[MN3O(O2CPH)(6)(PY)(2)](2)(4,4'-BPY) AND [MN9O7(O2CC6H4-P-OME)(13)(4,4'-BPY)](2) - NEW MULTINUCLEAR MANGANESE COMPLEXES

The synthesis, X-ray crystal structures and magnetic properties of two new types of dimers of multinuclear manganese aggregates are describe d. [Mn3O(O2CPh)(6)(py)(2)](2)(4,4'-bpy) is prepared from the reaction of the trinuclear starting material [Mn3O(O2CPh)(6)(py)(2)(H2O)] with 4,4'-bipyridine. This compound can be described as a dimer of trinucle ar units and has been characterized crystallographically as part of a unit cell which also contains a monomeric, trinuclear species. Dimers of enneanuclear manganese complexes linked by two bifunctional units ( 4,4'-bipyridine or trans-1,2-bis(4-pyridylethene)) may be prepared fro m the tetranuclear starting material, ((Bu4N)-Bu-n)[Mn4O2(O2CR)(9)(H2O )], where R = Ph or C6H4-p-OMe. The new octadecanuclear complex [Mn9O7 (O2CC6H4-p-OMe)(13)(4,4'-bpy)](2) has been structurally characterized. This complex shows magnetic behavior which can be fit by considering only magnetic interactions within the individual Mn9O7 units. (C) 1997 Elsevier Science S.A.