title: An encapsulated helical one-dimensional cobalt iodide nanostructure.
abstract: Single-walled carbon nanotubes (SWNTs) can be used as templates for the growth of low-dimensional inorganic materials whose structures and properties often differ greatly from those of the bulk. Here we describe the detailed crystallography of an entire helical one-dimensional cobalt diiodide nanostructure encapsulated within a SWNT. This material has an unprecedented twisted double tetrahedral chain structure arising from a rotation of Co(2)I(4) units along its length. The complete nanostructure comprises two distinct regions with oppositely handed helices separated by a short disordered region. The encapsulating SWNT shows a commensurate ovoid distortion reflecting an unexpectedly strong interaction between the nanostructure and the SWNT.
authors.affiliation: Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
authors.forename: Eilidh
authors.initials: E
authors.lastname: Philp
authors.forename: Jeremy
authors.initials: J
authors.lastname: Sloan
authors.forename: Angus I
authors.initials: AI
authors.lastname: Kirkland
authors.forename: Rüdiger R
authors.initials: RR
authors.lastname: Meyer
authors.forename: Steffi
authors.initials: S
authors.lastname: Friedrichs
authors.forename: John L
authors.initials: JL
authors.lastname: Hutchison
authors.forename: Malcolm L H
authors.initials: ML
authors.lastname: Green
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D003198:Computer Simulation; D003460:Crystallization / Q000295:instrumentation / Q000379:methods*; D003461:Crystallography / Q000379:methods*; D007454:Iodides / Q000737:chemistry*; D046911:Macromolecular Substances; D008855:Microscopy, Electron, Scanning; D008958:Models, Molecular; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D007454:Iodides; D046911:Macromolecular Substances; D037742:Nanotubes, Carbon; D003035:Cobalt