What absorbs at 438 cm⁻¹ in an FTIR spectrum?
A band near 438 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 |
|---|---|---|---|
| Metal oxygen | 3 | 3 | 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 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
confidence 1.0
“Thus the peaks at 463.7, 455 and Siga SiAs 438 cm1 could roughly correspond to 0, 1, 2 Al atoms around the SiA, site.”
Kaczor 等 - 1995 - Silicon-related local vibrational mode absorption DOI: 10.4028/www.scientific.net/MSF.196-201.1091 -
confidence 1.0
“An FTIR investigation shows that the SnO 2-doped GO nanocomposite exhibits two distinct bands at 733 and cm-1 cm-1 438 due to terminal oxygen vibrations, while samples treated with G-O-Sn-O exhibit bands at 733 due to antisymmetric stretchi”
Reactive Oxygen Species (ROS) Are Generated as Organic Contaminants Are Broken Down: SnO DOI: 10.1007/s12668-023-01111-3 -
Metal oxygen confidence 1.0
“LLM confirmed rule peak-group candidate”
Lai 等 - 2013 - Controlled Synthesis of CaWO4 Microcrystalline via DOI: 10.1080/10584587.2013.780145 -
Metal oxygen confidence 1.0
“due to metal-oxygen stretching vibrations (such as Fe-O, CuO, Mg-O, and Zr-O) at the octahedral and tetrahedral sites in cm-1 lattice.[26] the hexagonal The band at 438 occurs in the 4000 3500 3000 2500 2000 1500 1000 500 cm-1 octahedral si”
Mohammed 等 - 2018 - Enhanced dielectric and optical properties of nano DOI: 10.1088/1674-1056/27/12/128104 -
confidence 1.0
“S8a, b and c, pronounced cm-1, peaks were observed at 438 which corresponded to the binding of cationic ions of MG;”
Unveiling the role of novel biogenic functionalized CuFe hybrid nanocomposites in boosting anticancer, antimicrobial and biosorption activities DOI: 10.1038/s41598-021-87363-z -
Acetate confidence 1.0
“The band at 1097 corresponds to the C-O stretching vibration 438 (Arjmandi et al., 2015a;”
Influence of montmorillonite/carbon nanotube hybrid nanofillers on the properties of poly(lactic acid) DOI: 10.1016/j.clay.2020.105925 -
Metal oxygen confidence 1.0
“FTIR spectra peaks fall below 800 The stretching and twisting vibrations of the Zn-O bonds cm-1 are what cause the high intensity peaks at 438, 472, 499, and 519 [18-19].”
Shuaib 等 - 2023 - Investigation the effect of Co3O4 doping on struct DOI: 10.15251/DJNB.2023.181.307 -
confidence 0.9
“attributed to E2 (high) mode”
Combustion synthesis, characterization and Raman studies of ZnO nanopowders DOI: 10.1016/j.saa.2011.05.043
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