Bismetalloporphyrin-based ISE sensitive to fluoroborate

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Materials Science

Background:

• Development of selective ion-selective electrodes (ISEs) is crucial for accurate chemical analysis.
• Porphyrin-based materials offer unique electronic and structural properties for sensor applications.
• Fluoroborate (BF4-) detection is important in industrial processes like electroplating.

Purpose of the Study:

• To synthesize and characterize mu-oxo-bismetalloporphyrin complexes for fluoroborate sensing.
• To develop and optimize a potentiometric sensor for fluoroborate ion detection.
• To evaluate the sensor's performance, selectivity, and application in real samples.

Main Methods:

• Synthesis of various mu-oxo-bismetalloporphyrin complexes.
• Fabrication of potentiometric electrodes with optimized membrane compositions.
• Electrochemical characterization including potentiometric response, pH range, and response time.
• Selectivity testing against common interfering ions.
• UV/VIS spectrophotometry to study ion-ligand interactions.
• Application testing in electroplating solutions.

Main Results:

• An optimized electrode based on mu-oxo-bis[tetra(p-chlorophenyl)porphinatomanganese(III)] demonstrated a wide linear range (4.3 x 10(-7) to 1.0 x 10(-1) mol L(-1)) for BF4- detection.
• The sensor exhibited a fast response time (30 s) and a broad working pH range (5.5–12.0).
• The electrode showed excellent anti-Hofmeister selectivity for BF4- over common co-existing ions.
• Successful application of the sensor for determining fluoroborate in electroplating solutions was achieved.

Conclusions:

• Mu-oxo-bismetalloporphyrin complexes are effective electroactive materials for developing high-performance fluoroborate sensors.
• The developed potentiometric sensor offers significant improvements in selectivity and performance compared to existing methods.
• The sensor is suitable for practical determination of fluoroborate in industrial samples.