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Updated: Jul 17, 2025

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

An Azomethine-H-Based Fluorogenic Sensor for Formic Acid.

Mark Potter¹, Suman Debnath¹, Marcus W Drover¹

¹Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada.

ACS Applied Materials & Interfaces

|September 6, 2023

Summary

This summary is machine-generated.

Azomethine-H dye effectively detects formic acid (FA) vapor. This new sensor shows increased luminescence with FA, enabling sensitive detection down to 0.4 ppb, paving the way for organic acid sensing.

Keywords:

Formic acid sensor azomethine-H fluorogenic sensor gelatin thin films xerogels

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Published on: January 4, 2016

Area of Science:

Analytical Chemistry
Materials Science
Chemical Sensing

Background:

Formic acid (FA) is a crucial C1 feedstock and a source of hydrogen gas (H2).
Developing efficient FA detection methods is vital for promoting cleaner energy alternatives.
Azomethine-H (Az-H) dye is a commercially available compound with interesting photophysical properties.

Purpose of the Study:

To investigate the potential of azomethine-H (Az-H) dye for formic acid (FA) sensing.
To explore FA detection in both solution and solid-state formats.
To develop a highly sensitive fluorogenic sensor for FA vapor.

Main Methods:

Solution studies involving absorbance and luminescence measurements of Az-H in the presence of FA.
Probing Az-H/FA interactions using 1H NMR spectroscopy to understand conformational changes.
Incorporation of Az-H into a gelatin matrix to create a solid-state sensor for FA vapor detection.

Main Results:

Formic acid quenched the absorbance and luminescence of Az-H in solution, indicating an interaction.
FA attenuated the (E)-to-(Z) conformational change of Az-H, suggesting hydrogen bonding.
The solid-state Az-H/gelatin sensor exhibited a FA-dependent increase in luminescence, with a detection limit of approximately 0.4 ppb FA vapor.

Conclusions:

Azomethine-H dye can be utilized for sensitive detection of formic acid in both solution and solid states.
The observed fluorescence enhancement in the solid-state sensor is attributed to FA-induced isomerization.
This work presents a promising step towards practical sensors for organic acids in various chemical environments.