title: Imaging nanometer metallocatalysts formed by photosynthetic deposition of water-soluble transition-metal compounds.
abstract: A method of imaging nanometer metallocatalysts formed by photosynthetic precipitation of the water-soluble transition-metal compounds [PtCl(6)](2-) and [RuCl(6)](2-) is reported. Hexachloroplatinate and hexachlororuthenate can accept up to four electrons from Photosystem I (PSI) reaction centers in photosynthetic thylakoid membranes, thereby converting [PtCl(6)](2-) and [RuCl(6)](2-) anions to either metallic platinum (Pt) and ruthenium (Ru) and/or partially oxidized nanometer catalysts at the reducing sides of PSI molecules. Use of this method can potentially create nanometer-sized Pt and/or bimetallic catalysts (such as Pt-Ru) on biomembranes and molecules at pH 7 and room temperature with preservation of the biological function of the molecules.
authors.affiliation: Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6194, USA.
authors.forename: James W
authors.initials: JW
authors.lastname: Lee
authors.forename: Ida
authors.initials: I
authors.lastname: Lee
authors.forename: Elias
authors.initials: E
authors.lastname: Greenbaum
mesh_terms: D002384:Catalysis; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D010788:Photosynthesis / Q000502:physiology*; D045331:Photosystem I Protein Complex / Q000737:chemistry / Q000378:metabolism; D010984:Platinum / Q000737:chemistry; D012428:Ruthenium / Q000737:chemistry; D020524:Thylakoids / Q000737:chemistry / Q000378:metabolism / Q000648:ultrastructure; D028561:Transition Elements / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D045331:Photosystem I Protein Complex; D028561:Transition Elements; D014867:Water; D010984:Platinum; D012428:Ruthenium