Endohedrale und derivatisierte Fullerene sowie kleine Kohlenstoff-Cluster Abschlussbericht

The search for endohedral fullerene compounds in the carbon of cast iron alloys (Levitskii-Dozmerov-method) was carried out in the hope to develop a more effective production method for these technically interesting cage compounds. Although the carbon seems to contain fullerene structures, no significant amounts of extractable empty and endohedral fullerenes could be found. Therefore, this method seems technically uninteresting. Selective functionalzations of C_6_0 were successfully carried out with the help of hydrozirconation. The chemical attack occurred at a 6,6 doublebond of the C_6_0 cage. The derivatives (C_6_0H_2, C_6_0C_5H_5Br, C_6_0C_5H_5OH, C_6_0C_5H_7Br, C_6_0C_5H_7OH, C_6_0C_5H_6) could be characterized completely. To study the first steps of fullerene-formation, the small molecules of carbon vapor C_n (with n=1,2,3) were isolated in cryogenic matrices of argon-ice and studied by optical spectroscopy. Upon thermal annealing of the matrices, the molecules diffuse within the matrix and combine to larger units. The growth of molecules could be followed spectroscopically up to a range C_n (with n,15). However, the assignment of the spectra to specific clusters is often difficult because of the limited knowledge of the carbon molecular spectra. (orig.)Available from TIB Hannover: F95B2005+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

One-step synthesis of fullerene hydride C60H2 via hydrolysis of acylated fullerenes

The hitherto unexplored class of acylated fullerene compounds has been shown to be excellent C60H2 precursors. Upon a simple treatment with basic Al2O3, they are hydrolyzed quantitatively into C60H2, This key feature led to the development of a new, straightforward protocol for the selective synthesis of the simplest [60] fullerene hydride, C60H2. This protocol may offer an advantageous alternative to previously known methods for the synthesis of C60H2 allowing for a rapid access to C60H2 in good yield and high purity without tedious separating processes