Strontium-selective membrane electrodes based on some recently synthesized benzo-substituted macrocyclic diamides

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Materials Science

Background:

• Macrocyclic compounds are crucial for ion recognition.
• PVC membrane electrodes are widely used for ion sensing.
• Strontium ion detection is important in various environmental and biological applications.

Purpose of the Study:

• To synthesize and characterize novel macrocyclic diamides as ion carriers.
• To develop a selective and sensitive PVC membrane electrode for strontium ion detection.
• To evaluate the performance and stability of the developed strontium sensor.

Main Methods:

• Synthesis of eight macrocyclic diamides.
• Fabrication and electrochemical characterization of PVC membrane electrodes.
• Potentiometric measurements to determine Nernstian response, limit of detection, and selectivity.
• Long-term stability tests and application in potentiometric titration.

Main Results:

• One macrocyclic diamide, 1,13-diaza-2,3;11,12-dibenzo-4,7,10-trioxacyclopentadecane-14,15-dione, showed excellent performance.
• The electrode exhibited a wide linear concentration range (1.0 × 10(-)(1) to 3.2 × 10(-)(5) M) with a low limit of detection (8.0 × 10(-)(6) M).
• The sensor demonstrated a fast response time (∼10 s), good selectivity over various ions, and stability for over three months.

Conclusions:

• The synthesized macrocyclic diamide is a highly effective carrier for strontium ions in PVC membrane electrodes.
• The developed electrode offers a reliable and sensitive method for strontium ion determination.
• The sensor's performance makes it suitable for applications such as potentiometric titration of carbonate ions.