Advances in luminescent metal-organic framework sensors based on post-synthetic modification

Ultrastable Tb-Organic Framework as a Selective Sensor of Phenylglyoxylic Acid in Urine

“…When the spacer group exists, the PET process is blocked, and the fluorophore would light up. On the contrary, when the fluorophore is in direct contact with the receptor, the electron transfer between the excited fluorophore and the acceptor might quench the luminescence. , The electron transfer needs to satisfy that the lowest-unoccupied molecular orbital (LUMO) of the donor (fluorophore) is higher than that of the acceptor (quencher). − The driving force of this process comes from the LUMO energy gap between donor and acceptor . This unique luminescence property has been widely applied.…”

Interpenetrated metal–organic frameworks with enhanced photoluminescence for selective recognition of m-xylene from xylene isomers

“…[20][21][22][23] Among the reported luminescent materials, luminescent metal-organic frameworks (LMOFs) have recently emerged as potential chemical sensors because of their superiorities of inherent crystallinity, designable structure, tunable pores, and multiple functionalizations. [24][25][26][27][28] At present, the use of LMOFs as sensors has been extensively investigated in a wide range of applications including ion detection, pH sensing, and organic molecular recognition. [29][30][31][32][33][34] Certainly, the luminescence properties of LMOFs can arise from organic ligands or metal ions owing to the inherent hybrid nature.…”

Chromic and Fluorescence-Responsive Metal–Organic Frameworks Afforded by N-Amination Modification

“…The excessive emissions of harmful gases and volatile organic compounds (VOCs) from rapidly growing industries and human consumption have exerted a negative impact on air quality and put the ecological environment and human health at risk. , For instance, formaldehyde is a notorious indoor pollutant that can be emitted from buildings and decorative materials and many indoor products. , Chronic inhalation of formaldehyde can cause serious health problems including cancers . Therefore, sensing materials that can output detectable signals on exposure to harmful gases or VOCs are vigorously sought for their technological relevance as well as scientific implications. − Among others, chromic and fluorescence-sensing materials have attracted much attention because the response in optical absorption (color) or emission can be easily detected. − Metal–organic frameworks (MOFs) have emerged as a huge class of porous hybrid materials with highly diverse structures and highly versatile functions. − The modulable porous frameworks can be constructed or modified to contain luminescent or luminogenic ingredients and have recognition sites that are accessible by exogeneous molecules through open pores or channels. − The de-excitation of the photoexcited states is sensitive to the host–guest interactions, so it is not surprising that a plethora of luminescent MOFs have been reported to be capable of sensing various chemical species, including some VOCs. − …”