What absorbs at 1221 cm⁻¹ in an FTIR spectrum?
A band near 1221 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 1221 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 | 5 | 5 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 0,7 |
Reiting kajastab kogunenud kirjanduslikke tõendeid, mitte ühte autoriteetset reeglit. Kinnitage alati oma proovi kontekstis.
Võimalikud materjalid
| Materjal | Toetavad piigid | Kattuvad rühmad | Tsiteeritud allikad |
|---|---|---|---|
| PET | 1221, 1408, 800 | Methacrylate, Methoxy (OCH3), C-O single bond | 1 |
| collagen | 1221, 1408, 1660 | Amide, Methacrylate, Methoxy (OCH3) | 1 |
| polyurethane | 1221, 2270, 1700 | Methacrylate, C-O single bond, Methoxy (OCH3) | 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 1221 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
-
usaldusväärsus 1,0
“Explicit assignment in text.”
A facile synthesis of ZSM-11 zeolite particles using rice husk ash as silica source DOI: 10.1016/j.matlet.2012.07.079 -
Metal oxygen usaldusväärsus 1,0
“cm-1) ν 42-), pattern, three intense bands are observed in the 54 (<100 allowing the observation of (SO 75 2 significantly antisymmetric stretching region at 1221, 1134 and 55 Fe-O, H 2O and lattice modes, which overlap 76 cm-1.”
Ventruti 等 - 2016 - Hydrogen bond system and vibrational spectroscopy DOI: 10.1127/ejm/2016/0028-2571 -
Amide usaldusväärsus 1,0
“Bands depicting amide II were found at 1517, cm-1, 1586, 1514, and 1522 whereas amide III bands were registered at 1221, 1219, 1227,”
Comparison of Different Methods for Spongin-like Collagen Extraction from Marine Sponges (Chondrilla caribensis and Aplysina fulva): Physicochemical Properties and In Vitro Biological Analysis DOI: 10.3390/membranes11070522 -
Phosphate (PO4) usaldusväärsus 1,0
“Indeed, P-O-C observed at, respectively, 1030 and 1221cm-1 new peak appeared at and could be attributed to the stretching vibration of P=O.”
Dardouri 等 - 2015 - Aminoalkylated Merrifield Resins Reticulated by Tr DOI: 10.1155/2015/782841 -
usaldusväärsus 1,0
“There are three important vibrations of collagen molecules: at 1644 ν(C=O) (amide I), 1541 cm-1 attributed to δ(N-H) and ν(C-N) (amide II) and at 1221 cm-1 cm-1 cm-1 ν(C=O) ν(C=O) (amide I), 1541 cm-1 attributed to δ(N-H) and ν(C-N) (amide”
Drobota 等 - 2020 - Preparation and Characterization of Electrospun Co DOI: 10.3390/ma13183961 -
C-O single bond usaldusväärsus 1,0
“Published cm(cid:3)1,35,39 cm(cid:3)1 band).35,38 presence of a covalent CH vibrations at 1459, 1368, and 1309 amide I (ester The peak at 1531 shows 2 cm(cid:3)1,35,38 cm(cid:3)1,35 is C-O-C band) at 1221 that the urethane band increases wi”
Polyurethane/58S bioglass nanofibers: synthesis, characterization, and in vitro evaluation DOI: 10.1039/c5ra24786a -
usaldusväärsus 1,0
“2.24 - 2.58 (m, 2 H, 4) 2.61 - 2.95 (m, 2 H, 3) 3.61 (ddt, C-O carboxylic acids 1188 J=2.33, 1.58, 0.75, 0.75 Hz, 2 H, 6) 4.44 - 4.46 (s, 1 Methylene twist 1298, 1275 H,10) 6.57 (d, J=5.10 Hz, 1 H, 7) 6.97 (td, J=7.50, 1.20 Chlorophenyl C-C”
Housheh 等 - 2015 - GCMS, FTIR and NMR Studies for the Identification DOI: 10.5530/ijper.49.4.1 -
Hydroxyl (O-H) usaldusväärsus 1,0
“1221cm-1 cm-1 and 1104 CO stretch corresponding to the alcohol group (Jaganathan et al.”
Jaganathan 等 - 2019 - Blood compatibility assessments of electrospun pol DOI: 10.1590/0001-3765201920190018
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.