What absorbs at 703 cm⁻¹ in an FTIR spectrum?
A band near 703 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 6 cited sources
Quick answer
A band near 703 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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Aromatic ring | 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 |
| Metal oxygen | 1 | 1 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Possible materials
| Materiāls | Atbalstošie pīķi | Overlapping groups | Citētie avoti |
|---|---|---|---|
| polypropylene | 703, 1030, 1600 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| TiO2 | 703, 1700, 1093 | Hydroxyl (O-H), Alkyl C-H | 1 |
| calcite | 703, 2850, 2864 | Carbonate, Hydroxyl (O-H), Alkyl C-H | 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 703 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.
Literatūra aiz šiem piešķīrumiem
-
Alkyl C-H pārliecība 1,0
“Alkyne(C≡CStretching) (Medium) cm-1 cm-1 2935.05 ±2935 (Medium) Alkane (C-H Stretching) 1453.69cm-1 and1384.70cm-1 ±1470cm-1 Alkane(C-HBending) (Medium) cm-1 cm-1 cm-1 and 2868.32 ±2860 (Medium) Alkane (C-H Stretching) 2879.43 702.57cm-1 ±7”
Validation of the Developed Zero-Order Infrared Spectrophotometry Method for Qualitative and Quantitative Analyses of Tranexamic Acid in Marketed Tablets DOI: 10.3390/molecules26226985 -
Metal oxygen pārliecība 1,0
“The band cm-1 band (T is a tetrahedron of Al or Si) in KASH gels and a band at 463 corresponding to a lower located at approximately 703 cm-1 verifies the presence of Ti-O-Ti photoactive species, and it also Si-O-Si band intensity due to th”
Metakaolin-Based Geopolymer with Added TiO2 Particles: Physicomechanical Characteristics DOI: 10.3390/coatings7120233 -
Acetate pārliecība 1,0
“cm-1 cm-1 cm-1 1250 (aromatic ester C-O stretching), 1066 (C-O stretching), and 703 Polymers 2021, 13, x FOR PEER REVIEW 7 of 15 (C-H bending) [31-33].”
Dynamic Mechanical Properties and Thermal Properties of Longitudinal Basalt/Woven Glass Fiber Reinforced Unsaturated Polyester Hybrid Composites DOI: 10.3390/polym13193343 -
Hydroxyl (O-H) pārliecība 1,0
“bands at 3333 2335 1647 1414 1121 973 and 703 cm-1 O-H The peak at 3333 represents the existence of the group of phenolic compounds, cm-1 which mainly act as reducing agents for the NPs synthesis [28].”
Phytochemical-Assisted Synthesis of Fe3O4 Nanoparticles and Evaluation of Their Catalytic Activity DOI: 10.3390/mi13122077 -
pārliecība 1,0
“with double peaks at 702.6 and cm21 due to the fact that each calcium carbonate polymorph has 704.8 rel.”
Ramesh 等 - 2018 - In vivo characterization of bivalve larval shells DOI: 10.1098/rsif.2017.0723 -
pārliecība 0,9
“ATR-IR signal at 703 cm-1 corresponding to immobilized benzophenone.”
Iacono 等 - 2016 - Fabrication of a GMA-co-EDMA Monolith in a 2.0 mm DOI: 10.3390/ma9040263
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