Two Schiff base ligands for distinguishing Zn^II/Cd^II sensing—effect of substituent on fluorescent sensing

Abstract

Two Schiff base ligands (HL1, HL2) were synthesized as fluorescent sensors for Zn2+ or Cd2+. With an ethoxyl group, HL1 can distinguishingly sense Zn2+ and Cd2+, while HL2 exclusively responds to Zn2+.

A pyridine based Schiff base as a selective and sensitive fluorescent probe for cadmium ions with “turn-on” fluorescence responses

“…28 The sensor synthesized by Cai and co-workers can distinguish Zn II and Cd II sensing with different fluorescence emission wavelengths and the detection limit is down to micromole range concentration in ethanol solution. 29 A probe consisting of 2-hydroxy-3-(hydroxymethyl)-5-methylbenzaldehyde and quinoline moieties has been reported for recognition of Cd 2+ with a prominent fluorescence enhancement along with a large red shift (B38 nm). 30 However, these probes have some limitations.…”

Isolation and Characterization of Different Homometallic and Heterobimetallic Complexes of Nickel and Zinc Ions by Controlling Molar Ratios and Solvents

“…Notably, several Schiff‐base complexes of Zn II have been reported and their properties including photophysical and antimicrobial properties have been explored , . Therefore, Schiff‐base complexes of zinc have not only found potential applications as fluorescent probes, and antimicrobial agents, but also as precursors for zinc oxide based inorganic materials . Interestingly, multinuclear Zn II –Schiff base complexes containing Zn–O–Zn bridging have been used as precursors for the synthesis of ZnO nanoparticles .…”

Transition metal complexes of a dihydroquinazoline-containing ligand: synthesis, crystal structures and physical properties

“…Transition metal complexes of bidentate, tridentate and multidentate Schiff base ligands have been found to possess catalytic [1][2][3], magnetic [4,5], luminescent [6,7] and electrochemical properties [8,9]. Since the properties of such complexes are heavily influenced by the nature of the ligands [10], much attention has been given to the design and synthesis of chelating ligands.…”