Bis(benzimidazole) as supramolecular building block in manganese(IV) chemistry

Add time:08/17/2019    Source:sciencedirect.com

Four new manganese(IV) complexes with cyclic form of the tripodal oxime ligand tris(2-hydroxyiminopropyl)amine (Ox3H3, L1) and bis(benzimidazole) (Bbim) auxiliary ligand were prepared and characterized in terms of their crystal structures [(L1′Mn (Bbim)CH3OH)3MnO] (1), [L1′Mn(Bbim)H2O]·2CH3OH (2), ([L1′Mn(Bbim)CH3OH]·CH3OH ∙ 1/2 Bbim (3) and [(L1′MnCH3OH)2(Bbim)] ∙ 2 CH3OH (4)). During the synthesis procedure of all complexes intramolecular cyclization of Ox3H3 occurs and adamantane-like ligand is obtained. This ligand coordinates with three oxygen donor atoms to the Mn atoms in the formed metal complexes. The Bbim ligand plays a variable role: in compounds 1 and 4 it acts as a bridging ligand and thus promotes the formation of tetranuclear complexes in 1 and of dimers in 4. 2 and 3 are similar Mn(IV) complexes where one molecule of Bbim is bonded to each manganese ion. In 1–4 the Bbim ligand coordinates to the Mn atoms through at least two N atoms from two independent imidazole units, thus can be regarded as a robust building block enabling formation of higher-nuclearities complexes and possibly, based on comparison with the available literature, as a supramolecular synthon.

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