Multiple Coordination of Chromium Ion Luminescence: A Strategy for Designing Ultra-broadband NIR Long Persistent Luminescent Materials.

Near-infrared (NIR) long persistent luminescent (LPL) materials have attracted the interest of many researchers as they have potential applications in many aspects. However, majority of studies on Cr ion-doped LPL materials have focused on Cr in an octahedral site, and the luminescence is limited to the short-wavelength NIR-I region (700-900 nm), which is detrimental to fully explore Cr ion-doped LPL materials with potential applications. In this work, a novel ultra-broadband NIR LPL material, NaCaGeO (NCGO):x%Cr, was successfully designed and synthesized, covering the luminescence range of 600-1200 nm and having the best afterglow duration of more than 10 h.

Fabrication of (4, 10) and (4, 12)-Connected Multifunctional Zirconium Metal-Organic Frameworks for the Targeted Adsorption of a Guest Molecule.

Following the principle of a topology guide, a zirconium MOF (PCN-207) based on the HTPTA ligand (tetramethyl(4,4',4″,4‴-(pyrazine-2,3,5,6-tetrayl))tetrabenzoic acid) with symmetry and an 8-connected Zr(μOH)(OH)] cluster with symmetry has been synthesized. PCN-206 can also be obtained by modulating the benzoic acid usage to change the flexibility of the HTPTA ligand. The unique positions of 8-connected Zr clusters in the and networks and the flexibility of the tetratopic primary linker enable the precise insertion of fumarate (FA), 1,4-benzenedicarboxylic acid (HBDC), and even 2,6-naphthalenedicarboxylic acid (HNDC) in a one-pot reaction.