Molecular variation and fluorescent turn-on detection of chromium(III) by three ESIPT-reactive 2,2'-(1,4-phenylenebis(5-phenyl-1H-imidazole-4,2-diyl))diphenols

Luminescence of ESIPT-capable zinc(ii) complexes with a 1-hydroxy-1H-imidazole-based ligand: exploring the impact of substitution in the proton-donating moiety

“…The emission of ESIPT-capable dyes is highly sensitive to solvents, 43–50 substitution in the ESIPT-dye core, 51–71 protonation/deprotonation, 72–80 and coordination of metal ions. 81–96 Normally, the latter process is coupled with the deprotonation of ESIPT-dyes. 81–96 However, the rational design of ESIPT-capable molecules featuring spatially separated sites for accommodating both a metal ion and the mobile H + ion, i.e.…”

“…81–96 Normally, the latter process is coupled with the deprotonation of ESIPT-dyes. 81–96 However, the rational design of ESIPT-capable molecules featuring spatially separated sites for accommodating both a metal ion and the mobile H + ion, i.e. , the metal binding site and the ESIPT site, paves the way toward the coordination of metal ions without the deprotonation of the ESIPT-dyes.…”

“…42 The emission of ESIPT-capable dyes is highly sensitive to solvents, [43][44][45][46][47][48][49][50] substitution in the ESIPT-dye core, protonation/deprotonation, [72][73][74][75][76][77][78][79][80] and coordination of metal ions. [81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96] Normally, the latter process is coupled with the deprotonation of ESIPT-dyes. [81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96] However, the rational design of ESIPTcapable molecules featuring spati...…”

“…[81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96] Normally, the latter process is coupled with the deprotonation of ESIPT-dyes. [81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96] However, the rational design of ESIPTcapable molecules featuring spatially separated sites for accommodating both a metal ion and the mobile H + ion, i.e., the metal binding site and the ESIPT site, paves the way toward the coordination of metal ions without the deprotonation of the ESIPT-dyes. This strategy allows one to synthesize ESIPT-capable coordination polymers and molecular ESIPT-capable metal complexes, [118][119][120][121][122][123][124] which are extraordinarily rare classes of ESIPT-capable materials at the moment.…”

N-Hydroxy–N-oxide photoinduced tautomerization and excitation wavelength dependent luminescence of ESIPT-capable zinc(ii) complexes with a rationally designed 1-hydroxy-2,4-di(pyridin-2-yl)-1H-imidazole ESIPT-ligand

“…This causes alterations in the fluorescence response of the fluorophore molecule, allowing the use of ESIPT-fluorophores as fluorescent probes for the detection of metals. [57][58][59][60][61][62][63][64][65] In this (most common) case, both H + and metal ions compete for one and the same site in the structure of an organic fluorophore.…”