Documentation scienceplus.abes.fr version Bêta

À propos de : Cyclic Tetraselenadiynes: Rigid Cycles with Long-Range van derWaals Forces between Chalcogen Centers        

AttributsValeurs
type
Is Part Of
Subject
Title
  • Cyclic Tetraselenadiynes: Rigid Cycles with Long-Range van derWaals Forces between Chalcogen Centers
has manifestation of work
related by
Author
Abstract
  • The synthesis of cyclic tetraselenadiynes could be achieved by a stepwise approach. Key steps werethe reaction of the lithium salt of trimethylsilylacetylene (1) with α,ω-diselenocyanatoalkanes 2(m)(m = 2−5). By treating the bis-lithium salt of the resulting α,ω-diselenaalkadiynes 4(m) (m = 2−5)again with 2(n) (n = 2−5) the cyclic tetraselenadiynes 5(m.n) resulted, with methylene chains oflength m and n between the SeC⋮CSe units. The structures of seven ring systems could beinvestigated in the solid state. These investigations reveal that the molecular structures aredetermined by the rigid SeC⋮CSe units, which try to adopt torsion angles of the CH2−Se σ-bondsbetween 60° and 90°. In the solid state, the systems 5(3.3) and 5(5.5) show columnar structuresthat can be traced back to close contacts between Se atoms of neighboring rings.
article type
is part of this journal



Alternative Linked Data Documents: ODE     Content Formats:       RDF       ODATA       Microdata