Formation of Buckminsterfullerene and Its Perchlorinated Fragments by Laser Ablation of Perchloroacenaphthylene
摘要:
Perchloroacenaphthylene(C12Cl8), a perchlorinated polycyclic hydrocarbon composed of two hexagons and a pentagon, was ablated by a pulsed laser beam in a vacuum. The products created from the laser ablation were characterized by high-performance liquid chromatography coupled with atmospheric pressure chemical ionization mass spectrometry and rapid-scan ultraviolet spectrophotometric detection. Buckminsterfullerene C-60 and various perchlorinated carbon clusters have been observed among the products. The observation is helpful for understanding the formation mechanisms of fullerenes and suggests that the Pentagon Road scheme is feasible with the involvement of chlorines.
A series of perchlorinated fragments of buckminsterfullerene were prepared by glow discharge using chloroform vapor; their structural features are of significance in understanding the formation mechanism of fullerenes.
The title compound was prepared from the reaction of perchloroacenaphthylene with an excess of sodium salt of 4-methyloxythiophenol in toluene/ethanol (1:1) solvent and structurally characterized by single-crystal X-ray diffraction. The compound crystallizes in the Monoclinic space group P2(1) with the parameters: a = 10.351(1) Å, b = 20.453(3) Å, c = 12.1837(16) Å, β = 105.584(3)°, V = 2484.5(6) Å3, with Z = 2 formula units. The title compound 4,7-dichloro-1,2,3,5,6,8-hexakis-(4-methoxy-phenylsulfanyl)-acenaphthylene was synthesized from perchloroacenaphthylene C 12 Cl 8 with an excess of 4-methoxybenzene thiolate in toluene/ethanol (1:1) .
Formation of octachloroacenaphthylene in the pyrolysis of decachlorobiphenyl
作者:A. Bleise、E. Kleist、K. Günther、M.J. Schwuger
DOI:10.1016/s0045-6535(97)00110-0
日期:1997.8
The pyrolytic degradation of decachlorobiphenyl (PCB 209) in the temperature range of 700 - 1000 degrees C and at a pyrolysis time of 10 seconds generated one main chloroaromatic product. This compound has been identified by HPLC-UV, GC-MS, GC-FTIR and C-13-NMR as octachloroacenaphthylene (OCAN).The mechanism of the nearly quantitative formation of octachloroacenaphthylene (OCAN) occurs via a nonachlorobenzobarrylene radical (ZIR) as an intermediate followed by a rearrangement and further dechlorination to form OCAN, Calculations with the program THERM based on the Benson-group-theory indicated that this mechanism is not possible for lower or nonchlorinated biphenyls. (C) 1997 Elsevier Science Ltd.
Dodecachlorotetracyclo[7.2.1.02,8.05,12]dodeca-3,6,10-triene, a fully chlorinated valence isomer of [12]annulene
作者:V. N. Mallikarjuna Rao、Catherine J. Hurt、Kousuke Kusuda、Joseph C. Calabrese、Robert West