What absorbs at 1444 cm⁻¹ in an FTIR spectrum?

Răspuns rapid

A band near 1444 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

Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.

Materiale posibile

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 1444 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

  “and modest C-O-H bending at 1444 C-O stretching, C-O bending, C-H bending, cm-1, and Fe-O bonds all had strong appearances at 1244, 1016, 632, and 576 respectively.”

  Molecularly Targeted Photothermal Ablation of Epidermal Growth Factor Receptor-Expressing Cancer Cells with a Polypyrrole–Iron Oxide–Afatinib Nanocomposite DOI: 10.3390/cancers14205043
• Hydroxyl (O-H) încredere 1,0

  “The signal 1531, 1516, and 1444 cm-1 to the cm(cid:0) 1 O-H as 1376 cm-1 was ascribed to stretching, the peak at 1224 cm(cid:0) 1 C-OH 2.3.”

  Characterization of the medium infrared spectra of polyphenols of red and white wines by integrating FT IR and UV–Vis spectral data DOI: 10.1016/j.lwt.2021.111604
• Alkyl C-H încredere 1,0

  “The band at 1444 is cm-1, due to the asymmetric C-H deformation, aryl ring breathing at 1260 and aromatic cm-1.”

  HPTLC and FTIR Fingerprinting of Olive Leaves Extracts and ATR-FTIR Characterisation of Major Flavonoids and Polyphenolics DOI: 10.3390/molecules26226892
• Amide încredere 1,0

  “cm-1 [ν(N-H)], to the stretching vibration the band at 1637 cm-1 CO [ν(CO)], stretching vibration the band at 1569 to the quinonoid ring-stretching vibration, the bands at 1505 cm-1 to the benzenoid ring-stretching vibrations, the and 149”

  Blaha 等 - 2019 - Role of p-Benzoquinone in the Synthesis of a Condu DOI: 10.1021/acsomega.9b00542
• Alkyl C-H încredere 1,0

  “cm-1, t Aromatic ring C=C-C stretching vibrations located at 1594 aliphatic C-H cm-1, stretching vibrations arises at 2945 and C-H bending vibration appears at 1444 and cm-1.5,39,40 cm-1 1375 The FTIR spectra of ADP showed C=O stretching vi”

  Polymer-Assisted Aripiprazole-Adipic Acid Cocrystals Produced by Hot Melt Extrusion Techniques DOI: 10.1021/acs.cgd.0c00020.
• Hydroxyl (O-H) încredere 1,0

  “Added to this, there are other cm-1 1444, 1639, 2938, 3323, and 3450 that can be associated with the OH vibrations present bands at 1444, 1639, 2938, 3323, and 3450 cm-1 that can be associated with the OH vibracm-1 bands at 1444, 1639, 2938”

  Physical-Mechanical Behavior and Water-Barrier Properties of Biopolymers-Clay Nanocomposites DOI: 10.3390/molecules26216734
• încredere 1,0

  “9/21/2023 3.0 cm(cid:3)1 molecule.61 chain of the pyridine The bands in the 1444 Attribution region are assigned to the pyridine molecules interacting by sites.62 coordination with the Lewis acid on XRD patterns for H-Y(80) zeolite.”

  Dal Pozzo 等 - 2019 - Free fatty acids esterification catalyzed by acid DOI: 10.1039/c8ra10248a
• Acetate încredere 1,0

  “On the other hand, CaO cm-1, cm-1, cm-1 nanoparticles showed peaks at 1444.42 1064.51 and 863.95 which were ascribed to C-O bond indicating the carbonation of calcium oxide nanoparticles [18,24].”

  Habte 等 - 2019 - Synthesis of Nano-Calcium Oxide from Waste Eggshel DOI: 10.3390/su11113196