Diaqua­bis­(5-carb­oxy-2-propyl-1H-imidazole-4-carboxyl­ato-κ2N3,O4)zinc(II) 3.5-hydrate

Li, S.-J.; Song, W.-D.; Li, S.-H.; Dong, J.-J.; Yan, J.-B.

doi:10.1107/S1600536810031478

metal-organic compounds

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ISSN: 2056-9890

Volume 66| Part 9| September 2010| Pages m1094-m1095

https://doi.org/10.1107/S1600536810031478

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Diaquabis(5-carboxy-2-propyl-1H-imidazole-4-carboxylato-κ²N³,O⁴)zinc(II) 3.5-hydrate

Shi-Jie Li,^a Wen-Dong Song,^b ^* Shi-Hong Li,^c Jing-Jing Dong ^a and Jian-Bin Yan ^a

^aCollege of Food Science and Technology, Guang Dong Ocean University, Zhanjiang 524088, People's Republic of China, ^bCollege of Science, Guang Dong Ocean University, Zhanjiang 524088, People's Republic of China, and ^cCollege of Medical Laboratory, Hebei North University, Zhangjiakou 075000, People's Republic of China
^*Correspondence e-mail: songwd60@163.com

(Received 19 July 2010; accepted 5 August 2010; online 18 August 2010)

In the title complex, [Zn(C₈H₉N₂O₄)₂(H₂O)₂]·3.5H₂O, the Zn^II ion is coordinated by two N,O-bidentate H₂pimda ligands (H₃pimda = 2-propyl-1H-imidazole-4,5-dicarboxylic acid) and two water molecules in a distorted octahedral environment. In the crystal structure, extensive intermolecular O—H⋯O and N—H⋯O hydrogen bonds stabilize the three-dimensional supramolecular network. Intramolecular O—H⋯O hydrogen bonds between the carboxyl groups are also observed. The propyl groups of the two H₂pimda ligands are disordered each over two sites, with occupancy factors of 0.752 (5):0.248 (5) and 0.519 (7):0.481 (7). One of the water molecules is half-occupied.

Related literature

For the potential uses and diverse structural types of metal complexes with imidazole-4,5-dicarboxylic acid, see: Li et al. (2006 ); Zou et al. (2006 ). For our previous structural studies of complexes derived from 2-propyl-1H-imidazole-4,5-dicarboxylic acid, see: Fan et al. (2010 ); He et al. (2010 ); Li et al. (2010 ); Song et al. (2010 ); Yan et al. (2010 ).

Experimental

Crystal data

[Zn(C₈H₉N₂O₄)₂(H₂O)₂]·3.5H₂O
M_r = 558.82
Triclinic, $[P \overline 1]$
a = 10.4780 (18) Å
b = 10.5729 (18) Å
c = 11.3012 (19) Å
α = 81.783 (2)°
β = 83.035 (2)°
γ = 86.852 (2)°
V = 1229.1 (4) Å³
Z = 2
Mo Kα radiation
μ = 1.07 mm⁻¹
T = 296 K
0.29 × 0.24 × 0.21 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2001 ) T_min = 0.747, T_max = 0.806
6393 measured reflections
4360 independent reflections
3172 reflections with I > 2σ(I)
R_int = 0.033

Refinement

R[F² > 2σ(F²)] = 0.056
wR(F²) = 0.160
S = 1.07
4360 reflections
342 parameters
24 restraints
H-atom parameters constrained
Δρ_max = 0.81 e Å⁻³
Δρ_min = −0.72 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯O4	0.82	1.68	2.502 (6)	180
O7—H7⋯O6	0.82	1.63	2.445 (6)	176
N2—H2⋯O4W	0.86	1.88	2.737 (6)	171
N4—H4⋯O6W	0.86	2.03	2.863 (6)	162
O1W—H1W⋯O5Wⁱ	0.84	1.86	2.675 (6)	164
O1W—H2W⋯O8ⁱⁱ	0.84	1.89	2.720 (5)	170
O2W—H3W⋯O8ⁱⁱⁱ	0.83	2.13	2.910 (6)	155
O2W—H4W⋯O2^iv	0.83	2.00	2.802 (6)	161
O3W—H5W⋯O3^iv	0.84	1.98	2.795 (8)	162
O3W—H6W⋯O3^v	0.84	1.92	2.743 (8)	165
O4W—H7W⋯O3W	0.84	1.81	2.633 (9)	163
O4W—H8W⋯O7^vi	0.84	2.16	2.877 (6)	143
O5W—H9W⋯O5^vi	0.85	2.14	2.865 (6)	144
O5W—H10W⋯O4^vii	0.85	1.98	2.812 (6)	169
O6W—H11W⋯O3W^vii	0.84	1.74	2.574 (10)	174
O6W—H12W⋯O5W^viii	0.84	2.27	2.789 (7)	120
Symmetry codes: (i) x+1, y, z-1; (ii) -x+1, -y+1, -z; (iii) x+1, y, z; (iv) -x+2, -y, -z+1; (v) x, y, z+1; (vi) -x+1, -y+1, -z+1; (vii) -x+1, -y, -z+1; (viii) x, y, z-1.

