What absorbs at 933 cm⁻¹ in an FTIR spectrum?
A band near 933 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 |
|---|---|---|---|
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| Methacrylate | 4 | 4 | 1.0 |
| Acetate | 4 | 4 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Phosphate (PO4) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
confidence 1.0
“It is possible that the new peak of 933.03 eV may be due to Cu (I) species, while the energy band of 935.23 eV could be assumed to be due to Cu”
Ibrahim 等 - 2022 - Effect of Ammonium Sulfide on Sulfidization Flotat DOI: 10.3390/min12101193 -
C c single bond confidence 1.0
“At the length of the wavenumber of 933 another peak also appears, appears, indicating the presence of a C-C bond group.”
Glass Powder Additive on Recycled Polypropylene Filaments: A Sustainable Material in 3D Printing DOI: 10.3390/polym14010005 -
C c single bond confidence 1.0
“The films (C-C in melting temperature is higher for drawn at a higher bands at 933 and 947 (CH rocking);”
Vasanthan 和 Manne - 2013 - Strain-Induced Crystallization and Conformational DOI: 10.1021/ie401783y -
Phosphate (PO4) confidence 1.0
“cm-1, assignments of the phosphate related peaks are as follows: P-O stretching at 776 P-O-C cm-1, cm-1, cmsymmetric stretching at 933 P-O-C assymetric stretching at 1050 P=O at 1240 1.”
An appraisal of the thermal decomposition mechanisms of ILs as potential lubricants DOI: 10.1002/ls.1457 -
Carbohydrate confidence 1.0
“cm-1 (1) Band at 933 (assigned to carbohydrates) is specific for Col fungi (Fig.”
Erukhimovitch 等 - 2010 - Direct identification of potato's fungal phyto-pat DOI: 10.3233/SPE-2010-0483 -
Silicon (Si) confidence 1.0
“XPS A strong peak at 932.54 eV by Cu2p 3/2 EDAX The spectrum revealed the presence of elements like C, N, O, Si and Cu.”
Gupta 等 - 2015 - Silica functionalized Cu(II) catalysed selective o DOI: 10.1007/s12039-015-0902-2 -
Acetate confidence 1.0
“cm-1 cm-1 were observed at 1076 (C-O, axial deformation), 933 cm-1 (characteristic of 3, 6-anhydrogalactose) and 889 (attributed to Fourier transform infrared spectroscopy carbon)[16].”
Hu 等 - 2012 - Preparation of Berbamine Loaded Chitosan-agarose M DOI: 10.1590/S0104-14282012005000073 -
Acetate confidence 1.0
“Firstly in HeLa cells, the band at 933 was assigned to the vibrational mode of the C-O-C ring of deoxyribose in Z-form DNA (Banyay et al., 2003;”
Le Roux 等 - 2015 - Fourier Transform Infrared spectroscopy discloses DOI: 10.1016/S0301-4622
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