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Related Concept Videos

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There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
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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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A novel organic chromo-fluorogenic optical sensor for detecting chromium ions.

Sayed M Saleh1, Reham Ali1, Azizah Algreiby1

  • 1Department of Chemistry, College of Science, Qassim University, Buraidah, 51452, Saudi Arabia.

Heliyon
|September 23, 2024
PubMed
Summary

A novel optical sensor film was developed for detecting trivalent chromium ions (Cr(III)). This sensor utilizes a diethyl 3,4-diaminothieno[2,3-b]thiophene-2,5-dicarboxylate (3D) probe, offering high sensitivity and selectivity for essential micronutrient monitoring.

Keywords:
ChromiumCoordination reactionsEnvironmental monitoringFluorescenceTransition metalsWater contamination

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Trivalent chromium ion (Cr(III)) is an essential micronutrient vital for human physiological processes.
  • Accurate sensing of Cr(III) is crucial for clinical analysis, environmental monitoring, and industrial applications.
  • Existing methods for Cr(III) detection may lack the required sensitivity or selectivity for certain applications.

Purpose of the Study:

  • To develop and design a novel, highly sensitive optical sensor film for the detection of Cr(III) ions.
  • To investigate the sensing mechanism based on fluorescence enhancement upon Cr(III) complexation.
  • To evaluate the sensor's performance characteristics, including sensitivity, selectivity, and detection limit.

Main Methods:

  • A novel optical sensor film was fabricated using a diethyl 3,4-diaminothieno[2,3-b]thiophene-2,5-dicarboxylate (3D) probe.
  • The optical properties of the 3D probe and its complex with Cr(III) were characterized using fluorescence spectroscopy.
  • The sensor's response was studied under physiological pH conditions (pH 7.4).

Main Results:

  • The 3D probe exhibited distinct fluorescence emission at 460 nm upon excitation at 354 nm.
  • Complexation with Cr(III) ions resulted in a 2:1 (metal:ligand) ratio, leading to fluorescence enhancement and a red-shift to 480 nm.
  • The sensor demonstrated high sensitivity with a low detection limit of 0.37 × 10⁻³ μM, exceptional selectivity, and a binding constant of 1.40 × 10⁶ for Cr(III).

Conclusions:

  • The developed optical sensor film based on the 3D probe offers a highly sensitive and selective method for Cr(III) detection.
  • The fluorescence enhancement mechanism, attributed to the inhibition of photo-induced electron transfer (PET) by Cr(III)-3D complex formation, underpins the sensor's efficacy.
  • This sensor provides a promising tool for Cr(III) monitoring in various applications, including environmental and clinical analyses.