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: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.

Supporting information

Crystal structure: contains datablocks I, 1R. DOI: https://doi.org/10.1107/S1600536810031478/hy2336sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810031478/hy2336Isup2.hkl

checkCIF report

Comment top

Recently, our research group has shown great interest in the solid-state coordination chemistry of N-heterocyclic carboxylic acids, such as 2-propyl-1H-imidazole-4,5-dicarboxylic acid (H₃pimda) ligand as a derivative of imidazole-4,5-dicarboxylic acid (H₃idc). The efficient N,O-donors have been used to obtain new metal-organic complexes by our research group, such as poly[diaquabis(5-carboxy-2-propyl-1H-imidazole-4-carboxylato-κ³ N³,O⁴,O⁵)calcium(II)] (Song et al., 2010), [diaquabis(5-carboxy-2-propyl-1H-imidazole-4-carboxylato- κ²N³,O⁴)manganese(II)] N,N-dimethylformamide (Yan et al., 2010), [diaquabis(5-carboxy-2-propyl-1H-imidazole-4-carboxylato- κ²N³,O⁴)nickle(II)] N,N-dimethylformamide disolvate (Li et al., 2010), diaquabis(4-carboxy-2-propyl-1H-imidazole-5-carboxylato- κ²N³,O⁴)copper(II) N,N-dimethylformamide disolvate (He et al., 2010) and diaquabis(5-carboxy-2-propyl-1H-imidazole-4-carboxylato- κ²N³,O⁴)nickle(II) tetrahedrate (Fan et al., 2010). In this paper, we report the structure of a new zinc(II) complex with H₂pimda obtained under hydrothermal conditions.

As illustrated in Fig. 1, the title complex is isomorphous with its Ni(II) analogue (Fan et al., 2010). Similar structural descriptions can be applied to the present isomorphous complex. The Zn^II atom is six-coordinated by two N,O-bidentate H₂pimda ligands and two water molecules in a distorted octahedral geometry. The dihedral angle between the two imidazole rings is 77.8 (5)°. In the crystal structure, the three-dimensional supramolecular network is stabilized by extensive O—H···O and N—H···O hydrogen bonds involving the uncoordinated and coordinated water molecules, the carboxy groups and the protonated N atoms of the imidazole rings (Table 1). The propyl groups of the H₂pimda ligands are disordered each over two sites, with refined occupancies of 0.752 (5): 0.248 (5) and 0.519 (7):0.481 (7).

Related literature top

For the potential uses and diverse structural types of metal complexes with imidazole-4,5-dicarboxylic acid, see: Li et al. (2006); Zou et al. (2006). For our previous work based on 2-propyl-1H-imidazole-4,5-dicarboxylic acid, see: Fan et al. (2010); He et al. (2010); Li et al. (2010); Song et al.(2010); Yan et al. (2010).

Experimental top

A mixture of Zn(NO₃)₂ (0.5 mmol, 0.09 g) and 2-propyl-1H-imidazole-4,5-dicarboxylic acid (0.5 mmol, 0.99 g) in 15 ml of H₂O solution was sealed in an autoclave equipped with a Teflon liner (20 ml) and then heated at 433 K for 4 d. Crystals of the title compound were obtained by slow evaporation of the solvent at room temperature.

Structure description top

Computing details top

Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); 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 (Sheldrick, 2008).

Figures top

Fig. 1. Molecular structure of the title compound. Displacement ellipsoids are shown at the 30% probability level. Open bonds show minor disordered sites. H atoms have been omitted for clarity.

Diaquabis(5-carboxy-2-propyl-1H-imidazole-4-carboxylato -κ²N³,O⁴)zinc(II) 3.5-hydrate top

Crystal data top

[Zn(C₈H₉N₂O₄)₂(H₂O)₂]·3.5H₂O	Z = 2
M_r = 558.82	F(000) = 582
Triclinic, P1	D_x = 1.510 Mg m⁻³
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 10.4780 (18) Å	Cell parameters from 3600 reflections
b = 10.5729 (18) Å	θ = 1.4–28°
c = 11.3012 (19) Å	µ = 1.07 mm⁻¹
α = 81.783 (2)°	T = 296 K
β = 83.035 (2)°	Block, colorless
γ = 86.852 (2)°	0.29 × 0.24 × 0.21 mm
V = 1229.1 (4) Å³

