What absorbs at 3150 cm⁻¹ in an FTIR spectrum?
A band near 3150 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 5 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 3 | 3 | 0.95 |
| N h | 2 | 2 | 0.9 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
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confidence 0.95
“Explicit assignment: 'O(10)-H...O(4) band at 3150 corresponds to the hydrogen bridge'.”
Weis 等 - 2016 - Polarized IR and Raman spectra of zoisite insight DOI: 10.1127/ejm/2016/0028-2528 -
N h confidence 0.9
“Explicit assignment: 'N-H stretching (3500 and 3150)'.”
Sousa Vieira 等 - 2019 - Waterborne poly(urethane-urea)s films as a sustain DOI: 10.1515/spma-2019-0001 -
Hydroxyl (O-H) confidence 0.8
“Same context as above.”
Slaughter 和 Stevens - 2014 - A cost-effective two-step method for enhancing the DOI: 10.1007/s13206-014-8105-3 -
Hydroxyl (O-H) confidence 0.8
“Absorption minima at 3150 cm-1 for OH-stretching region.”
Ketren 等 - 2019 - Investigation on Conversion Pathways in Degradativ DOI: 10.3390/en12030528 -
N h confidence 0.8
“Text: 'overlapped with the peak of at 3150 N-H'”
Yu 等 - 2012 - Hydrothermal Synthesis of Nanosized Sulfated Zirco DOI: 10.5012/bkcs.2012.33.2.524
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