What absorbs at 1258 cm⁻¹ in an FTIR spectrum?
A band near 1258 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 1258 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 |
|---|---|---|---|
| Alkyl C-H | 6 | 6 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Silicon carbon | 3 | 3 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 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 |
|---|---|---|---|
| PET | 1258, 1408, 800 | Methacrylate, Alkyl C-H, C-O single bond | 1 |
| Polystyrene | 1258, 1020, 1600 | Alkyl C-H, Methacrylate, Amide | 1 |
| Polyethylene | 1258, 1737, 1720 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| collagen | 1258, 1408, 1660 | Amide, Methacrylate, Alkyl C-H | 1 |
| hydroxyapatite | 1258, 1620, 1639 | Alkyl C-H, Methacrylate, Amide | 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 1258 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
“1 showed the overall pattern of both spectra which indi1265cm(cid:3)1 cm(cid:3)1 addition, peaks around and 1258 were attributed cated the basis absorption of mid infrared for the raw material of C@O to bond of flavonoids, steroidal and tri”
Chen 等 - 2014 - Determination of chemical changes in Isatis indigo DOI: 10.1016/j.saa.2014.01.048 -
C c single bond tillid 1,0
“1074 stretching 1113 C-H wagging at benzoic ring C-N stretching in imidazole ring and C-C stretching between 1258”
Degradation of Losartan Potassium Highlighted by Correlated Studies of Photoluminescence, Infrared Absorption Spectroscopy and Dielectric Spectroscopy DOI: 10.3390/pharmaceutics14112419 -
Alkyl C-H tillid 1,0
“The comparison purpose , all the FTIR spectra in DHOA system was spectra of pure TBP in MeOH and ACN showed the phosphoryl cm-1, normalized with C-H bending at 1376 which do not shift cm-1, peak at 1258±1 which appeared very close to the ba”
Verma 等 - 2018 - Structural investigations on uranium(VI) and thori DOI: 10.1039/C7NJ04460G. -
Silicon carbon tillid 1,0
“and Si-CH deformation band at 1258 Similarly the intensity of those bands”
Thermal and surface properties of hybrid materials obtained from epoxy-functional urethane and siloxane DOI: 10.1007/s00289-015-1545-7 -
Amide tillid 1,0
“X-ray scatis cm(cid:2)1 C-N bending vibration, the band centered at 1258 to the tering measurements suggest the self-assembling of disordered article cm(cid:2)1 C-O stretching vibration and the sharp band at 1077 to the Article.”
Design of a fluorescent and clickable Ag38(SRN3)24 nanocluster platform: synthesis, modeling and self-assembling DOI: 10.1039/d1na00090j -
Acetate tillid 1,0
“Comparative ATR/FTIR spectra recorded for (a) V1 modified with different metal fillers and (b) V2 modified with different metal fillers However, it should be noted that the addition of metal powders leads to a general change in the shape cm”
Caramitu 等 - 2022 - Physico-chemical Characterization of Paint Films w DOI: 10.37358/Mat.Plast.1964 -
N h tillid 1,0
“1258 This absorption band appears due to CC and CN stretching, NH bending and CH bending vibrations, but also OH deformation and CO stretching vibration interactions.”
Spectroscopic Investigations of Porphyrin-TiO2 Nanoparticles Complexes DOI: 10.3390/molecules28010318 -
Amide tillid 1,0
“cm-1 ν(CN) δ(NH) The vibrations at 1258 correspond to amide III, and are attributed to and from the”
Drobota 等 - 2020 - Preparation and Characterization of Electrospun Co DOI: 10.3390/ma13183961
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