Data collection top

Bruker APEXII CCD diffractometer	4360 independent reflections
Radiation source: fine-focus sealed tube	3172 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.033
φ and ω scan	θ_max = 25.2°, θ_min = 1.8°
Absorption correction: multi-scan (SADABS; Bruker, 2001)	h = −10→12
T_min = 0.747, T_max = 0.806	k = −11→12
6393 measured reflections	l = −11→13

Refinement top

Refinement on F²	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.056	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.160	H-atom parameters constrained
S = 1.07	w = 1/[σ²(F_o²) + (0.0755P)² + 0.5831P] where P = (F_o² + 2F_c²)/3
4360 reflections	(Δ/σ)_max < 0.001
342 parameters	Δρ_max = 0.81 e Å⁻³
24 restraints	Δρ_min = −0.72 e Å⁻³

Crystal data top

[Zn(C₈H₉N₂O₄)₂(H₂O)₂]·3.5H₂O	γ = 86.852 (2)°
M_r = 558.82	V = 1229.1 (4) Å³
Triclinic, P1	Z = 2
a = 10.4780 (18) Å	Mo Kα radiation
b = 10.5729 (18) Å	µ = 1.07 mm⁻¹
c = 11.3012 (19) Å	T = 296 K
α = 81.783 (2)°	0.29 × 0.24 × 0.21 mm
β = 83.035 (2)°

Data collection top

Bruker APEXII CCD diffractometer	4360 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2001)	3172 reflections with I > 2σ(I)
T_min = 0.747, T_max = 0.806	R_int = 0.033
6393 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.056	24 restraints
wR(F²) = 0.160	H-atom parameters constrained
S = 1.07	Δρ_max = 0.81 e Å⁻³
4360 reflections	Δρ_min = −0.72 e Å⁻³
342 parameters

