What absorbs at 439 cm⁻¹ in an FTIR spectrum?
A band near 439 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 7 cited sources
Jibu la haraka
A band near 439 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.
Ugawaji unaowezekana wa vikundi vya kazi
| Kikundi cha kazi | Ukweli unaounga mkono | Vyanzo vilivyotajwa | Uaminifu wa juu |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 4 | 4 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 0 | 1.0 |
Cheo kinaonyesha ushahidi wa fasihi uliokusanywa, si sheria moja yenye mamlaka. Thibitisha kila mara dhidi ya mazingira ya sampuli yako.
Nyenzo zinazowezekana
| Nyenzo | Vilele vya usaidizi | Vikundi vinavyoingiliana | Vyanzo vilivyotajwa |
|---|---|---|---|
| kaolinite | 439, 3696, 693 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 1 |
Nyenzo zinaonyeshwa tu wakati mkusanyiko sawa wa fasihi unaunga mkono bendi hii na angalau kilele kimoja cha ziada cha sifa.
Mantiki ya wigo
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 439 cm⁻¹ is usually not enough for material identification by itself.
Matumizi ya ulimwengu halisi
Aina hii ya swala ni ya kawaida katika utambuzi wa polima, uchunguzi wa plastiki isiyojulikana, utatuzi wa shida za QC, uthibitishaji wa nyenzo zilizosindikwa, na ukaguzi wa ugawaji wa kilele unaoungwa mkono na fasihi.
Makosa ya kawaida
- Kuchukua bendi moja iliyotengwa kama uthibitisho wa nyenzo bila kuangalia angalau kilele kimoja au viwili vya usaidizi.
- Kupuuza mwingiliano: vikundi vingi vya utendaji vinaweza kuchangia karibu na nambari ya wimbi sawa.
- Kuruka uthibitishaji wakati viongezi, mchanganyiko, uoksidishaji, au uchafuzi unaweza kupotosha wigo.
Ushauri wa uthibitishaji.
Wakati utata unabaki, thibitisha nadharia kwa kutumia DSC, GC-MS, au TGA, hasa kwa mchanganyiko, sampuli zilizoharibika, na polima zilizojazwa.
Fasihi nyuma ya ugawaji huu
-
C c single bond uaminifu 1.0
“absorption peak is observed near 439 This feature cm(cid:3)1 (A0) n C¼C-C is attributed to in-plane bending mode of 3.3.1.”
Temperature-dependent absorption cross-section measurements of 1-butene (1-C4H8) in VUV and IR DOI: 10.1016/j.jqsrt.2012.09.014 -
uaminifu 1.0
“a peak at 439 arises from Si-O-Si bending vibration.”
Souissi 等 - 2022 - Synthesis, Thermal Properties and Electrical Condu DOI: 10.21203/rs.3.rs-1294285/v1 -
Silicon (Si) uaminifu 1.0
“The absorption band detected at 439 wavenumber cm-1 can be ascribed to Si-O bending.”
Hydroprocessing of Oleic Acid for Production of Jet-Fuel Range Hydrocarbons over Cu and FeCu Catalysts DOI: 10.3390/catal9121051 -
Metal oxygen uaminifu 1.0
“Process., 56(5), 2020, 860-873 865 cm-1 and 439.45 cm-1 were contributed by asymmetric stretching vibration peaks and out-of-plane bending vibration absorption peaks of -W-O bonds of WO 42-.”
Lu 等 - 2020 - Effect of manganese ions addition orders on the fl DOI: 10.37190/ppmp/126421 -
uaminifu 1.0
“The 439 peak in the geopolymer relative to Si-O bond while in powders this cm-1.”
Pereira 等 - 2019 - Synthetic Aluminosilicates for Geopolymer Producti DOI: 10.1590/1980-5373-MR-2018-0508 -
Metal oxygen uaminifu 0.9
“Nb-O bond characteristic”
Wang 和 Jiang - 2011 - Synthesis and Characterization of LiNbO3 Powders b DOI: 10.1080/00150193.2011.554260 -
Silicon-oxygen (Si-O) uaminifu 0.9
“Stretching vibrations of Si-O-T or Al.”
EL Alouani 等 - 2020 - Influence of the Nature and Rate of Alkaline Activ DOI: 10.1155/2020/8880906
Una wigo wenye bendi hii?
Pakia wigo wako wa FTIR na upate ripoti kamili ya tafsiri — ugawaji wa vilele na marejeleo ya fasihi, ulinganishaji wa maktaba, na mlolongo wa ushahidi wenye kiwango cha uaminifu — kwa sekunde.