The molecular structure of perfluoro-thiirane in the presence of perfluoro-cyclobutane: a gas-phase electron diffraction study |
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| Institution: | 1. Ministry-of-Education Key Laboratory for Green Preparation and Application of Functional Materials, School of Materials Science and Engineering, Hubei University, 430062 Wuhan, China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084 Beijing, China;1. School of art and design, Wuhan university of technology, Wuhan 430070, China;2. School of Aerospace Engineering, Xiamen University, Xiamen 361005, China;3. School of Industrial Design, Hubei University of Technology, Wuhan 430070, China;4. Jinyintan Hospital, Huazhong University of Science and Technology, Wuhan 430048, China |
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| Abstract: | The molecular structure of perfluoro-thiirane has been studied using gas-phase electron diffraction data collected on the Balzers KDG2 instrument at UMIST. As samples are unavoidaby contaminated with perfluoro-cyclobutane, it proved possible to obtain structural parameters for this molecule simultaneously. The three-membered sulphur ring has CS = 1.799(3), CC = 1.45(1) Å, with ∠CSC = 47.5(5), ∠SCC = 66.2(3)°, and the fluorine parameters are CF = 1.322(2) Å, ∠SCF = 121.5(6) and ∠CCF = 116.2(5)°, For perfluoro-cyclobutane, values of ∠CCC = 88.8(1) and ∠FCF = 110(1)° are obtained, the fold-angle expressing the non-planarity of the ring being 23(1)°, when refined the CC distance converged to 1.58(1) Å. These results compare favourably with those obtained previously for perfluoro-cyclobutane. The percentages of the latter present in the samples studied at the 100 and 50 cm camera distances averaged about 25%, whereas around 40% was present in experiments at the 25 cm distance, which require longer exposure times. |
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