,000 correspond to C-O-H stretching and C-H bending, cm-1 in the FTIR spectra are of particular interest.”
Hernandez-Vargas 等 - 2020 - Development and Characterization of Nanoparticles- DOI: 10.22207/JPAM.14.4.11 -
C c single bond pārliecība 1,0
“The peak assignments are: 1122 (C-C cm21 cm21 stretch), 1115 (C-C stretch), 1100 (Si-O cm21 stretch of clay), 1082 (Si-O stretch of clay and”
Loo 和 Gleason - 2004 - Investigation of polymer and nanoclay orientation DOI: 10.1016/j.polymer.2004.06.025 -
pārliecība 1,0
“acidophilus sources on BACs production by AA11 a peak at 1115 which is due to the strength of the Cshowed that the highest BACs' activity (12,246 AU/mL) O (Roach et al.”
Optimization of food-grade medium for co-production of bioactive substances by Lactobacillus acidophilus LA-5 for explaining pharmabiotic mechanisms of probiotic DOI: 10.1007/s13197-020-04894-5 -
Phosphate (PO4) pārliecība 1,0
“1115 cm-1 cm-1 (C=N (symmetric stretching P-O-C), 1034 (collagen), 1528 guanine, adenine, cytosine) and cm-1 (C=O 1759 ester group vibration of triglycerides).”
New approach to investigate Common Variable Immunodeficiency patients using spectrochemical analysis of blood DOI: 10.1038/s41598-019-43196-5 -
pārliecība 1,0
“two peaks at 1115 and 1043 These two last peaks, along cm-1, with the band at 591 can be ascribed to S-O stretches and bending vibrations in schwertmannite (Fe 8O 8(OH) 6SO 4), a hydroxysulfate mineral, commonly found in ocher cm-1 deposits”
Assessment of Easily Accessible Spectroscopic Techniques Coupled with Multivariate Analysis for the Qualitative Characterization and Differentiation of Earth Pigments of Various Provenance DOI: 10.3390/min12060755 -
pārliecība 1,0
“cm-1 - the appearance of new bands from 1115 (of high intensity) and 537 were assigned to silica and other oxides from FA, as seen in Figure 3.”
The Influence of Fly Ash on the Mechanical Properties of Water Immersed All Waste Composites DOI: 10.3390/polym14101957 -
Silicon (Si) pārliecība 1,0
“253 cm-1, cm-1 For the region below 1200 bands at 1115 and 1042 were related to Si-O 254 cm-1 stretching, and bands at 915-847 were due to AlMOH deformation (M = Al, Fe or Mg) 255”
Franca 等 - 2020 - Monitoring diclofenac adsorption by organophilic a DOI: 10.1016/j.envpol.2013.04.012 -
Acetate pārliecība 1,0
“3122.3w grindingandethyl Raman - - - 1671.7 m - 1284.0 s addition, bands observed at 1170, 1150 and 1134 cm-1 in the spectra of physical mixture are shifted to acetate Raman - - - 1671.7m - 1284.0s 3196.3 m lower values at ~1161, 1146 and 1”
Garbacz 等 - 2020 - Structural Characterization of Co-Crystals of Chlo DOI: 10.3390/pharmaceutics12070648
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