What absorbs at 934 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 934 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 934 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 |
|---|---|---|---|
| C c single bond | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Fluorine (C-F) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Protein alpha helix | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Silicate | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 0,9 |
| Perchlorate | 1 | 1 | 0,7 |
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 |
|---|---|---|---|
| HCl | 934, 1708, 1032 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| polyvinylpyrrolidone | 934, 1660, 1700 | Methacrylate, Acetate | 1 |
| DNA | 934, 1712, 1660 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| PVP | 934, 2983, 1648 | 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 934 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
-
confianza 1,0
“The higher-intensity peak of 934.44 eV is attributed to Cu (II) species shown”
Ibrahim 等 - 2023 - Role of ammonium phosphate in improving the physic DOI: 10.37190/ppmp/161510 -
Acetate confianza 1,0
“The peak at 933.59 denotes vibrations from C-O stretching [43].”
Mahardiani 等 - 2022 - Nanofiber Fabrication from Palm Fiber Waste for Su DOI: 10.48317/IMIST.PRSM/morjchem-v10i2.32648 -
Silicon (Si) confianza 1,0
“cm-1 The intense peak located at 934 corresponds to asymmetric stretching of Si-O-Si bonds.”
Structural and optical properties of green emitting Y2SiO5:Tb3+ and Gd2SiO5:Tb3+ nanoparticles for modern lighting applications DOI: 10.1007/s12598-020-01585-0 -
confianza 1,0
“The ν(C-F) shows two bands at ~934 and 990 cm-1, the latter resulting from Assignment A Conformation B Conformation vibrations characteristic of the pentafluorobenzoate group.”
The Application of ATR-FTIR Spectroscopy and the Reversible DNA Conformation as a Sensor to Test the Effectiveness of Platinum(II) Anticancer Drugs DOI: 10.3390/s18124297 -
C c single bond confianza 1,0
“The peak at 758 800 (cid:3)C for all the PVP amount exhibit and also is assigned to the C-C an unreacted ZnO phase at the peak position of ring vibration, while the peak at 934 is due to C-C ring 2h = 36.40(cid:3) which corresponds to the 0”
Alibe 等 - 2019 - Effects of polyvinylpyrrolidone on structural and DOI: 10.1007/s10973-018-7874-7 -
Silicate confianza 1,0
“this peak was attributed to the reduction of Cu0/Cu1+ main peaks located at 933.5 eV and 935.8 eV, attributed to the presence of and Ni2+ in nickel silicate [36].”
Enhanced Cyclopentanone Yield from Furfural Hydrogenation: Promotional Effect of Surface Silanols on Ni-Cu/m-Silica Catalyst DOI: 10.3390/catal13030580 -
Alkyl C-H confianza 1,0
“The β(C-H) vibrations of the bonded modulator gave rise to peaks at 1072 and 934 cm-1 [48].”
Butova 等 - 2023 - In Situ FTIR Spectroscopy for Scanning Accessible DOI: 10.3390/nano13101675 -
Acetate confianza 1,0
“FTIR spectra 1600 (typical aromatic skeletal vibration), 1491 (disubstituted benzene ring), 1222 (antisymmetric C-O-C stretching vibration), 934 (O-C vibration 2 in the oxazine ring with a minor contribution from the phenolic ring), 753 (Ar”
Developing Further Versatility in Benzoxazine Synthesis via Hydrolytic Ring-Opening DOI: 10.3390/polym12030694
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