An unusual three-dimensional self-penetrating network derived from cross-linking of two-fold interpenetrating nets vialigand-unsupported Ag–Ag bonds: synthesis, structure, luminescence, and theoretical study

Abstract

A novel coordination polymer Ag₄L₂(4,4′-bpy)(H₂O)₂·6H₂O (1) (H₂L = bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxydiimide, 4,4′-bpy = 4,4′-bipyridine) has been synthesized and characterized by IR spectroscopy, elemental analysis, X-ray powder diffraction and single-crystal X-ray diffraction. Compound 1 exhibits a two-fold interpenetrated array. Remarkably, adjacent sets of 2D interpenetrating sheets are ultimately cross-linked into an unusual three-dimensional self-penetrating network when ligand-unsupported Ag–Ag bonds are taken into account. Theoretical computational methods were applied to further identify argentophilic interactions in this structure. Additionally, thermal stability analysis and luminescent property of this compound are also studied in this paper.