Detection of nitrophenols with a fluorescent Zr(iv) metal–organic framework functionalized with benzylamino groups

Abstract

Nitroaromatic compounds (NACs) are known explosives and environmental pollutants posing a risk for public health and national security. Thus, the development of efficient sensors for their rapid and efficient in–field...

Molecular insights into the sensitivity detection mechanism of fluorescent 2D Zr-BTB for 2,4-dinitrophenol

“…S15, ESI †), 37 which was superior to that reported in the literature. 23,26,[41][42][43][44][45][46][47][48] Table 1 shows the response time (s), LOD, and K sv values of some representative examples of luminescent MOF sensors to 2,4-DNP.…”

“…Various sensing mechanisms have been proposed at the molecular level, including structural collapse, guest-induced electron/energy transfer, absorbed energy competition, and Lewis acid/base interactions between analytes and materials. [24][25][26] Regardless of the sensing mechanisms, the crucial factor for sensing is the appropriate distance between the analyte and the fluorophore. Consequently, it is necessary to use advanced experimental techniques combined with computational results to probe specific interaction sites and reveal the sensing mechanism at the molecular level.…”

The role of terminal coordinated amides in a series of Ca-tatb frameworks: pore size regulation and fluorescence sensing tunability

“…It is well acknowledged that due to the presence of low-lying unoccupied p* molecular orbitals, the nitroaromatic molecules generally act as an efficient acceptor for electrons from fluorophores in their excited state which results in a quenching response in emission. 42,43 As shown in Fig. 5c, the energy levels of the lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) in compound 2 and TNP are calculated, and the energy level of the LUMO of the TNP molecule is lower than that of the LUMO but higher than that of the HOMO of 2 (Fig.…”

Selective Methane Oxidation to Acetic Acid Using Molecular Oxygen over a Mono-Copper Hydroxyl Catalyst

“…We have recently reported the development of highly electron-deficient cobalt hydroxyl and hydroperoxide species supported by metal-oxo nodes of a cerium metal–organic framework (MOF), which enables activation of the methane C–H bond under mild conditions via σ-bond metathesis . MOFs have drawn immense interest in recent years as porous solid supports to encapsulate or anchor active metal catalysts for chemoselective C–H bond activation owing to their crystalline nature, reticular synthesis, and tunable pores. − The ease of preparing single-site metal catalysts at MOF’s nodes or linkers via active-site isolation not only prevents intermolecular decomposition pathways but also simplifies the investigation of the catalytic mechanism. ,,,− Furthermore, the micropores of MOFs increase the local concentration of methane and other gas molecules around the active sites. , Here, we report an efficient direct methane to acetic acid transformation using water and O 2 over a MOF-supported mono-copper­(II) hydroxyl catalyst. The isolation of the active Cu-OH species at the nodes of the Ce-UiO-66 MOF confined within the micropores enables it to afford acetic acid with a high productivity of 335 mmolg cat –1 and 100% selectivity in the liquid phase.…”