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摘要:
Eighteen possible isomers of C78(CH2)2 were investigated by the INDO method. It was indicated that the most stable isomer was 42,43,62,63-C78(CH2)2, where the -CH2 groups were added to the 6/6 bonds located at the same hexagon passed by the longest axis of C78 (C2v), to form cyclopropane structures. Based on the most stable four geometries of C78(CH2)2 optimized at B3LYP/3-21G level, the first absorptions in the electronic spectra calculated with the INDO/CIS method and the IR frequencies of the C-C bonds on the carbon cage computed using the AM1method were blue-shifted compared with those of C78 (C2v) because of the bigger LUMO-HOMO energy gap and the less conjugated carbon cage after the addition. The chemical shifts of 13C NMR for the carbon atoms on the added bonds calculated at B3LYP/3-21G level were moved upfield thanks to the conversion from sp2-C to sp3-C.
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来源期刊 中国化学(英文版) 学科
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年,卷(期) 2007,(2) 所属期刊栏目
研究方向 页码范围 149-153
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中国化学(英文版)
月刊
1001-604X
31-1547/O6
16开
上海市枫林路354号
4-646
1983
eng
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