Related Experiment Video
Updated: Mar 16, 2026
10:40
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
8.0K
Hydrated forms of fluoroacetic acid: a rotational study
Gang Feng1, Qian Gou, Luca Evangelisti
1School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
Physical Chemistry Chemical Physics : PCCP
|August 12, 2016
Summary
Pulsed jet microwave spectroscopy revealed two distinct shapes of fluoroacetic acid-water adducts. These conformers differ based on the fluoroacetic acid
Area of Science:
- Molecular spectroscopy
- Physical chemistry
- Chemical physics
Background:
- Fluoroacetic acid is a small molecule with potential applications in various chemical processes.
- Understanding the interactions of fluoroacetic acid with water is crucial for its chemical behavior.
- Conformational isomerism plays a significant role in molecular properties and reactivity.
Purpose of the Study:
- To investigate the structural and dynamic properties of fluoroacetic acid-water adducts.
- To identify and characterize different conformers of the 1:1 fluoroacetic acid-water complex.
- To explore the hydrogen bonding interactions within these adducts.
Main Methods:
- Pulsed jet Fourier transform microwave spectroscopy was employed to record high-resolution rotational spectra.
- Spectral analysis was used to assign rotational transitions for different conformers.
- Computational methods may have been used to support spectral assignments and analyze structural features.
Main Results:
- Two distinct conformers of the 1:1 fluoroacetic acid-water adduct were successfully identified and assigned.
- The observed conformers differ in the orientation of the fluoroacetic acid moiety (trans vs. cis).
- The cis conformer of the adduct was observed, unlike the monomeric fluoroacetic acid.
Conclusions:
- The study provides detailed insights into the hydrogen bonding, structure, dynamics, and energetics of the fluoroacetic acid-water adducts.
- The presence of both trans and cis conformers in the adduct highlights the influence of water on fluoroacetic acid's conformational preferences.
- This research contributes to the understanding of intermolecular interactions and conformational analysis in weakly bound complexes.
More Related Videos
Related Concept Videos
01:29Atomic Fluorescence Spectroscopy
1.1K
Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
1.1K
01:28IR and UV–Vis Spectroscopy of Carboxylic Acids
6.0K
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.
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency,...
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency,...
6.0K
01:26Spectroscopy of Carboxylic Acid Derivatives
3.2K
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...
3.2K
01:23Atomic Spectroscopy: Absorption, Emission, and Fluorescence
3.3K
Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
3.3K
01:24IR Spectroscopy: Molecular Vibration Overview
5.7K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
5.7K
01:29IR and UV–Vis Spectroscopy of Aldehydes and Ketones
7.8K
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...
7.8K