Luminescent metal–organic frameworks as chemical sensors based on “mechanism–response”: a review

Abstract

Metal–organic frameworks (MOFs), composed of metal ions/clusters and organic ligands and possessing inherent crystallinity, a definite structure, a tunable pore, and multiple functionalizations, have shown potential for numerous applications. Recently,...

The coordination chemistry of benzhydrazide with lanthanide(iii) ions: hydrothermalin situligand formation, structures, magnetic and photoluminescence sensing properties

“…The possible reason of quenching by acetone molecules might be attributed to the competitive energy absorption. 20 This was evidenced by the observation of an overlap of the absorption band of acetone with the excitation spectra of 9, 11, 14, and 16 in the UV-Visible spectra (Fig. S11 † ).…”

Two bis-ligand-coordinated Zn(ii)-MOFs for luminescent sensing of ions, antibiotics and pesticides in aqueous solutions

“…Generally, the effects on fluorescence can be ascribed to two major reasons: material transformation and energy transfer. 76 From a structural point of view, skeletal eruption, weak or strong host and guest interactions and charge transfer are the main causes of fluorescence quenching. 59 Taking this into account, FT-IR (Fig.…”

“…Then, the search for the induction of fluorescence quenching moves to energy transfer. The energy-transfer mechanism includes the inner filter effect (IFE), 57 fluorescence resonance energy transfer (FRET) 76 and photoinduced electron transfer (PET) theory. 77 FRET occurs through the transfer of energy from an excited donor to a ground state acceptor via a dipole–dipole interaction, which requires the wavelength of the emitted light to be located in the absorption band of the analytes.…”

“… 77 FRET occurs through the transfer of energy from an excited donor to a ground state acceptor via a dipole–dipole interaction, which requires the wavelength of the emitted light to be located in the absorption band of the analytes. 76 Therefore, the UV-vis absorption profiles of the analytes at a unique concentration in comparison with the excitation and emission of the sensors were evaluated and are exhibited in Fig. 10 .…”

Cinnamal Sensing and Luminescence Color Tuning in a Series of Rare-Earth Metal−Organic Frameworks with Trans-1,4-cyclohexanedicarboxylate

“…The sufficient porosity of the coordination frameworks [Ln 2 (phen) 2 (NO 3 ) 2 (chdc) 2 ], coupled with their remarkable luminescence properties, suggest a further investigation of a guest-dependent luminescence for sensing applications. For example, the nitroaromatic organic molecules, being electron-deficient species, often quench the luminescence of the porous MOFs due to efficient charge transfer [ 60 , 61 , 62 , 63 , 64 , 65 , 66 ]. Preliminary experiments with single-metal compounds [Eu 2 (phen) 2 (NO 3 ) 2 (chdc) 2 ]∙2DMF ( 2 ) and [Tb 2 (phen) 2 (NO 3 ) 2 (chdc) 2 ]∙2DMF ( 3 ), wetted by the different liquids indicated modest dependence of the luminescence of 2 and several examples of noticeable quenching of the luminesce in case of 3 .…”