A silver bite: crystalline heterometallic architectures based on Ag-π interactions with a bis-dipyrrin zinc helicate.
An unprecedented mode of assembly of helical motives and Ag(I)  ions in the crystalline state is described. The combination of a Zn(II) helicate based on a 2,2'-bisdpm bearing peripheral benzonitrile moieties with AgX salts, leads to the formation of a tetranuclear core containing Ag-π interactions. Depending on the coordinating ability of the X(-) anion and the solvents used, the tetranuclear complex self-assembles into coordination polymers of varying dimensionality. From the sequence of coordination events (Ag-π or Ag-peripheral site), one may envisage two possible construction scenarios. However, the Ag-π as primary event seems reasonable owing to the rather weak binding propensity of the nitrile group and the chelating nature of the π-clefts.
Laboratoire de Tectonique Moléculaire, UMR UdS-CNRS 7140 icFRC, Institut Le Bel, Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081 Strasbourg cedex (France), Fax: (+33) 3-68-85-13-25.
Hervé
H
Ruffin
Stéphane A
SA
Baudron
Domingo
D
Salazar-Mendoza
Mir Wais
MW
Hosseini
Ag-π interactions; helicates; molecular tectonics; self-assembly; silver