Nano-octahedral bimetallic Fe/Eu-MOF preparation and dual model sensing of serum alkaline phosphatase (ALP) based on its peroxidase-like property and fluorescence

NH3 Plasma Functionalization of UiO-66-NH2 for Highly Enhanced Selective Fluorescence Detection of U(VI) in Water

“…Generally, fluorescence emission of UiO-66-NH 2 was caused by excitation and electron transition between its energy levels. After the recognition of U­(VI) by selective adsorption, part of the excited electrons can be transferred from the HOMO energy level of the probe to the LUMO energy level of UO 2 2+ (Figure S6b) and thus diminish the number of transition electrons within the probe, resulting in the static fluorescence quenching …”

“…After the recognition of U(VI) by selective adsorption, part of the excited electrons can be transferred from the HOMO energy level of the probe to the LUMO energy level of UO 2 2+ (Figure S6b) 73 and thus diminish the number of transition electrons within the probe, resulting in the static fluorescence quenching. 74 To further demonstrate the detection mechanism, LTP@ UiO-66-NH 2 samples modified with more functional groups were obtained by long-time plasma treatment (Table S4). Fluorescence responses of the samples toward U(VI) are shown in Figure S7.…”

A butterfly shaped Eu4(OH)2 cluster-based luminescent metal–organic framework with Lewis basic triazole sites demonstrating turn off sensing in the presence of organic amines

“…The high resolution XPS spectra of N 1s show binding energies of 399.48 eV and 401.38 eV, which are attributed to the nitrogen-nitrogen bonds (N-N) and carbon-nitrogen bonds (C-N), respectively. 74,75 In EDA@1, a new peak at 402.58 eV that is not observed in compound 1 is related to the nitrogen-hydrogen bond (N-H) of EDA, and the peak generated by C-N and N-N bonds moved about 0.1 eV to the direction of higher binding energy (Fig. 5c), indicating that the N-H⋯N hydrogen bond may be formed between EDA and compound 1.…”

“…5b, and the binding energies of 531.38 eV, 531.58 eV and 533.28 eV correspond to the metal coordinated oxygen (Eu-O), hydroxyl oxygen (OH) and carbonyl oxygen (CvO), respectively. 74,75 Compared with compound 1, the binding energies of the hydroxyl oxygen (OH) in EDA@1 move about 0.2 eV to the direction of higher binding energy (Fig. 5b), indicating that the O-H⋯N hydrogen bond may be formed between EDA and compound 1.…”

Hybridization-driven fluorometric platform based on metal-organic frameworks for the identification of the highly homologous viruses

“…In this study, we only paid close attention to the construction of MOFs-based fluorescence sensing [ [32] , [33] ]. The usual strategy mainly focuses on the use of MOFs as either signal probes or signal probe carriers, including the highly sensitive controllable release of fluorescence molecules or fluorescence-quenching-recovery detection [ [34] , [35] ]. In these sensing areas, signal probes or signal probe carriers have to keep in constant contact with specimens.…”