Novel networks of silver(I) cations assembled with 2,3-pyridinedicarboxylic acid: From 2D sheet to 3D network

Two novel [Ag2pyd]n (1) and [Ag4(apyz)3 (pyd)2·3H2O]n (2) supramolecular frameworks constructed by H2pyd (2,3-pyridinedicarboxylic acid) were synthesized and characterized by X-ray single crystal diffraction, elemental analyses and IR spectra. The pyd building block was extended into well-ordered supramolecular frameworks by AgO and Ag···Ag interaction. Ligand-supported weak argentophilic interactions are observed in compounds 1 and 2, but novel 1D Ag···Ag silver-wire structure is only in 1. The linkers of pyd and apyz (aminopyrazine) play an important role in the self-assembly process. The combination of pyd ligands and Ag ions generate a 2D layer structure in complex 1 and pyd ligands adopt different coordination modes to connect Ag atoms to form 3D supramolecular framework in complex 2. Comparing the experimental results, it is clear that the apyz ligand plays a crucial role in the formation of the resulting structures. The results are reported in this article.