What absorbs at 1775 cm⁻¹ in an FTIR spectrum?

Réponse rapide

A band near 1775 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.

Attributions possibles de groupes fonctionnels

Le classement reflète les preuves bibliographiques accumulées, et non une règle faisant autorité. Confirmez toujours dans le contexte de votre échantillon.

Matériaux possibles

Les matériaux sont affichés uniquement lorsque le même ensemble de littérature soutient cette bande et au moins un pic caractéristique supplémentaire.

Logique du spectre

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 1775 cm⁻¹ is usually not enough for material identification by itself.

Utilisation réelle

Ce type de requête est courant dans l＇identification des polymères, le criblage des plastiques inconnus, le dépannage du contrôle qualité, la vérification des matériaux recyclés et l＇examen de l＇attribution des pics appuyée par la littérature.

Erreurs courantes

• Traiter une bande isolée comme preuve d＇un matériau sans vérifier au moins un ou deux pics de support.
• Ignorer le chevauchement : plusieurs groupes fonctionnels peuvent contribuer près du même nombre d＇onde.
• Sauter la validation lorsque des additifs, des mélanges, l＇oxydation ou la contamination peuvent déformer le spectre.

Conseil de vérification

Lorsque l＇ambiguïté persiste, validez l＇hypothèse avec DSC, GC-MS ou TGA, en particulier pour les mélanges, les échantillons dégradés et les polymères chargés.

Bibliographie derrière ces attributions

• Carboxyl (COOH) confiance 1,0

  “Spectrum FTIR Carboxymethyl kappa-carrageenan Based on the FTIR spectrum, it appears that some of the hydroxyl groups have been replaced with carboxyl cm-1 cm-1 and 1417 confirming groups, indicated by the appearance of absorption peaks at”

  The capability of nanomagnetite carboxymethyl kappa-carrageenan coated to adsorp metal ions DOI: 10.1063/5.0000680
• Acetate confiance 1,0

  “The absence of the vibration band located around 1775 is attributed to the elongated vibrations of the specific C=O bond of the hemicellulose residues”

  Part A: Biodegradable Bio-Composite Film Reinforced with Cellulose Nanocrystals from Chaetomorpha linum into Thermoplastic Starch Matrices DOI: 10.3390/polym15061542
• Carbohydrate confiance 1,0

  “Sci.2022,12,9645 5of9 and 1775 cm-1 which are attributed to the carbohydrates and O-H stretching vibrations”

  Botanical Origin Assessment of Honey Based on ATR-IR Spectroscopy: A Comparison between the Efficiency of Supervised Statistical Methods and Artificial Intelligence DOI: 10.3390/app12199645
• Hydroxyl (O-H) confiance 1,0

  “cm-1, cm-1, O-H, C=O, C=C, -CH 2, C-O stretching, and C-H bending at 3741.18 1774.84 cm-1, cm-1, cm-1, cm-1, 1689.04 1511.76 1182.03 and 882.79 respectively.”

  Evaluation of Structural and Optical Properties of Graphene Oxide-Polyvinyl Alcohol Thin Film and Its Potential for Pesticide Detection Using an Optical Method DOI: 10.3390/photonics9050300
• Acetate confiance 1,0

  “1153cm(cid:3)1 which the carbonyl stretching vibration of six-membered cyclic (C-O stretching of ester) and (C-N stretching of aliphatic ester).17,18 1760cm(cid:3)1, anhydrides exhibited unique peaks at 1800 and amine and/or C-O stretching”

  DSC-FTIR microspectroscopy used to investigate the heat-induced intramolecular cyclic anhydride formation between Eudragit E and PVA copolymer DOI: 10.1038/pj.2011.15;
• Acetate confiance 1,0

  “The absorption bands observed at 1775 cm-1 and 1716 were attributed to the asymmetric and symmetric stretching of C=O in the imide ring, Polymers2017,9,734”

  Preparation and Evaluation of a Polyimide-Coated Ultrafine Gilt Molybdenum Wire and Its Knitted Mesh Used for Electromagnetic Reflectors DOI: 10.3390/polym9120734
• Alkyl C-H confiance 1,0

  “In the Figure 4 (A) the shows crystalline and 2850 (CH stretching), 1775 (C=O stretchIndian Journal of Pharmaceutical Education and Research | Vol 52 | Issue 4 [Suppl] | Oct-Dec, 2018”

  Udapurkar 等 - 2018 - Diosmin Phytosomes Development, Optimization and DOI: 10.5530/ijper.52.4s.73
• confiance 0,8

  “Attributed to specific vibration of thiophene.”

  Surface Characterization of Modified Electrodes Based on 4-(Azulen-1-yl)-2,6-bis((E)-2-(thiophen-2-yl)vinyl)pyridine DOI: 10.3390/sym14122506