What absorbs at 1285 cm⁻¹ in an FTIR spectrum?
A band near 1285 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
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Methacrylate | 6 | 5 | 1.0 |
| C-O single bond | 6 | 5 | 1.0 |
| Acetate | 6 | 5 | 1.0 |
| Methoxy (OCH3) | 5 | 4 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| N c o | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 0.7 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
N c o confidence 1.0
“The peaks at 1285 and 1078 are due to Ar-O = prepared with NCO/OH 2 are shown in Figure 3A and B, and R-O stretching, respectively, showing the presence of 1700 1720”
Shoaib 和 Bahadur - 2016 - Synthesis of thermally and mechanically improved p DOI: 10.1515/epoly-2016-0134 -
Acetate confidence 1.0
“An intense peak at 2 cm-1 C=O 1710 is due to the stretching vibration and the cm-1 C-O signal at 1285 is attributable to the stretch.”
β-cyclodextrin coating: improving biocompatibility of magnetic nanocomposites for biomedical applications DOI: 10.1007/s10856-020-6361-4 -
Silicon (Si) confidence 1.0
“3379cm-1 3381cm-1 mightbeduetoCa-Ostretchingvibrations,whiletheintense and are ascribed to Al-OH and AlSi1123cm-1 bands at 953 and OH/Li-vibrations, respectively [36], since Al3+ and Fe3+ attributed to Si-O strong 1389cm-1 replace the Si4+”
Ahmad 等 - 2021 - Spectroscopic Analysis for Harnessing the Quality DOI: 10.1155/2021/6629640 -
Amide confidence 1.0
“PVP displayed a carbonyl stretching band at 1655 a band at 1655 cm-1, a group of C-H deformation-related bands around 1450 cm-1, CH2 cm-1, group of C-H deformation-related bands around 1450 CH wagging coupled with C2 wagging coupled with C-”
Polypyrrole Aerogels: Efficient Adsorbents of Cr(VI) Ions from Aqueous Solutions DOI: 10.3390/gels9070582 -
Acetate confidence 1.0
“correspond to the C-C bond are centered at 1350 and 1325 cm-1 for the gauche and trans conformation, cm-1 gauche trans the C-C bond are centered at 1350 and 1325 for the and conformation, while the while the absorption bands that correspond”
Bollas 等 - 2017 - Polymer Conformation under Confinement DOI: 10.3390/polym9020073 -
Amide confidence 1.0
“peaks at 1285 1207 1115 and cm-1 1075 were attributed to C-N and C-O-C stretching vibrations, C-O stretching vibration cm-1”
In Vitro Interaction of Doxorubicin-Loaded Silk Sericin Nanocarriers with MCF-7 Breast Cancer Cells Leads to DNA Damage DOI: 10.3390/polym13132047 -
Alkyl C-H confidence 1.0
“The oleic acid showed principal peaks at 2922 cm-1, 2853 1708 1412 1285 and 935 that indicated asymmetric CH stretching, 2 cm-1, 1708 cm-1, 1412 cm-1, 1285 cm-1 and 935 cm-1 that indicated asymmetric CH2 stretchsymmetric CH stretching, C=O”
In Vitro and Ex Vivo Evaluation of Fluocinolone Acetonide–Acitretin-Coloaded Nanostructured Lipid Carriers for Topical Treatment of Psoriasis DOI: 10.3390/gels8110746 -
Hydroxyl (O-H) confidence 1.0
“The spectra of catechin displayed cm-1 cm-1, cm-1, peaks at 3482 representing O-H stretching regions, and 1656 1285 cm-1 cm-1 1150 and 1071 representing the existence of aromatic rings [25].”
Shah 等 - 2022 - Encapsulation of Catechin into beta-Glucan Matrix DOI: 10.3390/foods11101493
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