Self-Assembled Tetrahedral [Cr^III₄L₆]¹²⁺ Cage Displaying Near-Infrared Spin-Flip Photoluminescence.

ABSTRACT: The thermodynamically controlled self-assembly of bis-bidentate quaterpyridine ligand, L = 2,2':5',5″:2″,2‴-quaterpyridine, with Cr^II and subsequent oxidation to Cr^III yields the first photoluminescent tetrahedral [Cr^III₄L₆]¹²⁺ molecular cage. Single-crystal X-ray diffraction reveals the presence of two homochiral cages (ΛΛΛΛ and ΔΔΔΔ) in the unit cell that crystallize as a racemic mixture. Additionally, a PF₆ anion is observed inside the cavity, in line with isostructural cages built with Ni^II or Fe^II. Each corner of the polyhedron is occupied by weakly antiferromagnetically coupled {Cr(bipy)₃}³⁺ (bipy = 2,2'-bipyridine) patterns, as revealed by magnetometry. Upon light

SUBMITTER: Ye Y 

PROVIDER: S-EPMC12305491 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature