Journal
INORGANICA CHIMICA ACTA
Volume 297, Issue 1-2, Pages 6-10Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0020-1693(99)00252-2
Keywords
crystal structures; manganese complexes; iron complexes; oxo complexes; tetrahedral complexes; isomerism
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The structures of two new complexes of the anion of 2,2'-dipyridylamine (dpa) with the tetrahedral [M4O](6+) core (M = Mn, Fe) are presented. The structures are a variation of the basic beryllium acetate structure, in which a central [M-4(mu(4)-O)](6+) unit has each of the six edges of the tetrahedron bridged by a bidentate ligand. The situation is complicated in the present case by the potentially tridentate dpa ligand, such that the third nitrogen atom coordinates to a metal atom in only three of the six ligands, forming complexes in which one metal atom is four-coordinate and three are five-coordinate. Analysis of the three-dimensional structures of the resulting Mn and Fe complexes reveals a surprising form of isomerism. (C) 2000 Elsevier Science S.A. All rights reserved.
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