catena-Poly[[tetra­aqua­(μ-4,4′-bipyridine-κ2N:N′)zinc(II)] fumarate tetra­hydrate]

Tian, Y.; Wu, Y.-P.; Li, D.-S.; Wang, H.; Wang, J.-W.

doi:10.1107/S1600536808009227

metal-organic compounds

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ISSN: 2056-9890

Volume 64| Part 5| May 2008| Pages m662-m663

doi:10.1107/S1600536808009227

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catena-Poly[[tetraaqua(μ-4,4′-bipyridine-κ²N:N′)zinc(II)] fumarate tetrahydrate]

Yong Tian,^a Ya-Pan Wu,^b Dong-Sheng Li,^a,^b ^* Hui Wang ^a and Ji-Wu Wang ^b

^aDepartment of Chemistry, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University, Xi'an 710069, People's Republic of China, and ^bDepartment of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan'an University, Yan'an 716000, People's Republic of China
^*Correspondence e-mail: lidongsheng1@126.com

(Received 27 February 2008; accepted 4 April 2008; online 16 April 2008)

In the title compound, {[Zn(C₁₀H₈N₂)(H₂O)₄](C₄H₂O₄)·4H₂O}_n, the Zn^II atom is coordinated by two N atoms from two μ-4,4′-bipyridine ligands and four water molecules in a distorted octahedral geometry. The coordination unit is extended through the Zn—N bond, leading to a one-dimensional cationic chain. A twofold rotation axis passes through the Zn atom and along the axis of the 4,4′-bipyridine ligand. Each uncoordinated water molecule acts as both hydrogen-bond donor and acceptor. A three-dimensional network is constructed through hydrogen bonds involving water molecules and fumarate dianions.

Related literature

For related literature, see: Lu et al. (2006 ); Moulton & Zaworotko (2001 ); Nordell et al. (2003 ); Wagner et al. (2002 ); Wen et al. (2005 ); Yaghi et al. (1997 ); Zaworotko (2001 ); Zhou et al. (2007 ).

Experimental

Crystal data

[Zn(C₁₀H₈N₂)(H₂O)₄](C₄H₂O₄)·4H₂O
M_r = 479.74
Monoclinic, C 2/c
a = 17.094 (5) Å
b = 11.394 (3) Å
c = 13.082 (6) Å
β = 126.652 (2)°
V = 2044.3 (12) Å³
Z = 4
Mo Kα radiation
μ = 1.26 mm⁻¹
T = 293 (2) K
0.39 × 0.28 × 0.26 mm

Data collection

Bruker SMART APEXII CCD area-detector diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.626, T_max = 0.712
7538 measured reflections
1907 independent reflections
1724 reflections with I > 2σ(I)
R_int = 0.051

Refinement

R[F² > 2σ(F²)] = 0.040
wR(F²) = 0.112
S = 1.09
1907 reflections
134 parameters
H-atom parameters constrained
Δρ_max = 0.98 e Å⁻³
Δρ_min = −0.86 e Å⁻³

Table 1
Selected geometric parameters (Å, °)

Zn1—O2	2.0697 (18)
Zn1—N2ⁱ	2.133 (3)
Zn1—N1	2.146 (3)
Zn1—O1	2.186 (2)

O2ⁱⁱ—Zn1—O2	179.01 (9)
O2—Zn1—N2ⁱ	89.50 (4)
O2—Zn1—N1	90.50 (4)
O2—Zn1—O1ⁱⁱ	91.97 (7)
O2—Zn1—O1	88.01 (7)
N2ⁱ—Zn1—O1	89.21 (4)
N1—Zn1—O1	90.79 (4)
O1ⁱⁱ—Zn1—O1	178.43 (8)
Symmetry codes: (i) x, y-1, z; (ii) $[-x+1, y, -z+{\script{3\over 2}}]$ .

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1W⋯O3ⁱⁱⁱ	0.83	1.93	2.757 (2)	173
O1—H2W⋯O4^iv	0.83	2.01	2.835 (3)	172
O2—H3W⋯O3	0.83	1.91	2.732 (2)	172
O2—H4W⋯O6^v	0.82	1.83	2.623 (3)	162
O3—H5W⋯O5	0.83	1.88	2.707 (3)	173
O3—H6W⋯O4^iv	0.82	2.10	2.911 (3)	172
O4—H7W⋯O6^v	0.83	2.00	2.832 (3)	175
O4—H8W⋯O5	0.83	1.99	2.811 (3)	169
Symmetry codes: (iii) $[-x+{\script{1\over 2}}, -y+{\script{1\over 2}}, -z+1]$ ; (iv) $[x, -y+1, z-{\script{1\over 2}}]$ ; (v) $[-x+{\script{1\over 2}}, y-{\script{1\over 2}}, -z+{\script{3\over 2}}]$ .

