What absorbs at 1185 cm⁻¹ in an FTIR spectrum?
A band near 1185 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Hurtigt svar
A band near 1185 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| C-O single bond | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 0,8 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| gelatin | 1185, 1652, 3300 | Methacrylate, Acetate, C-O single bond | 1 |
| polypyrrole | 1185, 1700, 400 | Methacrylate, Acetate | 1 |
| DNA | 1185, 1712, 1660 | Methacrylate, Acetate, C-O single bond | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 1185 cm⁻¹ is usually not enough for material identification by itself.
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
-
Alkyl C-H tillid 1,0
“with a remote attenuated total reflectance (ATR) probe for realmonitoring.17 However, they point out that overlapping time cm-1 C-O-C polymer absorbances at 1185 (asymmetric C-H vibration24) stretching vibration and asymmetric rocking”
Braun 等 - 2006 - Infrared spectroscopic determination of lactide co DOI: 10.1021/ma061922a -
Amide tillid 1,0
“the cm-1 cm-1 peak at 1185 is due to C-N stretching;”
Thakur 和 Lokhande - 2018 - Morphological Modification for Optimum Electrochem DOI: 10.4152/pea.201806377 -
Acetate tillid 1,0
“The band at 1185 cm-1 attributed for C-O stretching vibrations of ether groups results from carboxymethylation of cellulose or ether linkage of cellulose compartment in combination with that arising from the two”
Ahmed 等 - 2021 - STRUCTURAL AND OPTICAL CHARACTERISTICS OF POLY(VIN DOI: 10.4314/bcse.v35i3.12 -
Alkyl C-H tillid 1,0
“1667, 1595 1650, 1620, 1590 H 2O bending 1508, 1458 C-H vibration 1185, 816, 759, 577”
Lacalamita - 2018 - Micro-FTIR and EPMA Characterisation of Charoite f DOI: 10.1155/2018/9293637 -
Phosphate (PO4) tillid 1,0
“In the A-DNA infrared spectrum contains a new band at cm-1 case of nucleic acids, water and hydrated ions neu1185 assigned to the vibrations of deoxyribose tralize electrostatic repulsions between phosphate in the C3′-endo conformation [5],”
Olsztynska-Janus 等 - 2012 - Spectroscopic techniques in the study of human tis DOI: 10.5277/abb120314 -
Acetate tillid 1,0
“deformation of CH was evidenced at peak ~ 1364 At 3 cm-1 cm-1 ~ 1185 is the stretching of C-O-C and at ~ 1031 Statistic analysis”
Paraiso 等 - 2020 - Hibiscus sabdariffa L. extract Characterization ( DOI: 10.9755/ejfa.2020.v32.i1.2059 -
Acetate tillid 1,0
“4 cm-1, cm-1 stretching C=C at 1595 and 1500 stretching C-O at 1185 and bending C-H at 878, 757 5 6”
Spepi 等 - 2016 - Experimental and DFT Characterization of Halloysit DOI: 10.1517/17425247.2016.1169271. -
N h tillid 1,0
“C=S, vibration or N-C-N stretching vibration (1424 C-N, or NH rocking vibration (1185 2”
Synthesis and Characterization of Cu2FeSnS4–Cu2MnSnS4 Solid Solution Microspheres DOI: 10.3390/ma13194440
Har du et spektrum med dette bånd?
Upload dit FTIR-spektrum og få en fuld tolkningsrapport — peak-tildelinger med litteraturhenvisninger, biblioteksmatch og en tillidsvurderet beviskæde — på få sekunder.