Tetraoxolene radical-bridged lanthanide SMM systems were prepared for the first time by reduction of the respective neutral compounds. Magnetic measurements reveal the profound influence of the radical center on magnetic behavior. Strong magnetic couplings are revealed in the radical species, which switch on SMM behavior under zero applied field for Dy^III and Tb^III compounds. HFEPR spectra unravel the contributions of the magnetic coupling and the magnetic anisotropy. For Gd^III this results in much more accurate magnetic coupling parameters with respect to bulk magnetic measurements.

We present the in-depth determination of the magnetic properties and electronic structure of the luminescent and volatile dysprosium-based single molecule magnet [Dy₂(bpm)(fod)₆] (Hfod = 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione, bpm = 2,2-bipyrimidine).

Al³⁺, Ga³⁺, In³⁺ and ligand 2,5-dihydroxyterephthalic acid (DHBDC) are used to construct the MIL-53 structure, which shows a sensing process based on the mechanism of excited state intramolecular proton transfer (ESIPT). The electron cloud density of the ligand in the framework is regulated by the metal, further adjusting the fluorescence sensing performance of the MOF. As the polarization of the metal weakens, the ligand-to-metal charge transfer ability weakens, the proton transfer ability of the DHBDC ligand increases, and the detection sensitivity increases. This rule was verified in the process of MIL-53-Al/Ga/In for N₂H₄ detection. The detection sensitivity and detection rate were ranked in the order MIL-53-In > MIL-53-Ga > MIL-53-Al. MIL-53-In was successfully applied to construct a high sensitivity, fast detection rate and reusable N₂H₄ sensor. This rule also laid the foundation for the construction of subsequent high-sensitivity fluorescence sensors. In addition, MIL-53-Al/Ga/In exhibits high-performance temperature sensing capabilities, which can achieve temperature sensing of 80–460 K.

Ultra-stable Zn-organic frameworks with controllable inverse adsorption separation of C ₂ H ₂ /CO ₂ demonstrate extraordinary CO ₂ -preferred selectivity and a remarkable productivity of C ₂ H ₂ with an extra-high purity of more than 99.9% from the CO ₂ /C ₂ H ₂ (1/99) mixture.