What absorbs at 1298 cm⁻¹ in an FTIR spectrum?

Risposta rapida

A band near 1298 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

La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.

Materiali possibili

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 1298 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

• Amide affidabilità 1,0

  “to (ii) the band corresponding to the C-N stretching is present at 1298 (iii) the bands to calculate the copolymer composition but reveals that aniline monomer units are present in the”

  Bongiovanni Abel 等 - 2019 - Synthesis of a Smart Conductive Block Copolymer Re DOI: 10.3390/polym11111744
• affidabilità 1,0

  “cm-1 While the peaks at 1297.6 and 1240.8 correspond to the N-H bending and the asymmetric cm-1 C-N stretching of the benzenoid ring, respectively.”

  Li 等 - 2013 - Synthesis and Microwave Absorption Characteristics DOI: 10.4028/www.scientific.net/AMM.327.53
• Lewis acid site affidabilità 1,0

  “After the introduction 3 Lewis acid sites immediately disappeared upon exposure to NO, of NH 3, a broad feature with peaks at 1298, 1387, and 1465 that participates in the suggesting that it is this type of NH cm-1 cm-1 appeared, and the pe”

  Pena 等 - 2004 - Identification of surface species on titania-suppo DOI: 10.1021/jp0313122
• Amide affidabilità 1,0

  “cm-1 cm-1 plan, 802 corresponds to para di-substituted ring, 1119 is due to delocalization of 7 cm-1 cm-1 electrons in aromatic ring, 1298 corresponds to C - N stretching vibration, 1490 due cm-1”

  Antistatic and Dielectric properties of one-dimensional Al2+:Nd2O3 nanowire doped polyaniline nanocomposites for electronic application DOI: 10.1016/j.sna.2018.07.018
• Amide affidabilità 1,0

  “The dotted blue lines crossing the peak at ~1153 is for asymmetric cm-1 stretch of C-O-C, and that at 1298 is for the C-N stretching vibration of type I amine.”

  Awadallah-F 和 Al-Muhtaseb - 2019 - Influence of Chitosan Addition on Resorcinol-Forma DOI: 10.3390/app9214582
• Aromatic ring affidabilità 1,0

  “cm-1/1298 cm-1 cm-1 1323 doublet and 1151 peak were assigned to the asymmetric and 318 symmetric stretching of the aromatic sulfone chromophore, respectively [25].”

  Garcia-Ivars 等 - 2014 - Development of fouling-resistant polyethersulfone DOI: 10.1016/j.seppur.2014.07.056.
• Carboxyl (COOH) affidabilità 1,0

  “Figure 1C shows the typical absorption bands of sodium alginate, mainly the O-H stretching at 3424 cm-1, pyranoid ring (six-membered ring) C-H stretching at 2903 and 2932 cm-1, COO asymmetric stretching at 1595 cm-1, COO symmetric stretchin”

  Characteristics and Preparation of Designed Alginate-Based Composite Scaffold Membranes with Decellularized Fibrous Micro-Scaffold Structures from Porcine Skin DOI: 10.3390/polym13203464
• Acetate affidabilità 1,0

  “The band located at 1298 cm-1 3 originates from the asymmetric valence C-O-C vibrations of HEMA and is also present in the polymer spectrum.”

  Influence of Dimethacrylate Monomer on the Polymerization Efficacy of Resin-Based Dental Cements—FTIR Analysis DOI: 10.3390/polym14020247