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
Kiire vastus
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.
Võimalikud funktsionaalrühmade määramised
| Funktsionaalrühm | Toetavad faktid | Tsiteeritud allikad | Kõrgeim usaldusväärsus |
|---|---|---|---|
| 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 |
Reiting kajastab kogunenud kirjanduslikke tõendeid, mitte ühte autoriteetset reeglit. Kinnitage alati oma proovi kontekstis.
Võimalikud materjalid
| Materjal | Toetavad piigid | Kattuvad rühmad | Tsiteeritud allikad |
|---|---|---|---|
| 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 |
Materjale kuvatakse ainult siis, kui sama kirjanduse kogum toetab seda riba ja vähemalt ühte täiendavat iseloomulikku piiki.
Spektri loogika
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.
Reaalse maailma kasutus
Seda tüüpi päring on tavaline polümeeri tuvastamisel, tundmatu plasti sõeluuringul, kvaliteedikontrolli probleemide lahendamisel, ringlussevõetud materjali kontrollimisel ja kirjandusel põhineval piirkinnituste ülevaatel.
Levinud vead
- Ühe isoleeritud riba käsitlemine materjali tõendina ilma vähemalt ühte või kahte toetavat piiki kontrollimata.
- Ülekattumise ignoreerimine: mitu funktsionaalrühma võivad anda panuse sama lainearvu lähedal.
- Valideerimise vahelejätmine, kui lisandid, segud, oksüdatsioon või saastumine võivad spektrit moonutada.
Kontrollimise nõuanne
Kui ebakindlus püsib, kinnitage hüpotees DSC, GC-MS või TGA abil, eriti segude, lagunenud proovide ja täidetud polümeeride puhul.
Nende määramiste taga olev kirjandus
-
Alkyl C-H usaldusväärsus 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 usaldusväärsus 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 usaldusväärsus 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 usaldusväärsus 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) usaldusväärsus 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 usaldusväärsus 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 usaldusväärsus 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 usaldusväärsus 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
Kas teil on selle ribaga spekter?
Laadige üles oma FTIR spekter ja saage sekunditega täielik tõlgendusaruanne — piikide määramised kirjandusviidetega, raamatukogu vasted ja usaldusväärsusega hinnatud tõendite ahel.