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

2,9-Dimethyl-1,10-phenanthrolin-1-ium (6-carboxy-4-hydroxypyridine-2-carboxylato-³O²,N,O⁶)(4-hydroxypyridine-2,6-dicarboxylato-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 Zn^II 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-HO 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-HO, N-HO, N-HN and weak C-HO hydrogen bonds connect the two dimensional networks, forming a three-dimensional structure. In the crystal, there are also C-H and - interactions [centroid-centroid distances of 3.5554 (18) and 3.7681 (18) Å], and C=O interactions [Ocentroid 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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