Encapsulation and convex-face thiozonolysis of triatomic sulfur (S(3)) with carbon nanotubes.

Encapsulation and convex-face thiozonolysis of triatomic sulfur (S(3)) with carbon nanotubes.
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DOI:
10.1002/poc.1866
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发表时间:
2012-01-01
影响因子:
1.8
通讯作者:
Greer, Alexander
Greer, Alexander
中科院分区:
化学4区
文献类型:
--
作者:
Castillo, Alvaro;Lee, Leda;Greer, Alexander

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纳米管是一类越来越多地被用来包裹不稳定分子的主体空腔,但还没有一个被利用来容纳活性硫物种,如硫臭氧(S3)。本文采用密度泛函理论和(ONIOM)计算方法,计算了单壁碳纳米管(SWNT)与硫代臭氧的结合反应,确定了1,2,3-硫代氮化物形成的时间。S3的C2v形式异构化为D3h形式的纳米管直径选择性被证明是难以捉摸的。非环C2vS3比环状D3HS3更稳定,无论它是游离的还是包埋在SWNT中的。1,2,3-硫代氮化物的生成发生在扶手椅(4,4)和(5,5)单壁碳纳米管等小管径纳米管的凸面。就C2vS3的反应方式而言,1,3-偶极加成反应优于[2+2]环加成反应和络合反应。
Nanotubes are a class of host cavities increasingly used to encapsulate unstable molecules, yet none have been exploited to host reactive sulfur species, such as thiozone (S3). In this paper, density functional theory and (ONIOM) calculations were used to compute single-walled carbon nanotube (SWNT)–thiozone combinations for the inclusion of S3 into the hollow nanotube space and to rationalize when 1,2,3-thiozonide formation can take place. Nanotube diameter selectivity for the isomerization of the C2v form of S3 to the D3h form proved to be elusive. Acyclic C2v S3 was ~6 kcal/mol more stable than cyclic D3h S3 whether it was free or encapsulated within an SWNT. 1,2,3-Thiozonide formation took place on the convex side of nanotubes of low tube radii, such as the armchair (4,4) and (5,5) SWNTs. In terms of the reaction mode of C2v S3, the 1,3-dipolar addition reaction was preferred compared with the [2 + 2] cycloaddition and chelotrope paths.
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