What absorbs at 3786 cm⁻¹ in an FTIR spectrum?
A band near 3786 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 2 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Metal oxygen | 1 | 1 | 1.0 |
| Metal hydroxyl | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Lewis acid site | 1 | 1 | 1.0 |
| Adsorbed carbon monoxide | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
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Adsorbed carbon monoxide confidence 1.0
“The shouldering near 3786 and the band at are assigned to CO adsorbed on strong cm(cid:1)1 cm(cid:1)1 3770 Lewis acid sites.”
Benkhaled 等 - 2006 - Synthesis of highly dispersed palladium alumina su DOI: 10.1016/j.apcata.2006.06.011 -
Metal hydroxyl confidence 1.0
“FTIR Analysis Figure 5 shows the comparison of FTIR spectra for the samples prepared with different precipitation pH (7-12), where the sample at pH 10 has the Al-OH characteristic stretching vibration band around 3786 cm-1.”
Influence of Reaction pH towards the Physicochemical Characteristics of Phosphorylated Polyvinyl Alcohol-Aluminum Phosphate Nanocomposite DOI: 10.3390/coatings11091105
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