A luminescent Cd(ii) coordination polymer as a multi-responsive fluorescent sensor for Zn²⁺, Fe³⁺ and Cr₂O₇²⁻ in water with fluorescence enhancement or quenching

Abstract

A luminescent Cd(ii) coordination polymer can act as a multi-responsive sensor for efficiently detecting Zn2+, Fe3+ and Cr2O72− ions.

A family of Cd(ii) coordination polymers constructed from 6-aminopicolinate and bipyridyl co-linkers: study of their growth in paper and photoluminescence sensing of Fe3+ and Zn2+ ions

“…As far as we are aware, the vast majority of Zn 2+ sensors reported so far are based on organic molecules, [46][47][48] whereas only a few examples of CPs, with similar detection parameters, can be found in the literature for the detection of this ion (see Table S29 †). 49,50 Given the promising sensing capacity shown by 2 towards the Zn 2+ ion, and in an effort to exclude the possible interference by other metal cations usually present in significant concentrations in natural water for a practical application, the PL behavior of the compound was analyzed in the presence of Na + , K + , Ca 2+ and Mg 2+ . As observed in the inset of Fig.…”

“…On the other hand, the positive emissive response towards Zn 2+ is not surprising because the few reported CP-based sensors also display a similar turning-on behavior with this ion, which is presumably derived from a direct analyte-CP interaction. 49,50 In order to get deeper insights into this possibility, the PL data were acquired for aqueous dispersions of 2 in the absence/ presence of the analytes. As expected from the previous titration results, no significant changes were observed for the excitation and emission bands, meaning that the interaction with these ions does not substantially affect the HOMO-LUMO energy gap of the compound (Fig.…”

“…44 Additionally, there has been a growing concern over the detection of other less toxic ions in drinking water because the imbalance of some metal ions such as Zn 2+ , traditionally considered an antioxidant in living systems, has been shown to cause oxidative stress or become toxic in cellular environments. 45 As far as we are aware, the vast majority of Zn 2+ sensors reported so far are based on organic molecules, [46][47][48] whereas only a few examples of CPs can be found in the literature for the detection of this ion, 49,50 thus making the study of novel PL sensors of Zn 2+ a priority in this field. Despite the proven high sensitivity and low limits of detection (LOD) shown by luminescent CPs, their application in real analysis is still challenging given their poor mechanical properties that make these materials difficult to handle.…”

Polytorsional-amide/carboxylates-directed Cd(ii) coordination polymers exhibiting multi-functional sensing behaviors

“…29,30 Among many uorescent sensing materials, coordination polymers (CPs) selfassembled by d 10 metal centers and organic ligands are considered as a kind of excellent sensor used for qualitative and quantitative detection of heavy metal ions, organic pesticides, antibiotic. [31][32][33][34][35][36][37] However, some of these sensors have relatively single detection objects. [38][39][40] Thus, it is of great signicance to develop complex-based sensing materials with multifunctional detection response, which is also a challenge facing this eld at present.…”