What absorbs at 2550 cm⁻¹ in an FTIR spectrum?
A band near 2550 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 2550 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 |
|---|---|---|---|
| Thiol | 7 | 5 | 1,0 |
| Hydroxyl (O-H) | 4 | 3 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Nitrile | 1 | 1 | 1,0 |
| S s | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Silicon hydride | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Sulfur | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Amino acid | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
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 |
|---|---|---|---|
| ZnO | 2550, 1400, 3430 | Hydroxyl (O-H), Alkyl C-H | 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 2550 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
-
Hydroxyl (O-H) încredere 1,0
“There is no evidence of O-H stretching at 2550”
Structural and magnetic properties of Co-doped ZnO thin films grown by ultrasonic spray pyrolysis method DOI: 10.1016/j.spmi.2016.11.069 -
Hydroxyl (O-H) încredere 1,0
“There is no evidence of O-H stretching at nanostructured thin films with Mn-doping contents: (a) 2550cm-1 1650-1750cm-1, and O-H about suggesting that 1at% and (b) 3at%.”
Kharroubi 等 - 2012 - Mn doping effect on the structural properties of Z DOI: 10.1088/0031-8949/86/01/015805 -
încredere 1,0
“Then, the removal of the isolated hydroxyls on the including a wavelength of 580-2000 nm, the intensities of the cm-1 Fe peaks at 2550 and 2650 were decreased, but these were 2O under the light (200-2000 nm) irradiation was 3 remained after”
Tanaka 等 - 2005 - FT-IR study on behavior of surface hydroxyls under DOI: 10.13182/FST05-A917 -
încredere 1,0
“The weak bands cm-1 at 2550, 1716-1710, and 1595-1510 are associated with the stretching vibrations of cm-1 diverse amino acid residues [52,53].”
New Insights into the Medieval Hispano-Muslim Panel Painting: The Alfarje Found in a Balearic Casal (Spain) DOI: 10.3390/molecules28031235 -
Thiol încredere 1,0
“On the cm-1 other hand, the absence of the strong S-H stretching vibration of L-Cys at around 2550 in CAE-AgNPs”
Bioinspired 5-caffeoylquinic acid capped silver nanoparticles using Coffee arabica leaf extract for high-sensitive cysteine detection DOI: 10.1038/s41598-023-34944-9 -
Phosphate (PO4) încredere 1,0
“The bands for N-H appear at 1625 and 3410 The absence of the band at cm-1 2550 pointed to a binding mode mostly through P-O-Fe bonds to the iron surface.”
Maranescu 等 - 2018 - The corrosion inhibitor behavior of iron in saline DOI: 10.1515/pac-2018-0513 -
Silicon hydride încredere 1,0
“According thesized by method 1, in the reaction with an equimolar to elemental analysis, potassium cyclotetrasiloxanolates amount of potassium hydroxide, displayed all bands characcm-1 ([KOH]/[silane]=1) (νCH 2), contain both water and etha”
Nowacka 等 - 2015 - Alkali-Metal-Directed Hydrolytic Condensation of 3 DOI: 10.1007/s12633-014-9249-4 -
S s încredere 1,0
“It is worth indicating that around Furthermore, the presence of the disulfide in 3DPDS-fa and 4DPDS-fa was confirmed 2% of the S-S bonds of 4DPDS-fa cleaved, as shown by the small peak located between 2550”
Trejo-Machin 等 - 2021 - Synthesis of Novel Benzoxazines Containing Sulfur DOI: 10.3390/polym13081262
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.