Synthesis and Characterization of Antioxidant Biphenyl Appended 1,2,3‐Triazoles as Potential Chemo‐Sensor for Sn2+ Ions: Excellent Selectivity and Low Detection Limit

Abstract

AbstractDesigning of chemo‐sensors is a new scope of intrigue among researchers. After inspecting the beneficial and harmful effects of Sn(II) metal ions in living species, 1,2,3‐ Triazole based chemo‐sensor 4 a have been synthesized via click route. In the current article, literarily new 1,2,3‐Triazoles (4 a–4 d) have been synthesized and identified via various spectroscopic means such as NMR(1H & 13C), IR and mass spectrometry. Triazole 4 a was explored for recognition properties via absorption and emission spectroscopy and found specific and selective for Sn(II) metal ions. The recognition of Sn2+ metal ions by probe 4a was not interfered because of other tested metal cations. The probe has very low detection limit of 0.47×10−7 M and 3.8×10−9 M via ultraviolet and fluorescence spectroscopy respectively which is lower than many previously reported sensors. The B−H plot and stern volmer's plot confirmed a high binding affinity between probe 4a and tin (II) metal ion. The association constant (Ka) and stern volmer constant (Ksv) were calculated as 13.36×105 M−1 and 12.6×106 M−1 from B−H plot and stern volmer's plot respectively. The Stoichiometric ratio between chemo‐sensor 4 a and Sn2+ metal ions was confirmed as 1 : 1 by the job's plot. Moreover, in this study, the synthesized compounds 4(a–d) were examined for their antioxidant properties. The total antioxidant activity (TAA) results indicate that the synthesized triazoles 4(a–d) found to be excellent postulant for radical scavenging. TAA values for 4 a, 4 b, 4 c and 4 d are found to be 4.65±0.2, 6.79±0.3, 6.29±0.2, 5.06±0.1 (mM)(eq. ascorbic acid) per 100 mM of particle respectively.