What absorbs at 1004 cm⁻¹ in an FTIR spectrum?
A band near 1004 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
Quick answer
A band near 1004 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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 4 | 2 | 1,0 |
| Silicon (Si) | 3 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 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 |
| Amino acid | 1 | 1 | 1,0 |
| S eq o | 1 | 0 | 1,0 |
| Sulfonyl | 1 | 0 | 1,0 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Possible materials
| Material | Stödjande toppar | Overlapping groups | Citerade källor |
|---|---|---|---|
| kaolinite | 1004, 3696, 693 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 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 1004 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.
Litteratur bakom dessa identifieringar
-
Amino acid förtroende 1,0
“LLM confirmed rule peak-group candidate”
Ngarize 等 - 2005 - A comparative study of heat and high pressure indu DOI: 10.1016/j.foodhyd.2004.12.008 -
Silicon (Si) förtroende 1,0
“cm-1 cm-1 The moderately strong broad band at 1033 and the strong sharp band at 1004 correlated to the antisymmetric and symmetric stretching modes of Si-O-Si, respectively [20].”
Souissi 等 - 2022 - Synthesis, Thermal Properties and Electrical Condu DOI: 10.21203/rs.3.rs-1294285/v1 -
Phosphate (PO4) förtroende 1,0
“Moreover, the evident sharp absorption peak at 1004 is ascribed to the symmetrical stretching of PO 2”
Dai 等 - 2020 - Effects of a Reactive Phosphorus-Sulfur Containing DOI: 10.3390/polym12071441 -
Acetate förtroende 1,0
“cm-1 cm-1 cm-1 1256 (amide III vibration modes), 1163 and 1062 (C-O-C bridge stretching), cm-1 cm-1 1004 and 968 (C-O stretching vibration in secondary and primary OH groups).”
Physicochemical Properties and Functional Characteristics of Ecologically Extracted Shrimp Chitosans with Different Organic Acids during Demineralization Step DOI: 10.3390/molecules27238285 -
Silicon (Si) förtroende 1,0
“cm-1 appeared at 2921.4 and The band at 1003.5 is assigned to Si-O bond.”
Liu 等 - 2014 - NIR initiated and pH sensitive single-wall carbon DOI: 10.1039/C3TB21362E. -
Hydroxyl (O-H) förtroende 1,0
“cm-1 At 1004 attributed to stretching, OH coupled with bending CO of capsule and pneumoniaeCol-S K.”
Evaluation of Chemical Changes in Laboratory-Induced Colistin-Resistant Klebsiella pneumoniae DOI: 10.3390/ijms22137104 -
Ring structure förtroende 1,0
“For all cm-1 of the samples, the narrow band near 1004 corresponded to the ring vibration of Phe”
Ex Vivo Vibration Spectroscopic Analysis of Colorectal Polyps for the Early Diagnosis of Colorectal Carcinoma DOI: 10.3390/diagnostics11112048 -
Phosphate (PO4) förtroende 1,0
“The 1004 peak representing ferric phosphate still unreacted rust.”
Rust Conversion Performance of Phosphoric Acid-Gallic Acid in Vinyl Chloride Acrylic Emulsion DOI: 10.3390/coatings11020152
Har du ett spektrum med detta band?
Ladda upp ditt FTIR-spektrum och få en fullständig tolkningsrapport – toppidentifieringar med litteraturhänvisningar, biblioteksmatchningar och en förtroendebedömd beviskedja – på sekunder.