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Acta Cryst. (2012). E68, m31-m32  [ doi:10.1107/S1600536811052445 ]

2,9-Dimethyl-1,10-phenanthrolin-1-ium (6-carboxy-4-hydroxypyridine-2-carboxylato-[kappa]3O2,N,O6)(4-hydroxypyridine-2,6-dicarboxylato-[kappa]3O2,N,O6)zincate(II) 2.35-hydrate: a proton-transfer compound

Z. Derikvand, H. Stoeckli-Evans and A. Nemati

Abstract: In the title compound, (C14H13N2)[Zn(C7H3NO5)(C7H4NO5)]·2.35H2O, the ZnII atom is coordinated by two N atoms and four O atoms from the carboxylate groups of the 4-hydroxypyridine-2,6-dicarboxylate and 6-carboxy-4-hydroxypyridine-2-carboxylate ligands, forming a distored octahedral geometry. In the anion, the two pyridine rings are inclined to one another by 87.75 (13)°. Two types of robust O-H...O hydrogen bond synthons, viz. R22(16) and R66(42), link the anions to form a two-dimensional network parallel to the bc plane. Furthermore, O-H...O, N-H...O, N-H...N and weak C-H...O hydrogen bonds connect the two dimensional networks, forming a three-dimensional structure. In the crystal, there are also C-H...[pi] and [pi]-[pi] interactions [centroid-centroid distances of 3.5554 (18) and 3.7681 (18) Å], and C=O...[pi] interactions [O...centroid distance = 3.117 (2) Å] present. One of the three crystal water molecules shows an occupancy of 0.35.

Online 10 December 2011


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