Recent detections of C60,C70,and C60^+ in space induced extensive studies of fullerene derivatives in circumstellar environments.As the promising fullerene sources,protoplanetary nebulae(PPNe)shows a number of unident...Recent detections of C60,C70,and C60^+ in space induced extensive studies of fullerene derivatives in circumstellar environments.As the promising fullerene sources,protoplanetary nebulae(PPNe)shows a number of unidenti ed bands in their infrared spectra,among which a small sample exhibits an enigmatic feature at ~21μm.Hydrogenation converts fullerenes into fulleranes,which breaks the symmetry of fullerene molecules and produces new infrared bands.In this work,we investigate the possibility of fulleranes(C60Hm)as the carrier of the 21μm feature in terms of theoretical vibrational spectra of fulleranes.The evidences favoring and disfavoring the fullerane hypothesis are presented.We made an initial guess for the hydrogen coverage of C60Hm that may contribute to the 21μm feature.展开更多
Novel essentially distinct from already known (methods of hydrogenation of fullerenes (C60 and C70) or fullerite) method for the synthesis of highly hydrogenated carbon molecules is developed;such approach is perspect...Novel essentially distinct from already known (methods of hydrogenation of fullerenes (C60 and C70) or fullerite) method for the synthesis of highly hydrogenated carbon molecules is developed;such approach is perspective hydrogen capacity accumulators. First, the reactionary conditions are created for the realization of the process of fullerenization as direct transformation of molecules of aromatic hydrocarbons, pyridine and ethanol into carbon molecules, fulleranes (С60Н8-С60Н60 and С70Н8-С70Н44) and quasi-fulleranes (CnHn-6-CnHn-2 (n = 20 - 46)) containing up to 5.7 wt% hydrogen. X-ray amorphous powders of hydrogenated carbon molecules in gram amounts are obtained. Appreciable dehydrogenation of such samples of fulleranes and quasi-fulleranes at ~50°C is began, while dehydrogenation of synthesized from fullerene (or fullerite) fulleranes is observed only at temperatures above 400°C. Methods of NMR, IR spectroscopy, mass spectrometry MALDI and temperature-programmed desorption mass spectrometry EI are used for the study of condensed products of fullerenization of precursors molecules.展开更多
基金the National Natural Science Foundation of China(No.11973099)I also acknowledge the Science and Technology Development Fund of Macao Special Adminastrative Region for support through grant 0007/2019/A.
文摘Recent detections of C60,C70,and C60^+ in space induced extensive studies of fullerene derivatives in circumstellar environments.As the promising fullerene sources,protoplanetary nebulae(PPNe)shows a number of unidenti ed bands in their infrared spectra,among which a small sample exhibits an enigmatic feature at ~21μm.Hydrogenation converts fullerenes into fulleranes,which breaks the symmetry of fullerene molecules and produces new infrared bands.In this work,we investigate the possibility of fulleranes(C60Hm)as the carrier of the 21μm feature in terms of theoretical vibrational spectra of fulleranes.The evidences favoring and disfavoring the fullerane hypothesis are presented.We made an initial guess for the hydrogen coverage of C60Hm that may contribute to the 21μm feature.
文摘Novel essentially distinct from already known (methods of hydrogenation of fullerenes (C60 and C70) or fullerite) method for the synthesis of highly hydrogenated carbon molecules is developed;such approach is perspective hydrogen capacity accumulators. First, the reactionary conditions are created for the realization of the process of fullerenization as direct transformation of molecules of aromatic hydrocarbons, pyridine and ethanol into carbon molecules, fulleranes (С60Н8-С60Н60 and С70Н8-С70Н44) and quasi-fulleranes (CnHn-6-CnHn-2 (n = 20 - 46)) containing up to 5.7 wt% hydrogen. X-ray amorphous powders of hydrogenated carbon molecules in gram amounts are obtained. Appreciable dehydrogenation of such samples of fulleranes and quasi-fulleranes at ~50°C is began, while dehydrogenation of synthesized from fullerene (or fullerite) fulleranes is observed only at temperatures above 400°C. Methods of NMR, IR spectroscopy, mass spectrometry MALDI and temperature-programmed desorption mass spectrometry EI are used for the study of condensed products of fullerenization of precursors molecules.
