A Terminal Fluoride Ligand Generates Axial Magnetic Anisotropy in Dysprosium Complexes

International audienceThe first dysprosium complexes with a terminal fluoride ligand are obtained as air-stable compounds. The strong, highly electrostatic dysprosium-fluoride bond generates a large axial crystal-field splitting of the J=15/2 ground state, as evidenced by high-resolution luminescence spectroscopy and correlated with the single-molecule magnet behavior through experimental magnetic susceptibility data and ab initio calculations

Collington Square Play Space

Project for LARC340 - Site Planning and Design Studio (Fall 2023). University of Maryland, College ParkCollington Square Play Space is located in the Broadway East Community in Baltimore, which belongs to Maryland Legislative House District 45. It is also located next to Collington Square (CS) Elementary School, CS Recreation and CS Park. It is currently designed as a play space. However, there is only a broken swing set and rundown play structure in the play space. For this assignment, students were asked to redesign the Collington Square Play Space. Students were asked to develop design solutions that: • Provided good trees that give shade and combat heat island effect • Incorporated more swings • Provided more lighting for night • Created a smart park with digital access for children • Provided a social gathering space for picnics • Provided an opportunity for children to ride their bikes • Addressed residents’ concerns about safety • Improved stormwater treatment • Added ADA Accessibility to the ParkBaltimor

Formation of the layered conductive magnet CrCl₂(pyrazine)₂ through redox-active coordination chemistry

International audienceThe unique properties of graphene, transition-metal dichalcogenides and other two-dimensional (2D) materials have boosted interest in layered coordination solids. In particular, 2D materials that behave as both conductors and magnets could find applications in quantum magnetoelectronics and spintronics. Here, we report the synthesis of CrCl2(pyrazine)2, an air-stable layered solid, by reaction of CrCl2 with pyrazine (pyz). This compound displays a ferrimagnetic order below ∼55 K, reflecting the presence of strong magnetic interactions. Electrical conductivity measurements demonstrate that CrCl2(pyz)2 reaches a conductivity of 32 mS cm–1 at room temperature, which operates through a 2D hopping-based transport mechanism. These properties are induced by the redox-activity of the pyrazine ligand, which leads to a smearing of the Cr 3d and pyrazine π states. We suggest that the combination of redox-active ligands and reducing paramagnetic metal ions represents a general approach towards tuneable 2D materials that consist of charge-neutral layers and exhibit both long-range magnetic order and high electronic conductivity