Hydrogenation of C60 at 2 GPa Pressure and High Temperature.

• Hydrogenation of C60 at 2 GPa and 723–823 K was performed with thermal decomposition of LiAlH4 as a hydrogen source. Analysisof hydrogenation products showed that the method can produce not only C60H36, but also hydrofullerides C60Hx with 44 < x < 52.Unlike other hydrogenation methods in which pristine C60 reacts with hydrogen, the high pressure/high temperature conditions resultfirst in C60 polymerization into a tetragonal phase which later reacts with hydrogen. It is suggested that hydrogen first attacks intermolecularcarbon–carbon bonds, resulting in complete depolymerization of C60 at a later stage of the hydrogenation process. This modelsuggests the possibility to select starting points for hydrogenation by choosing specific polymeric structures of C60. Hydrogenated polymericC60 was identified as an intermediate reaction product. Characterization of highly reduced material was performed by Raman andIR spectroscopy, X-ray diffraction, and atmospheric pressure photoionization Fourier transform ion cyclotron resonance massspectrometry.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Keyword

Fullerenes

C60

hydrogenation

hydrogen compound

high pressure

high temperature

hydrofullerides

C60H36

Raman spectroscopy

IR

XRD

mass spectrometry

Condensed matter physics

Kondenserade materiens fysik

Publication and Content Type

ref (subject category)

art (subject category)