title: Structural studies of lanthanide ion complexes of pure gold, pure silver and mixed metal (gold-silver) dicyanides.
abstract: Crystal structures of four lanthanide complexes of La[Au(CN)2](3).3H2O, La[Ag(CN)2](3).3H2O, La[Ag(0.83)Au(0.17)(CN)2](3).3H2O, and La[Ag(0.39)Au(0.61)(CN)2](3).3H2O are reported. Studies reveal that all the structures reported are isostructural. All systems were found to be in the hexagonal crystal system, space group P6(3)/mcm. The metal-metal distance for the pure gold system is 3.332 (1) A versus 3.359(1) A for the pure silver system. The mixed-metal systems have shown no distinct differences in the location of the metal atoms, with the La[Ag(0.83)Au(0.17)(CN)2](3).3H2O complex having a metal-metal Ag-Au separation of 3.346(1) A, and 3.344(1) A for the La[Ag(0.39)Au(0.61)(CN)2](3).3H2O complex. The crystal structures of the pure and mixed La complexes have been solved to provide evidence of Ag-Au heterometallic interactions and as a basis for understanding the interesting optical properties of the systems.
authors.affiliation: Department of Chemistry, University of Maine, Orono, ME 04469, USA.
authors.forename: Julie Clarissa F
authors.initials: JC
authors.lastname: Colis
authors.forename: Christie
authors.initials: C
authors.lastname: Larochelle
authors.forename: Richard
authors.initials: R
authors.lastname: Staples
authors.forename: Regine
authors.initials: R
authors.lastname: Herbst-Irmer
authors.forename: Howard
authors.initials: H
authors.lastname: Patterson
mesh_terms: D018360:Crystallography, X-Ray; D003486:Cyanides / Q000737:chemistry* / Q000378:metabolism; D006046:Gold / Q000737:chemistry* / Q000378:metabolism; D028581:Lanthanoid Series Elements / Q000737:chemistry* / Q000378:metabolism; D008024:Ligands; D012834:Silver / Q000737:chemistry* / Q000378:metabolism
chemical_list: D003486:Cyanides; D028581:Lanthanoid Series Elements; D008024:Ligands; D012834:Silver; D006046:Gold