Synthesis and Properties of Spiro-double Sila[7]helicene: The LUMO Spiro-conjugation |
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| Authors: | Nozomi Terada Keisuke Uematsu Ryota Higuchi Dr Yuki Tokimaru Yosuke Sato Dr Koji Nakano Prof Kyoko Nozaki |
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| Institution: | 1. Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656 Japan;2. Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588 Japan |
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| Abstract: | A double helicene with a spiro-Si linker ( 4 ) was synthesized by four successive nucleophilic substitutions on SiCl4. Its (P,P), (M,M) and (P,M) isomers were isolated and characterized by single crystal X-ray analysis. Due to the central spirosilabifluorene] moiety, the two helicene units in 4 are symmetrically and nearly perpendicularly arranged. (P,P)- 4 and (M,M)- 4 exhibit unique optical properties attributable to the LUMO spiro-conjugation between the two sila7]helicene units. |
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| Keywords: | chirality double helicenes helicenes siloles spiro compounds |
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