What absorbs at 1715 cm⁻¹ in an FTIR spectrum?
A band near 1715 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 |
|---|---|---|---|
| Carbonyl (C=O) | 19 | 18 | 1.0 |
| Carboxyl (COOH) | 5 | 4 | 0.95 |
| Ester | 3 | 3 | 0.9 |
| Alkene (C=C) | 2 | 2 | 1.0 |
| Imide | 1 | 1 | 0.9 |
| C-O single bond | 1 | 1 | 0.9 |
| Quinone | 1 | 1 | 0.9 |
| Alkyl C-H | 1 | 1 | 0.9 |
| Ketone | 1 | 1 | 0.9 |
| Hydrogen bond | 1 | 1 | 0.8 |
| N h | 1 | 1 | 0.7 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Alkene (C=C) confidence 1.0
“2, it is possible to observe an intense band in cm-1 the region of 1715 associated with the cis double bonds.”
Ariza Ortega 等 - 2012 - Analysis of trans fatty acids production and squal DOI: 10.2478/s11532-012-0104-4 -
Carbonyl (C=O) confidence 1.0
“Assigned to carbonyl groups”
Culica 等 - 2019 - Recyclable Polymer-Supported N-Hydroxyphthalimide DOI: 10.3390/ma12213585 -
Carboxyl (COOH) confidence 0.95
“Explicitly stated: 'distinctive peak at 1715 cm-1 attributed to the presence of COOH groups from the PAAc.'”
Zhou 等 - 2010 - Poly(dimethylsiloxane) Surface Modification by Pla DOI: 10.1166/jnn.2010.2826 -
Carboxyl (COOH) confidence 0.95
“Explicit assignment: characteristic peak corresponding to carboxyl group”
Zhou 等 - 2008 - One-step surface modification of poly(dimethylsilo DOI: 10.1117/12.810101 -
Carbonyl (C=O) confidence 0.95
“Explicit assignment: 'carbonyl groups (C=O peak) were observed' at 1715 cm-1.”
Tian 等 - 2019 - A Comprehensive Study on The Accelerated Weatherin DOI: 10.3390/ma12060876 -
Carbonyl (C=O) confidence 0.9
“Text: 'peak present at 1714.73 cm-1 represents -C=O'”
Khalid 等 - 2020 - Thiolated sodium alginate conjugates for mucoadhes DOI: 10.1016/j.ijbiomac.2020.08.116 -
Ketone confidence 0.9
“Specific absorption band for ketone groups at 1715 cm-1.”
Pinter 等 - 2004 - Thermo-oxidative degradation during creep crack gr DOI: 10.1002/masy.200451327 -
Ester confidence 0.9
“phthalate ester peak at 1715 cm-1”
Selvanathan 等 - 2017 - Ternary natural deep eutectic solvent (NADES) infu DOI: 10.1016/j.carbpol.2017.03.023
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