Hvad absorberer ved 770 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 770 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 770 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 | 4 | 4 | 1,0 |
| Metal oxygen | 4 | 3 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Aromatic ring | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Urethane | 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 |
|---|---|---|---|
| TiO2 | 770, 1700, 1093 | Metal oxygen, Alkyl C-H, C-O single bond | 1 |
| polyurethane | 770, 2270, 1700 | Alkyl C-H, C-O single bond | 1 |
| composite | 770, 1703, 1295 | Alkyl C-H, C-O single bond, Aromatic ring | 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 770 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
-
tillid 1,0
“O-O the shoulder at 770 can be assigned to the stretching support to the latter "nucleophilic attack mechanism", as Ti-18O-18O-Ti.”
Nakamura 和 Nakato - 2004 - Primary intermediates of oxygen photoevolution rea DOI: 10.1021/ja0388764CCC -
Hydroxyl (O-H) tillid 1,0
“Obtained Wavenumber Reference Wavenumber Functional Group/Fingerprint ObtainedWavenumber ReferenceWavenumber FunctionalGroup/Fingerprint cm-1 cm-1 2965.11 ±3000 (Strong & Board) -COOH (O-H Stretching) 2965.11cm-1 ±3000cm-1 -COOH(O-HStretchi”
Validation of the Developed Zero-Order Infrared Spectrophotometry Method for Qualitative and Quantitative Analyses of Tranexamic Acid in Marketed Tablets DOI: 10.3390/molecules26226985 -
Acetate tillid 1,0
“The vibration peak at ~770 is due to the O = C-O deformation [20], while cm-1 the vibration peak at ~1342 is due to the C-H bending vibrations of formate ions (HCOO-)”
Proton-Conducting Biopolymer Electrolytes Based on Carboxymethyl Cellulose Doped with Ammonium Formate DOI: 10.3390/polym14153019 -
Alkyl C-H tillid 1,0
“Technora displays extra peaks due to the 3-4' POP cm-1 sequences: the peak located at ~1264 is related to the C-O vibration of the ether cm-1 function, and the peak at ~770 is related to C-H deformation of meta-substituted aromatic rings [4”
Derombise 等 - 2009 - Degradation of Technora aramid fibres in alkaline DOI: 10.1016/j.polymdegradstab.2009.07.021 -
Acetate tillid 1,0
“Technora displays extra peaks due to the 3-4' POP sequences: the peak cm-1 cm-1 located at ~1264 is related to the C-O vibration of the ether function, and the peak at ~770 is”
Influence of finish treatment on the durability of aramid fibers aged under an alkaline environment DOI: 10.1002/app.31534 -
Urethane tillid 1,0
“The peak at 770 is attributed to the bending vibration peak in vibration peak in the carbamate formed by the reaction.”
The Effect of Glycidyl Azide Polymer Grafted Tetrafunctional Isocyanate on Polytriazole Polyethylene Oxide-Tetrahydrofuran Elastomer and its Propellant Properties DOI: 10.3390/polym12020278 -
Acetate tillid 1,0
“The presence of sharp peaks at 1221, 1104, 770 cm-1 denotes the C-O C-Ostretchingcorrespondingtoalcoholgroups[18,19].”
Manufacturing and Characterization of Novel Electrospun Composite Comprising Polyurethane and Mustard Oil Scaffold with Enhanced Blood Compatibility DOI: 10.3390/polym9050163 -
C-O single bond tillid 1,0
“For the HSPC spectrum, the band at 717 was ascribed to the cm-1 O-C-C-N+ stretch of the skeleton in the gauche conformation, and the band at 770 cm-1 O-C-C-N+ v(C-N) trans-conformation was caused by stretch of in the [52].”
Mechanism Study on Nanoparticle Negative Surface Charge Modification by Ascorbyl Palmitate and Its Improvement of Tumor Targeting Ability DOI: 10.3390/molecules27144408
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