Pyrrole bearing diazocrowns: Selective chromoionophores for lead(II) optical sensing

• Published in: Sensors and actuators. B, Chemical Chemical, 2022-06, Vol.361, p.131678, Article 131678
• Main Authors: Galiński, Błażej, Wagner-Wysiecka, Ewa
• Format: Article
• Language: English
• Subjects: Cellulose triacetate; Chromoionophore; Colorimetry; Lead(II); Macrocycle; Molecular chains; Optode; Shades; Spectrophotometry
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2022.131678

Diazocrowns of 18-, 21- and 23-membered rings with pyrrole residue as a part of macrocycle were for the first time used as chromoionophores in lead(II) selective optodes. Sensing properties of optodes depend on the type of macrocycle, namely its size and the type of linker: oligoether or hydrocarbon chain. The best results were obtained for optode bearing 18-membered crown with oligoether linker showing linear response range of 8.05 × 10−8–2.24 × 10−5 M lead(II) and detection limit of 1.15 × 10−8 M. Membrane, based on cellulose triacetate, is lead(II) selective giving color change from red to different shades of blue (pH 5.5). Results obtained for model and real samples of lead(II) showed that easily accessible and regenerable sensor material can be used for spectrophotometric and colorimetric (Digital Color Analysis) detection and determination of lead(II). [Display omitted] •Pyrrole bearing diazomacrocycles can act chromoionophores in lead(II) selective optodes.•Macrocycle type determines the properties of optode.•Sensor with 18-membered crown with oligoether chain has the best properties.•Spectrophotometric and colorimetric detection/determination of lead(II) is possible.•Optode is stable, cost effective, easy to prepare and regenerable.