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].
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