Two Fluorescent Silver(I)-Saccharinato Complexes of 2-Methylpyrazine and Pyrazine-2-Carboxamide with Ag⋯Ag Interactions

Abstract

Two new silver(I)-saccharinato (sac) complexes [Ag<inf>4</inf>(sac)<inf>4</inf>(mpyz)<inf>2</inf>(H<inf>2</inf>O)<inf>2</inf>] (1), and [Ag<inf>2</inf>(sac)<inf>2</inf>(pyzca)<inf>2</inf>] (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. © 2008 Elsevier B.V. All rights reserved.