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, global. DOI: 10.1107/S1600536808009227/hy2122sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536808009227/hy2122Isup2.hkl

checkCIF report

Comment top

Coordination polymer networks represent a result of applying supramolecular concepts to the design of new functional solids and are well exemplified by compounds in which transition metal centers (nodes) are connected by linear bidentate organic ligands (spacer groups) such as 4,4'-bipyridine (Lu et al., 2006; Nordell et al., 2003; Wagner et al., 2002; Wen et al., 2005; Yaghi et al., 1997; Zhou et al., 2007). These supramolecular structures are of interest as they provide opportunity for generating open framework compounds with controllable cavity sizes and they therefore have the potential to exhibit porosity and/or encapsulate guest molecules (Moulton & Zaworotko, 2001; Zaworotko, 2001).

The title compound consists of one [Zn(C₁₀H₈N₂) (H₂O)₄]²⁺ cation, one fumarate dianion and four lattice water molecules (Fig. 1). Each Zn^II atom is six-coordinated in an octahedral geometry with four O atoms of four water molecules in the equatorial plane and two N atoms from two µ-4,4'-bipyridine ligands in the axial sites, resulting a one-dimensional cationic chain along the b-axis. The two pyridyl rings of 4,4'-bipyridine present a torsion angle of 10.0 (2)°.

Each lattice water molecule acts as both hydrogen-bond donor and acceptor. In the crystal structure, the cationic chains are arranged parallel to the bc plane with the fumarate dianions and lattice water molecules located between the sheets composed of the chains. A three-dimensional supramolecular network is formed by hydrogen-bonding interactions involving the water molecules and fumarate dianions (Fig. 2).

Related literature top

For related literature, see: Lu et al. (2006); Moulton & Zaworotko (2001); Nordell et al. (2003); Wagner et al. (2002); Wen et al. (2005); Yaghi et al. (1997); Zaworotko (2001); Zhou et al. (2007).

Experimental top

A mixture of Zn(NO₃)₂.6H₂O (0.030 g, 0.1 mmol), 4,4'-bipyridine (0.016 g, 0.1 mmol), mercaptosuccinic acid (0.015 g, 0.1 mmol), NaOH (0.008 g, 0.2 mmol) and distilled water (10 ml) was sealed in a 25 ml Teflon-lined stainless autoclave and heated at 433 K for 72 h under autogenous pressure. After slowly cooling to room temperature, yellow block-like crystals of the title compound suitable for X-ray analysis were obtained from the reaction mixture by filtration.

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. The structure of the title compound. Displacement ellipsoids are drawn at the 30% probability level. [Symmetry codes: (i) 1 - x, y, 3/2 - z; (ii) 1/2 - x, 3/2 - y, 1 - z; (iii) x, -1 + y, z; (iv) x, 1 + y, z; (v) 1/2 - x, 1/2 - y, 1 - z; (vi) 1/2 - x, -1/2 + y, 3/2 - z.]
	Fig. 2. A view of the three-dimensional network in the title compound, viewed down the a axis.

catena-Poly[[tetraaqua(µ-4,4'-bipyridine- κ²N:N')zinc(II)] fumarate tetrahydrate] top

Crystal data top

[Zn(C₁₀H₈N₂)(H₂O)₄](C₄H₂O₄)·4H₂O	F(000) = 1000
M_r = 479.74	D_x = 1.559 Mg m⁻³
Monoclinic, C2/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2yc	Cell parameters from 3920 reflections
a = 17.094 (5) Å	θ = 2.3–28.2°
b = 11.394 (3) Å	µ = 1.27 mm⁻¹
c = 13.082 (6) Å	T = 293 K
β = 126.652 (2)°	Block, colorless
V = 2044.3 (12) Å³	0.39 × 0.28 × 0.26 mm
Z = 4

Data collection top

Bruker SMART APEXII CCD area-detector diffractometer	1907 independent reflections
Radiation source: fine-focus sealed tube	1724 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.051
ϕ and ω scans	θ_max = 25.5°, θ_min = 2.3°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −20→20
T_min = 0.626, T_max = 0.712	k = −13→13
7538 measured reflections	l = −15→15

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.040	H-atom parameters constrained
wR(F²) = 0.112	w = 1/[σ²(F_o²) + (0.0789P)² + 0.2551P] where P = (F_o² + 2F_c²)/3
S = 1.09	(Δ/σ)_max < 0.001
1907 reflections	Δρ_max = 0.99 e Å⁻³
134 parameters	Δρ_min = −0.86 e Å⁻³
0 restraints	Extinction correction: SHELXL97 (Sheldrick, 2008)
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0

Crystal data top

[Zn(C₁₀H₈N₂)(H₂O)₄](C₄H₂O₄)·4H₂O	V = 2044.3 (12) Å³
M_r = 479.74	Z = 4
Monoclinic, C2/c	Mo Kα radiation
a = 17.094 (5) Å	µ = 1.27 mm⁻¹
b = 11.394 (3) Å	T = 293 K
c = 13.082 (6) Å	0.39 × 0.28 × 0.26 mm
β = 126.652 (2)°

