Diaqua-tris-(nitrato-κ(2)O,O'){2,2'-[pyridine-2,6-diylbis(methyl-ene-oxy)]dibenzaldehyde-κO(1)}dysprosium(III)-2,2'-[pyridine-2,6-diylbis(methyl-ene-oxy)]dibenzaldehyde (1/1)

Abstract

The title compound, [Dy(NO(3))(3)(C(21)H(17)NO(4))(H(2)O)(2)]·C(21)H(17)NO(4), may be considered as an organic-metalorganic 1:1 co-crystal, in which the two dialdehyde mol-ecules act as a ligand and as an organic moiety, respectively. The Dy(III) atom coordinates nine O atoms from the organic ligand, bidentate nitrate ions and water mol-ecules, approximating a square-face-tricapped trigonal-prismatic geometry. The coordinated dialdehyde is not planar: the uncoordinated oxybenzaldehyde group is twisted by 39.96 (4)° from the rest of the ligand. In contrast, the free organic moiety is almost planar, with an r.m.s. deviation of 0.15 Å. In the crystal, segregated stacks of dialdehyde are formed in the [100] direction. For the complex, the shortest π-π contact is found at 3.781 (2) Å, and for the free ligand, at 3.785 (2) Å. The crystal structure is further stabilized by O-H⋯O and O-H⋯N hydrogen bonds in which coordinated water mol-ecules are the donor groups.

Fig. 1.

ORTEP-like view of the asymmetric unit, with displacement ellipsoids for non-H atoms at the 50% probability level. The inset represents the TPRS-9 polyhedron formed by coordinated O atoms. On the left, the actual coordination is represented, which compares well with the ideal D3 h polyhedron on the right, depicted in the IUPAC red book (IUPAC, 2005).

Fig. 2.

A part of the crystal structure, showing how L ligands interact in the crystal. Free L molecules (blue) form stacks separated from coordinated L molecules (green). All H atoms have been omitted for clarity.