Acta Cryst. (2009). C65, m411-m414 [ doi:10.1107/S0108270109037512 ]
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-but-2-enoato-bis[diaqua(but-2-enoato)Ln]-2,6-diaminopurine (1/2) (Ln = Dy and Ho)Abstract: The title isomorphous compounds, tetra--but-2-enoato-bis[diaqua(but-2-enoato)dysprosium(III)]-2,6-diaminopurine (1/2), [Dy2(C4H5O2)6(H2O)4]·2C5H6N6, and tetra--but-2-enoato-bis[diaqua(but-2-enoato)holmium(III)]-2,6-diaminopurine (1/2), [Ho2(C4H5O2)6(H2O)4]·2C5H6N6, consist of [Ln(crot)3(H2O)2]2 dimers (crot is crotonate or but-2-enoate; Ln is the lanthanide cation), built up around inversion centres and completed by 2,6-diaminopurine molecules. The lanthanide cation is coordinated by three chelating crotonate units and two water molecules. One of the chelating carboxylate groups acts also in a bridging mode sharing one O atom with both cations and the final result is a pair of DyO9 tricapped prismatic polyhedra linked to each other through a central (Dy-O)2 loop. A feature of the structures is the existence of a complex intermolecular interaction scheme involving two sets of tightly interlinked non-intersecting one-dimensional structures, one of them formed by the [Dy(crot)3(H2O)2]2 dimers (running along [100] and linked by O-H
O hydrogen bonds) and the second formed by 2,6-diaminopurine molecules (evolving along [010] linked by N-HN hydrogen bonds).
Formula: [Dy2(C4H5O2)6(H2O)4]·2C5H6N6 and [Ho2(C4H5O2)6(H2O)4]·2C5H6N6
 |   Structure factor file (CIF format) (233.6 kbytes) |
| Structure factor file (CIF format) (230.4 kbytes) |
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