title: Supramolecular structures from mono and dimetalated biscarbene ligands.
abstract: A series of benzobisimidazolium salts 1a-d has been prepared by tetraalkylation of benzobisimidazol. The salts 1a-d react with two equivalents of [Pt(Cl)2dppe] in the presence of 2.2 equivalents of sodium acetate to yield the dinuclear biscarbene complexes 2a-d. Under the same reaction conditions, the benzobisimidazolium salts react with only one equivalent of [Pt(Cl)2dppe] and one equivalent of sodium acetate to yield the monometalated carbene/benzimidazolium derivatives 3a,3c. Benzobisimidazolium salt 1c reacts with two equivalents of nickelocene to give the biscarbene bridged dinuclear nickel complex 4. Treatment of 4 with two equivalents of 4,4-bipyridine leads to the formation of the CpNiII-cornered molecular rectangle 5.
authors.affiliation: Institut für Anorganische und Analytische, Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Radloff
authors.forename: F Ekkehardt
authors.initials: FE
authors.lastname: Hahn
authors.forename: Tania
authors.initials: T
authors.lastname: Pape
authors.forename: Roland
authors.initials: R
authors.lastname: Fröhlich