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq	Occ. (<1)
Zn1	0.84596 (6)	0.28957 (6)	0.19279 (5)	0.0468 (3)
O1	0.8745 (5)	−0.1862 (4)	0.5169 (4)	0.0652 (12)
H1	0.8821	−0.1583	0.4450	0.098*
O2	0.8364 (4)	−0.1087 (4)	0.6884 (4)	0.0677 (12)
O3	0.8898 (4)	0.0899 (4)	0.1842 (3)	0.0505 (9)
O4	0.8972 (4)	−0.1006 (4)	0.2975 (3)	0.0604 (11)
O5	0.7797 (4)	0.4859 (3)	0.2071 (3)	0.0522 (10)
O6	0.6119 (4)	0.6225 (4)	0.1874 (4)	0.0647 (11)
O7	0.3908 (4)	0.6171 (4)	0.1402 (4)	0.0595 (11)
H7	0.4644	0.6156	0.1581	0.089*
O8	0.2581 (4)	0.4768 (4)	0.0987 (4)	0.0590 (11)
N1	0.8293 (4)	0.2124 (4)	0.3764 (4)	0.0432 (10)
N2	0.8107 (4)	0.1425 (4)	0.5690 (4)	0.0521 (12)
H2	0.7979	0.1424	0.6456	0.062*
N3	0.6451 (4)	0.2860 (4)	0.1716 (4)	0.0399 (10)
N4	0.4524 (4)	0.2803 (4)	0.1319 (4)	0.0466 (11)
H4	0.3826	0.2499	0.1168	0.056*
C1	0.8351 (5)	0.0371 (5)	0.5118 (4)	0.0412 (12)
C2	0.8473 (4)	0.0830 (5)	0.3922 (4)	0.0386 (11)
C3	0.8102 (6)	0.2472 (6)	0.4847 (5)	0.0561 (15)
C4	0.8810 (5)	0.0187 (5)	0.2833 (5)	0.0444 (13)
C5	0.8477 (5)	−0.0920 (6)	0.5795 (5)	0.0517 (14)
C6A	0.8065 (10)	0.3828 (11)	0.5113 (11)	0.070 (3)	0.753 (7)
H6A	0.8542	0.4358	0.4453	0.083*	0.753 (7)
H6B	0.8468	0.3860	0.5836	0.083*	0.753 (7)
C7A	0.6671 (10)	0.4347 (9)	0.5286 (9)	0.083 (3)	0.753 (7)
H7A	0.6233	0.4217	0.4607	0.100*	0.753 (7)
H7B	0.6222	0.3891	0.6010	0.100*	0.753 (7)
C8A	0.6658 (14)	0.5762 (10)	0.5390 (12)	0.129 (5)	0.753 (7)
H8A	0.5796	0.6054	0.5640	0.193*	0.753 (7)
H8B	0.6957	0.6228	0.4623	0.193*	0.753 (7)
H8C	0.7211	0.5900	0.5973	0.193*	0.753 (7)
C6B	0.742 (4)	0.367 (4)	0.522 (4)	0.070 (3)	0.247 (7)
H6C	0.6885	0.3479	0.5983	0.083*	0.247 (7)
H6D	0.6894	0.4072	0.4618	0.083*	0.247 (7)
C7B	0.852 (3)	0.453 (3)	0.535 (3)	0.083 (3)	0.247 (7)
H7C	0.9083	0.4631	0.4596	0.100*	0.247 (7)
H7D	0.8155	0.5368	0.5476	0.100*	0.247 (7)
C8B	0.933 (4)	0.405 (3)	0.636 (3)	0.129 (5)	0.247 (7)
H8D	0.9985	0.4647	0.6367	0.193*	0.247 (7)
H8E	0.9724	0.3233	0.6228	0.193*	0.247 (7)
H8F	0.8792	0.3969	0.7111	0.193*	0.247 (7)
C9	0.5881 (5)	0.4058 (5)	0.1698 (4)	0.0401 (12)
C10	0.4645 (5)	0.4030 (5)	0.1425 (4)	0.0408 (12)
C11	0.5583 (5)	0.2111 (5)	0.1471 (5)	0.0464 (13)
C12	0.6653 (5)	0.5103 (5)	0.1892 (5)	0.0470 (13)
C13	0.3619 (5)	0.5037 (6)	0.1269 (5)	0.0476 (14)
C14A	0.560 (3)	0.0677 (8)	0.1631 (19)	0.057 (4)	0.525 (10)
H14A	0.6447	0.0341	0.1364	0.069*	0.525 (10)
H14B	0.4986	0.0391	0.1157	0.069*	0.525 (10)
C15A	0.522 (2)	0.0179 (12)	0.3023 (15)	0.079 (4)	0.525 (10)
H15A	0.5775	0.0541	0.3504	0.095*	0.525 (10)
H15B	0.4337	0.0440	0.3269	0.095*	0.525 (10)
C16A	0.5373 (18)	−0.1247 (14)	0.3208 (18)	0.114 (6)	0.525 (10)
H16A	0.6111	−0.1500	0.3625	0.171*	0.525 (10)
H16B	0.5487	−0.1554	0.2441	0.171*	0.525 (10)
H16C	0.4618	−0.1602	0.3677	0.171*	0.525 (10)
C14B	0.590 (3)	0.0766 (10)	0.122 (2)	0.057 (4)	0.475 (10)
H14C	0.6787	0.0534	0.1332	0.069*	0.475 (10)
H14D	0.5784	0.0700	0.0387	0.069*	0.475 (10)
C15B	0.4966 (14)	−0.0173 (14)	0.2106 (15)	0.079 (4)	0.475 (10)
H15C	0.4078	0.0101	0.2028	0.095*	0.475 (10)
H15D	0.5095	−0.1032	0.1895	0.095*	0.475 (10)
C16B	0.523 (3)	−0.017 (2)	0.3369 (18)	0.114 (6)	0.475 (10)
H16D	0.4858	−0.0906	0.3866	0.171*	0.475 (10)
H16E	0.4861	0.0592	0.3656	0.171*	0.475 (10)
H16F	0.6143	−0.0210	0.3401	0.171*	0.475 (10)
O1W	0.8877 (4)	0.3308 (5)	0.0105 (4)	0.0795 (15)
H1W	0.9491	0.2983	−0.0309	0.119*
H2W	0.8511	0.3925	−0.0291	0.119*
