What absorbs at 969 cm⁻¹ in an FTIR spectrum?
A band near 969 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 969 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 |
|---|---|---|---|
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Nucleic acid | 2 | 1 | 1,0 |
| Alkyl C-H | 2 | 1 | 1,0 |
| Silanol (Si-OH) | 2 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Bromine | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Silicate | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 0 | 1,0 |
| Hydroxyl (O-H) | 1 | 0 | 1,0 |
La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.
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 969 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
-
Alkyl C-H affidabilità 1,0
“The peak at 969 assigned to trans -CH=CHbending vibration from 219 phospholipid among different animal species (Che Man, Z.”
Gao 等 - 2021 - Complementarity of FT-IR and Raman spectroscopies DOI: 10.1016/j.foodchem.2020.128754 -
Silicon (Si) affidabilità 1,0
“The absorption band at 953 and is designated to the stretching 857cm-1 frequency of Sr-O bond and Si-O stretching frequency appears at in the prepared silicate materials is due to the asymmetric 969cm-1 stretching frequency of Si-O bond in”
Down-conversion characteristics of Eu3+ doped M2Y2Si2O9 (M = Ba, Ca, Mg and Sr) nanomaterials for innovative solar panels DOI: 10.1016/j.pnsc.2019.07.003 -
Acetate affidabilità 1,0
“This is the case of the bands at 1208 and 1126 cm-1 (νas C-O-C, ring), and 1024 and 969 cm-1 (ν C-O, C-C) in the α-ring, respectively.”
Optimization and Characterization of a Novel Exopolysaccharide from Bacillus haynesii CamB6 for Food Applications DOI: 10.3390/biom12060834 -
C c single bond affidabilità 1,0
“The values cm-1(esterC-O-C g-1) DH (lactoneC-O-Casymmetricbend),1214 of the eutectic melting enthalpy (J for a given cm-1 asymmetric bend), 1074 (lactone C-C symmetric dispersions, determined by integration of the eutectic peak cm-1(esterC-”
Gorniak 等 - 2016 - Thermal, spectroscopic and dissolution studies of DOI: 10.1007/s10973-016-5279-z -
Nucleic acid affidabilità 1,0
“cm21 cm21 band at 969 and 935 are assigned to DNA backbone”
Jangir 等 - 2013 - Role of Minor Groove Width and Hydration Pattern o DOI: 10.1371/journal.pone.0069933 -
Bromine affidabilità 1,0
“cm-1 cm-1 The negative band at 976 and the positive band at 969 in Figure 9b were assigned to the cm-1 N-D in-plane bending vibrations of BR and BR K, respectively [34].”
Kawanabe 和 Kandori - 2009 - Photoreactions and Structural Changes of Anabaena DOI: 10.3390/s91209741 -
Amide affidabilità 1,0
“cm-1, grown MAPbBr single crystal is consistent with Prominent peaks are at 969 3 cm-1, cm-1, cm-1, 1477 1584 and 3165 which can be attributed to the C-N stretch, symmetric 5 3+”
Origin of Defects and Positron Annihilation in Hybrid and All-Inorganic Perovskites DOI: 10.1021/acs.chemmater.1c03540 -
Acetate affidabilità 1,0
“Candida krusei Candida glabrata Candida parapsilosis Candida albicans Species and and Preparation Prominent Bands in PC2 Loadings Plots (cm-1) (νC-O) 1166-C-O stretch of Method Carbohydrates-Polysaccharides Candida krusei and Candida Specie”
Influence of the Sample Preparation Method in Discriminating Candida spp. Using ATR-FTIR Spectroscopy DOI: 10.3390/molecules25071551
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