Cobalt(II) selective membrane electrode based on palladium(II) dichloro acetylthiophene fenchone azine

► Palladium(II) dichloro acetylthiophene fenchone azine as ionophore for cobalt(II) ion-selective electrode. ► Electrode exhibits a Nerstian response. ► Best performance in terms of good selectivity, broad working range, wide pH range and reasonable shelf life. ► The electrode is also used in determining cobalt(II) in water samples.