Syntheses and solid state structures of cyclic diynes with two chalcogen centres--a competition between weak interactions |
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Authors: | Schulte J Hilko Werz Daniel B Rominger Frank Gleiter Roll |
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Affiliation: | Organisch-Chemisches Institut der Universit?t Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany. |
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Abstract: | In this paper we report the synthesis of cyclic diynes of the general formula mX2n. The letters m and n indicate the lengths of chains between two C triple bond C-X units where X indicates S, Se, or Te. The lengths of the bridges vary between m=4-8 and n=2-6. Structural investigations by means of X-ray diffraction reveal for most systems a chair-like conformation in the solid state. For 5S(2)2, 5S(2)3, 7S(2)5, 5Se(2)2 and 5Te(2)3 tubular structures were encountered. These structures can be traced back to weak XX or weak C-Hpi interactions. |
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