Two isomorphous crotonatolanthanide complexes: tetra‐μ‐but‐2‐enoato‐bis[diaqua(but‐2‐enoato)Ln]–2,6‐diaminopurine (1/2) (Ln = Dy and Ho) |
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| Authors: | Ana María Atria Alan Astete Maria Teresa Garland Ricardo Baggio |
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| Abstract: | The title isomorphous compounds, tetra‐μ‐but‐2‐enoato‐bisdiaqua(but‐2‐enoato)dysprosium(III)]–2,6‐diaminopurine (1/2), Dy2(C4H5O2)6(H2O)4]·2C5H6N6, and tetra‐μ‐but‐2‐enoato‐bisdiaqua(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—H...N hydrogen bonds). |
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