Five Lanthanide-Based Metal–Organic Frameworks Built from a π-Conjugated Ligand with Isophthalate Units Featuring Sensitive Fluorescent Sensing for DMF and Acetone Molecules

Abstract

Five novel lanthanide metal–organic frameworks constructed from a π-conjugated ligand with tetracarboxylate group, 5,5′-(naphthalene-1,5-diyl)­diisophthalic acid, have been synthesized solvothermally. Depend on the single-crystal X-ray diffraction data, the series of compounds exhibit 3D microporous framework architectures with two kinds of 1D open channels, giving the free volume about 36.5% calculated through PLATON. Room-temperature luminescent behaviors in the solid state reveal that compounds 2 (Eu-MOF) and 4 (Tb-MOF) exhibit the characteristic emissions of Eu­(III) and Tb­(III) benefiting from the excellent antenna effect of the ligand. It is noteworthy that the Eu-MOF, compound 2, has been proven to be treated as a fluorescent switch for DMF with more than 2-fold enhancement and acetone, which triggers a superior luminescence quenching giving an almost 100% quenching efficiency, based on sensitively turned on and turned off effects, respectively.

Fabrication of a Stable Europium-Based Luminescent Sensor for Fast Detection of Urinary 1-Hydroxypyrene Constructed from a Tetracarboxylate Ligand

“…In fact, considerable efforts have been dedicated to seeking simple and effective methods on detecting urinary 1-HP for the past few years. Benefitting from the fascinating fluorescent capabilities such as characteristic and strong emission peaks, long lifetimes, high quantum yields, and large Stokes shift, − metal–organic frameworks constructed from lanthanide (Ln-MOFs), especially Eu-centered and Tb-centered MOFs featuring the typical red or green luminescence of Eu­(III) and Tb­(III), have been successfully explored and widely applied in chemical sensors, covering metal ions, − anions, − organic molecules, − antibiotics, − temperature variation, and luminescent devices. − Yan’s group reported a luminescent Eu-doped Ga-MOF applied as a fast-responsive, highly sensitive, and selective sensor for detecting 1-HP . Liu and coworkers developed an Eu 3+ -incorporated Zn-MOF considered as a potential ratiometric luminescent probe for 1-HP .…”

Three-pole wheel paddle luminescent metal organic frameworks (LMOFs) based on the oxygen substituted triazine tricarboxylic acid ligand: recognition and detection of small drug molecules and aromatic amine molecules

“…[1][2][3][4] In particular, small organic molecules with high solubility and volatility can simply diffuse into air, soil and water, which poses a serious threat to the environment and health. [5][6][7][8] Organic amines, as important intermedi-ates, are commonly present in industrial production and have become a serious problem owing to their pollution of the environment and hazards to public health. 9 Therefore, it is particularly critical to develop reliable methods for trace detection of organic amines in industry and the environment.…”

Integration of Fluorescent Functionality into Pressure-Amplifying Metal–Organic Frameworks

“…The phenomenon was first predicted in 1998 as an attribute of the third generation of MOFs, which are also known as flexible MOFs or soft porous crystals . The dynamic behavior of soft porous crystals could be exploited in the last decades in a range of different applications like gas separation, − molecular sensing, − drug delivery, , and improved storage and release of gases, outperforming the rigid analogues. Different types of flexibility phenomena such as breathing, swelling, and subnetwork displacement have been described, , reflected in very specific adsorption characteristics and isotherm shapes …”