title: Efficient Self-Assembly of Di-, Tri-, Tetra-, and Hexavalent Hosts with Predefined Geometries for the Investigation of Multivalency.
abstract: Coordination-driven self-assembly of differently shaped di- to hexavalent crown-ether host molecules is described. A series of [21]crown-7- and [24]crown-8-substituted bipyridine and terpyridine ligands was synthetized in a "toolbox" approach. Subsequent coordination to 3d transition metal and ruthenium(II) ions provides an easy and fast access to host assemblies with variable valency and pre-defined orientations of the crown-ether moieties. Preliminary isothermal calorimetry (ITC) titrations provided promising results, which indicated the host complexes under study to be suitable for the future investigation of multivalent and cooperative binding. The hosts described herein will also be suitable for the construction of various multiply threaded mechanically interlocked molecules.
authors.affiliation: Institut für Chemie und Biochemie der Freien Universität Berlin, Takustrasse 3, 14195 Berlin (Germany).
authors.forename: Igor
authors.initials: I
authors.lastname: Linder
authors.affiliation: Institut für Chemie und Biochemie der Freien Universität Berlin, Takustrasse 3, 14195 Berlin (Germany).
authors.forename: Stefan
authors.initials: S
authors.lastname: Leisering
authors.affiliation: University of Jyvaskyla, Department of Chemistry, Nanoscience Center, P.O. Box. 35, 40014 University of Jyvaskyla (Finland).
authors.forename: Rakesh
authors.initials: R
authors.lastname: Puttreddy
authors.affiliation: Institut für Chemie und Biochemie der Freien Universität Berlin, Takustrasse 3, 14195 Berlin (Germany).
authors.forename: Nadine
authors.initials: N
authors.lastname: Rades
authors.affiliation: University of Jyvaskyla, Department of Chemistry, Nanoscience Center, P.O. Box. 35, 40014 University of Jyvaskyla (Finland).
authors.forename: Kari
authors.initials: K
authors.lastname: Rissanen
authors.affiliation: Institut für Chemie und Biochemie der Freien Universität Berlin, Takustrasse 3, 14195 Berlin (Germany). c.schalley@fu-berlin.de.
authors.forename: Christoph A
authors.initials: CA
authors.lastname: Schalley
keywords: coordination chemistry; crown ethers; multivalency; pseudorotaxanes; supramolecular chemistry