What absorbs at 1190 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 1190 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 1190 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-O single bond | 6 | 5 | 1,0 |
| Methacrylate | 5 | 4 | 1,0 |
| Acetate | 5 | 4 | 1,0 |
| Methoxy (OCH3) | 5 | 4 | 1,0 |
| C c single bond | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Aromatic ring | 3 | 3 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Nitrogen heterocycle | 2 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Sulfonate | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 0,7 |
| Metal oxygen | 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 |
|---|---|---|---|
| pMMA | 1190, 1722, 1383 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| polypyrrole | 1190, 1700, 400 | Methacrylate, Acetate | 1 |
| PCL | 1190, 1751, 1724 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| polycaprolactone | 1190, 1580, 1751 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| PPy | 1190, 1043, 910 | Methoxy (OCH3), Methacrylate, C-O single bond | 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 1190 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
-
Phosphate (PO4) confianza 1,0
“On the other hand, the stretchH 1190cm(cid:3)1 ing modes of P-O bonds are located above at low pH, The energies associated with the first step, i.e., the one that 1160cm(cid:3)1 OH(cid:3), and above implies the releasing of one or two at hi”
Quantum chemical study on surface complex structures of phosphate on gibbsite DOI: 10.1016/j.saa.2015.03.013 -
Phosphate (PO4) confianza 1,0
“The formation of covalent 1270cm-1, spectra: (PO 2) band near (PO 2) band at P-O-Cu linkages is easier in the polyphosphate glasses as s 1190cm-1, P-O1100cm-1, absorption band near about than in the metaphosphate glasses.”
Shih 等 - 2003 - P-31 MAS-NMR and FTIR analyses on the structure of DOI: 10.1016/S0254-0584(03)00098-1 -
Aromatic ring confianza 1,0
“combination band at 1190 that includes the bending of benzene ring (C-C-H), asymmetrical stretching of thiophene ring a(C-C-C and C-C-S), symmetrical cm-1, stretching of benzene ring s(C-C-C);”
Aguilar-Rodriguez 等 - 2023 - Microanalytical Characterization of an Innovative DOI: 10.3390/molecules28020564 -
Ring structure confianza 1,0
“The band at 1650 cm-1 has been assigned to the carbonyl stretching vibration, a number of skeletal ring vibrations at 1598, 1490 and 1413 cm-1, the asymmetric stretching of ether group at 1277 and 1190 cm-1, the aromatic hydrogen in-plane d”
Mechano-Chemical Properties of Electron Beam Irradiated Polyetheretherketone DOI: 10.3390/polym14153067 -
Sulfonate confianza 1,0
“the peaks at 1190 cm-1 cm-1 and 985 can be assigned to the asymmetric and symmetric stretching of SO 3.”
Anis 等 - 2023 - Studies on Polybenzimidazole and Methanesulfonate DOI: 10.3390/polym15132821 -
confianza 1,0
“cm-1, to 1550 or even 1570 the pyrrole ring C-N stretching band formed a maximum cm-1, cm-1, at 1475 C-H or C-N in the in-plane deformation band shifted to 1320 the cm-1, N-H+ pyrrole ring breathing band shifted to 1190 the deformation shif”
Polypyrrole Aerogels: Efficient Adsorbents of Cr(VI) Ions from Aqueous Solutions DOI: 10.3390/gels9070582 -
Aromatic ring confianza 1,0
“A peak appears at about 1190 showing that the aromatic structure of lignin has”
Castro 等 - 2020 - Pretreatment Affects Activated Carbon from Piassav DOI: 10.3390/polym12071483 -
confianza 1,0
“cm-1, C=O (symmetric), stretching at 1721 at 2866 cm-1, C-O-C stretching C-C and C-O stretching at 1721 cm-1, cm-1 and O-C-O stretching at 1190 [4,23].”
Preparation of electrospun polycaprolactone nanofiber mats loaded with microalgal extracts DOI: 10.1002/elsc.201900009
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