What absorbs at 675 cm⁻¹ in an FTIR spectrum?
A band near 675 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
Kiire vastus
A band near 675 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.
Võimalikud funktsionaalrühmade määramised
| Funktsionaalrühm | Toetavad faktid | Tsiteeritud allikad | Kõrgeim usaldusväärsus |
|---|---|---|---|
| Alkyl C-H | 4 | 4 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
Reiting kajastab kogunenud kirjanduslikke tõendeid, mitte ühte autoriteetset reeglit. Kinnitage alati oma proovi kontekstis.
Võimalikud materjalid
| Materjal | Toetavad piigid | Kattuvad rühmad | Tsiteeritud allikad |
|---|---|---|---|
| polyurethanes | 675, 1740, 1728 | Alkyl C-H | 1 |
| bitumen | 675, 1625, 810 | Alkyl C-H, Aromatic ring | 1 |
| oil shale | 675, 1625, 1053 | Alkyl C-H, Silicon-oxygen (Si-O), Aromatic ring | 1 |
| chitosan | 675, 1650, 1655 | Alkyl C-H, C-O single bond | 1 |
| gelatin | 675, 1652, 3300 | Alkyl C-H, C-O single bond | 1 |
| hematite | 675, 1030, 469 | Silicon-oxygen (Si-O), C-O single bond | 1 |
Materjale kuvatakse ainult siis, kui sama kirjanduse kogum toetab seda riba ja vähemalt ühte täiendavat iseloomulikku piiki.
Spektri loogika
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 675 cm⁻¹ is usually not enough for material identification by itself.
Reaalse maailma kasutus
Seda tüüpi päring on tavaline polümeeri tuvastamisel, tundmatu plasti sõeluuringul, kvaliteedikontrolli probleemide lahendamisel, ringlussevõetud materjali kontrollimisel ja kirjandusel põhineval piirkinnituste ülevaatel.
Levinud vead
- Ühe isoleeritud riba käsitlemine materjali tõendina ilma vähemalt ühte või kahte toetavat piiki kontrollimata.
- Ülekattumise ignoreerimine: mitu funktsionaalrühma võivad anda panuse sama lainearvu lähedal.
- Valideerimise vahelejätmine, kui lisandid, segud, oksüdatsioon või saastumine võivad spektrit moonutada.
Kontrollimise nõuanne
Kui ebakindlus püsib, kinnitage hüpotees DSC, GC-MS või TGA abil, eriti segude, lagunenud proovide ja täidetud polümeeride puhul.
Nende määramiste taga olev kirjandus
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Acetate usaldusväärsus 1,0
“Chem., 2020, 20 (3), 567 - 578 cm-1), cm-1 1470-1340 alkenes (C-H within the range of 995C-O-C asymmetric stretching, C-O 1500-1300 cm-1), cm-1 C-O functional group of alcohol, ether, of C-H bending and C675 stretching;”
Aziz 等 - 2020 - FTIR and HPLC-Based Metabolomics of Yacon Leaves E DOI: 10.22146/ijc.43453 -
Amide usaldusväärsus 1,0
“interactions.33 Accumulating lines of eviprotein-ligand cm-1 originates band at 675 corroborating the presence dences reported AuNPs pivotal role in rapid biomoleccm-1 nanoparticles44 of Au and an amide I band at 1638 recognition.34(cid:2)3”
Hetero-Functionalized Gold Nanoparticles to Silence AU-Rich Element Containing mRNAs in RAGE-Expressing Inflammatory Cells: Preparation, Characterization, and <i>In</i>-<i>Vitro</i> Evaluation DOI: 10.1166/jnn.2018.14648 -
Acetate usaldusväärsus 1,0
“10 768, 856, 955, 1265, 1412, 1447, 1667, 2907 and 2968 1085 C-O vibration Lactate [20], 11 cm-1, whereas peaks at 675, 747, 1169, 1225, 1304,”
Zou 等 - 2016 - Whole blood and semen identification using mid-inf DOI: 10.1039/C5AY03337C. -
C c single bond usaldusväärsus 1,0
“The cm-1, cm-1 strong C-OH band at 1045 C-H band at 850 and C-C band at cm-1 675 show an intense aromatic matrix in the oil shale [24, 26].”
Altun - 2009 - INCIDENTAL RELEASE OF BITUMEN DURING OIL SHALE GRI DOI: 10.3176/oil.2009.3.04 -
Alkyl C-H usaldusväärsus 1,0
“1102 1102 1027 1027 1042 C-O skeletal stretch - - 929 929 929 C-H deformation vibration (carbohydrate) Fingerprint - - 861 854 854 C-H deformation vibration (carbohydrate) 675 667 659 667 667 C-C Skeletal stretch Table 2.”
Characterization of gelatin/chitosan ploymer films integrated with docosahexaenoic acids fabricated by different methods DOI: 10.1038/s41598-019-44807-x -
usaldusväärsus 1,0
“In celadonite, the Si-O stretching and cm-1, bending vibrations [72] are seen at 675, 490, 455 and 437 while in glauconite, these cm-1.”
Assessment of Easily Accessible Spectroscopic Techniques Coupled with Multivariate Analysis for the Qualitative Characterization and Differentiation of Earth Pigments of Various Provenance DOI: 10.3390/min12060755 -
C c single bond usaldusväärsus 1,0
“Besides, peaks at 675 cm(cid:0) 1 C-C-C C-H bending [41].”
Hossain 和 Roy - 2023 - Monitoring the curing efficiency of a plant-based DOI: 10.1016/j.heliyon.2023.e16273 -
Alkyl C-H usaldusväärsus 1,0
“Between 900 cm-1 and 675 cm-1, axial deformation vibrations, characteristic of the off-plane angular deformation of the C-H bonds of aromatic rings were identified [47].”
Biodegradation Study of Polyurethanes from Linseed and Passion Fruit Oils DOI: 10.3390/coatings12050617
Kas teil on selle ribaga spekter?
Laadige üles oma FTIR spekter ja saage sekunditega täielik tõlgendusaruanne — piikide määramised kirjandusviidetega, raamatukogu vasted ja usaldusväärsusega hinnatud tõendite ahel.