Hexaaqua­cobalt(II) 2,2′-[naphthalene-1,8-diylbis(­oxy)]diacetate dihydrate

Shi, H.F.; Wu, T.; Jiang, P.G.; Hao, Z.; Zhang, M.M.

doi:10.1107/S1600536813000512

Volume 69
Part 2
Pages m103-m104
February 2013

Received 19 December 2012
Accepted 7 January 2013
Online 12 January 2013

Key indicators
Single-crystal X-ray study
T = 293 K
Mean (C-C) = 0.003 Å
R = 0.031
wR = 0.080
Data-to-parameter ratio = 10.4
Details

Hexaaquacobalt(II) 2,2'-[naphthalene-1,8-diylbis(oxy)]diacetate dihydrate

Hui Fang Shi,^a ^* Tao Wu,^a Peng Gang Jiang,^a Zhi Hao ^a and Miao Miao Zhang ^a

^aDepartment of Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, People's Republic of China
Correspondence e-mail: shishipiaoliang@126.com

In the title compound, [Co(H₂O)₆](C₁₄H₁₀O₆)·2H₂O, the 2,2'-[naphthalene-1,8-diylbis(oxy)]diacetate dianion L is not coordinated to the Co^II ion. The asymmetric unit contains half of the L dianion, half of a [Co(H₂O)₆]²⁺ cation (both molecules being completed by inversion symmetry), and one water molecule. The crystal packing features O-HO hydrogen bonding between the carboxylate groups, the aqua ligands and the hydrate water molecules.

Related literature

In recent years, metal complexes have been synthezised with potential applications in molecular sorption, electrical conductivity, catalysis, magnetism, non-linear optics and molecular sensing, see: James (2003); Murray et al. (2009); Karmakar et al. (2009); Kurmoo (2009); Bradshaw et al. (2005). The 5-carboxymethoxy-naphtalene1-yl(oxy)-acetate ligand can provide a dominant packing feature and it often controls the supramolecular assembly, see: Desiraju (2007). For Cd complexes with different co-ligands, see: Deka et al. (2011); Li et al. (2012) and for Zn complexes, see: Mondal et al. (2008).

Experimental

Crystal data

[Co(H₂O)₆](C₁₄H₁₀O₆)·2H₂O
M_r = 477.28
Triclinic, $[P \overline 1]$
a = 6.377 (2) Å
b = 6.642 (2) Å
c = 12.979 (5) Å
= 79.669 (10)°
= 79.963 (11)°
= 64.911 (8)°
V = 486.8 (3) Å³
Z = 1
Mo K radiation
= 0.95 mm^-1
T = 293 K
0.30 × 0.28 × 0.25 mm

Data collection

Siemens CCD area-detector diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 2007) T_min = 0.731, T_max = 1.000
3126 measured reflections
1678 independent reflections
1605 reflections with I > 2(I)
R_int = 0.018

Refinement

R[F² > 2(F²)] = 0.031
wR(F²) = 0.080
S = 1.09
1678 reflections
161 parameters
12 restraints
H atoms treated by a mixture of independent and constrained refinement
_max = 0.37 e Å^-3
_min = -0.48 e Å^-3

Table 1
Selected bond lengths (Å)

Co1-O4	2.056 (2)
Co1-O5	2.0792 (17)
Co1-O6	2.093 (2)

Table 2
Hydrogen-bond geometry (Å, °)

D-HA	D-H	HA	DA	D-HA
O6-H6CO7ⁱ	0.96 (2)	1.76 (3)	2.723 (3)	174 (3)
O6-H6DO7ⁱⁱ	0.93 (2)	1.83 (3)	2.751 (3)	171 (3)
O5-H5AO2ⁱⁱⁱ	0.93 (3)	1.96 (3)	2.850 (3)	159 (2)
O5-H5BO3^iv	0.94 (3)	1.87 (2)	2.783 (3)	165 (2)
O7-H7AO3^v	0.92 (2)	1.82 (3)	2.736 (3)	171 (3)
O7-H7BO2^vi	0.93 (3)	1.89 (3)	2.780 (3)	158 (2)
Symmetry codes: (i) -x+1, -y+1, -z+1; (ii) x, y-1, z-1; (iii) x-1, y, z; (iv) x-1, y-1, z; (v) -x+2, -y+2, -z+1; (vi) -x+1, -y+2, -z+1.

Data collection: SMART (Siemens, 1996); cell refinement: SAINT (Siemens, 1996); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: VM2185 ).

Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities (No. CQDXWL-2012-024).

References

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Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Siemens (1996). SMART and SAINT. Siemens Analytical X-ray Instruments Inc., Madison, Wisconsin, USA.

metal-organic compounds