Long-lived highly emissive MOFs as potential candidates for multiphotonic applications

Abstract

Long-lived emissive materials based on room temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) are considered as the cornerstone of the development of optical sensors, security systems and solid-state...

A reversible room temperature phosphorescence/delayed fluorescence switch trigged by solvent exchange in a Ca-based coordination polymer

“…[23][24][25] To date, some CPs exhibiting interesting RTP properties have been reported. [19][20][21] However, most of the RTP properties are caused by the framework itself, [26][27][28][29][30][31] and the RTP properties caused by the guest molecules/ions themselves or RTP switching caused by guest changes are rare. [32][33][34] Considering the porous properties of many CPs, 31,35,36 it is undoubtedly of great significance to study the latter for the development of new sensor and switch materials.…”

Novel Approach for Detecting Vapors of Acids and Bases with Proton-Transfer Luminescent Dyes Encapsulated within Metal–Organic Frameworks

“…Metal organic frameworks (MOFs), a class of porous crystalline inorganic–organic hybrid materials, have been postulated as one of the most promising materials for sensing a vast number of different chemical compounds. − Their accessible porosity allows the diffusion of gases, VOCs, or molecules within their structure, favoring possible chemical interactions, and therefore inducing physical or chemical changes in their properties, that can be measured to quantify the amount of the analyte. A special subclass of MOFs that has gained much attention is the luminescent MOFs (LMOFs), which, in few words, are those MOFs capable of emitting light. − This type of LMOF has been widely employed in different scientific fields and potential technological applications such as cell bioimaging, − light-emitting devices, − anticounterfeiting or reversible writing and encoding, − and chemical detection. − Even though the number of LMOFs used for chemical sensing is rather elevated, most of these examples are based on the detection of chemicals in solutions; however, the detection of chemical compounds in the vapor phase is more scarce. ,− Hence, it is paramount to develop novel LMOF alternatives that enable the detection of chemical compounds in the vapor phase and that can be implemented in the development of sensors for being used in several industrial processes.…”

Coordinate Anchoring of Mixed Luminophores in Two Isostructural Hybrid Layers to Achieve Tunable Room-Temperature Phosphorescence

“…The combination of MOCs and RTP functionality provides opportunities to produce MOC-based RTP materials. The coordinate anchoring of various organic luminophores in distinct MOC systems to increase the rigidity and restrict the nonradiative transition gives birth to a series of captivating hybrid RTP materials and systematically investigates the influencing factors to optimize the resultant performances. − Generally, there are two categories of broadly investigated luminophore ligands to yield MOC-based RTP materials. The first is the rigid carboxylate derivative ligands.…”

“…Notably, tunable RTP properties were available via changing the categories of protonated organoamines. Paralleling the polydentate O ligands as luminophores, the locking of a triimidazole derivative in the metal–phosphite system produces assorted MOC-based RTP materials, and the RTP functionalities could be modulated via altering the categories of coordinated halogen ions and guest species. − Reviewing the references of MOC-based RTP materials implies that most of the products feature a single luminophore ligand. − Therefore, the locking of mixed luminophores in MOC systems may offer an avenue to modulate RTP performance of resulting isostructural products via ligand-directed substitution synthesis. As our continuous investigations on the generation of MOCs bearing tunable RTP properties, we, herein, anchored mixed luminophores, polydentate N ligand (1,3,5-tris­(2-methyl-1 H -imidazol-1-yl)­benzene, TIMB) and polydentate O ligands (2,5-dichloroterephthalic and 2,5-dibromoterephthalic acid, H 2 -X 2 -TPA), to produce isostructural MOCs, [Zn­(TIMB)­(X 2 -TPA)]·H 2 O ( 1 , X = Cl; 2 , X = Br), and modulate the RTP performances of resultant MOCs via the synergy of coordinate anchoring and substitution synthesis.…”