Aquabis(5-butylpyridine-2-carboxylato)zinc monohydrate

In the title complex, [Zn(C10H12NO2)2(H2O)]·H2O, the ZnII ion is coordinated by two N and two O atoms from two 5-n-butylpyridine-2-carboxylato ligands and one O atom from a water molecule in a distorted square-pyramidal geometry. In the crystal, intermolecular O—H⋯O hydrogen bonds link molecules into a two-dimensional supramolecular structure parallel to (001).

In the title complex, [Zn(C 10 H 12 NO 2 ) 2 (H 2 O)]ÁH 2 O, the Zn II ion is coordinated by two N and two O atoms from two 5-nbutylpyridine-2-carboxylato ligands and one O atom from a water molecule in a distorted square-pyramidal geometry. In the crystal, intermolecular O-HÁ Á ÁO hydrogen bonds link molecules into a two-dimensional supramolecular structure parallel to (001).
The crystal structure of the title compound,(I), is shown in Fig. 1. The coordination sphere of the Zn II ion should be described as a distorted square-pyramidal, in which the four basal positions are occupied by two N atoms and two O atoms from two 5-n-butylpyridine-2-carboxylato ligands, and the fifth apical site is occupied by the O atom of the coordinated solvent water molecule. The Zn(II) ion is out of the plane formed by N 2 O 2 unit 0.504 (8)Å towards the Zn-O water bond.
The average Zn-N, Zn-O ligand , and the Zn-O water are 2.094, 2.043, and 2.044Å, respectively, in agreement with the corresponding distances found in other Zn complexes containing similar ligands (Qin et al., 2007;He et al., 2007). It was noting that the title complex was linked into a two-dimensional supermolecular structure under the help of the intermolecular O-H···O hydrogen bonds interactions.

Experimental
The title complex was prepared by the addition of a stiochiometric amount to zinc acetate dehydrate (0.054 mmol) to a hot aqueous solution (5 ml) of fusaric acid (30 mmol) which was extracted from the endophytic fungus phomopsis sp. from the mangrove tree on the South China Sea coast. The resulting solution was filtered, and colorless crystals were obtained by slow evaporation of a methanol-water solution (90:10 v/v) at room temperature over several days.

Refinement
All the H atoms bonded to the C atoms were placed using the HFIX commands in SHELXL-97, with C-H distances of 0.95, 0.98 and 0.99 Å, and were allowed for as riding atoms with U iso (H) = 1.2 or 1.5U eq (C). For the H atom of the water molecule, they were found from difference Fourier maps with the O-H bond length restrained to 0.85 Å. Fig. 1. The molecular structure of the title complex with the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level.