A silver(I) sulfide species is now imbedded in a porous coordination network. Such a composite system builds on the molecule tetrakis(methylthio)-1,4-benzenedicarboxate that holds out the hard carboxylate to europium(III) to form a host net, while taking on AgCl using its soft sulfur side arms. AgCl is then treated with H2S to form the dark-colored Ag2S species, while leaving the hard host net intact and upstanding. This hard soft duality serves to conjoin the rich electronic flavors of metal chalcogenides and the flexible textures of coordination nets.