A supramolecular octahedron assembled by anion coordination and π‒π stacking interactions showing dual emission

• Published in: Journal of molecular structure 2024-06, Vol.1305, p.137721, Article 137721
• Main Authors: Zhou, Xin-Nan, Yang, Xin, Lu, Zi-Xiu, Nan, Zi-Ang, Huang, You-Gui
• Format: Article
• Language: English
• Subjects: Anion coordination; Dual emission; Octahedra; Self-assembly; π‒π interaction
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2024.137721

•A supramolecular octahedron {[CuLCl]⋅Cl⋅(fpn)}6 was assembled by anion coordination and π···π stacking interactions.•The structure of the octahedron is prabably stable in solution as illustrated by HR-MS analysis.•The luminescence of [CuLCl]+ and fpn is preserved in the octahedron leading to dual emissions. Inspired by the molecular self-assembly in biological systems, chemists design and synthesize artificial discrete structures to mimic the biological complexity and functionality. Most efforts focus on the metal-ligand driven self-assembly to produce complicated metal-organic cages, while discrete polyhedral self-assemblies constructed by weak intermolecular interactions such as hydrogen bonding and π‒π stacking interactions are extremely rare. Herein, we report a supramolecular octahedron {[CuLCl]⋅Cl⋅(fpn)}6 (1) (L = tris(2-naphthimidazolylmethyl) amine, fpn = 5-fluoroisophthalonitrile) in solid state arising from the self-assembly of [CuLCl]+, Cl‒, and fpn in CH3CN. In the octahedron, [CuLCl]+ cations occupying the vertexes of the octahedron are connected by Cl‒ and fpn on edges via hydrogen bonding and π‒π stacking interactions, respectively. Compound 1 in both solid and solution states shows dual emissions which originate from fpn and [CuLCl]+, respectively. A supramolecular octahedron assembled via anion coordination and π···π stacking interactions shows dual emissions. [Display omitted]