Science. 1991 Apr 26;252(5005):548-51. doi: 10.1126/science.252.5005.548.
The toluene extract of the fluffy carbon material produced by resistive heating of graphite contains a variety of molecules larger than C(60) and C(70) in a total amount of 3 to 4% by weight. Repeated chromatography of this material on neutral alumina has led to the isolation of stable solid samples of C(76), C(84), C(90), and C(94). The characterization, which includes mass spectrometry, (13)C nuclear magnetic resonance, electronic absorption (ultraviolet/visible) and vibrational (infrared) spectroscopy identifies these all-carbon molecules as higher fullerenes. In addition, C(70)O, a stable oxide, has been isolated that is structurally and electronically closely related to D5h-C(70). This compound forms during the resistive heating process and probably has an oxygen atom inserted between two carbon atoms on the convex external surface of the C(70) skeleton.
电阻加热石墨产生的蓬松碳材料的甲苯提取物中，总重量含有 3%至 4%的各种大于 C(60)和 C(70)的分子。对该材料在中性氧化铝上的反复层析，导致了 C(76)、C(84)、C(90)和 C(94)的稳定固体样品的分离。这些全碳分子被鉴定为更高的富勒烯，其特征包括质谱、(13)C 核磁共振、电子吸收（紫外/可见）和振动（红外）光谱。此外，还分离出了稳定的氧化物 C(70)O，它在结构和电子上与 D5h-C(70)密切相关。该化合物在电阻加热过程中形成，可能在 C(70)骨架凸面外表面的两个碳原子之间插入了一个氧原子。
