What absorbs at 980 cm⁻¹ in an FTIR spectrum?
A band near 980 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 980 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 12 | 12 | 1,0 |
| Silicon (Si) | 6 | 6 | 1,0 |
| C-O single bond | 6 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 2 | 1,0 |
| Methacrylate | 4 | 2 | 1,0 |
| Acetate | 4 | 2 | 1,0 |
| Phosphate (PO4) | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| Thiol | 2 | 2 | 1,0 |
| C-S single bond | 2 | 2 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Silicon nitrogen | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Silicon silicon | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 0,95 |
| Carbonyl (C=O) | 1 | 0 | 1,0 |
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 |
|---|---|---|---|
| calcium carbonate | 980, 3232, 2954 | Silicon-oxygen (Si-O), C-O single bond, Methoxy (OCH3) | 1 |
| olivine | 980, 3525, 3564 | Silicon (Si) | 1 |
| zirconia | 980, 1100, 460 | Silicon-oxygen (Si-O) | 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 980 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
-
C-S single bond Vertrauen 1,0
“The appearance of new peaks around 975-985 and Accepted 1 May 2011 of cement paste has been attributed to the formation of two principal hydration products (C-S-H) and Available online 13 May 2011 2,respectively.Thereisastrongresemblanceofp”
Theoretical and experimental study of structures and properties of cement paste The nanostructural aspects of C–S–H DOI: 10.1016/j.jpcs.2011.05.001 -
Silicon silicon Vertrauen 1,0
“7 (a) Typical absorption, transmission and reflection spectra of cm(cid:3)1 for 30and 60-s Si-Si peaks are at 979.56 and 943.58 vertical SiNWs by electroless process.”
Synthesis and Characterization of Silicon Nanowires by Electroless Etching DOI: 10.1007/s11665-018-3179-z -
Vertrauen 1,0
“The broad absorption at 980 In the present study, quantitative analysis by FTIR cm(cid:2)1 is assigned to the symmetric and asymmetric S-O”
Boke 等 - 2004 - Quantification of CaCO3-CaSO3 center dot 0.5H(2)O- DOI: 10.1016/j.matlet.2003.07.008 -
Vertrauen 1,0
“A small exothermic peak around 980 °C corresponds to α-Al 2O transformation.”
Chandradass 和 Kim - 2009 - Effect of acidity on the citrate-nitrate combustio DOI: 10.1007/s12540-009-1039-y -
N-O bond Vertrauen 1,0
“The strongly shocked olivine with 80Fo% A.Kereszturietal./SpectrochimicaActaPartA:MolecularandBiomolecularSpectroscopy173(2017)637-646 640 cm-1 cm-1) cm-1 shocked olivines have no peaks above 980 and below 830 shifted with values between +1”
Analyzing Raman - Infrared spectral correlation in the recently found meteorite Csátalja DOI: 10.1016/j.saa.2016.10.012 -
S eq o Vertrauen 1,0
“This is the first time a PhysicalChemistryChemicalPhysicsAcceptedManuscript ethoxyethane) sulfonic acid or Aquivion®, with only one ether variable temperature IR study of Nafion thin films is being cm-1 group near the sulfonic acid did not”
Kollath 和 Karan - 2016 - New molecular scale insights into the alpha-transi DOI: 10.1039/C6CP04457C. -
Phosphate (PO4) Vertrauen 1,0
“cm-1 After phosphorylation process, a new peak at wavelength 980 observed which related cm-1 to P-O bond [18] and intense peak at wavelength 1226 due to P=O bond in accordance”
Synthesis, Characterization, and Performance of Graphene Oxide and Phosphorylated Graphene Oxide as Additive in Water-Based Drilling Fluids DOI: 10.1016/j.apsusc.2019.145005 -
C-O single bond Vertrauen 1,0
“If Glyoxal oligomer peaks at 1070 950 and 980 cm-1 C-OH both glyoxal monomers are singly hydrated at the outset, a are assigned to free stretch, dioxolane-linked dioxolane ring can be formed through a second, intramoC-OCasymmetricstretch,an”
Loeffler 等 - 2006 - Oligomer formation in evaporating aqueous glyoxal DOI: 10.1021/es060810wCCC
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