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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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IR Spectroscopy: Molecular Vibration Overview01:24

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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...
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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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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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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Laminar Flow Infrared Spectroelectrochemistry.

Linlin Liu1, Nan Jia1, Ian Burgess2

  • 1Département de Chimie, Université Laval, Québec G1V 0A6, Canada.

Analytical Chemistry
|October 12, 2024
PubMed
Summary
This summary is machine-generated.

We developed laminar flow spectroelectrochemistry (LF-SEC), a novel technique combining electrochemistry and spectroscopy on a single chip. This method precisely monitors chemical reactions, offering new insights into molecular behavior and enabling portable, high-throughput studies.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Electrochemistry

Background:

  • Traditional spectroelectrochemistry (SEC) faces limitations due to integrated electrode and optical components.
  • Optimizing both electrochemical and spectroscopic functionalities simultaneously is challenging.

Purpose of the Study:

  • To introduce and validate a novel lab-on-chip platform for mid-infrared spectroelectrochemistry (SEC).
  • To physically separate electrochemical and spectroscopic elements for enhanced performance.
  • To enable real-time monitoring of chemical reactions with high precision.

Main Methods:

  • Development of a laminar flow spectroelectrochemistry (LF-SEC) system.
  • Integration of deterministic laminar flow for precise solution transport.
  • Utilizing attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy with a scanning aperture system.
  • Optimization using a ferricyanide/ferrocyanide redox pair and galvanostatic control.

Main Results:

  • Successful validation of electrochemical functionality and spectroscopic calibration.
  • Demonstration of monitoring ascorbic acid (vitamin C) oxidation in the presence of interfering molecules.
  • Observation of reaction pathway switching influenced by molecular availability.
  • Quantitative correlation established between FTIR data and reaction rates.

Conclusions:

  • LF-SEC offers a distinct advantage over traditional SEC by preserving optimal properties of electrodes and ATR elements.
  • The technique allows for spectroscopic monitoring of individual electrodes.
  • LF-SEC provides a powerful tool for studying complex reactions, with potential for portable and high-throughput applications.