What absorbs at 1355 cm⁻¹ in an FTIR spectrum?
A band near 1355 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
Răspuns rapid
A band near 1355 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.
Atribuiri posibile ale grupelor funcționale
| Grup funcțional | Fapte suport | Surse citate | Încredere maximă |
|---|---|---|---|
| Alkyl C-H | 5 | 5 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| C n single bond | 3 | 3 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Nitrate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 0,9 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
Materiale posibile
| Material | Vârfuri suport | Grupuri suprapuse | Surse citate |
|---|---|---|---|
| lignin | 1355, 1035, 1510 | Alkyl C-H | 1 |
| wood | 1355, 1740, 1730 | Alkyl C-H | 1 |
| PET | 1355, 1408, 800 | Alkyl C-H, Amide | 1 |
| chitosan | 1355, 1650, 1655 | Alkyl C-H, Amide | 1 |
Materialele sunt afișate numai atunci când același grup de literatură susține această bandă și cel puțin un vârf caracteristic suplimentar.
Logica spectrului
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 1355 cm⁻¹ is usually not enough for material identification by itself.
Utilizare în condiții reale
Acest tip de interogare este comun în identificarea polimerilor, screeningul materialelor plastice necunoscute, depanarea QC, verificarea materialelor reciclate și revizuirea atribuirii vârfurilor bazată pe literatură.
Greșeli comune
- Tratarea unei benzi izolate ca dovadă a unui material fără a verifica cel puțin unul sau două vârfuri de susținere.
- Ignorând suprapunerea: mai multe grupuri funcționale pot contribui în apropierea aceluiași număr de undă.
- Omiterea validării atunci când aditivii, amestecurile, oxidarea sau contaminarea pot distorsiona spectrul.
Sfat de verificare
Când ambiguitatea rămâne, validați ipoteza prin DSC, GC-MS sau TGA, în special pentru amestecuri, probe degradate și polimeri umpluți.
Literatura din spatele acestor atribuiri
-
Acetate încredere 1,0
“(1355 and C-O stretching (1249 It is noted that, the intensity of C-H and C-O-H bending significantly increased from 3.8% to 20.0% as presented in Fig.”
Solid polymer electrolyte production from 2-hydroxyethyl cellulose: Effect of NH4NO3 composition on its structural properties DOI: 10.1016/j.carbpol.2017.02.033 -
Nitrate încredere 1,0
“Furthermore, the sharp band at 1355 cm(cid:2)1 to the stretching vibrations of the Schiff base groups comindicates the presence of the other nitrate group”
Przybylski 等 - 2008 - ESI MS, spectroscopic and semiempirical characteri DOI: 10.1016/j.molstruc.2007.07.039 -
Alkyl C-H încredere 1,0
“On the other hand, the peak at 1355 was the combination peak of symmetry NO 2, C = O stretching, CH deformation and C-N stretching vibration.”
Synthesis and characterizations of o-nitrochitosan based biopolymer electrolyte for electrochemical devices DOI: 10.1371/journal.pone.0212066 -
Acetate încredere 1,0
“a new band at 1355 cm-1 between the previous occurred and was assigned to wood constituents (-CH 3 fromlignin/hemicellulose/polysaccharide-OH).Theseresultsindicatepossiblechemical interactions between rubber, PET, HDPE, wood, and FA compoun”
The Influence of Fly Ash on the Mechanical Properties of Water Immersed All Waste Composites DOI: 10.3390/polym14101957 -
Alkyl C-H încredere 1,0
“Furthermore, small symmetric stretching bands of formate species can be detected at 1355 cm-1, and the corresponding δ (CH) at 1375 cm-1 [88,89].”
CO2 Methanation over Nickel Catalysts: Support Effects Investigated through Specific Activity and Operando IR Spectroscopy Measurements DOI: 10.3390/catal13020448 -
Alkyl C-H încredere 1,0
“The band derived from the -C-H bond at a wavenumber of 1355 cm-1 also slightly changes.”
Preparation and Characterization of Indomethacin Supramolecular Systems with -Cyclodextrin in Order to Estimate Photostability Improvement DOI: 10.3390/molecules26247436 -
încredere 1,0
“Moreover, asymmetric S O stretching 2 cm-1, cm-1, = at 1355 and symmetric S O stretching at 1177 were observed in the FTIR spectra 2 of tosylated cellulose, which confirmed the tosylation reaction.”
A Composite Anion Conducting Membrane Based on Quaternized Cellulose and Poly(Phenylene Oxide) for Alkaline Fuel Cell Applications DOI: 10.3390/polym12112676 -
C c single bond încredere 1,0
“FTIR peaks at 1355, 1039, 1034, 1023, 1001, 999 C-C-Cinplanebend cm(cid:1)1 151 510.1825 492.8 120.4 & are indicative of this.”
Computational and spectral studies of 3,3'-(propane-1,3-diyl)bis(7,8-dimethoxy-1,3,4,5-tetrahydro-2H-benzo[d]azepin-2-one) DOI: 10.1016/j.heliyon.2019.e02420
Aveți un spectru cu această bandă?
Încărcați spectrul FTIR și obțineți un raport complet de interpretare — atribuiri de peak-uri cu citări din literatură, potriviri cu biblioteca și un lanț de dovezi cu nivel de încredere — în câteva secunde.