title: Synthesis and structure of a water-soluble hexanuclear silver(I) nicotinate cluster comprised of a "cyclohexane-chair"-type of framework, showing effective antibacterial and antifungal activities: use of "sparse matrix" techniques for growing crystals of water-soluble inorganic complexes.
abstract: The synthesis of a water-soluble anionic silver 2-mercaptonicotinate complex having effective antibacterial and antifungal properties is described. Its structure has been confirmed to be a hexameric cluster by an X-ray diffraction analysis of a mixed Na(+)/Tris(+) salt (Tris(+) = tris(hydroxymethyl)methylammonium cation). The [Ag(mna)](6)(6-) cluster has a Ag(6)S(6) core and an overall shape of twisted hexagonal cylinder with six sulfur atoms and six silver atoms alternating on a puckered drum-like surface. Each Ag atom is trigonally coordinated by one N and two S ligands. The overall [Ag(mna)](6)(6-).4Na(+).2[(HOCH(2))(3)CNH(3)](+).10H(2)O complex has a layered appearance in the crystal packing diagram, with a [Ag(mna)](6)(-) cluster layer alternating with a solvent layer consisting of sodium atoms, Tris buffer cations, and water molecules. The structure is almost identical to that of a neutral [Ag(Hmna)](6) complex reported earlier. The neutral and charged complexes are both known to possess antimicrobial activities, and some biological properties of these and related compounds are briefly discussed in this paper.
authors: Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA.
authors: Irina
authors: I
authors: Tsyba
authors: Becky Bun-Kit
authors: BB
authors: Mui
authors: Robert
authors: R
authors: Bau
authors: Ryusuke
authors: R
authors: Noguchi
authors: Kenji
authors: K
authors: Nomiya
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry; D000935:Antifungal Agents / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D003510:Cyclohexanes / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009525:Niacin / Q000031:analogs & derivatives / Q000138:chemical synthesis* / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D012995:Solubility
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D003510:Cyclohexanes; D009942:Organometallic Compounds; C482917:silver 2-mercaptonicotinate; D009525:Niacin