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

Respuesta rápida

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.

Posibles asignaciones de grupos funcionales

La clasificación refleja la evidencia acumulada de la literatura, no una única regla autorizada. Siempre confirme según el contexto de su muestra.

Materiales posibles

Los materiales se muestran solo cuando el mismo grupo de literatura respalda esta banda y al menos un pico característico adicional.

Lógica de espectro

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.

Uso en el mundo real

Este tipo de consulta es común en la identificación de polímeros, cribado de plásticos desconocidos, resolución de problemas de control de calidad, verificación de materiales reciclados y revisión de asignación de picos respaldada por la literatura.

Errores comunes

• Tratar una banda aislada como prueba de un material sin verificar al menos uno o dos picos de apoyo.
• Ignorando superposición: múltiples grupos funcionales pueden contribuir cerca del mismo número de onda.
• Omitir la validación cuando los aditivos, las mezclas, la oxidación o la contaminación puedan distorsionar el espectro.

Consejo de verificación

Cuando persista la ambigüedad, valide la hipótesis con DSC, GC-MS o TGA, especialmente para mezclas, muestras degradadas y polímeros rellenos.

Literatura detrás de estas asignaciones

• Acetate confianza 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) confianza 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 confianza 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 confianza 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 confianza 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) confianza 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
• confianza 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 confianza 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