Hvad absorberer ved 960 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 960 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 960 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 |
|---|---|---|---|
| Phosphate (PO4) | 24 | 23 | 1,0 |
| Silicon-oxygen (Si-O) | 16 | 13 | 1,0 |
| Silanol (Si-OH) | 14 | 13 | 1,0 |
| Silicon (Si) | 13 | 10 | 1,0 |
| Hydroxyl (O-H) | 11 | 10 | 1,0 |
| Alkyl C-H | 8 | 8 | 1,0 |
| Siloxane (Si-O-Si) | 5 | 5 | 1,0 |
| Phosphorus | 5 | 5 | 1,0 |
| Metal oxygen | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| C-S single bond | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Borate | 2 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Quaternary ammonium | 1 | 1 | 1,0 |
| Silicate | 1 | 1 | 1,0 |
| Styrene | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Thiocarbonyl | 1 | 1 | 1,0 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
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 960 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
-
Phosphate (PO4) tillid 1,0
“cm-1 Additional peaks were found in both models at 1,062, 1,053, 1,047, 1,040, and 1,029 b cm-1) cm-1 m The peak width range was restricted to the width of the sample's phosphate peak (at 960 ± 2 1 c Chi-squared is the weighted difference b”
Awonusi 等 - 2007 - Carbonate assignment and calibration in the raman DOI: 10.1007/s00223-007-9034-0 -
Phosphate (PO4) tillid 1,0
“5 highlights that the first two IR bands, assigned to the cm-1 cm-1, Mo-O-Mo vibrational modes, are up-shifted from 792 and 870 to 800 and 887 while the last two IR cm-1 Mo=O bands attributed to the and P-O vibrational modes are down-shifte”
Baibarac 等 - 2019 - Adsorption of 1,4-phenylene diisothiocyanate onto DOI: 10.1038/s41598-019-48314-x -
Amide tillid 1,0
“C-C p coupling of ligands to specific platelets receptors, leading of < 0.05) are related to stretching vibrations in cm-1) intra-cellular extra-cellular signaling,[43] and the amide I band it is to and carbon chains of lipids (960 cm-1).”
Analysis of platelets in hypertensive and normotensive individuals using Raman and Fourier transform infrared‐attenuated total reflectance spectroscopies DOI: 10.1002/jrs.5540 -
C-S single bond tillid 1,0
“This in situ method is performed by the direct and stoim The presence of (C---S) absorption bands located at 960-”
Haezam 等 - 2021 - Synthesis and cytotoxic activity of organotin(IV) DOI: 10.1016/j.sjbs.2021.02.060 -
Phosphate (PO4) tillid 1,0
“LLM confirmed rule peak-group candidate”
Jaber 和 Kovacs - 2019 - Preparation and synthesis of hydroxyapatite bio-ce DOI: 10.14382/epitoanyag-jsbcm.2019.18 -
Metal oxygen tillid 1,0
“For the TiO loaded SBA-15 photocatalysts, the IR 2 cm-1 ∼960 absorption at is commonly accepted as the characteristic vibration of the Ti-O-Si bond.”
Synthesis of TiO<sub>2</sub> Supported on SBA-15 Using Chelating Method and Their Photocatalytic Decomposition of Methylene Blue DOI: 10.1166/jnn.2011.3207 -
Acetate tillid 1,0
“Negative, Artefact ≅920+1037 1970 SiO2 combination band or 970+1000 [60] C=O stretching shoulder Negative, Artefact ≅960+1000 combination band C=O stretching”
FTIR photoacoustic spectroscopy for identification and assessment of soil components_ Chernozems and their size fractions DOI: 10.1016/j.pacs.2020.100162 -
Silicon (Si) tillid 1,0
“cm¡1 A frequency at about 960 was to a vibration at 960 reported as well in HCl-treated palygorskite and assigned to a Si-OH vibration (12).”
Modification of Chrysotile Surface by Organosilanes: An IR–Photoacoustic Spectroscopy Study DOI: 10.1006/jcis.2001.7524
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