What absorbs at 2949 cm⁻¹ in an FTIR spectrum?
A band near 2949 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 2949 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 | 12 | 11 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Fatty acid | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 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 |
| Amide | 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 |
|---|---|---|---|
| lignin | 2949, 1035, 1510 | Alkyl C-H, Methacrylate, Acetate | 1 |
| polypropylene | 2949, 1030, 1600 | Alkyl C-H, Methacrylate, Acetate | 1 |
| silver nanoparticles | 2949, 1636, 1631 | Alkyl C-H, Methacrylate, Acetate | 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 2949 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
-
Alkyl C-H uaminifu 1.0
“(+) -CH3 2977 2977 stretching of (-) (-) C-H 2949 2956 2947 2954 2931 2931 antisymmetric (+)”
Maeda - 2001 - IR spectroscopic study on the hydration and the ph DOI: 10.1021/la001346q -
Alkyl C-H uaminifu 1.0
“The bands at 2949 and 2992 were also observed and were found to have characteristics of C-H stretching vibration of”
Pathak 等 - 2020 - Attenuation of hepatic and breast cancer cells by DOI: 10.1016/j.bcab.2020.101863 -
Alkyl C-H uaminifu 1.0
“LLM confirmed rule peak-group candidate”
Alassod 等 - 2021 - PolypropyleneLigninPOSS Nanocomposites Thermal DOI: 10.3390/ma14143950 -
Alkyl C-H uaminifu 1.0
“explicit assignment in text”
Antifungal efficiency and cytocompatibility of polymethyl methacrylate modified with zinc dimethacrylate DOI: 10.3389/fcimb.2023.1138588 -
Alkyl C-H uaminifu 1.0
“that the present hydrogen binding functional groups nm.[20] Germany) to measure the absorbance at 570 cm-1, of methyl (C-H) stretch at 2949 methylene (C-H) cm-1, cm-1, cm-1.”
Hamdoon 等 - 2022 - Evaluation of biofilm formation on different clear DOI: 10.4103/jos.jos_7_22 -
Alkyl C-H uaminifu 1.0
“For QU-loaded natural saponite and synthetic saponite aliphatic (C-H) band vibration are shown at 2340 cm-1 and 2949 cm-1.”
Kumaresan 等 - 2019 - Synthesis of Saponite Based Nanocomposites to Impr DOI: 10.3390/ph12030105 -
Alkyl C-H uaminifu 1.0
“2014;Corazzarietal.,2015).Finally,thebandsofamideI,II and III, which are typical of chitosan, are observed at 1650, 1590and1317cm-1,respectively(Brancaetal.,2016).The CH/PCL FTIR spectra obtained with the mixtures showed cm-1 bands at 2949”
Nunez-Gastelum 等 - 2019 - SCREENING OF THE PHYSICAL AND STRUCTURAL PROPERTIE DOI: 10.24275/uam/izt/dcbi/revmexingquim/2019v18n1/Nunez -
Alkyl C-H uaminifu 1.0
“LLM confirmed rule peak-group candidate”
Bacterial Biofilm Formation Using PCL/Curcumin Electrospun Fibers and Its Potential Use for Biotechnological Applications DOI: 10.3390/ma13235556
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.