What absorbs at 663 cm⁻¹ in an FTIR spectrum?

Risposta rapida

A band near 663 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 663 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

• Thiol affidabilità 1,0

  “The second silicate bands are 4 cm-1 in C-S-H broadly characterized as O-Si-O deformation or bending modes, which occur near 451 470cm-1 cm-1 667cm-1 and in C-A-S-H and the band 663 or is due to Si-O-Si bending vibrations.”

  He 等 - 2011 - Morphology and Structure of Aluminum Substituted C DOI: 10.4028/www.scientific.net/AMR.287-290.1193
• affidabilità 1,0

  “Peak at 663 Tensile tests were performed according to ASTM D638 corresponds to the C-Cl stretching in PVC chains.”

  Ibrahim 等 - 2011 - A study of poly vinyl chloridepoly(butylene adipa DOI: 10.1007/s10965-010-9486-1
• Carbon bromine affidabilità 1,0

  “The intense bands situated at about 663 and 1025cm-1 of wavelength were assigned to the stretching vibrational movement of C-Br and”

  Jing 等 - 2019 - Biosynthesis of copper oxide nanoparticles and the DOI: 10.1016/j.jphotobiol.2019.111557
• Amide affidabilità 1,0

  “pneumonia were observed by SEM based on a method reported 663cm-1 C-N C-Br ∼105CFU/mL are due to and stretching vibrational motions.”

  Biologically synthesized copper oxide nanoparticles enhanced intracellular damage in ciprofloxacin resistant ESBL producing bacteria DOI: 10.1016/j.micpath.2018.12.017
• Hydroxyl (O-H) affidabilità 1,0

  “cm-1 Analysis of deuterated samples [50] shows that the relatively sharp peak at 663 is due to the O-H Analysis of deuterated samples [50] shows that the relatively sharp peak at 663 cm-1 is due to the Olibration (see inset in Figure 4).”

  Baldassarre 等 - 2020 - Crystal Chemistry and Luminescence Properties of E DOI: 10.3390/cryst10040250
• affidabilità 1,0

  “The strong bonds between 981.1 cm-1 and 662.7 cm-1 stretching with halogen groups.”

  Synthesis and Characterization of Sulfur Nanoparticles of Citrus limon Extract Embedded in Nanohydrogel Formulation: In Vitro and In Vivo Studies DOI: 10.3390/gels9040284
• affidabilità 1,0

  “is triuoroacetate electrostatic interaction of lanthanum and triarticle cm-1 Si-O-Si La-O-Si 663 assigned to & bond vibrations, chloroacetate with the silica support material, which converts Article.”

  Silica supported lanthanum trifluoroacetate and trichloroacetate as an efficient and reusable water compatible Lewis acid catalyst for synthesis of 2,4,5-triarylimidazoles via a solvent-free green approach DOI: 10.1039/d2ra07021a
• Hydroxyl (O-H) affidabilità 1,0

  “Analysis of deuterated samples [56] shows cm-1 that the relatively sharp peak at 663 is due to the O-H libration.”

  Paterlini 等 - 2020 - Characterization and Luminescence of Eu3+- and Gd3 DOI: 10.3390/cryst10090806