What absorbs at 738 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 738 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 7 cited sources
Quick answer
A band near 738 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 |
|---|---|---|---|
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Imide | 1 | 1 | 1,0 |
| Ring structure | 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.
Possible materials
| Material | Supporting peaks | Overlapping groups | Fuentes citadas |
|---|---|---|---|
| polyimide | 738, 1720, 1778 | Carboxyl (COOH), Imide | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
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 738 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literatura detrás de estas asignaciones
-
Ring structure confianza 1,0
“cm-1 cm-1 1487 is corresponds to C C stretching vibration of benzoniod ring, 1302 is cm-1 N bonds of aromatic amines 1236 corresponds to C N due to the stretching of C cm-1 corresponds to C H in plane of aromatic rings stretching of benzoni”
Patil 等 - 2011 - Electrical Conductivity of PolyanilineNiZnO3 Comp DOI: 10.1080/00150193.2011.620836 -
Imide confianza 1,0
“explicit assignment”
Purushothaman 和 Bilal - 2014 - Development and characterization of homo, co and t DOI: 10.1515/polyeng-2013-0167 -
Metal oxygen confianza 1,0
“for zinc cm(cid:1)1 Al-O-P, phosphates,9 particular, the peak at 738 is assigned to bands at and Rotole and Sherwood for model aluminium 811,1025,1060and1070cm(cid:1)1areassignedtoP-O-Pmodes,and 31P phosphates.11,12 The FTIR, XRD and solid-”
Rationalization of the X-ray photoelectron spectroscopy of aluminium phosphates synthesized from different precursors DOI: 10.1039/c9ra08738a -
Alkene (C=C) confianza 1,0
“% 1,2 vinyl isomer = S 910/(S 738+S 910+S 965)×100 (4) As Figure 2 shows the general trend in each graph is a 738, S 965, and S are peak area at 738, 965, and Where S decrease in the peak area and a shift to the lower temperatures”
Ganjali 等 - 2014 - Correlation between Physico-Mechanical and Rheolog DOI: 10.7317/pk.2014.38.4.425 -
Carboxyl (COOH) confianza 1,0
“The absorbance at 1,738 cm-1 (Figure 6B) appeared to correspond to the carboxylic et al., 2013).”
Permeation of Silver Sulfadiazine Into TEMPO-Oxidized Bacterial Cellulose as an Antibacterial Agent DOI: 10.3389/fbioe.2020.616467 -
confianza 0,9
“Explicit assignment to Pine tree sp.”
In-Situ Comparative Study of Eucalyptus, Basil, Cloves, Thyme, Pine Tree, and Tea Tree Essential Oil Biocide Efficacy DOI: 10.3390/mps5030037 -
confianza 0,8
“assigned to Bi2Al4O9”
Zhang 等 - 2013 - Synthesis and Characterization of Bi2Al4O9 Powders DOI: 10.4028/www.scientific.net/AMR.624.34
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