Hvad absorberer ved 1160 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1160 cm⁻¹ kan pege på flere funktionelle grupper. Nedenfor er de mest sandsynlige tildelinger, rangeret efter hvor meget publiceret bevis der understøtter hver — hver enkelt spores til litteratur (DOI) og krydsvalideres mod vores 130.000+ referencespektre og vidensgraf.
Backed by 8 cited sources
Hurtigt svar
Et bånd nær 1160 cm⁻¹ fortolkes normalt ved at kontrollere, hvilke funktionelle grupper der gentagne gange forekommer der i litteraturen, og derefter bekræfte mindst en eller to yderligere peaks i den samme prøve. Denne side rangerer disse tildelinger efter akkumuleret evidens snarere end efter en enkelt fast lærebogsregel.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| C-O single bond | 56 | 55 | 1,0 |
| Methacrylate | 54 | 53 | 1,0 |
| Acetate | 53 | 52 | 1,0 |
| Methoxy (OCH3) | 52 | 51 | 1,0 |
| Alkyl C-H | 17 | 15 | 1,0 |
| Carbohydrate | 10 | 10 | 1,0 |
| Hydroxyl (O-H) | 10 | 10 | 1,0 |
| Amide | 8 | 7 | 1,0 |
| Secondary amine | 7 | 6 | 1,0 |
| C c single bond | 6 | 6 | 1,0 |
| Carbonyl (C=O) | 5 | 5 | 1,0 |
| Ester | 4 | 4 | 1,0 |
| Silicon-oxygen (Si-O) | 4 | 4 | 1,0 |
| Phosphate (PO4) | 4 | 4 | 1,0 |
| C n single bond | 4 | 3 | 1,0 |
| N h | 4 | 3 | 1,0 |
| Ring structure | 3 | 3 | 1,0 |
| Aromatic ring | 3 | 3 | 1,0 |
| Ketone | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| Lipid | 3 | 3 | 1,0 |
| Aldehyde (CHO) | 3 | 3 | 0,9 |
| Alkene (C=C) | 3 | 2 | 1,0 |
| Thiocarbonyl | 2 | 2 | 1,0 |
| Hydrogen bond | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| C-S single bond | 2 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Thiol | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Phenolic | 1 | 1 | 0,8 |
| S eq o | 1 | 0 | 1,0 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| cellulose | 1160, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| starch | 1160, 1650, 1540 | Methacrylate, Acetate, C-O single bond | 1 |
| microplastics | 1160, 1643, 1614 | Methacrylate, Acetate | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
Dette bånd bliver meningsfuldt kun, når det læses sammen med sine nabotoppe. I praksis ser analytikere først på tildelingerne ovenfor, og kontrollerer derefter, om den samme prøve også viser andre toppe, der forventes for det samme strukturelle motiv. Et enkelt bånd nær 1160 cm⁻¹ er normalt ikke nok til materialeidentifikation alene.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Acetate tillid 1,0
“cm-1: specified as follows: 1440 O-H plane bending, 1420 C-H plane deformation in cm-1: cm-1: cm-1: lignin, 1370 -C-H bending in wood, 1320 C-O syringyl ring and CH wagging, 1240 con2 cm-1: jugated ketone (phenyl-carbonyl) in lignin, 1160 C”
Physicochemical characterisation of barley straw treated with sodium hydroxide or urea and its digestibility and in vitro fermentability in ruminants DOI: 10.1038/s41598-022-24738-w -
Borate tillid 1,0
“matrix.7,14 advancement of the charred layer further into the structure.53 G-mode peak represents the normal graphite However,theB-OstretchingcausedbyO-B-Ostretching,which cm(cid:3)1 cm(cid:3)1 4.3 Compositional analysis by FT-IR spectrosco”
Reticulated three-dimensional network ablative composites for heat shields in thermal protection systems DOI: 10.1039/c4ra05811a -
Alkyl C-H tillid 1,0
“cm-1 cm-1 cm-1 stretching), 2894 (aliphatic C-H stretching), 1160 (bridge O stretching), 1050 (C-O stretching), also the usual characteristic pattern of cellulose can be seen in the fingerprint region.”
Surface modification of bacterial cellulose membrane by oxygen plasma treatment DOI: 10.1016/j.surfcoat.2016.06.035 -
Acetate tillid 1,0
“The region at 1000-1200 is 1160cm-1), attributed to the stretching vibration absorptions of the C-O (around indicating different C-O-containing degradation products but may also indicate phosphate ions, bonds of the glycosidic linkages [52]”
Campanale 等 - 2023 - Fourier Transform Infrared Spectroscopy to Assess DOI: 10.3390/polym15040911 -
Alkyl C-H tillid 1,0
“3 2 3asymmetric and symmetric vibrations of CF 3SO [5] 1250 1249 1251 1253 1250 SO 3 C-H BMIM+ and symmetric stretching mode of CF 1160 1168 1166 1166 1167 vibrational mode for cyclic”
Effects of ionic liquid on the hydroxylpropylmethyl cellulose (HPMC) solid polymer electrolyte DOI: 10.1007/s11581-016-1768-0 -
Acetate tillid 1,0
“The absorption peak at 1160 could be attributed to the C-O cm-1 bending vibration [38].”
Gani 等 - 2017 - Physico-chemical, structural, pasting and thermal DOI: 10.1016/j.ijbiomac.2016.10.100 -
C-S single bond tillid 1,0
“The bands at 1160 and 1053 reductive desorption characteristics for both aerial and electroN-N C-S are assigned to and stretching frequencies,”
Kalimuthu 等 - 2009 - Leaflike Structured Multilayer Assembly of Dimerca DOI: 10.1021/jp810337s -
Acetate tillid 1,0
“The absorption band at cm-1 1735 could be attributed to C=O vibrations in DAS, while the weak peak at cm-1 1160 was caused by C-O bond stretching of C-OH group in glucan residues.”
Synthesis of a Magnetic Nanoparticles/Dialdehyde Starch‐based Composite Film for Food Packaging DOI: 10.1002/star.201800035
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