O2W	1.0370 (4)	0.3313 (4)	0.2110 (4)	0.0789 (14)
H3W	1.0823	0.3900	0.1747	0.118*
H4W	1.0782	0.2755	0.2525	0.118*
O3W	0.9078 (8)	0.0156 (7)	0.9598 (7)	0.058 (2)	0.50
H5W	0.9780	−0.0146	0.9293	0.087*	0.50
H6W	0.9159	0.0441	1.0240	0.087*	0.50
O4W	0.7783 (6)	0.1691 (6)	0.8082 (4)	0.123 (2)
H7W	0.8323	0.1232	0.8463	0.185*
H8W	0.7604	0.2379	0.8361	0.185*
O5W	0.1009 (4)	0.2742 (4)	0.8694 (4)	0.0798 (14)
H9W	0.1112	0.3450	0.8245	0.120*
H10W	0.0969	0.2146	0.8273	0.120*
O6W	0.2574 (5)	0.1562 (6)	0.0392 (5)	0.111 (2)
H11W	0.2034	0.0991	0.0448	0.167*
H12W	0.2230	0.2297	0.0243	0.167*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Zn1	0.0433 (4)	0.0509 (4)	0.0425 (4)	0.0042 (3)	−0.0065 (3)	0.0058 (3)
O1	0.080 (3)	0.051 (2)	0.060 (3)	0.000 (2)	−0.014 (2)	0.009 (2)
O2	0.067 (3)	0.081 (3)	0.044 (2)	0.009 (2)	−0.002 (2)	0.017 (2)
O3	0.056 (2)	0.058 (2)	0.034 (2)	0.0147 (18)	−0.0051 (16)	−0.0036 (17)
O4	0.083 (3)	0.049 (2)	0.050 (2)	0.011 (2)	−0.016 (2)	−0.0082 (19)
O5	0.049 (2)	0.049 (2)	0.060 (2)	−0.0048 (18)	−0.0141 (18)	−0.0019 (18)
O6	0.071 (3)	0.044 (2)	0.081 (3)	0.003 (2)	−0.016 (2)	−0.014 (2)
O7	0.049 (2)	0.054 (2)	0.074 (3)	0.0143 (19)	−0.010 (2)	−0.006 (2)
O8	0.040 (2)	0.065 (3)	0.066 (3)	0.0044 (19)	−0.0078 (19)	0.011 (2)
N1	0.044 (3)	0.046 (3)	0.038 (2)	0.002 (2)	−0.0067 (19)	−0.004 (2)
N2	0.057 (3)	0.063 (3)	0.035 (2)	0.007 (2)	−0.005 (2)	−0.006 (2)
N3	0.038 (2)	0.037 (2)	0.043 (2)	0.0037 (19)	−0.0076 (18)	0.0008 (18)
N4	0.040 (3)	0.049 (3)	0.049 (3)	−0.006 (2)	−0.008 (2)	0.003 (2)
C1	0.035 (3)	0.048 (3)	0.039 (3)	−0.003 (2)	−0.003 (2)	0.000 (2)
C2	0.033 (3)	0.043 (3)	0.039 (3)	−0.003 (2)	−0.008 (2)	−0.002 (2)
C3	0.071 (4)	0.052 (3)	0.046 (3)	0.009 (3)	−0.013 (3)	−0.007 (3)
C4	0.040 (3)	0.052 (3)	0.041 (3)	0.007 (2)	−0.011 (2)	−0.007 (3)
C5	0.041 (3)	0.062 (4)	0.048 (3)	0.001 (3)	−0.007 (3)	0.007 (3)
C6A	0.091 (10)	0.058 (6)	0.062 (5)	−0.003 (7)	−0.010 (7)	−0.015 (4)
C7A	0.100 (8)	0.062 (6)	0.086 (7)	0.005 (6)	0.000 (6)	−0.015 (5)
C8A	0.182 (14)	0.063 (6)	0.136 (11)	0.022 (7)	0.006 (10)	−0.023 (7)
C6B	0.091 (10)	0.058 (6)	0.062 (5)	−0.003 (7)	−0.010 (7)	−0.015 (4)
C7B	0.100 (8)	0.062 (6)	0.086 (7)	0.005 (6)	0.000 (6)	−0.015 (5)
C8B	0.182 (14)	0.063 (6)	0.136 (11)	0.022 (7)	0.006 (10)	−0.023 (7)
C9	0.043 (3)	0.039 (3)	0.034 (3)	0.002 (2)	−0.001 (2)	0.004 (2)
C10	0.042 (3)	0.040 (3)	0.037 (3)	−0.001 (2)	−0.005 (2)	0.004 (2)
C11	0.045 (3)	0.042 (3)	0.052 (3)	0.001 (3)	−0.014 (2)	0.001 (2)
C12	0.048 (3)	0.047 (3)	0.045 (3)	−0.002 (3)	−0.003 (2)	−0.005 (2)
C13	0.042 (3)	0.057 (4)	0.038 (3)	0.002 (3)	0.003 (2)	0.006 (3)
C14A	0.035 (12)	0.042 (4)	0.092 (13)	−0.007 (4)	−0.007 (9)	0.003 (5)
C15A	0.066 (7)	0.050 (6)	0.121 (11)	−0.004 (5)	−0.029 (7)	0.005 (7)
C16A	0.111 (11)	0.078 (9)	0.139 (13)	0.004 (10)	−0.010 (9)	0.023 (10)
C14B	0.035 (12)	0.042 (4)	0.092 (13)	−0.007 (4)	−0.007 (9)	0.003 (5)
C15B	0.066 (7)	0.050 (6)	0.121 (11)	−0.004 (5)	−0.029 (7)	0.005 (7)
C16B	0.111 (11)	0.078 (9)	0.139 (13)	0.004 (10)	−0.010 (9)	0.023 (10)
O1W	0.065 (3)	0.106 (4)	0.049 (2)	0.039 (3)	0.007 (2)	0.025 (2)
O2W	0.049 (3)	0.085 (3)	0.091 (3)	−0.013 (2)	−0.019 (2)	0.042 (3)
O3W	0.066 (5)	0.065 (5)	0.045 (4)	0.005 (4)	−0.007 (4)	−0.017 (4)
O4W	0.166 (6)	0.143 (5)	0.067 (3)	0.070 (5)	−0.032 (4)	−0.053 (3)
O5W	0.077 (3)	0.074 (3)	0.090 (3)	−0.022 (2)	0.016 (3)	−0.031 (3)
O6W	0.109 (5)	0.104 (4)	0.140 (5)	0.005 (3)	−0.061 (4)	−0.048 (4)

