Two fluorescent silver(I)–saccharinato complexes of 2-methylpyrazine and pyrazine-2-carboxamide with Ag⋯Ag interactions

Two new silver(I)–saccharinato (sac) complexes [Ag4(sac)4(mpyz)2(H2O)2] (1), and [Ag2(sac)2(pyzca)2] (2), (mpyz = 2-methylpyrazine, pyzca = pyrazine-2-carboxamide) have been synthesized and structurally characterized. Bridging of silver(I) centers by sac ligands results in argentophilic contacts of 3.192(1) Å for 1, and 3.168(2) Å for 2. These Ag⋯Ag interactions were discussed in terms of bond distances and angles around the silver(I) ion. Both complexes exhibit strong blue luminescence at room temperature in the solid state.