[Ag2(aca)2]n and [Ag4(aca)4(NH3)2] (acaHÂ =Â 9-anthracenecarboxylic acid): Synthesis, X-ray crystal structures, antimicrobial and anti-cancer activities

[Ag2(9-aca)2]n (9-acaH = 9-anthracenecarboxylic acid) has polymeric ribbons of linked disilver(I) bridged dicarboxylate units. [Ag4(9-aca)4(NH3)2] has two syn-syn and two syn-anti bridging carboxylates, and two Ag(I) ions are each bonded to an NH3. In vitro, both complexes are cytotoxic against human microbial pathogens and two mammalian cancer cell lines.