What absorbs at 921 cm⁻¹ in an FTIR spectrum?
A band near 921 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
Jibu la haraka
A band near 921 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 |
|---|---|---|---|
| Alkyl C-H | 6 | 5 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Aldehyde (CHO) | 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 |
|---|---|---|---|
| PLLA | 921, 1182, 1109 | Alkyl C-H | 2 |
| TiO2 | 921, 1700, 1093 | Alkyl C-H | 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 921 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
-
Silicon (Si) uaminifu 1.0
“Asymmetric stretching of Si-Ois indicated by a peak at 921 [24], symmetric bending of Si-O bond in the SiO4 1 3 cm(cid:0) cm(cid:0) 1 1 units is shown by the peak at 640 [25], asymmetric bending of Si-O-Si bond is shown by the peak at 491 [”
Reddish-orange emission from sol-gel derived Sm3+-doped Sr2La8(SiO4)6O2 phosphors DOI: 10.1016/j.ijleo.2020.165935 -
Alkyl C-H uaminifu 1.0
“Small peaks at 921 and 1045 associated with adventitious hydrocarbons.”
Wong 等 - 2015 - Synthesis and Characterization of Atomically Flat DOI: 10.1021/jacs.5b03339 -
Alkyl C-H uaminifu 1.0
“The peak at 3,014 is due cm-1 3,213 are due to the -C=Cand =CH modes of adsorbed to CH stretching of alkenes (Mistry, 2009), the doublet at 2,9642,921cm-1 groups,whilethe2,877cm-1 acetylene, whose formation is accompanied by the complete is”
Carbon Domains on MoS2/TiO2 System via Catalytic Acetylene Oligomerization: Synthesis, Structure, and Surface Properties DOI: 10.3389/fchem.2017.00091 -
Alkyl C-H uaminifu 1.0
“In detail, the peak at 921 corresponds to the typical bending of C-H of”
Durazzo 等 - 2018 - Qualitative Analysis of Traditional Italian Dishes DOI: 10.3390/su10114112 -
uaminifu 1.0
“Text: 'band at 921 cm-1 is ascribed to the PLLA crystal phases'”
Nguyen Thai Cuong 等 - 2020 - On the Nanoscale Mapping of the Mechanical and Pie DOI: 10.3390/app10020652 -
Alkyl C-H uaminifu 1.0
“cm-1 cm-1 (C=O stretching), ≈1645 (C=O stretching), ≈1329 (C-H bending), ≈1022 and cm-1 cm-1 ≈1100 (C-H carbohydrate skeleton stretching) and 921 (Wang et al., 2016).”
Development of functional pectin edible films with fillers obtained from red cabbage and beetroot DOI: 10.1111/ijfs.14886 -
C c single bond uaminifu 1.0
“The characteristic IR band of cm-1 921 was assigned to the coupling of the C-C backbone stretching with the CH rocking 3 α(cid:48)-forms αmode, which is ascribed to the and [32,33,55].”
Temperature-Dependent Polymorphism and Phase Transformation of Friction Transferred PLLA Thin Films DOI: 10.3390/polym14235300 -
uaminifu 0.9
“Text: 'bands at 946 and 921 correspond to stretching'.”
Silver-controlled evolution of morphological, structural, and optical properties of three-dimensional hierarchical WO3 structures synthesized from hydrothermal method DOI: 10.1016/j.jallcom.2017.11.095
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.