Ionophore Properties of Schiff Base Compounds as Ion Sensing Molecules for Fabricating Cu(II) Ion-Selective Electrodes

• Published in: Journal of analytical chemistry (New York, N.Y.) N.Y.), 2018, Vol.73 (1), p.82-90
• Main Authors: Hasani, Bahram, Zamani, Abbasali, Moftakhar, Mahdieh Koorepazan, Mostafavi, Maryam, Yaftian, Mohammad Reza, Ghorbanloo, Massomeh
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Chemical properties; Chemistry; Chemistry and Materials Science; Copper; Copper ions; Dibutyl phthalate; Electrodes; Hydroxybenzaldehydes; Imines; Ionophores; Ions; Polyvinyl chloride; Production processes; Response time; Schiff bases; Sensors; Titration
• ISSN: 1061-9348; 1608-3199
• DOI: 10.1134/S1061934818010021

Bis(2-hydroxybenzaldehyde)-1,2-diaminoethane ( L I ), bis(2-hydroxybenzaldehyde)-1,3-diaminopropane ( L II ) and bis(2-hydroxybenzaldehyde)-4,4'-methylendianiline ( L III ) were examined as ionophores for fabrication of polyvinylchloride ( PVC ) membrane Cu(II) ion-selective potentiometric sensors. The optimum composition (%) for the sensors was: 5 L I , 30 PVC, 6 sodium tetraphenylborate ( NaTPB ), 59 ortho -nitrophenyloctyl ether ( NPOE ); 4 L II , 30 PVC, 5 NaTPB, 61 dibutyl phthalate; 6 L III , 30 PVC, 5 NaTPB, 59 NPOE. The linear response range of the electrodes was 5 × 10 –4 –0.05 (L I ), 5 × 10 –4 –0.1 (L II ) and 1 × 10 –6 –0.01 M (L III ), and the corresponding detection limits were 4 × 10 –4 , 4 × 10 –4 and 2 × 10 –7 M, respectively. The sensors were showed rapid response time (≈10 s). Their responses were independent on pH in the range 2.5–5.0 (L I ), 3.2–4.7 (L II ) and 4.0–5.0 (L III ). The selectivity of the prepared electrodes towards copper ions over some mono-, di- and trivalent metal ions was evaluated. The sensors were used as indicator electrode in potentiometric titration of copper ions in aqueous solutions.