Hvad absorberer ved 1180 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1180 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 1180 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 | 24 | 21 | 1,0 |
| Methoxy (OCH3) | 19 | 17 | 1,0 |
| Methacrylate | 19 | 17 | 1,0 |
| Acetate | 19 | 17 | 1,0 |
| Amide | 9 | 9 | 1,0 |
| Alkyl C-H | 6 | 6 | 1,0 |
| N h | 5 | 5 | 1,0 |
| Secondary amine | 5 | 5 | 1,0 |
| C n single bond | 5 | 5 | 1,0 |
| Aromatic ring | 5 | 5 | 1,0 |
| Siloxane (Si-O-Si) | 5 | 4 | 1,0 |
| Silicon-oxygen (Si-O) | 5 | 3 | 1,0 |
| Ester | 4 | 4 | 1,0 |
| Carboxyl (COOH) | 4 | 4 | 1,0 |
| Hydroxyl (O-H) | 4 | 3 | 1,0 |
| Ketone | 3 | 3 | 1,0 |
| Carbonyl (C=O) | 3 | 3 | 1,0 |
| Nucleic acid | 3 | 3 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Oxygen heterocycle | 2 | 2 | 1,0 |
| Fluorine (C-F) | 2 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 1 | 1,0 |
| Silicon (Si) | 2 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Chitosan | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| N c o | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Silicon nitrogen | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 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 |
|---|---|---|---|
| zinc oxide | 1180, 1627, 1638 | Methacrylate, Acetate, C-O single bond | 1 |
| PVDF | 1180, 1160, 840 | Methacrylate, Acetate | 1 |
| MgO | 1180, 699, 874 | Methoxy (OCH3), Methacrylate, C-O single bond | 1 |
| PHB | 1180, 3440, 1724 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| PLLA | 1180, 1182, 921 | C-O single bond, Methoxy (OCH3), Methacrylate | 1 |
| CS | 1180, 1645, 1720 | Methacrylate, C-O single bond, 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 1180 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
-
N-O bond tillid 1,0
“film 1170cm-1 1180cm-1 same from to suggesting possible transformation from to This showed no film apparent defect on its surface.”
Arshad 等 - 2019 - Dielectric and Structural Properties of Poly(vinyl DOI: 10.1155/2019/5961563 -
C-O single bond tillid 1,0
“3400-3200 3450 ~3325 C─O─C 1140-1070 stretch/ether stretch 1180, 1031 1179, 1028 48404 (4 of 9) J.APPL.POLYM.SCI.2019, DOI: 10.1002/APP.48404 ARTICLE”
Influence of amine‐terminated additives on thermal and mechanical properties of diglycidyl ether of bisphenol A (DGEBA) cured epoxy DOI: 10.1002/app.48404 -
tillid 1,0
“[Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.] cm21 et al [41] proposed a mechanism for twist banding, which are assigned reported [7, 30] that the bands at 1180 C(cid:1)(cid:1)O(cid:1)(cid:1”
Effect of processing conditions on the development of morphological features of banded or nonbanded spherulites of poly(3hydroxybutyrate) (PHB) and polylactic acid (PLLA) blends DOI: 10.1002/pen.21991 -
C-O single bond tillid 1,0
“The FTIR spectroscopy study of neat PLA having various functional groups C=O al cm-1), cm-1), stretching vibrations (~ 1749 asymmetric C-O-C stretching (1180 symmetric and cm-1), cm-1), asymmetric -CH vibrations (1128 and 1042 C-OH side gro”
Ghosh 等 - 2020 - Blown films fabrication of poly lactic acid based DOI: 10.1016/j.mtcomm.2019.100737 -
tillid 1,0
“Si-O Si-O symmetric stretching 1040 - [2,16] 2(cid:3)1019 N-H N-H wag-rocking 1150 [15] Si-O Si-O asymmetric stretching 1180 - [2,16] 7(cid:3)1019 2000 [15] Si-H H-Si-Si3”
Effect of PECVD silicon oxynitride film composition on the surface passivation of silicon wafers DOI: 10.1016/j.solmat.2011.09.052 -
Aromatic ring tillid 1,0
“N=O (NO ) symmetric stretching 1340 2 C-N stretching (aryl) 1180 In plane aromatic C-H deformation”
Synthesis and characterization of Heck-cross coupling 4-(4-nitrostyryl) aniline as potential precursor in Schiff-base synthesis DOI: 10.1063/1.5002293 -
tillid 1,0
“A weak absorption peak at 450 cm-1 corresponds to the Si-N stretching while a N-H bending peak is also observed at 1180 cm-1 [20].”
Deposition of Silicon Nitride Films using Chemical Vapor deposition for Photovoltaic Applications DOI: 10.1016/j.rinp.2016.11.029 -
tillid 1,0
“(iii) Two successive distinct broad bands with the first extended It is to be mentioned that the clear identification and strong -1 from 780 to 1150 cm and showing two peaks at 930 and appearance of the vibrational bands due to both borate”
Marzouk 等 - 2021 - Judd-Ofelt analysis of spectroscopic measurements DOI: 10.1016/j.molstruc.2021.130925
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