What absorbs at 1311 cm⁻¹ in an FTIR spectrum?
A band near 1311 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 5 cited sources
Jibu la haraka
A band near 1311 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 |
|---|---|---|---|
| Secondary amine | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 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 |
|---|---|---|---|
| Chitosan | 1311, 1650, 1655 | Alkyl C-H, Amide, N h | 1 |
| polyurethane | 1311, 2270, 1700 | Alkyl C-H, N h, Amide | 1 |
| CaCO3 | 1311, 1141, 712 | 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 1311 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
-
Amide uaminifu 1.0
“The C-O-C 𝑐𝑚-1, stretching vibration appears at 1075.12 while the C-N stretches around 1311.35 𝑐𝑚-1 (Timotius et al., 2022).”
Timotius 等 - 2022 - The Study of Methylene Blue Loading into Chitosan- DOI: 10.14716/ijtech.v13i8.6133 -
Acetate uaminifu 1.0
“Signals obtained at 1311 are assigned to C=O vibration in lignin and at 1361 associated to deformation of C-H group in cellulose and hemicellulose.”
Diego Mendez-Mejias 和 Moya - 2016 - Effects on density, shrinking, color changing and DOI: 10.18671/scifor.v44n112.03 -
C-O single bond uaminifu 1.0
“Bands at ~1311 1370 and the C-OH (or C-CH) bending mode.”
2D Correlation Spectroscopy (2DCoS) Analysis of Temperature-Dependent FTIR-ATR Spectra in Branched Polyethyleneimine/TEMPO-Oxidized CelluloseNano-Fiber Xerogels DOI: 10.3390/polym13040528 -
uaminifu 1.0
“A very sharp peaks at 1311 which refers to N-H stretching is observed due to 4+ the complexation with addition of NH 4NO between the NH ions from salt in the BPEs system.”
Shaffie 和 Khiar - 2018 - Characterization of Chitosan-starch Blend Based Bi DOI: 10.1063/1.5041232 -
Alkyl C-H uaminifu 1.0
“The peaks at around 1311 cm-1 were due to the twisting mode of -CH2, while that at around 1360 cm-1 corresponded to the methylene groups wagging vibrations [3,12,18].”
Fabrication of Aliphatic Water-Soluble Polyurethane Composites with Silane Treated CaCO3 DOI: 10.3390/polym12040747
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.