Hvad absorberer ved 864 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 864 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 864 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 | 5 | 5 | 1,0 |
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Carbohydrate | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| C c single bond | 3 | 2 | 1,0 |
| Alkyl C-H | 3 | 2 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| Chlorine | 2 | 1 | 1,0 |
| Alkene (C=C) | 2 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 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 |
| Carbonate | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Bromine | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Aldehyde (CHO) | 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 |
|---|---|---|---|
| cellulose | 864, 1735, 1650 | C-O single bond, Hydroxyl (O-H), Methoxy (OCH3) | 1 |
| hydroxyapatite | 864, 1620, 1639 | Hydroxyl (O-H) | 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 864 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
“Additional bands corresponding to C-O-H bending appeared at 1291 After treatment of wood samples with DES2, new peaks were formed at 1039, 952, 943 and cm-1, 864 which were C-O vibrations in hemicellulose and cellulose, a C-H deformation in”
Can 等 - 2023 - Choline Chloride-Based Deep Eutectic Solvent-Treat DOI: 10.3390/f14030569 -
Alkene (C=C) tillid 1,0
“cm-1 In the bands at 3009 in the reaction with IA (Figure 5b), the peak referring to cm-1 the double bond disappeared, promoting a stretching at 864 (Figure 6) and resulting”
Montenegro 等 - 2023 - Enzymatic and Synthetic Routes of Castor Oil Epoxi DOI: 10.3390/polym15112477 -
Aldehyde (CHO) tillid 1,0
“cm-1 formation at 864.11 is due to stretching vibration of -C-Na bond which also considered as the coupling reaction between -CHO from OSA and -NH 2”
Preparation of In Situ Cross - Linked N - Maleoyl Chitosan - Oxidized Sodium Alginate Hydrogels for Drug Delivery Applications DOI: 10.3889/oamjms.2019.850 -
Phosphate (PO4) tillid 1,0
“The small stretch at 864 cm-1 and 32corresponds to octacalcium phosphate and amorphous calcium 1378 cm-1”
Novel synthesis of bioactive hydroxyapatite/f-multiwalled carbon nanotube composite coating on 316L SS implant for substantial corrosion resistance and antibacterial activity DOI: 10.1016/j.jallcom.2018.10.341 -
Bromine tillid 1,0
“cm-1 The bands at 864 and 861 were assigned as C14HOOP in SRII (Figure 4c) and BR-T (d), respectively, the presence of which is highly correlated with negative pho- (28).”
Suzuki 等 - 2008 - Structural Changes of Salinibacter Sensory Rhodops DOI: 10.1021/bi801358b -
Carbohydrate tillid 1,0
“The presence of absorption peaks at about 3733, 3500, 3492, 2920, 2826, 1946, 1536, 1372, and 864 cm-1 were associated with the representative functional groups of cellulose [53,54].”
Characterizations of Alpha-Cellulose and Microcrystalline Cellulose Isolated from Cocoa Pod Husk as a Potential Pharmaceutical Excipient DOI: 10.3390/ma15175992 -
Acetate tillid 1,0
“cm-1 cm-1, All starches showed bands around 864 and 770 which were related to the stretching α-configuration vibration of C-O-C and C-O-H from glycosidic bonds.”
Antobelli Basilio-Cortes 等 - 2019 - Effect of Dual Modification on the Spectroscopic, DOI: 10.3390/polym11020333 -
Hydroxyl (O-H) tillid 1,0
“• Stretching vibrations of C-O bonds in COOH [21] Arenesovertonesduetomono-substitution(689cm-1 1905-1699 1905-1699 * • band)metadi-substitution(864cm-1 band) • O-H group in absorbed molecules of water and/or structural molecules of water o”
The Origin and Physico-Chemical Properties of Some Unusual Earth Rock Fragments DOI: 10.3390/app12030983
Har du et spektrum med dette bånd?
Upload dit FTIR-spektrum og få en fuld fortolkningsrapport — peak-tildelinger med litteraturhenvisninger, biblioteksmatch og en litteraturunderstøttet analyse — på få sekunder.