What absorbs at 783 cm⁻¹ in an FTIR spectrum?
A band near 783 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Schnelle Antwort
A band near 783 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.
Mögliche Funktionsgruppenzuweisungen
| Funktionelle Gruppe | Unterstützende Fakten | Zitierte Quellen | Höchstes Vertrauen |
|---|---|---|---|
| Metal oxygen | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 1 | 1,0 |
| Metal oxo | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Metalloid oxygen | 1 | 1 | 0,8 |
Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.
Mögliche Materialien
| Material | Unterstützende Peaks | Überlappende Gruppen | Zitierte Quellen |
|---|---|---|---|
| MWCNT | 783, 2876, 1430 | Alkyl C-H | 1 |
| TiO2 | 783, 1700, 1093 | Metal oxygen, Alkyl C-H | 1 |
Materialien werden nur angezeigt, wenn derselbe Literaturpool diese Bande und mindestens einen weiteren charakteristischen Peak unterstützt.
Spektrumslogik
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 783 cm⁻¹ is usually not enough for material identification by itself.
Praktische Anwendung
Diese Art von Abfrage ist üblich bei der Polymeridentifikation, dem Screening unbekannter Kunststoffe, der Fehlersuche in der Qualitätskontrolle, der Verifizierung von Recyclingmaterial und der literaturgestützten Überprüfung der Peakzuordnung.
Häufige Fehler
- Behandlung einer isolierten Bande als Beweis für ein Material, ohne mindestens einen oder zwei unterstützende Peaks zu überprüfen.
- Überlappung ignorieren: Mehrere funktionelle Gruppen können nahe der gleichen Wellenzahl beitragen.
- Überspringen der Validierung, wenn Additive, Mischungen, Oxidation oder Verunreinigungen das Spektrum verfälschen können.
Beratung zur Verifizierung
Wenn weiterhin Mehrdeutigkeit besteht, validieren Sie die Hypothese mit DSC, GC-MS oder TGA, insbesondere bei Mischungen, degradierten Proben und gefüllten Polymeren.
Literatur hinter diesen Zuweisungen
-
Amide Vertrauen 1,0
“the FTIR spectra of as prepared PPy showed the important characteristic cm-1, peaks at 783 which corresponds C-N vibration.”
Highly Biological Active Antibiofilm, Anticancer and Osteoblast Adhesion Efficacy from MWCNT/PPy/Pd nanocomposite DOI: 10.1016/j.apsusc.2017.10.142 -
Vertrauen 1,0
“Furthermore, and 783 cm-1, which have been assigned to Ti-O-Ti vibrations [34,35].”
Enhancing Free Cyanide Photocatalytic Oxidation by rGO/TiO2 P25 Composites DOI: 10.3390/ma15155284 -
N h Vertrauen 1,0
“The FTIR of LX (pure drug) shown intense bands at 3060 cm-1, 1647 cm-1, 1590 cm-1, cm-1, cm-1 1590 1323 and 783 corresponding to the functional groups NH, C=O, cm-1, 1323 cm-1, and 783 cm-1 corresponding to the functional groups NH, C=O, CO”
Almotairi 等 - 2022 - Design and Optimization of Lornoxicam Dispersible DOI: 10.3390/ph15121463 -
Alkene (C=C) Vertrauen 1,0
“Peak at 783.4 indicates treatment with US and O3 C-- To estimate cumulative biogas production, many studies have the presence of alkene compounds and C bending.”
Enhancement of biogas production from individually or co-digested green algae Cheatomorpha linum using ultrasound and ozonation treated biochar DOI: 10.1016/j.ultsonch.2022.106197 -
Hydroxyl (O-H) Vertrauen 1,0
“cm-1 cm-1 cm-1 3296 (OH vibration), 2947 (asymmetrical CH stretching vibration), 2875 shifted slightly to 1110, 993 and 783 cm-1, respectively.”
Morphology and Selected Properties of Modified Potato Thermoplastic Starch DOI: 10.3390/polym15071762 -
Nucleic acid Vertrauen 1,0
“In particular, a decrease in Raman bands related to nucleic acids (1484, 783 cm-1) in the log phase compared to lag phase was observed [25].”
Kochan 等 - 2020 - Vibrational Spectroscopy as a Sensitive Probe for DOI: 10.3390/s20123452 -
Vertrauen 1,0
“The bands at ~3550, (C=O 3406 (OH stretching vibration), and additionally 1113 and 668 cm-1 (S-O stretching and bending, respectively) indicated the presence of gypsum, whereas the bands at 1640, 1325 stretching cm-1 respectively) indicated”
Investigating the Potential of the Er:YAG Laser for the Removal of Cemented Dust from Limestone and Painted Plaster DOI: 10.3390/coatings10111099 -
Vertrauen 1,0
“30 cm(cid:0) 1, Al(cid:0) OH stretching and bending of tetrahedral 1120 31 Al(cid:0) aluminum is observed, respectively, while O stretching of 32 octahedral aluminum is assigned to the bands at 783 and”
Synthesis and Characterization of Ru‐Loaded Anodized Aluminum Oxide for Hydrogenation Catalysis DOI: 10.1002/open.201900091
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