Poly[[{μ 3-2-[4-(2-hydroxyethyl)piperazin-1-yl] ethanesulfonato}-silver(I)] trihydrate]

Abstract

Ethanesulfonic acidbased buffers like 2-[4-(2-hydroxyethyl)-piperazin-1-yl] ethanesulfonic acid (HEPES) are commonly used in biological experiments because of their ability to act as noncoordinating ligands towards metal ions. However, recent work has shown that some of these buffers may in fact coordinate metal ions. The title complex, {[Ag(C 8H 17N 2O 4S)]·3H 2O} n, is a metalorganic framework formed from HEPES and a silver(I) ion. In this polymeric complex, each Ag atom is primarily coordinated by two N atoms in a distorted linear geometry. Weaker secondary bonding interactions from the hydroxy and sulfate O atoms of HEPES complete a distorted seesaw geometry. The crystal structure is stabilized by O - H⋯O hydrogenbonding interactions.