Hvad absorberer ved 930 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 930 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 930 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 13 | 10 | 1,0 |
| Hydroxyl (O-H) | 9 | 9 | 1,0 |
| Alkyl C-H | 8 | 8 | 1,0 |
| C-O single bond | 7 | 6 | 1,0 |
| Silicon (Si) | 6 | 6 | 1,0 |
| Methoxy (OCH3) | 5 | 5 | 1,0 |
| Methacrylate | 5 | 5 | 1,0 |
| Acetate | 5 | 5 | 1,0 |
| Siloxane (Si-O-Si) | 5 | 5 | 1,0 |
| Aromatic ring | 4 | 4 | 1,0 |
| Metal oxygen | 4 | 3 | 1,0 |
| Phosphate (PO4) | 3 | 3 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Ammonium | 3 | 3 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Silicon fluorine | 2 | 2 | 1,0 |
| Aldehyde (CHO) | 2 | 2 | 0,9 |
| Silanol (Si-OH) | 2 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 0,9 |
| Oxygen heterocycle | 1 | 0 | 0,9 |
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 | 930, 1627, 1638 | Alkyl C-H, C-O single bond | 1 |
| SiO | 930, 800, 1745 | Silicon-oxygen (Si-O), Hydroxyl (O-H), C-O single bond | 1 |
| kaolinite | 930, 3696, 693 | Hydroxyl (O-H), Silicon-oxygen (Si-O) | 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 930 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
-
Carbonate tillid 1,0
“S1 S1-12h S1-24h S1-48h S1-72h S1-1 week Remarks 461.1 461.1 461.1 450.9 471.3 420.4, 416.1 Peak intensity changes as hydration time increases 522.2 522.2 527.3 527.3 522.2 532.4 Peak intensity changes as hydration time increases SO42(cid:2”
Theoretical and experimental study of structures and properties of cement paste The nanostructural aspects of C–S–H DOI: 10.1016/j.jpcs.2011.05.001 -
Aromatic ring tillid 1,0
“The intensity gradually and the absorption intensity of the peak at cm(cid:2)1 of the peak at 930 attributed to tri-substituted benzene cm(cid:2)1 decreases along with the increase of temperature 930 ring that is attached with oxazine ring”
Cao 等 - 2008 - Synthesis and thermal properties of the thermosett DOI: 10.1016/j.polymdegradstab.2007.10.002 -
tillid 1,0
“As the additive fluorine concentration increases, the intensity of Si-F peak cm-1 increases and the frequency of the Si-O stretching stretching vibrations located at 930 cm-1 vibration mode centered at 1060 shifts towards higher wavenumber.”
Chabane 等 - 2009 - Characterization of SiOF thin films deposited by P DOI: 10.4028/www.scientific.net/MSF.609.59 -
Hydroxyl (O-H) tillid 1,0
“Citation: Chen,S.;Tan,H.;Zhang, Compared with sapphires from other origins, sapphires from this mine have three characteristic C.;Teng,Y.;Zu,E.Studyon cm-1, cm-1 infrared peaks of kaolinite at 930, 1025, and 1110 of which the single peak at”
Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar DOI: 10.3390/cryst11111275 -
C c single bond tillid 1,0
“cm-1 in C-OH group and stretching of C-C in the carbohydrate The area below 930 (from 930 cm-1) to about 700 is the vibration area, which is very characteristic for vibrations from the anomeric region”
Identification of sugars and phenolic compounds in honey powders with the use of GC–MS, FTIR spectroscopy, and X-ray diffraction DOI: 10.1038/s41598-020-73306-7 -
Silicon (Si) tillid 1,0
“Figure 3 also tends to strengthen the Si-O bonds and change Si-O-Si shows the Si-F stretching mode peak located at around 930 bonding angles.”
Lee 和 Park - 1996 - Effect of fluorine on dielectric properties of SiO DOI: 10.1063/1.363512 -
Borate 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 -
Metal oxygen tillid 1,0
“Ti-O-Si portant feature to be noted here is the presence of the cm-1 ∼930 absorption peak located at [18,20], which is a clear Ti-O-Si indication that the Si, Ti and O atoms were mixed at the atomic (b) clearly shows that the relative inten”
Sarkar 等 - 2007 - Dielectric properties of sol-gel derived high-k ti DOI: 10.1016/j.tsf.2006.11.155
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.