Preparation and characterization of carbonaceous matter rich in diamond-like carbon and carbyne moieties

The microstructure of carbonaceous matter prepared from copper acetylide, by a coupling reaction promoted by air, hydrogen peroxide or Cu(NH3)(n)(2+) oxidation has been studied by solid state C-13-NMR (CP/MAS), FT-IR and Raman spectroscopy. All three spectral techniques give clear evidences that the solid carbon produced contains sp-hybridized carbon chain moieties known as 'acetylenic carbyne' (polyene-type, IUPAC notation: polyethynylene). Solid state C13-NMR (CP/MAS) provides additional evidence on the presence of small cumulenic moiety 'allenic or cumulenic carbyne' (polycumulene-type, IUPAC notation polyethylenediylidene). Solid state C-13-NMR (CP/ MAS) in conjunction with Raman spectroscopy show sp(3)-hybridized carbon moieties known also as 'diamond-like carbon', formed by a crosslinking reaction of acetylenic carbyne chains; additionally sp(2)-hybridized carbon atoms were detected and assigned to amorphous and graphitic carbon. (C) 1999 Published by Elsevier Science S.A. All rights reserved.