Acta Cryst. (2008). E64, m350-m351  [ doi:10.1107/S1600536807068328 ]

Tris(piperazinediium) bis[tris(pyridine-2,6-dicarboxylato)neodymate(III)] 15.33-hydrate

Z. Derikvand, H. Aghabozorg, A. Nemati, M. Ghadermazi and J. Attar Gharamaleki

Abstract: The title compound, (C₄H₁₂N₂)₃[Nd(C₇H₃NO₄)₃]₂·15.33H₂O or (pipzH₂)₃[Nd(pydc)₃]₂·15.33H₂O (in which pipz is piperazine and pydcH₂ is pyridine-2,6-dicarboxylic acid), was synthesized by the reaction of NdCl₃·6H₂O with the proton-transfer compound (pipzH₂)(pydc) in aqueous solution. The nine donor atoms of the three pydc^2- ligands form a distorted tricapped trigonal-prismatic arrangement around the Nd^III center. Considerable C-O stacking interactions between CO groups of carboxylate fragments and aromatic rings of pydc^2- with distances of 3.135 (5)-3.255 (5) Å are observed. In the crystal structure, a wide range of hydrogen-bonding [of the types O-HO, N-HO and C-HO, with DA distances ranging from 2.608 (10) to 3.278 (7) Å], ion-pairing and C-O stacking interactions connect the various components into a supramolecular structure. There is a high degree of solvent disorder in the structure; the occupancies of five water molecules refined to 0.6, 0.5, 0.4, 0.25 and 0.25.

Online 16 January 2008

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