title: A world beyond hydrogen bonds? -Chalcogen-chalcogen interactions yielding tubular structures.
abstract: It is shown that tubular structures arise in the solid state through close chalcogen-chalcogen (X...X) contacts. As examples a variety of cyclic systems containing sulfur and selenium centers is presented. Common to all of them are close contacts between the chalcogen centers of neighboring stacks giving rise to a zigzag or ladder-type arrangement. In the case of cyclic systems of ring size 24-33 the resulting tubes are able to include hydrocarbons as guest molecules. For 2,7-ditelluraocta-3,5-diyne (17) the close contacts between the tellurium centers of the acyclic C(2) symmetric building blocks generate a helical arrangement in which n-hexane was included. The favored X...X contacts can be traced back to np(X)-sigma*(X[bond]C) interactions.
authors.affiliation: Organisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany. rolf.gleiter@urz.uni-heidelberg.de
authors.forename: Rolf
authors.initials: R
authors.lastname: Gleiter
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Werz
authors.forename: Bernhard J
authors.initials: BJ
authors.lastname: Rausch
mesh_terms: D040761:Biomimetic Materials / Q000737:chemistry; D018011:Chalcogens / Q000737:chemistry*; D004151:Dipeptides / Q000737:chemistry; D006860:Hydrogen Bonding; D010456:Peptides, Cyclic / Q000737:chemistry
chemical_list: D018011:Chalcogens; D004151:Dipeptides; D010456:Peptides, Cyclic