Geometric parameters (Å, º) top

Zn1—O1W	2.042 (4)	C6B—H6D	0.9700
Zn1—N1	2.108 (4)	C7B—C8B	1.512 (17)
Zn1—O2W	2.113 (4)	C7B—H7C	0.9700
Zn1—O3	2.149 (4)	C7B—H7D	0.9700
Zn1—N3	2.149 (4)	C8B—H8D	0.9600
Zn1—O5	2.174 (4)	C8B—H8E	0.9600
O1—C5	1.301 (7)	C8B—H8F	0.9600
O1—H1	0.8200	C9—C10	1.370 (7)
O2—C5	1.210 (6)	C9—C12	1.460 (8)
O3—C4	1.253 (6)	C10—C13	1.479 (7)
O4—C4	1.254 (6)	C11—C14A	1.500 (10)
O5—C12	1.246 (6)	C11—C14B	1.502 (11)
O6—C12	1.282 (6)	C14A—C15A	1.594 (18)
O7—C13	1.286 (7)	C14A—H14A	0.9700
O7—H7	0.8200	C14A—H14B	0.9700
O8—C13	1.229 (7)	C15A—C16A	1.494 (15)
N1—C3	1.318 (7)	C15A—H15A	0.9700
N1—C2	1.360 (6)	C15A—H15B	0.9700
N2—C3	1.353 (7)	C16A—H16A	0.9600
N2—C1	1.363 (7)	C16A—H16B	0.9600
N2—H2	0.8600	C16A—H16C	0.9600
N3—C11	1.318 (7)	C14B—C15B	1.592 (18)
N3—C9	1.369 (6)	C14B—H14C	0.9700
N4—C11	1.311 (6)	C14B—H14D	0.9700
N4—C10	1.334 (7)	C15B—C16B	1.487 (17)
N4—H4	0.8600	C15B—H15C	0.9700
C1—C2	1.363 (7)	C15B—H15D	0.9700
C1—C5	1.474 (7)	C16B—H16D	0.9600
C2—C4	1.486 (7)	C16B—H16E	0.9600
C3—C6A	1.504 (13)	C16B—H16F	0.9600
C3—C6B	1.51 (4)	O1W—H1W	0.8363
C6A—C7A	1.531 (13)	O1W—H2W	0.8393
C6A—H6A	0.9700	O2W—H3W	0.8323
C6A—H6B	0.9700	O2W—H4W	0.8337
C7A—C8A	1.517 (13)	O3W—H5W	0.8402
C7A—H7A	0.9700	O3W—H6W	0.8405
C7A—H7B	0.9700	O4W—H7W	0.8420
C8A—H8A	0.9600	O4W—H8W	0.8374
C8A—H8B	0.9600	O5W—H9W	0.8466
C8A—H8C	0.9600	O5W—H10W	0.8485
C6B—C7B	1.539 (17)	O6W—H11W	0.8409
C6B—H6C	0.9700	O6W—H12W	0.8416

