Surface modification by substitution: Changing topology of conformational potential energy surfaces |
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| Affiliation: | 1. State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;2. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;1. Materials Synthesis and Processing Lab, School of Fashion and Textiles, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong Special Administrative Region of China;2. Research Centre for Resources Engineering towards Carbon Neutrality, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong Special Administrative Region of China;3. Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong Special Administrative Region of China;4. College of Materials Science and Engineering, Chongqing University, Shazhengjie 174, Shapingba, Chongqing, 400030, China;1. Water Pollution Research Department, National Research Centre, 33El-Bohouth St. (Former El-Tahrir St.), Dokki, P.O. 12622, Giza, Egypt;2. Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt;3. Faculty of Nanotechnology for Postgraduate Studies, Cairo University, Sheikh Zayed Campus, 6th October City, Giza 12588, Egypt;4. Physics Department, Faculty of Science, Cairo University, Giza 12613, Egypt;1. Department of Chemistry and Biochemistry, Ohio University, 100 University Terrace, 136 Clippinger Laboratories, Athens, OH 45701, United States;2. Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, United States;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Dingxi 1295, Changning, Shanghai 200050, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. National Institute of Advanced Industrial Science and Technology (AIST), Moriyama, Nagoya 463-8560, Japan |
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| Abstract: | It is shown for compounds XS-CHCH-CHO that chemical substitution (X = H → F and X = H → Li) results in the change of conformational potential energy surfaces not only in the quantitative but in the qualitative sense as well. Qualitative change always implied a modified surface topology, i.e. critical points are either created by “split-ups” or annihilated by “collapse”. It appears that some kind of “selection rule” might be operative in the “creation” and “annihilation” of critical points during the change of surface topology as the result of chemical substitution. |
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