期刊
CHEMICAL PHYSICS LETTERS
卷 471, 期 1-3, 页码 111-115出版社
ELSEVIER
DOI: 10.1016/j.cplett.2009.02.019
关键词
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资金
- Fund for Scientific Research
- Communaute franaise Wallonie-Bruxelles
- Bulgarian Academy of Sciences
- Loterie Nationale [2.4578.02]
- FUNDP
The polarizability and second hyperpolarizability of polysilole chains containing 2-9 silole units have been calculated ab initio. The MP2/6-31G* longitudinal polarizability per silole unit converges towards 324 au, which is at least of semi-quantitative accuracy because basis set and electron correlation effects compensate each other. On the other hand, the second hyperpolarizability per silole unit does not show any sign of leveling off, demonstrating substantial electron delocalization effects associated with a small bond length alternation. These second hyperpolarizabilities are amongst the largest values reported so far, though they remain a factor of 2-3 smaller than in polybutatriene. (C) 2009 Elsevier B.V. All rights reserved.
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