Bis(methanol-κO)bis(quinoline-2-carboxylato-κ2 N,O)nickel(II)

In the title complex, [Ni(C10H6NO2)2(CH3OH)2], the NiII ion lies on an inversion center and is coordinated by two quinoline-2-carboxylate ligands in the equatorial sites and two axial methanol ligands, forming a distorted octahedral environment. In the crystal, molecules are linked via O—H⋯O hydrogen bonds into a two-dimensional network parallel to (10).

In the title complex, [Ni(C 10 H 6 NO 2 ) 2 (CH 3 OH) 2 ], the Ni II ion lies on an inversion center and is coordinated by two quinoline-2-carboxylate ligands in the equatorial sites and two axial methanol ligands, forming a distorted octahedral environment. In the crystal, molecules are linked via O-HÁ Á ÁO hydrogen bonds into a two-dimensional network parallel to (101).
Financial support from the Forest Science & Technology Projects (S121011L080120) and the Cooperative Research Program for Agricultural Science & Technology Developments (20070301-036-019-02) is gratefully acknowledged.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH5343).
In the crystal structure of the title compound, [Ni(C 10 H 6 NO 2 ) 2 (CH 3 OH) 2 ], the Ni II ion occupies a crystallographic inversion center. Two quinoline-2-carboxylate ligands coordinate the Ni II ion in the equatorial sites and two methanol ligands coordinate the Ni II ion in axial sites to form a distorted octahedral environment (Fig. 1). In the crystal, molecules are linked via O-H···O hydrogen bonds to form a two-dimensional network parallel to [1 0 -1].

Experimental
Quinaldic acid (17.7 mg, 0.1 mmol) and NH 4 OH (13.9 ml, 0.1 mmol) were dissolved in 4 ml methanol and carefully layered with 4 ml methanol solution of nickel(II) chloride hexahydrate (11.9 mg, 0.05 mmol). Suitable crystals of the title compound for X-ray analysis were obtained in two weeks.

Refinement
H atoms bonded to C atoms were placed in calculated positions with C-H distances of 0.93-0.96Å. They were included in the refinement in a riding-motion approximation with U iso (H)= 1.2U eq (C) or U iso (H) = 1.5U eq (C methyl ). The positions of O-H atoms of the methanol ligands were refined with O-H restraints (0.86 Å) and U iso (H)= 1.2U eq (O). Fig. 1. The molecular structure of the title compound with displacement ellipsoids shown at the 30% probability level. Unlabeled atoms are related by the symmetry operator (-x+2, -y, -z+1).