title: Penta-aqua-tri-μ(3)-hydroxido-tris-(imino-diacetato)-μ(3)-oxido-tetra-hedro-calcium(II)tricobalt(III) 2.54-hydrate.
abstract: In the title compound, [CaCo(3)(C(4)H(5)NO(4))(3)(OH)(3)O(H(2)O)(5)]·2.54H(2)O, the Co atom is octa-hedrally coordinated by one imino-diacetate (ida) dianion as a facial O,N,O'-tridentate ligand, two μ(3)-OH groups and one μ(3)-O ligand, forming an partial Co(3)O(4) cubane cluster. This unit coordinates to a Ca(II) cation in an O,O',O''-tridentate fashion, generating a distorted CaCo(3)O(4) cubane-type cluster. The Ca-μ(3)-O distances [2.429 (5)-2.572 (6) Å] are much longer than the Co-μ(3)-O bonds [1.895 (5)-1.941 (5) Å]. The Ca(II) cation is also coord-inated by five water mol-ecules with Ca-O distances in the range 2.355 (6)-2.543 (6) Å. There are three additional uncoordinated water mol-ecules in the asymmetric unit, the occupancy of which refined to 0.54 (3). In H(2)O (or D(2)O), the title complex hydrolyses to Ca(2+) (aq) cations and [Co(3)(ida)(3)(μ(2)-OH)(3)(μ(3)-O)](2-) anions.
authors.affiliation: Department of Chemistry, Faculty of Science, Kochi University, Akebono-cho 2-5-1, Kochi 780-8520, Japan.
authors.forename: Tomoharu
authors.initials: T
authors.lastname: Ama
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Yonemura
authors.forename: Shogo
authors.initials: S
authors.lastname: Morita
authors.forename: Masanori
authors.initials: M
authors.lastname: Yamaguchi