What absorbs at 1772 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 1772 cm⁻¹ puede apuntar a varios grupos funcionales. A continuación se muestran las asignaciones más probables, clasificadas por cuánta evidencia publicada respalda cada una — cada una trazable a literatura (DOI) y validada de forma cruzada con nuestros más de 130,000 espectros de referencia y grafo de conocimiento.
Backed by 8 cited sources
Respuesta rápida
A band near 1772 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
| Grupo funcional | Hechos de respaldo | Fuentes citadas | Confianza máxima |
|---|---|---|---|
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| N h | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Imide | 2 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
La clasificación refleja la evidencia acumulada de la literatura, no una única regla autorizada. Siempre confirme según el contexto de su muestra.
Materiales posibles
| Material | Picos de apoyo | Grupos superpuestos | Fuentes citadas |
|---|---|---|---|
| DNA | 1772, 1712, 1660 | Methacrylate, Acetate | 1 |
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 1772 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
“The cm-1 The absorbance at 1772 peaks founds to the cartensile and impact specimens are prepared as per ASTM cm-1 bonyl group (C O) of PC and peak at 2236 was D-638 and ASTM D-256 specification.”
Compatibilization effect of EVA-g-MAH on mechanical, morphological and rheological properties of recycled PC/ABS blend DOI: 10.1166/mex.2014.1198 -
confianza 1,0
“- - - - O-H asymmetric and symmetric stretching 3293 3356 C-H asymmetric and symmetric stretching 2876 2872 2881 2858 2851 2851 vibration - - - - C=O stretching in aldehydes 1772 1778 - - - - - N-H bending of NH group (scissoring) 1673 2 -”
Sukprasert 等 - 2020 - Synchrotron FTIR Light Reveals Signal Changes of B DOI: 10.1155/2020/6149713 -
Alkyl C-H confianza 1,0
“cm1 cm1 (alone) appeared at 3358 (stretching of N-H bond), 3087 and 3094 (stretching of C-H and O-H cm1 bonds), 1772 and 1662 (stretching of C = C, C = O and C = N bonds and bending of N-H bond) and cm1 1473 and 1364 (stretching and bending”
Ali 等 - 2023 - Nitazoxanide and azithromycin for the early treatm DOI: 10.21203/rs.3.rs-1745239/v1 -
Hydroxyl (O-H) confianza 1,0
“FTIR (KBr, (C=O 3379 (OH stretching), 1772, 1720 (imide I), 1389 (imide II, CN stretching), 722 bending).”
Corrosion Resistance of Mild Steel Coated with Phthalimide-Functionalized Polybenzoxazines DOI: 10.3390/coatings10111114 -
Hydroxyl (O-H) confianza 1,0
“This made apparent that the cm-1 wide band around 3000 (associable to O-H stretching present in all the excipients and cm-1 cm-1, wide band around 3000 cm-1 (associable to O-H stretching present in all the excipients and the APIs) and peaks”
Foschi 等 - 2022 - Advanced Analytical Approach Based on Combination DOI: 10.3390/ph15060763 -
Phosphate (PO4) confianza 1,0
“1670 and a new weak band arising at 1772 The ure 6D, shows the changes to the phosphate-related vibrations”
Spectroscopic Studies on Photoinduced Reactions of the Anticancer Prodrug, trans,trans,trans‐[Pt(N3)2(OH)2(py)2] DOI: 10.1002/chem.201705349 -
Acetate confianza 1,0
“The successful phthaloylation of deacetylated chitosan was confirmed by the appearance of the peaks at 1772.34 cm-1 and 1705.25 cm-1, corresponding to the C=O imide bond of the”
Fabrication of PEGylated Chitosan Nanoparticles Containing Tenofovir Alafenamide: Synthesis and Characterization DOI: 10.3390/molecules27238401 -
confianza 0,7
“Range for C=O in IgG.”
Micro-Fourier-transform infrared reflectance spectroscopy as tool for probing IgG glycosylation in COVID-19 patients DOI: 10.1038/s41598-022-08156-6
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