Bifunctionalized Metal–Organic Frameworks for Pore‐Size‐Dependent Enantioselective Sensing

Abstract

Porosity is a fundamental property of metalorganic frameworks (MOFs). However, the role of the pore size has always been underestimated in MOF-based luminescent sensors for enantioselective sensing. The construction of isoreticular MOFs (IRMOFs) with variable pore sizes and the synergy between chirality and luminescence is challenging. Herein, a general strategy was developed to introduce chirality into two well-known IRMOF-74 analogs with nanochannels of identical shapes but different pore sizes by functionalizing the open metal site under mild conditions. To enhance the detection accuracy, a second luminescent center was introduced into the IRMOF-74 system to achieve ratiometric sensing. The two bifunctionalized IRMOF-74 compounds exhibited pore-size-dependent sensing performance for enantiomers. This study not only provides a convenient method to construct chiral MOFs as advanced sensing materials but also reveals the fundamental of the pores in MOF-based luminescent sensors.

Two Stable Cd-MOFs as Dual-Functional Materials with Luminescent Sensing of Antibiotics and Proton Conduction

“… , To elucidate whether the luminescent emission may be influenced by the interactions or collision between CAP and frameworks, the luminescent lifetimes of 1 and 2 before and after sensing CAP in aqueous solutions were tested. Figure S11 and Table S6 reveal that the luminescent lifetimes of 1 and 2 almost do not change upon the addition of CAP, indicating that static quenching is dominant. , To further analyze the interactions between MOFs and CAP, the XPS spectra were performed (Figures S12 and S13). A comparison of 1 and 2 shows that the binding energy of N 1s changed from 404.74 to 404.58 eV for 1 and 404.76 to 404.57 eV for 2 after the detection of CAP.…”

“…Figure S11 and Table S6 reveal that the luminescent lifetimes of 1 and 2 almost do not change upon the addition of CAP, indicating that static quenching is dominant. 9, 70 To further analyze the interactions between MOFs and CAP, the XPS spectra were performed (Figures S12 and S13). A comparison of 1 and 2 shows that the binding energy of N 1s changed from 404.74 to 404.58 eV for 1 and 404.76 to 404.57 eV for 2 after the detection of CAP.…”

The postsynthetic renaissance of luminescent lanthanide ions on crystalline porous organic framework materials

“…Then, Tb 3+ ions were grafted onto the carboxyl groups of l -lactic acid to obtain IRMOF-74-I/II-Mg–C–Tb, which were used as enantioselective sensors. 85…”

Metal–Organic Frameworks and Their Composites for Environmental Applications

“…[13,14] In light of the situations mentioned above, it is extremely urgent to develop efficient and durable materials for practical applications in environmental purification. In the past decade, a new class of crystalline porous metal-organic frameworks (MOFs), have been studied in widespread applications such as adsorbent, [15][16][17][18][19][20] photoreduction catalyst, [21,[22][23][24] rapid removal kinetics, [25] catalyst, [26][27][28] scavenger, [29] and separation substance and environmental purifications, [17,[30][31][32][33][34][35] because of their adjustable inner surface, tailorable morphology, [36] hydrolysis stability, [37] adjustable hole/ cage size, large specific surface area, [38] and flexible skeleton. [39] Compared with traditional inorganic porous materials (activated carbon, zeolite, etc.…”