Fuzzy space periodic symmetries for polyynes and their cyano-compounds |
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Authors: | Xuezhuang Zhao Zhengfeng Shang Guichang Wang Xiufang Xu Ruifang Li Yinming Pan Zucheng Li |
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Institution: | (1) Department of Chemistry, Nankai University, Tianjin, 300071, P. R.China;(2) Center for Theoretical and Computational Chemistry, Nankai University, Tianjin, 300071, P. R.China |
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Abstract: | In our previous papers on the molecular fuzzy symmetry, we analyzed the basic characterization in connection with the fuzzy
point group symmetry. In this paper, polyynes and their cyano-derivatives are chosen as a prototype of linear molecules to
probe the one-dimensional fuzzy space group of parallel translation. It is notable that the space group is an infinite group
whereas the point group is a finite group. For the fuzzy point group, we focus on considering the fuzzy characterization introduced
due to the difference of atomic types in the monomer through point symmetry transformation in the beginning; and then we consider
the difference between the infinity of space group and the finite size of real molecules. The difference between the point
group and the space group lies in the translation symmetry transformation. This is the theme of this work. Starting with a
simple case, we will only analyze the one-dimensional translation transformation and space fuzzy inversion symmetry transformation
in this paper. The theory of the space group is often used in solid state physics; and some of its conclusions will be referred
to. More complicated fuzzy space groups will be discussed in our future papers. |
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Keywords: | fuzzy symmetry space periodic symmetry polyynes and polyyne derivatives |
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