Synthesis and characterization of a highly selective turn-on fluorescent chemosensor for Sn2+ derived from diimine Schiff base

Synthesis, characterization, and investigation of some properties of the new symmetrical bisimine Ni(II), Zn(II), and Fe(III) complexes derived from the monoimine ligand

“…When the concentration of each metal used is possibly interact with the nitrogen atoms of the imine groups in the HL. [46] It appears that fluorescence emission gradually quenched due to increased Pb 2+ concentration compared with measured fluorescence emissions depending on different Pb 2+ concentrations (Figure 6). Although HL has no fluorescence feature, it is seen in the fluorescence spectrum in Figure 7 that PL, the polymer synthesized from HL, emits 551 nm when excited with 460-nm light.…”

Triphenylamine-based small-molecule fluorescent probes

“…Kolcu et al designed and synthesized a triphenylamine-based probe 46 which can recognize Sn 2+ by a potent chelation enhanced fluorescence (CHEF) effect. 83 Probe 46 showed no fluorescence because of PET and CN isomerisation, but in the presence of Sn 2+ , the CHEF effect leads to restriction of the electron transfer process, resulting in fluorescence emission at 460 nm. The authors proved that Sn 2+ ions were bound to 46 in 2 : 1 (metal : ligand) stoichiometry and also calculated that the fluorescence quantum yield of 46 in the presence of Sn 2+ was 24% (Fig.…”

Fluorescent Schiff base sensors as a versatile tool for metal ion detection: strategies, mechanistic insights, and applications

“…19 and Table 2). 98 In DMSO-H 2 O (1 : 1, v/v) solution, sensor 31 was non-fluorescent due to CQN isomerization and the PET process. However, in the presence of Sn 2+ , the fluorescence spectrum of sensor 31 displayed a strong emission band at 460 nm (l ex = 320 nm) along with a color change of the solution from yellow to deep blue under a UV lamp.…”