异质富勒烯C_(58)P_2的理论研究  

Theoretical Studies of P- Doped Fullerenne C_(58)P_2

作　　者：陈中方[1] 马克勤[1] 潘荫明[1] 赵学庄[1] 唐敖庆[2] 

机构地区：[1]南开大学化学系,天津300071 [2]吉林大学理论化学研究所,长春130023

出　　处：《高等学校化学学报》1999年第12期1921-1925,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金!(批准号:297730 22)资助课题

摘　　要：用 MNDO半经验方法研究了异质富勒烯 C58P2 各异构体的结构和相对稳定性 .结果表明 ,1,4 -位取代的异构体最稳定 ,异构体的稳定性随杂原子间距离的增加而降低 .C58P2 分子的稳定性比全碳富勒烯 C60 低 ,但仍具有相当的稳定性 ,是潜在的合成目标 .杂原子磷的掺杂改善了富勒烯的氧化还原性能 .考察了各异构体的整体硬度和绝对电负性 。A systematic study on the molecular structures and relative stabilities of all the possible C 58 P 2 isomers has been performed by using the semiempirical MNDO method. The most stable isomer of C 58 P 2 was obtained, and the static properties such as the heats of formation, HOMO LUMO gap energies, heats of atomization, ionization potentials, affinity energies, absolute electronegativities and global hardness have been predicted theoretically. The calculation results show that the P doped fullerene C 58 P 2 has a considerable stability and is the potential synthesis target, though it is less stable than its carbon analogue. The isomer 7 corresponding to 1,4 substitution to the cyclohexatriene unit is the most stable isomer for C 58 P 2. The stabilities decrease with increasing the distance between the heteroatoms. The redox characteristics of C 60 can be enhanced by doping phosphorus atoms. Based on the absolute electronegativities, the electron transfer directions in dimmer formed by C 60 and its doped fullerenes are predicted.

关 键 词：碳60 富勒烯 异质富勒烯 构型 生成热 电离势 

分 类 号：O635.1[理学—高分子化学] O641.12[理学—化学]