Hvad absorberer ved 1736 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1736 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 1736 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 |
|---|---|---|---|
| Carbonyl (C=O) | 50 | 41 | 1,0 |
| Ester | 31 | 30 | 1,0 |
| Carboxyl (COOH) | 28 | 26 | 1,0 |
| Acetate | 28 | 26 | 1,0 |
| Methacrylate | 26 | 24 | 1,0 |
| Amide | 25 | 24 | 1,0 |
| Ketone | 21 | 20 | 1,0 |
| Alkyl C-H | 7 | 7 | 1,0 |
| Carbohydrate | 6 | 5 | 1,0 |
| Methoxy (OCH3) | 5 | 4 | 1,0 |
| C-O single bond | 5 | 4 | 1,0 |
| Lignin | 2 | 2 | 1,0 |
| Fatty acid | 2 | 2 | 1,0 |
| Lipid | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Acetyl | 1 | 1 | 1,0 |
| Imide | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Nitrate | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Aldehyde (CHO) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Urea | 1 | 0 | 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 |
|---|---|---|---|
| ZnO NPs | 1736, 1664, 875 | Acetate | 1 |
| polystyrene | 1736, 1020, 1600 | Acetate, Carbonyl (C=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 1736 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
-
Carboxyl (COOH) tillid 1,0
“NMR studies showed the carboxyl bands, but also featured additional peaks at 1736 and 1134 presence of butyl groups.”
Broderick 等 - 2006 - The characterisation of a novel, covalently modifi DOI: 10.1016/j.jcis.2005.12.026 -
Borate tillid 1,0
“Additionally, changes B-O in the peak profile of the stretching band were observed upon binding, confirming formation of a (cid:24)1736 cm-1 through the IR marker mode at to 1742 depending on the identity of the bound sugar.”
Brewer 等 - 2004 - Infrared detection of a phenylboronic acid termina DOI: 10.1021/la035037m -
Acetate tillid 1,0
“The bands at 2243 and 1736 cm-1 are due to CN stretching and C=O stretching vibrations, Fabrication of Conductive Composite Films”
Cetiner 等 - 2011 - Characterization of Conductive Poly(Acrylonitrile- DOI: 10.1007/s12221-011-0151-z -
Acetate tillid 1,0
“The FTIR cm-1 analysis of synthesis of ZnO NPs using seaweeds showed the bands at 1736 representing C=O cm-1, which were sharper and broader for ZnO carboxylic acid and the strong C-H group bonds at 1023”
An Investigation of the Cytotoxicity and Caspase-Mediated Apoptotic Effect of Green Synthesized Zinc Oxide Nanoparticles Using Eclipta prostrata on Human Liver Carcinoma Cells DOI: 10.3390/nano5031317 -
Ester tillid 1,0
“Hence the cm(cid:3)1 that the peak at (cid:2)1715 is the ester carbonyl formed by the can be attributed to the ester carbonyl peak at 1736 reaction of the anomeric hydroxyl of glucose with the formed by the reaction of the secondary hydroxy”
Galgali 等 - 2007 - Sugar-linked biodegradable polymers Regio-specifi DOI: 10.1016/j.carbpol.2006.06.035 -
Carbon dioxide tillid 1,0
“The tion of SWCNTs to the Type(cid:2)4 blend, a new small peak reduction of O=C=O peak area (A 4) on consecutive cm-1 cm-1) at 1736 and a broad peak (1210-990 cen(cid:2) addition of SWCNT and compatibilizer signifies cm-1 tered at 1088 were”
Khan 等 - 2015 - Morphological characteristics of solution spun nan DOI: 10.1134/S0965545X15060115 -
Carboxyl (COOH) tillid 1,0
“Degree of methylation (DM) 223 cm-1 From [21], it is inferred that the ratio of the area of the band at 1736 224 (corresponding to the number of esterified carboxylic groups) over the sum of the areas 225 cm-1and cm-1 of the bands at 1735 1”
Lefsih 等 - 2016 - Extraction, characterization and gelling behavior DOI: 10.1016/j.ijbiomac.2015.10.046 -
Ester tillid 1,0
“gas41, cm-1, cm-1, cm-1 cm-1 are attributed to hydrogen chloride the peaks near 1736 1264 1106 and 1024 are DOTP42, cm-1 attributed to the ester group ν from the plasticizer and the 671 peak is attributed to the (COOR)”
Synthesis, characterization and thermal behavior of plasticized poly (vinyl chloride) doped with folic acid-modified titanium dioxide DOI: 10.1038/s41598-022-07177-5
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.