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In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.
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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and...
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Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the...
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In aldehydes, the hydrogen atom connected to the carbonyl carbon helps distinguish aldehydes from other carbonyl compounds using ¹H NMR spectroscopy. The closeness of aldehydic hydrogen to the electrophilic carbonyl carbon highly deshields the hydrogen atom causing its signal to appear around 10 ppm in the ¹H NMR spectra. α hydrogens split the aldehydic proton signal, which helps identify the number of α hydrogens in the molecule. For instance, one α hydrogen creates a...
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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Infrared Reflection-Absorption Spectroscopy of α-Hydroxyacids at the Water-Air Interface.

Alexandra M Deal1, Veronica Vaida1

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|October 26, 2022
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Summary
This summary is machine-generated.

Alpha-hydroxyacids at water surfaces exhibit complex hydrogen bonding influenced by tail length. Molecular ordering and orientation are dictated by both polar headgroup and hydrophobic tail interactions.

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Area of Science:

  • Environmental Chemistry
  • Surface Science
  • Spectroscopy

Background:

  • Organic molecules like alpha-hydroxyacids are common at water-air interfaces.
  • Their interfacial structure and ordering, especially concerning hydrophobic tail length, remain under-investigated.

Purpose of the Study:

  • To investigate the structure and ordering of alpha-hydroxyacids at water-air interfaces.
  • To determine the impact of hydrophobic tail length on interfacial behavior.

Main Methods:

  • Utilized infrared reflection-absorption spectroscopy (IRRAS).
  • Studied lactic acid (1C), 2-hydroxyoctanoic acid (6C), and 2-hydroxystearic acid (16C).
  • Analyzed vibrational features to understand headgroup-water interactions and tail ordering.

Main Results:

  • Alpha-hydroxyacids form complex hydrogen bonds at the interface, influenced by tail length.
  • Molecular ordering increases with hydrophobic tail length and surface coverage.
  • The alpha-hydroxyl group induces a tilted orientation, even at high coverages.

Conclusions:

  • Hydrophobic tail length and surface coverage significantly impact alpha-hydroxyacid ordering and orientation.
  • Interfacial behavior is governed by a interplay between polar headgroup and hydrophobic tail.
  • Findings are crucial for understanding interfacial chemistry and organic coatings on water.