title: Metallomacrocycles from ditopic chiral scorpionate ligands.
abstract: Rare examples of heteroditopic scorpionate ligands [m-(pz(HO)BtBu)(pz2BtBu)C6H4]2- ([m]2-) and [p-(pz(HO)BtBu)(pz2BtBu)C6H4]2- ([p]2-) are reported. As a unique feature, both ligands possess a chiral boron centre. Treatment of [m]2- and [p]2- with FeII and CoII ions, respectively, gives the dinuclear metallomacrocycles [FeII2(micro-m)2] and [CoII2(micro-p)2]. The molecular structures of the colourless complex [FeII2(micro-m)2] and the red-purple complex [CoII2(micro-p)2] have been determined by X-ray crystallography. To meet the geometric requirements of macrocycle formation, the two asymmetric boron centres have opposite absolute configurations in the case of [FeII2(micro-m)2] and the same configuration in [CoII2(micro-p)2].
authors.affiliation: Institut für Anorganische Chemie, J.W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Thorsten
authors.initials: T
authors.lastname: Morawitz
authors.forename: Susanne
authors.initials: S
authors.lastname: Bieller
authors.forename: Michael
authors.initials: M
authors.lastname: Bolte
authors.forename: Hans-Wolfram
authors.initials: HW
authors.lastname: Lerner
authors.forename: Matthias
authors.initials: M
authors.lastname: Wagner