A turn-on luminescent probe for Fe³⁺and ascorbic acid with logic gate operation based on a zinc(ii)-based metal–organic framework

Abstract

A zinc(ii)-based metal–organic framework exhibits fluorescence turn-on behaviour for Fe3+ and AA with high sensitivity and selectivity.

A de novo strategy for the development of a ZnII–organic framework based luminescent “switch-on” assay for size-exclusive sensitization of the oxidised form of glutathione (GSSG) over the reduced form (GSH): insights into the sensing mechanism through DFT

“…S5a†). Presumably, the emission of Zn-CMERI may be attributed to the intra-ligand π* → π charge transfer transition, which mostly stems from the N-donor ligand, 22 as herein the involvement of the metal centre in charge transfer is almost negligible due to the presence of the Zn( ii ) metal centre with d 10 electronic configuration. 23…”

“…S5a †). Presumably, the emission of Zn-CMERI may be attributed to the intra-ligand π* → π charge transfer transition, which mostly stems from the N-donor ligand, 22 as herein the involvement of the metal centre in charge transfer is almost negligible due to the presence of the Zn(II) metal centre with d 10 electronic configuration. 23 The sensitivity of Zn II -MOF towards diverse biologically relevant ions and biomolecules (GSH, Cys, Hcy, GSSG, glucose, uracil, cytosine, isoleucine, valine, etc.)…”

Changes in Optical Properties upon Dye–Clay Interaction: Experimental Evaluation and Applications

“…As shown in Figure S7 , the fluorescent signal of Chi_FITC increased with the increase in pH, but in the presence of 10C MMT and 0.1C MMT, the pH responsiveness of the dye was completely lost, even at low concentrations, which can be ascribed to the stabilization of the electron distribution of FITC upon interaction with MMT ( Figure S7 ). Such behavior of FITC interacting with MMT will be useful in designing optical hybrid materials for applications where the changes in fluorescence intensity upon pH variation are undesirable, such as in imaging and sensing [ 58 , 59 ].…”

Four Novel Lanthanide(III) Metal–Organic Frameworks: Tunable Light Emission and Multiresponsive Luminescence Sensors for Vitamin B6 and Pesticides

“…Spectrofluorimetry is a simple and effective method to detect biological molecules. In the past several years, luminescent MOFs as sensors have been applied to detect biological molecules, such as vitamins and amino acids. − Currently, luminescent MOFs are mainly used to detect vitamin C. , To our knowledge, few MOFs have been investigated to detect VB 6 as a luminescence sensor. Eu­(III)-MOFs and Tb­(III)-MOFs with narrow and typical fluorescent emissions can be used as chemical sensors to sense VB 6 .…”