Addition of HCl, Cl_2, CoCl_2 and KI to fullerene-forming benzene/oxygen/argon flames

摘要

Gaseous HCl and Cl_2 as well as CoCl_2 centre dot 6H_2O and KI dissolved in methanol were added to fullerene-forming flat benzene/oxygen/argon flames burning at 75 mbar. The soot formed in the flames was collected and analysed by mass spectrometry using chemical ionization with CH_4/N_2O. In the case of HCl or Cl_2 addition no formation of halogenated fullerenic compounds was observed, while the measurement of chlorine precursor mass spectra showed the formation of a great number of chlorine-containing compounds, essentially polycyclic aromatic hydrocarbons (PAHs). The addition of CoCl_2 centre dot 6H_2O led to the formation of C_60OHCl by means of ion-molecule reactions in the flame. After addition of CoCl_2 centre dot 6H_2O or KI, molecular masses corresponding to metal fullerene compounds like CoC_58, CoC_84, CoC_92 and CoC_134 or K_2C_56 and K_2C_66 were observed.