O1W—Zn1—N1	167.71 (16)	C6B—C7B—H7C	108.4
O1W—Zn1—O2W	88.74 (19)	C8B—C7B—H7D	108.4
N1—Zn1—O2W	87.04 (16)	C6B—C7B—H7D	108.4
O1W—Zn1—O3	90.84 (16)	H7C—C7B—H7D	107.5
N1—Zn1—O3	77.98 (14)	C7B—C8B—H8D	109.5
O2W—Zn1—O3	94.19 (17)	C7B—C8B—H8E	109.5
O1W—Zn1—N3	89.81 (17)	H8D—C8B—H8E	109.5
N1—Zn1—N3	96.47 (16)	C7B—C8B—H8F	109.5
O2W—Zn1—N3	169.05 (16)	H8D—C8B—H8F	109.5
O3—Zn1—N3	96.68 (15)	H8E—C8B—H8F	109.5
O1W—Zn1—O5	91.52 (16)	N3—C9—C10	109.4 (5)
N1—Zn1—O5	100.14 (15)	N3—C9—C12	118.4 (5)
O2W—Zn1—O5	91.72 (16)	C10—C9—C12	132.1 (5)
O3—Zn1—O5	173.69 (14)	N4—C10—C9	103.1 (4)
N3—Zn1—O5	77.47 (15)	N4—C10—C13	124.6 (5)
C5—O1—H1	109.5	C9—C10—C13	132.3 (5)
C4—O3—Zn1	115.7 (3)	N4—C11—N3	108.1 (5)
C12—O5—Zn1	114.6 (3)	N4—C11—C14A	121.7 (13)
C13—O7—H7	109.5	N3—C11—C14A	128.5 (14)
C3—N1—C2	106.5 (4)	N4—C11—C14B	128.3 (15)
C3—N1—Zn1	141.4 (4)	N3—C11—C14B	122.8 (15)
C2—N1—Zn1	112.0 (3)	O5—C12—O6	123.2 (5)
C3—N2—C1	108.5 (4)	O5—C12—C9	118.4 (5)
C3—N2—H2	125.8	O6—C12—C9	118.3 (5)
C1—N2—H2	125.8	O8—C13—O7	124.2 (5)
C11—N3—C9	106.7 (4)	O8—C13—C10	119.6 (5)
C11—N3—Zn1	142.0 (3)	O7—C13—C10	116.2 (5)
C9—N3—Zn1	110.9 (3)	C11—C14A—C15A	108.3 (10)
C11—N4—C10	112.7 (5)	C11—C14A—H14A	110.0
C11—N4—H4	123.6	C15A—C14A—H14A	110.0
C10—N4—H4	123.6	C11—C14A—H14B	110.0
N2—C1—C2	105.1 (4)	C15A—C14A—H14B	110.0
N2—C1—C5	121.5 (5)	H14A—C14A—H14B	108.4
C2—C1—C5	133.4 (5)	C16A—C15A—C14A	108.5 (13)
N1—C2—C1	110.1 (4)	C16A—C15A—H15A	110.0
N1—C2—C4	117.9 (4)	C14A—C15A—H15A	110.0
C1—C2—C4	131.9 (5)	C16A—C15A—H15B	110.0
N1—C3—N2	109.8 (5)	C14A—C15A—H15B	110.0
N1—C3—C6A	125.1 (7)	H15A—C15A—H15B	108.4
N2—C3—C6A	124.6 (7)	C11—C14B—C15B	108.7 (12)
N1—C3—C6B	128.2 (18)	C11—C14B—H14C	109.9
N2—C3—C6B	117.2 (18)	C15B—C14B—H14C	109.9
O3—C4—O4	125.6 (5)	C11—C14B—H14D	109.9
O3—C4—C2	116.3 (5)	C15B—C14B—H14D	109.9
O4—C4—C2	118.1 (5)	H14C—C14B—H14D	108.3
O2—C5—O1	121.8 (5)	C16B—C15B—C14B	110.1 (19)
O2—C5—C1	121.2 (6)	C16B—C15B—H15C	109.6
O1—C5—C1	117.0 (5)	C14B—C15B—H15C	109.6
C3—C6A—C7A	110.2 (9)	C16B—C15B—H15D	109.6
C3—C6A—H6A	109.6	C14B—C15B—H15D	109.6
C7A—C6A—H6A	109.6	H15C—C15B—H15D	108.1
C3—C6A—H6B	109.6	C15B—C16B—H16D	109.5
C7A—C6A—H6B	109.6	C15B—C16B—H16E	109.5
H6A—C6A—H6B	108.1	H16D—C16B—H16E	109.5
C8A—C7A—C6A	109.4 (10)	C15B—C16B—H16F	109.5
C8A—C7A—H7A	109.8	H16D—C16B—H16F	109.5
C6A—C7A—H7A	109.8	H16E—C16B—H16F	109.5
C8A—C7A—H7B	109.8	Zn1—O1W—H1W	125.4
C6A—C7A—H7B	109.8	Zn1—O1W—H2W	121.6
H7A—C7A—H7B	108.2	H1W—O1W—H2W	112.2
C3—C6B—C7B	104 (3)	Zn1—O2W—H3W	129.7
C3—C6B—H6C	110.9	Zn1—O2W—H4W	116.4
C7B—C6B—H6C	110.9	H3W—O2W—H4W	113.1
C3—C6B—H6D	110.9	H5W—O3W—H6W	111.6
C7B—C6B—H6D	110.9	H7W—O4W—H8W	111.8
H6C—C6B—H6D	109.0	H9W—O5W—H10W	110.3
C8B—C7B—C6B	115 (3)	H11W—O6W—H12W	111.4
C8B—C7B—H7C	108.4

