What absorbs at 1261 cm⁻¹ in an FTIR spectrum?
A band near 1261 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
Hurtigt svar
A band near 1261 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Acetate | 15 | 15 | 1,0 |
| Methoxy (OCH3) | 14 | 14 | 1,0 |
| Methacrylate | 14 | 14 | 1,0 |
| C-O single bond | 13 | 13 | 1,0 |
| Alkyl C-H | 7 | 7 | 1,0 |
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Silicon carbon | 3 | 3 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| C c single bond | 3 | 3 | 1,0 |
| Ring structure | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Methyl | 2 | 2 | 1,0 |
| Lignin | 2 | 2 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Thiocarbonyl | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| PLA | 1261, 1650, 1073 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| asphalt | 1261, 1600, 1376 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 1261 cm⁻¹ is usually not enough for material identification by itself.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Hydroxyl (O-H) tillid 1,0
“CR occurs at the peak of 1261 1094 1031 804.7 and 667 cm-1, cm-1 cm-1 The absorption peaks at 1261 1094 and 1031 are identified as the bending vibrations of O-H, stretching vibrations of C-O and stretching vibrations of 804.7cm-1 S=O, respe”
Liang 等 - 2017 - Thermo-stability and aging performance of modified DOI: 10.1016/j.matdes.2017.04.060 -
Phosphate (PO4) tillid 1,0
“cm-1 which According to [17], sago starch modified with STMP has a new peak at wave number 1261.38 indicates the presence of vibrations of phosphate groups.”
Rahim 等 - 2021 - Physicochemical properties of phosphate butyrate a DOI: 10.1088/1755-1315/681/1/012043 -
Borate tillid 1,0
“As shown in Table 2, the the two ranges from 1200 to 1600 and 600 to cm-1 cm-1 vibrational peak 1261 is ascribed to B-O 800 are attributed to BO groups [20].”
Fabrication, physical, thermal and optical properties of oxyfluoride glasses doped with rare earth oxides DOI: 10.1007/s10854-021-06410-7 -
C-O single bond tillid 1,0
“OH stretching vibration 1378 1375 C-O-C symmetric stretching vibration 1261,1104,1050 1284,1111,1068”
Abdulmajid 等 - 2019 - Physicochemical Studies of Tamarind Shell Tannins DOI: 10.1039/C4RA10691A -
C=n tillid 1,0
“cm-1, cm-1, at 1579.7 1442.96 1251.09 1322.80 1291.65 1261.41 stretching, and -C=N stretching.”
Design and Characterization of Baricitinib Incorporated PLA 3D Printed Pills by Fused Deposition Modeling: An Oral Pill for Treating Alopecia Areata DOI: 10.3390/polym15081825 -
Alkyl C-H tillid 1,0
“the spectra of PVRm show a very pronounced peak with a maximum of 1261 This peak is connected to the CH symmetric deformation of polydimethylsiloxane (PDMS) [23].”
Andjelic 等 - 2023 - Characterization of Different Types of Epiretinal DOI: 10.3390/ijms24054834 -
Acetate tillid 1,0
“This was also the case for the characteristic band of 1261 (C-O stretching (C-O stretching vibration) from the spectrum of hypericin on the spectrum of Fe3O4@PDA/Hyp.”
A Facile Approach for Fabrication of Core-Shell Magnetic Molecularly Imprinted Nanospheres towards Hypericin DOI: 10.3390/polym9040135 -
Amide tillid 1,0
“cm-1 The latter also shows the lack of the new amide III band at 1261 which is pronounced for the blue class (Figure 1I).”
Fourier Transform Infrared Polarization Contrast Imaging Recognizes Proteins Degradation in Lungs upon Metastasis from Breast Cancer DOI: 10.3390/cancers13020162
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