What absorbs at 969 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 969 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 969 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 |
|---|---|---|---|
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Nucleic acid | 2 | 1 | 1,0 |
| Alkyl C-H | 2 | 1 | 1,0 |
| Silanol (Si-OH) | 2 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Bromine | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Silicate | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 0 | 1,0 |
| Hydroxyl (O-H) | 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.
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 969 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
-
Alkyl C-H confianza 1,0
“The peak at 969 assigned to trans -CH=CHbending vibration from 219 phospholipid among different animal species (Che Man, Z.”
Gao 等 - 2021 - Complementarity of FT-IR and Raman spectroscopies DOI: 10.1016/j.foodchem.2020.128754 -
Silicon (Si) confianza 1,0
“The absorption band at 953 and is designated to the stretching 857cm-1 frequency of Sr-O bond and Si-O stretching frequency appears at in the prepared silicate materials is due to the asymmetric 969cm-1 stretching frequency of Si-O bond in”
Down-conversion characteristics of Eu3+ doped M2Y2Si2O9 (M = Ba, Ca, Mg and Sr) nanomaterials for innovative solar panels DOI: 10.1016/j.pnsc.2019.07.003 -
Acetate confianza 1,0
“This is the case of the bands at 1208 and 1126 cm-1 (νas C-O-C, ring), and 1024 and 969 cm-1 (ν C-O, C-C) in the α-ring, respectively.”
Optimization and Characterization of a Novel Exopolysaccharide from Bacillus haynesii CamB6 for Food Applications DOI: 10.3390/biom12060834 -
C c single bond confianza 1,0
“The values cm-1(esterC-O-C g-1) DH (lactoneC-O-Casymmetricbend),1214 of the eutectic melting enthalpy (J for a given cm-1 asymmetric bend), 1074 (lactone C-C symmetric dispersions, determined by integration of the eutectic peak cm-1(esterC-”
Gorniak 等 - 2016 - Thermal, spectroscopic and dissolution studies of DOI: 10.1007/s10973-016-5279-z -
Nucleic acid confianza 1,0
“cm21 cm21 band at 969 and 935 are assigned to DNA backbone”
Jangir 等 - 2013 - Role of Minor Groove Width and Hydration Pattern o DOI: 10.1371/journal.pone.0069933 -
Bromine confianza 1,0
“cm-1 cm-1 The negative band at 976 and the positive band at 969 in Figure 9b were assigned to the cm-1 N-D in-plane bending vibrations of BR and BR K, respectively [34].”
Kawanabe 和 Kandori - 2009 - Photoreactions and Structural Changes of Anabaena DOI: 10.3390/s91209741 -
Amide confianza 1,0
“cm-1, grown MAPbBr single crystal is consistent with Prominent peaks are at 969 3 cm-1, cm-1, cm-1, 1477 1584 and 3165 which can be attributed to the C-N stretch, symmetric 5 3+”
Origin of Defects and Positron Annihilation in Hybrid and All-Inorganic Perovskites DOI: 10.1021/acs.chemmater.1c03540 -
Acetate confianza 1,0
“Candida krusei Candida glabrata Candida parapsilosis Candida albicans Species and and Preparation Prominent Bands in PC2 Loadings Plots (cm-1) (νC-O) 1166-C-O stretch of Method Carbohydrates-Polysaccharides Candida krusei and Candida Specie”
Influence of the Sample Preparation Method in Discriminating Candida spp. Using ATR-FTIR Spectroscopy DOI: 10.3390/molecules25071551
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