What absorbs at 955 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 955 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 955 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 8 | 8 | 1,0 |
| Silicon (Si) | 8 | 7 | 1,0 |
| Hydroxyl (O-H) | 6 | 5 | 1,0 |
| Silanol (Si-OH) | 4 | 4 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 2 | 1,0 |
| Methacrylate | 3 | 2 | 1,0 |
| C-O single bond | 3 | 2 | 1,0 |
| Acetate | 3 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 0 | 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 |
|---|---|---|---|
| silica | 955, 1100, 1080 | Silicon-oxygen (Si-O), Silicon (Si), Hydroxyl (O-H) | 2 |
| MWCNT | 955, 2876, 1430 | Hydroxyl (O-H) | 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 955 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
-
Alkene (C=C) confianza 1,0
“cm-1 The characteristic bands at 955, 773 and 620 are assigned to C=C in-plane bending and C-H”
Highly Biological Active Antibiofilm, Anticancer and Osteoblast Adhesion Efficacy from MWCNT/PPy/Pd nanocomposite DOI: 10.1016/j.apsusc.2017.10.142 -
confianza 1,0
“A weak andbroadbandat955cm-1 hybridized S 3p states into the 3d states of the ferric iron (Okude wasassignedto waterlibrationalmodes et al., 1999).”
Vibrational, X-ray absorption, and Mössbauer spectra of sulfate minerals from the weathered massive sulfide deposit at Iron Mountain, California DOI: 10.1016/j.chemgeo.2011.03.008 -
C c single bond confianza 1,0
“response of DNA in the control cells is charac- (PO terized by the components at ~1236 cm-1 2antisymmetric stretching), 1170 cm-1 (sugarphosphate backbone vibration), 1083 cm-1 (PO symmetric stretching), and 966 cm-1with 2- (C-C stretching”
Ami 等 - 2014 - Role of water in chromosome spreading and swelling DOI: 10.4081/ejh.2014.2330 -
C-O single bond confianza 1,0
“Moreover, three peaks generally observed cm-1, cm-1 cm-1, alkoxy-derived silica gels are visible at 1385 cm-1, 955 cm-1 and at 570 cm-1, which are due to residual in alkoxy-derived silica gels are visible at 1385 955 and at 570 which are du”
Synthesis of Bioactive Chlorogenic Acid-Silica Hybrid Materials via the Sol–Gel Route and Evaluation of Their Biocompatibility DOI: 10.3390/ma10070840 -
Silicon (Si) confianza 1,0
“The polymer cm-1, cm-1 vibration appeared unmodified at 1728 whereas silica bands at 1080 and 460 CO stretching vibration appeared unmodified at 1728 cm-1, whereas silica bands at 1080 cm-1 due to stretching and bending of Si-O-Si, as well”
Antibacterial and Cytotoxic Silica-Polycaprolactone- Chlorogenic Acid Hybrids by Sol–Gel Route DOI: 10.3390/molecules28083486 -
confianza 1,0
“The bands at 955 cm-1 cm-1 (S-1) and 966 (S-28) belong to Si-O lattice vibrations, while the bans at 878 (S-1)”
Colovic 等 - 2013 - Creating of Highly Active Calcium-Silicate Phases DOI: 10.2298/SOS1303341C -
Silicon (Si) confianza 1,0
“Bands around 955 may also act as an indicator for specific surface area (SSA) as they are attributed to the asymmetric vibration of Si-OH.”
Comparing amorphous silica, short-range-ordered silicates and silicic acid species by FTIR DOI: 10.1038/s41598-022-15882-4 -
Acetate confianza 1,0
“→ 03 Stretching of CH 2881 2877 and stretching of C-COO 955 04 Rocking of CH3 Rocking of CH3 and stretching of C-COO and characteristic peak 05 908”
Effects of Amphiphilic Chitosan on Stereocomplexation and Properties of Poly(lactic acid) Nano-biocomposite DOI: 10.1038/s41598-018-22281-1
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