Diaqua­bis­(1-methyl-1H-imidazole-κN 3)bis­[2-(naphthalen-1-yl)acetato-κO]cobalt(II)

Hong Zhao; Fu-Jun Yin; Xing-You Xu; Li-Jun Han

doi:10.1107/S1600536812013505

. 2012 Apr 4;68(Pt 5):m533. doi: 10.1107/S1600536812013505

Diaquabis(1-methyl-1H-imidazole-κN ³)bis[2-(naphthalen-1-yl)acetato-κO]cobalt(II)

Hong Zhao ^a, Fu-Jun Yin ^b,^*, Xing-You Xu ^c, Li-Jun Han ^d

PMCID: PMC3344294 PMID: 22590060

Abstract

In the title compound, [Co(C₁₂H₉O₂)₂(C₄H₆N₂)₂(H₂O)₂], the Co^II ion is located on an inversion centre and displays a distorted octahedral coordination geometry. Two O atoms from two water molecules and two carboxylate O atoms from two 2-(naphthalen-1-yl)acetate ligands are in the equatorial plane and two N atoms from two 1-methyl-1H-imidazole ligands are in the axial positions. The structure is stabilized by intramolecular O—H⋯O hydrogen bonds. Intermolecular O—H⋯O hydrogen bonds link the complex molecules into chains along [100].

Related literature

For the structures of related complexes with 2-(naphthalen-1-yl)acetate ligands, see: Duan et al. (2007 ▶); Ji et al. (2011 ▶); Tang et al. (2006 ▶); Yang et al. (2008 ▶); Yin et al. (2011 ▶).

Experimental

Crystal data

[Co(C₁₂H₉O₂)₂(C₄H₆N₂)₂(H₂O)₂]
M _r = 629.56
Monoclinic,
a = 7.3384 (7) Å
b = 24.582 (2) Å
c = 8.8559 (8) Å
β = 111.158 (1)°
V = 1489.8 (2) Å³
Z = 2
Mo Kα radiation
μ = 0.63 mm⁻¹
T = 298 K
0.34 × 0.30 × 0.20 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ▶) T _min = 0.815, T _max = 0.885
13335 measured reflections
3356 independent reflections
2865 reflections with I > 2σ(I)
R _int = 0.024

Refinement

R[F ² > 2σ(F ²)] = 0.032
wR(F ²) = 0.084
S = 1.05
3356 reflections
203 parameters
2 restraints
H atoms treated by a mixture of independent and constrained refinement
Δρ_max = 0.25 e Å⁻³
Δρ_min = −0.28 e Å⁻³

Data collection: APEX2 (Bruker, 2007 ▶); cell refinement: SAINT (Bruker, 2007 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: DIAMOND (Brandenburg, 1999 ▶); software used to prepare material for publication: SHELXTL (Sheldrick, 2008 ▶).

Supplementary Material

Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536812013505/hy2522sup1.cif

e-68-0m533-sup1.cif^{(19.5KB, cif)}

Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536812013505/hy2522Isup2.hkl

e-68-0m533-Isup2.hkl^{(161.3KB, hkl)}

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Table 1. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H3A⋯O2ⁱ	0.84 (2)	2.13 (2)	2.8523 (18)	144 (2)
O3—H3B⋯O2	0.85 (2)	1.81 (2)	2.6463 (16)	168 (2)

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Symmetry code: (i) Inline graphic .

Acknowledgments

The authors thank Jiangsu Marine Resources Development Research Institute and Huaihai Institute of Technology for support of this work.

supplementary crystallographic information

Comment

In recent years 2-(naphthalen-1-yl)acetate ligand has attracted many interests in coordination chemistry due to its ability to form metal complexes (Duan et al., 2007; Ji et al., 2011; Tang et al., 2006; Yang et al., 2008; Yin et al., 2011). The crystal structure of the title compound was determined as part of an ongoing study of the properties of cobalt complexes containing imidazole ligands.

In the title compound (Fig. 1), the Co^II ion is located on an inversion centre and displays a distorted octahedral coordination geometry. Two O atoms from two water molecules and two carboxylate O atoms from two 2-(naphthalen-1-yl)acetate ligands are in the equatorial plane and two N atoms from two N-methylimidazole ligands are in the axial positions. The structure is stabilized by intramolecular O—H···O hydrogen bonds (Table 1). In the crystal, intermolecular O—H···O hydrogen bonds link the complex molecules into chains along [100] (Fig. 2).

Experimental

The title compound was synthesized by the reaction of CoCl₂.6H₂O (71.3 mg, 0.3 mmol), 2-(naphthalen-1-yl)acetic acid (93 mg, 0.5 mmol), N-methylimidazole (32.8 mg, 0.4 mmol) and NaOH (20 mg, 0.5 mmol) in 15 ml of a water-ethanol mixture (v/v 1:1) under solvothermal conditions. The starting mixture was homogenized and transferred into a sealed Teflon-lined bomb (25 ml) and heated at 140° C for three days. After cooling, red crystals of the title compound were obtained, which were washed with distilled water and absolute ethyl alcohol (yield: 26.8% based on Co).