Complete Transmetalation in a Metal–Organic Framework by Metal Ion Metathesis in a Single Crystal for Selective Sensing of Phosphate Ions in Aqueous Media

Abstract

Ac omplete transmetalation has been achieved on ab arium metal-organic framework (MOF), leading to the isolation of an ew Tb-MOF in as ingle-crystal (SC) to singlecrystal (SC) fashion. It leads to the transformation of an anionic framework with cations in the pore to one that is neutral. The mechanistic studies proposed ac ore-shell metal exchange through dissociation of metal-ligand bonds.This Tb-MOF exhibits enhanced photoluminescence and acts as as elective sensor for phosphate anion in aqueous medium. Thus,t his work not only provides am ethod to functionalize aMOF that can have potential application in sensing but also elucidates the formation mechanism of the resulting MOF.

Fluorescent molecule incorporated metal-organic framework for fluoride sensing in aqueous solution

“…11b) respectively, which may be attributed to the combination of zirconium ion and fluoride [41][42].Therefore, we suggest that fluoride in aqueous solution can lead to the collapse of the FS@UiO-66 framework and then the release of the fluorescent molecule, as shown in Scheme 1. This detection mechanism is similar to that in some previous works [17,[43][44][45]. These results further indicate that FS@UiO-66 is a highly selective sensor for fluoride.…”

Cost-effective17O enrichment and NMR spectroscopy of mixed-metal terephthalate metal–organic frameworks

“…Mixed-metal MOFs containing more than one type of node are of great current interest. 17 – 20 Mixed metals can be introduced either during synthesis or through post-synthetic transmetallation, 21 , 22 and can significantly affect the properties of the materials produced. In MIL-53 the presence of mixed-metal centres has been shown to cause changes 17 – 19 both in the structures adopted and in the reversibility of the breathing behaviour, suggesting further investigation is required to fully understand how the porous properties of MOFs can be controlled and tuned for target applications.…”

Versatile bimetallic lanthanide metal-organic frameworks for tunable emission and efficient fluorescence sensing

“…Therefore, sensing metal ions/VOCs can be realized by tuning the energy transfer efficiency from "antennae" to Ln 3+ ions through host-guest interactions. A few luminescent Ln-MOFs with optical properties that are responsive to the guest molecules have been developed [42][43][44] . However, their luminescent signals only respond to specific molecules.…”