title: Synthesis and linkage isomerization of thiolato-bridged Ru(II)Ag(I)Ru(II) trinuclear complex with D-penicillaminate.
abstract: The reaction of [Ru(solvent)(2)(bpy)(2)](2+) (bpy = 2,2'-bipyridine) with D-H(2)pen (D-penicillamine) in ethanol/water in the presence of Ag(+) gave a thiolato-bridged Ru(II)Ag(I)Ru(II) trinuclear complex, [Ag{Ru(D-Hpen)(bpy)(2)}(2)](3+) ([1](3+)), in which two octahedral [Ru(II)(D-Hpen)(bpy)(2)](+) units are linked by a linear Ag(I) ion. Of three possible isomers (Delta(D)Delta(D), Delta(D)Lambda(D), and Lambda(D)Lambda(D)), [1](3+) formed the Delta(D)Delta(D) and Lambda(D)Lambda(D) isomers that were separately isolated by fractional crystallization with the use of [Sb(2)(R,R-tartrato)(2)](2-). In [1](3+), each D-Hpen ligand chelates to a Ru(II) center through thiolate and carboxylate groups, while an amine group of D-Hpen is protonated and does not participate in the coordination. On refluxing in ethanol/water, the Delta(D)Delta(D) isomer of [1](3+) was converted to Delta(D)Delta(D)-[2](3+), in which each D-Hpen ligand chelates to a Ru(II) center through thiolate and amine groups with a non-coordinating carboxyl group. On the other hand, a similar thermal linkage isomerization was not noticed for the Lambda(D)Lambda(D) isomer of [1](3+) under the same conditions. The isolated Delta(D)Delta(D)-[1](3+), Lambda(D)Lambda(D)-[1](3+), and Delta(D)Delta(D)-[2](3+) were fully characterized by electronic absorption, CD, and NMR spectroscopies, along with single-crystal X-ray crystallography for Lambda(D)Lambda(D)-[1](3+) and Delta(D)Delta(D)-[2](3+).
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
authors.forename: Motoshi
authors.initials: M
authors.lastname: Tamura
authors.forename: Masakazu
authors.initials: M
authors.lastname: Yamagishi
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Kawamoto
authors.forename: Asako
authors.initials: A
authors.lastname: Igashira-Kamiyama
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Tsuge
authors.forename: Takumi
authors.initials: T
authors.lastname: Konno
mesh_terms: D002614:Chelating Agents / Q000737:chemistry; D002942:Circular Dichroism; D003545:Cysteine / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry; D007536:Isomerism; D015394:Molecular Structure; D010396:Penicillamine / Q000737:chemistry*; D010472:Perchlorates / Q000737:chemistry; D012428:Ruthenium / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013237:Stereoisomerism; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D002614:Chelating Agents; D010472:Perchlorates; D013438:Sulfhydryl Compounds; D014867:Water; D000431:Ethanol; D012834:Silver; D012428:Ruthenium; D010396:Penicillamine; D003545:Cysteine