A highly selective and sensitive fluorescent chemosensor for distinguishing cadmium(ii) from zinc(ii) based on amide tautomerization

Abstract

A naphthalimide-derived fluorescent sensor termed L2 was designed and synthesized.

Bicolour fluorescent molecular sensors for cations: design and experimental validation

“…This conformational change results in an increase of the dipole and quadrupole moments of the molecule by a loss of the centre of inversion present in the most stable conformation of the unbound probe. Please do not adjust margins Please do not adjust margins emission observed in some ICT-based sensors has been attributed to differences in electronic affinities, 80 binding modes, 81 or ion sizes. 81 Representative examples are shown in Figure 11.…”

“…Please do not adjust margins Please do not adjust margins emission observed in some ICT-based sensors has been attributed to differences in electronic affinities, 80 binding modes, 81 or ion sizes. 81 Representative examples are shown in Figure 11. It is worth pointing out that sensor L2 showed an extremely low detection limit for Cd 2+ (0.24 nM), and that both L1 and L2 were tested on solid supports, as the active component of indicator paper.…”

“…The electronic origin of the shift in the emission observed in ICT-based sensors makes it feasible to develop multi-target sensors, able to discriminate between similar cations due to the different emission colours of their corresponding complexes. The cation-dependent polychromic emission observed in some ICT-based sensors has been attributed to differences in electronic affinities, 80 binding modes, 81 or ion sizes. 81 Representative examples are shown in Fig.…”

“…The cation-dependent polychromic emission observed in some ICT-based sensors has been attributed to differences in electronic affinities, 80 binding modes, 81 or ion sizes. 81 Representative examples are shown in Fig. 11 .…”

N,N,N′,N′‐Tetrakis(3‐isoquinolylmethyl)‐2,6‐lutidylenediamine (3‐isoTQLN): A Fluorescent Zn2+/Cd2+ Dual Sensor as a Hybrid of 2‐Quinolyl/1‐Isoquionolyl Counterparts TQLN/1‐isoTQLN

“…[10][11][12][13] There are limited examples of fluorescent probes that enable differential detection of Zn 2 + and Cd 2 + in a single molecule. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Strategies to discriminate Zn 2 + from Cd 2 + via fluorescence signals utilize (1) different ligand donor atoms, [14][15][16][17] (2) mononuclear/dinuclear complex formation, [18] (3) test strip, [19] (4) difference in metal binding affinity highlighted by appropriate auxiliary reagent, [20][21] and (5) different emission mechanism based on small structural difference in metal complexes. [22][23][24][25][26][27][28] We have been focusing on the difference in coordination numbers of Zn 2 + and Cd 2 + .…”