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1···O4	0.82	1.68	2.502 (6)	180
O7—H7···O6	0.82	1.63	2.445 (6)	176
N2—H2···O4W	0.86	1.88	2.737 (6)	171
N4—H4···O6W	0.86	2.03	2.863 (6)	162
O1W—H1W···O5Wⁱ	0.84	1.86	2.675 (6)	164
O1W—H2W···O8ⁱⁱ	0.84	1.89	2.720 (5)	170
O2W—H3W···O8ⁱⁱⁱ	0.83	2.13	2.910 (6)	155
O2W—H4W···O2^iv	0.83	2.00	2.802 (6)	161
O3W—H5W···O3^iv	0.84	1.98	2.795 (8)	162
O3W—H6W···O3^v	0.84	1.92	2.743 (8)	165
O4W—H7W···O3W	0.84	1.81	2.633 (9)	163
O4W—H8W···O7^vi	0.84	2.16	2.877 (6)	143
O5W—H9W···O5^vi	0.85	2.14	2.865 (6)	144
O5W—H10W···O4^vii	0.85	1.98	2.812 (6)	169
O6W—H11W···O3W^vii	0.84	1.74	2.574 (10)	174
O6W—H12W···O5W^viii	0.84	2.27	2.789 (7)	120

Symmetry codes: (i) x+1, y, z−1; (ii) −x+1, −y+1, −z; (iii) x+1, y, z; (iv) −x+2, −y, −z+1; (v) x, y, z+1; (vi) −x+1, −y+1, −z+1; (vii) −x+1, −y, −z+1; (viii) x, y, z−1.

Experimental details

Crystal data
Chemical formula	[Zn(C₈H₉N₂O₄)₂(H₂O)₂]·3.5H₂O
M_r	558.82
Crystal system, space group	Triclinic, P1
Temperature (K)	296
a, b, c (Å)	10.4780 (18), 10.5729 (18), 11.3012 (19)
α, β, γ (°)	81.783 (2), 83.035 (2), 86.852 (2)
V (Å³)	1229.1 (4)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	1.07
Crystal size (mm)	0.29 × 0.24 × 0.21

Data collection
Diffractometer	Bruker APEXII CCD
Absorption correction	Multi-scan (SADABS; Bruker, 2001)
T_min, T_max	0.747, 0.806
No. of measured, independent and observed [I > 2σ(I)] reflections	6393, 4360, 3172
R_int	0.033
(sin θ/λ)_max (Å⁻¹)	0.599

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.056, 0.160, 1.07
No. of reflections	4360
No. of parameters	342
No. of restraints	24
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.81, −0.72

Computer programs: APEX2 (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1···O4	0.82	1.68	2.502 (6)	180
O7—H7···O6	0.82	1.63	2.445 (6)	176
N2—H2···O4W	0.86	1.88	2.737 (6)	171
N4—H4···O6W	0.86	2.03	2.863 (6)	162
O1W—H1W···O5Wⁱ	0.84	1.86	2.675 (6)	164
O1W—H2W···O8ⁱⁱ	0.84	1.89	2.720 (5)	170
O2W—H3W···O8ⁱⁱⁱ	0.83	2.13	2.910 (6)	155
O2W—H4W···O2^iv	0.83	2.00	2.802 (6)	161
O3W—H5W···O3^iv	0.84	1.98	2.795 (8)	162
O3W—H6W···O3^v	0.84	1.92	2.743 (8)	165
O4W—H7W···O3W	0.84	1.81	2.633 (9)	163
O4W—H8W···O7^vi	0.84	2.16	2.877 (6)	143
O5W—H9W···O5^vi	0.85	2.14	2.865 (6)	144
O5W—H10W···O4^vii	0.85	1.98	2.812 (6)	169
O6W—H11W···O3W^vii	0.84	1.74	2.574 (10)	174
O6W—H12W···O5W^viii	0.84	2.27	2.789 (7)	120

Symmetry codes: (i) x+1, y, z−1; (ii) −x+1, −y+1, −z; (iii) x+1, y, z; (iv) −x+2, −y, −z+1; (v) x, y, z+1; (vi) −x+1, −y+1, −z+1; (vii) −x+1, −y, −z+1; (viii) x, y, z−1.

Acknowledgements

This work was supported by the Nonprofit Industry Foundation of the National Ocean Administration of China (grant No. 2000905021), the Guangdong Oceanic Fisheries Technology Promotion Project [grant No. A2009003-018(c)], the Guangdong Chinese Academy of Science Comprehensive Strategic Cooperation Project (grant No. 2009B091300121), the Guangdong Province Key Project in the Field of Social Development [grant No. A2009011-007(c)], the Science and Technology Department of Guangdong Province Project (grant No. 00087061110314018) and the Guangdong Natural Science Foundation (No. 9252408801000002).

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