title: Self-assembly of 3,6-bis(4-triazolyl)pyridazine ligands with copper(I) and silver(I) ions: time-dependant 2D-NOESY and ultracentrifuge measurements.
abstract: Two 3,6-bis(R-1H-1,2,3-triazol-4-yl)pyridazines (R = mesityl, monodisperse (CH(2)-CH(2)O)(12)CH(3)) were synthesized by the copper(I)-catalyzed azide-alkyne cycloaddition and self-assembled with tetrakis(acetonitrile)copper(I) hexafluorophosphate and silver(I) hexafluoroantimonate in dichloromethane. The obtained copper(I) complexes were characterized in detail by time-dependent 1D [(1)H, (13)C] and 2D [(1)H-NOESY] NMR spectroscopy, elemental analysis, high-resolution ESI-TOF mass spectrometry, and analytical ultracentrifugation. The latter characterization methods, as well as the comparison to analog 3,6-di(2-pyridyl)pyridazine (dppn) systems and their corresponding copper(I) and silver(I) complexes indicated that the herein described 3,6-bis(1H-1,2,3-triazol-4-yl)pyridazine ligands form [2×2] supramolecular grids. However, in the case of the 3,6-bis(1-mesityl-1H-1,2,3-triazol-4-yl)pyridazine ligand, the resultant red-colored copper(I) complex turned out to be metastable in an acetone solution. This behavior in solution was studied by NMR spectroscopy, and it led to the conclusion that the copper(I) complex transforms irreversibly into at least one different metal complex species.
authors.affiliation: Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Humboldtstr. 10, 07743 Jena, Germany.
authors.forename: Bobby
authors.initials: B
authors.lastname: Happ
authors.forename: Georges M
authors.initials: GM
authors.lastname: Pavlov
authors.forename: Esra
authors.initials: E
authors.lastname: Altuntas
authors.forename: Christian
authors.initials: C
authors.lastname: Friebe
authors.forename: Martin D
authors.initials: MD
authors.lastname: Hager
authors.forename: Andreas
authors.initials: A
authors.lastname: Winter
authors.forename: Helmar
authors.initials: H
authors.lastname: Görls
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Günther
authors.forename: Ulrich S
authors.initials: US
authors.lastname: Schubert