Supramolecular frameworks constructed from angular-shaped sulfonyldipyrazine and various silver(i) salts

Abstract

The new angular-shaped multidentate ligand sulfonyldipyrazine (abbreviated as L) is capable of forming diverse coordination polymeric motifs with various silver(I) salts, such as the infinite chain structure of [Ag₃(L)(NO₂)₃]_∞, (4,4) net of isomorphous {[Ag(L)](ClO₄)}_∞ and [Ag(L)(NO₃)]_∞, and three-dimensional frameworks of [Ag(L)(CF₃SO₃)]_∞ and [Ag(L)(CF₃CO₂)]_∞. In these complexes, sulfonyldipyrazine exhibits flexible ligation modes with its pyrazinyl N atoms bound to adjacent metal centers. The electron-deficient pyrazinyl rings and the sulfonyl group at the bend provide additional bonding sites for unconventional interactions, such as anion–π(pyrazinyl) and SO⋯π(pyrazinyl) interactions, in the supramolecular assembly of these complexes.