What absorbs at 955 cm⁻¹ in an FTIR spectrum?
A band near 955 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
Risposta rapida
A band near 955 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.
Possibili assegnazioni di gruppi funzionali
| Gruppo funzionale | Fatti di supporto | Fonti citate | Affidabilità massima |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 8 | 8 | 1,0 |
| Silicon (Si) | 8 | 7 | 1,0 |
| Hydroxyl (O-H) | 6 | 5 | 1,0 |
| Silanol (Si-OH) | 4 | 4 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 2 | 1,0 |
| Methacrylate | 3 | 2 | 1,0 |
| C-O single bond | 3 | 2 | 1,0 |
| Acetate | 3 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 0 | 1,0 |
La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.
Materiali possibili
| Materiale | Picchi di supporto | Gruppi sovrapposti | Fonti citate |
|---|---|---|---|
| silica | 955, 1100, 1080 | Silicon-oxygen (Si-O), Silicon (Si), Hydroxyl (O-H) | 2 |
| MWCNT | 955, 2876, 1430 | Hydroxyl (O-H) | 1 |
I materiali vengono mostrati solo quando lo stesso pool di letteratura supporta questa banda e almeno un picco caratteristico aggiuntivo.
Logica dello spettro
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 955 cm⁻¹ is usually not enough for material identification by itself.
Utilizzo nel mondo reale
Questo tipo di richiesta è comune nell＇identificazione dei polimeri, nello screening di plastiche sconosciute, nella risoluzione dei problemi di controllo qualità, nella verifica dei materiali riciclati e nella revisione dell＇assegnazione dei picchi supportata dalla letteratura.
Errori comuni
- Trattare una banda isolata come prova di un materiale senza verificare almeno uno o due picchi di supporto.
- Ignorando la sovrapposizione: più gruppi funzionali possono contribuire vicino allo stesso numero d＇onda.
- Saltare la convalida quando additivi, miscele, ossidazione o contaminazione possono distorcere lo spettro.
Consiglio di verifica
Quando permangono ambiguità, convalida l＇ipotesi con DSC, GC-MS o TGA, specialmente per miscele, campioni degradati e polimeri caricati.
Letteratura dietro queste assegnazioni
-
Alkene (C=C) affidabilità 1,0
“cm-1 The characteristic bands at 955, 773 and 620 are assigned to C=C in-plane bending and C-H”
Highly Biological Active Antibiofilm, Anticancer and Osteoblast Adhesion Efficacy from MWCNT/PPy/Pd nanocomposite DOI: 10.1016/j.apsusc.2017.10.142 -
affidabilità 1,0
“A weak andbroadbandat955cm-1 hybridized S 3p states into the 3d states of the ferric iron (Okude wasassignedto waterlibrationalmodes et al., 1999).”
Vibrational, X-ray absorption, and Mössbauer spectra of sulfate minerals from the weathered massive sulfide deposit at Iron Mountain, California DOI: 10.1016/j.chemgeo.2011.03.008 -
C c single bond affidabilità 1,0
“response of DNA in the control cells is charac- (PO terized by the components at ~1236 cm-1 2antisymmetric stretching), 1170 cm-1 (sugarphosphate backbone vibration), 1083 cm-1 (PO symmetric stretching), and 966 cm-1with 2- (C-C stretching”
Ami 等 - 2014 - Role of water in chromosome spreading and swelling DOI: 10.4081/ejh.2014.2330 -
C-O single bond affidabilità 1,0
“Moreover, three peaks generally observed cm-1, cm-1 cm-1, alkoxy-derived silica gels are visible at 1385 cm-1, 955 cm-1 and at 570 cm-1, which are due to residual in alkoxy-derived silica gels are visible at 1385 955 and at 570 which are du”
Synthesis of Bioactive Chlorogenic Acid-Silica Hybrid Materials via the Sol–Gel Route and Evaluation of Their Biocompatibility DOI: 10.3390/ma10070840 -
Silicon (Si) affidabilità 1,0
“The polymer cm-1, cm-1 vibration appeared unmodified at 1728 whereas silica bands at 1080 and 460 CO stretching vibration appeared unmodified at 1728 cm-1, whereas silica bands at 1080 cm-1 due to stretching and bending of Si-O-Si, as well”
Antibacterial and Cytotoxic Silica-Polycaprolactone- Chlorogenic Acid Hybrids by Sol–Gel Route DOI: 10.3390/molecules28083486 -
affidabilità 1,0
“The bands at 955 cm-1 cm-1 (S-1) and 966 (S-28) belong to Si-O lattice vibrations, while the bans at 878 (S-1)”
Colovic 等 - 2013 - Creating of Highly Active Calcium-Silicate Phases DOI: 10.2298/SOS1303341C -
Silicon (Si) affidabilità 1,0
“Bands around 955 may also act as an indicator for specific surface area (SSA) as they are attributed to the asymmetric vibration of Si-OH.”
Comparing amorphous silica, short-range-ordered silicates and silicic acid species by FTIR DOI: 10.1038/s41598-022-15882-4 -
Acetate affidabilità 1,0
“→ 03 Stretching of CH 2881 2877 and stretching of C-COO 955 04 Rocking of CH3 Rocking of CH3 and stretching of C-COO and characteristic peak 05 908”
Effects of Amphiphilic Chitosan on Stereocomplexation and Properties of Poly(lactic acid) Nano-biocomposite DOI: 10.1038/s41598-018-22281-1
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