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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.
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,...
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Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
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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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High-Performance Liquid Chromatography: Types of Detectors01:15

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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Water-Soluble Poly(p-aryleneethynylene)s: A Sensor Array Discriminates Aromatic Carboxylic Acids.

Jinsong Han1, Benhua Wang1, Markus Bender1

  • 1Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.

ACS Applied Materials & Interfaces
|July 15, 2016
PubMed
Summary

A novel chemical tongue using poly(p-aryleneethynylene)s (PAEs) and their complexes accurately identifies 21 acid derivatives. This fluorescence-based sensor achieves 100% accuracy in distinguishing these compounds in aqueous solutions.

Keywords:
aromatic carboxylic acidchemical tongueconjugated polymerlinear discriminant analysissensor

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Chemical Sensing

Background:

  • Developing selective sensors for organic acids is crucial for environmental and biological monitoring.
  • Poly(p-aryleneethynylene)s (PAEs) exhibit fluorescence properties sensitive to their environment.
  • Discrimination of structurally similar compounds like benzoic and phenylacetic acid derivatives presents a significant analytical challenge.

Purpose of the Study:

  • To design and evaluate a "chemical tongue" sensor array for discriminating 21 benzoic and phenylacetic acid derivatives in aqueous solutions.
  • To investigate the fluorescence modulation mechanism of PAEs for sensing applications.
  • To determine the reliability and accuracy of the sensor array using linear discriminant analysis (LDA).

Main Methods:

  • Fabrication of a chemical tongue comprising 11 elements: four poly(p-aryleneethynylene)s (PAEs) at pH 7 and pH 13, and seven electrostatic complexes of PAEs at pH 7.
  • Utilizing fluorescence spectroscopy to monitor the response of the PAE-based sensor elements.
  • Applying linear discriminant analysis (LDA) for data processing and classification of the acid derivatives.

Main Results:

  • The individual PAE components and the electrostatic complexes demonstrated high discrimination reliability: 92% (PAEs at pH 7), 95% (PAEs at pH 13), and 99% (complexes at pH 7).
  • The fluorescence modulation mechanism involved both quenching and fluorescence turn-on.
  • A comprehensive sensor field incorporating all 14 elements achieved 100% accuracy in discriminating all 21 acid derivatives via LDA.

Conclusions:

  • The developed poly(p-aryleneethynylene)-based chemical tongue is a highly effective platform for the sensitive and selective detection of benzoic and phenylacetic acid derivatives.
  • The combination of PAEs and their electrostatic complexes significantly enhances sensing capabilities, enabling complete discrimination.
  • This approach offers a promising strategy for complex mixture analysis in aqueous environments.