What absorbs at 685 cm⁻¹ in an FTIR spectrum?
A band near 685 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
Ātra atbilde
A band near 685 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 4 | 4 | 1,0 |
| Metal oxygen | 3 | 3 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Urea | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| silver nanoparticles | 685, 1636, 1631 | Alkyl C-H | 1 |
Materiāli tiek parādīti tikai tad, ja šo joslu un vismaz vienu papildu raksturīgo pīķi atbalsta tā pati literatūras kopa.
Spektra loģika
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 685 cm⁻¹ is usually not enough for material identification by itself.
Reālās pasaules izmantošana
Šāda veida vaicājums ir izplatīts polimēru identificēšanā, nezināmas plastmasas skrīningā, kvalitātes kontroles problēmu risināšanā, pārstrādāto materiālu pārbaudē un ar literatūru pamatotā pīķu piešķīruma pārskatā.
Biežākās kļūdas
- Vienas izolētas joslas uzskatīšana par materiāla pierādījumu, nepārbaudot vismaz vienu vai divus atbalsta pīķus.
- Ignorējot pārklāšanos: vairākas funkcionālās grupas var dot ieguldījumu tuvu tam pašam viļņa skaitlim.
- Izlaist validāciju, ja piedevas, maisījumi, oksidācija vai piesārņojums var izkropļot spektru.
Verifikācijas padoms
Ja joprojām pastāv neskaidrība, apstipriniet hipotēzi ar DSC, GC-MS vai TGA, īpaši maisījumiem, noārdītiem paraugiem un pildītiem polimēriem.
Literatūra aiz šiem piešķīrumiem
-
pārliecība 1,0
“Similarly by GGA cm(cid:2)1 (i) The frequencies due to Si-O in-plane bending vibrations, method, the peak position is 685.2 in [P] and shifts to”
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 -
pārliecība 1,0
“[3] made a MgO 10.46% 15.88% comparison between the FTIR spectra of Mg-rich and Mg-poor K2O 0.71% 0.25% 3585cm-1 palygorskites, and concluded that the vibration was Na2O 0.02% 0.01% 685cm-1 Fe)(cid:2)OH Mg)(cid:2)OH, P2O5 0.04% 0.34% caused”
Cai 等 - 2007 - A Fourier transform infrared spectroscopic study o DOI: 10.1016/j.saa.2006.02.053 -
pārliecība 1,0
“(2006), similar bands observed at 685 and are attributed to the Fe-O”
do Nascimento-Dias 等 - 2020 - Detection of organic or inorganic material in Mart DOI: 10.1017/S147355042000021X -
Phosphate (PO4) pārliecība 1,0
“The two peaks at 611 and 685 cm-1 cm-1 692 caused by P-O bending in phosphate.”
Ashemary 等 - 2023 - Preparation and characterization of mesoporous Lan DOI: 10.15251/DJNB.2023.182.681 -
Urea pārliecība 1,0
“The wavenumber around 1,673-1,685 cm-1 corresponded to free hydrogen-bonded urea carbonyl.”
Che 等 - 2019 - Investigations on Aging Behavior and Mechanism of DOI: 10.3390/ma12213636 -
Phosphate (PO4) pārliecība 1,0
“The spectral bands associated with polyphosphates, namely P=O stretching (1165 cm-1) and P-O-P stretching (685 cm-1), were weak and Int.”
Assessment of Biotechnologically Important Filamentous Fungal Biomass by Fourier Transform Raman Spectroscopy DOI: 10.3390/ijms -
Borate pārliecība 1,0
“(cm-1) Frequencies Assignment Reference ~685 B-O-B bending vibration [29]”
Facile Synthesis of Calcium Borate Nanoparticles and the Annealing Effect on Their Structure and Size DOI: 10.3390/ijms131114434 -
Aromatic ring pārliecība 1,0
“The peak at cm-1 685 may be assigned due to the stretching vibration of aromatic ring that might be attached to the free O-H Gracilaria group.”
Kumar 等 - 2013 - Seaweed-mediated biosynthesis of silver nanopartic DOI: 10.1007/s13204-012-0151-3
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