Accession Number : ADA193125

Title :   The Structures of Self-Assembled Monolayer Films of Organosulfur Compounds Adsorbed on Gold Single Crystals: Electron Diffraction Studies.

Descriptive Note : Interim rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MASS DEPT OF CHEMISTRY

Personal Author(s) : Strong, Lou ; Whitesides, George M

PDF Url : ADA193125

Report Date : Jan 1988

Pagination or Media Count : 66

Abstract : Transmission electron microscopy and diffraction have been used to study the packing arrangements of docosyl thiol (RSH), didocosyl sulfide (RSR), and didocosyl disulfide (RSSR) on gold single crystal foils. The specimens include gold films in (100) and (111) orientations. Docosyl thiol and didocosyl disulfide adsorbed on (111) faces assemble in coincidence lattice structures yielding hexagonal overlayers c(7 x 7) in which the short interchain distance indicates freely rotating methylene chains. On a (100) surface both alkyl groups exhibit an in-plane structure consisting of a base-centered square array in which the interchain distance implies a hindered chain movement. We have presented evidence that substrate crystallography does control the packing of monolayer alkyl sulfides adsorbed from the solution phase.

Descriptors :   *ORGANIC SULFUR COMPOUNDS, *THIN FILMS, *MOLECULAR STRUCTURE, *SURFACE CHEMISTRY, ALKYL RADICALS, CRYSTALLOGRAPHY, DIFFRACTION ANALYSIS, ELECTRON DIFFRACTION, ELECTRON MICROSCOPY, FOILS(MATERIALS), GOLD, LAYERS, METHYLENES, ROTATION, SINGLE CRYSTALS, SOLUTIONS(GENERAL), SUBSTRATES, SULFIDES, TRANSMITTANCE

Subject Categories : Physical Chemistry
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE