catena-Poly[[(acetato-ê2O,O
)triaquabarium(II)]-µ3-acetato-

ELEONORA FREIRE; RICARDO BAGGIO

ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS

WILEY-BLACKWELL PUBLISHING, INC

Año: 2008 vol. C64 p. 164 - 166

0108-2701

The present form of barium acetate, formulated as [Ba-(C2H3O2)2(H2O)3]n, is the largest reported hydrate of the saltand this leads to a distinct structural behaviour setting it apartfrom the rest of the family. The compound is a linear polymer with a nine-coordinate Ba(Oaqua)3(Oacetate)6 monomer unit. The non-H part of the structure is ordered according to C2/m symmetry, while the disordered water H atoms only abide by this symmetry in a statistical sense. Each molecule is halved by a mirror plane bisecting the Ba centre, one water molecule andone acetate ligand, while containing the other acetate ligand. The chains are interconnected by a disordered water–water/acetate O—H...O hydrogen-bonding network involving all water H atoms. The structure and stability of this phase arecompared with the other known acetates of barium which differ in the degree of hydration.