Data collection top

Bruker SMART APEXII CCD area-detector diffractometer	1907 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	1724 reflections with I > 2σ(I)
T_min = 0.626, T_max = 0.712	R_int = 0.051
7538 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.040	0 restraints
wR(F²) = 0.112	H-atom parameters constrained
S = 1.09	Δρ_max = 0.99 e Å⁻³
1907 reflections	Δρ_min = −0.86 e Å⁻³
134 parameters

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

	x	y	z	U_iso*/U_eq
Zn1	0.5000	0.27603 (3)	0.7500	0.02705 (18)
O1	0.41826 (14)	0.27340 (13)	0.54278 (17)	0.0358 (4)
H1W	0.3814	0.2172	0.5259	0.054*
H2W	0.3864	0.3328	0.5041	0.054*
O2	0.36784 (13)	0.27446 (13)	0.72328 (17)	0.0358 (4)
H3W	0.3232	0.3120	0.6610	0.054*
H4W	0.3621	0.2706	0.7812	0.054*
O3	0.21520 (12)	0.40439 (15)	0.53213 (15)	0.0396 (4)
H5W	0.2070	0.4658	0.5581	0.059*
H6W	0.2331	0.4167	0.4872	0.059*
O4	0.29343 (13)	0.53785 (16)	0.89255 (16)	0.0454 (5)
H7W	0.3041	0.4667	0.8933	0.068*
H8W	0.2635	0.5646	0.8191	0.068*
O5	0.19945 (14)	0.59997 (17)	0.63613 (17)	0.0437 (4)
O6	0.17990 (18)	0.79445 (17)	0.6206 (2)	0.0499 (5)
N1	0.5000	0.4644 (2)	0.7500	0.0305 (6)
N2	0.5000	1.0888 (2)	0.7500	0.0281 (6)
C1	0.47776 (19)	0.5262 (2)	0.8170 (2)	0.0375 (6)
H1A	0.4613	0.4854	0.8633	0.045*
C2	0.47816 (19)	0.6469 (2)	0.8206 (2)	0.0352 (5)
H2A	0.4638	0.6856	0.8702	0.042*
C3	0.5000	0.7114 (3)	0.7500	0.0288 (7)
C4	0.5000	0.8413 (3)	0.7500	0.0286 (7)
C5	0.5361 (2)	0.9065 (2)	0.6958 (3)	0.0378 (6)
H5	0.5612	0.8681	0.6584	0.045*
C6	0.53453 (18)	1.0269 (2)	0.6974 (2)	0.0358 (5)
H6	0.5587	1.0677	0.6601	0.043*
C7	0.20633 (18)	0.6996 (2)	0.6001 (2)	0.0330 (5)
C8	0.24700 (18)	0.7029 (2)	0.5263 (2)	0.0355 (5)
H8	0.2699	0.6328	0.5167	0.043*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Zn1	0.0401 (3)	0.0197 (3)	0.0348 (3)	0.000	0.0296 (2)	0.000
O1	0.0500 (10)	0.0311 (10)	0.0364 (9)	−0.0015 (6)	0.0313 (8)	0.0004 (6)
O2	0.0455 (10)	0.0390 (11)	0.0419 (10)	0.0077 (7)	0.0362 (8)	0.0091 (7)
O3	0.0540 (10)	0.0334 (9)	0.0408 (9)	−0.0009 (7)	0.0334 (8)	−0.0006 (7)
O4	0.0691 (12)	0.0338 (10)	0.0394 (10)	0.0009 (8)	0.0357 (9)	0.0017 (7)
O5	0.0722 (12)	0.0362 (10)	0.0497 (10)	−0.0015 (9)	0.0509 (10)	0.0025 (8)
O6	0.0879 (15)	0.0365 (10)	0.0668 (13)	−0.0006 (9)	0.0685 (13)	0.0000 (9)
N1	0.0468 (15)	0.0214 (13)	0.0374 (14)	0.000	0.0327 (13)	0.000
N2	0.0357 (13)	0.0213 (13)	0.0346 (14)	0.000	0.0250 (12)	0.000
C1	0.0596 (15)	0.0256 (12)	0.0471 (14)	−0.0003 (11)	0.0424 (13)	0.0025 (11)
C2	0.0574 (14)	0.0249 (11)	0.0435 (13)	0.0034 (10)	0.0410 (12)	−0.0010 (10)
C3	0.0341 (16)	0.0228 (17)	0.0319 (16)	0.000	0.0211 (14)	0.000
C4	0.0354 (15)	0.0247 (16)	0.0308 (15)	0.000	0.0224 (13)	0.000
C5	0.0595 (15)	0.0249 (12)	0.0547 (15)	0.0010 (11)	0.0480 (13)	−0.0029 (11)
C6	0.0528 (13)	0.0271 (12)	0.0489 (14)	0.0000 (10)	0.0418 (12)	0.0019 (10)
C7	0.0462 (13)	0.0339 (12)	0.0312 (11)	−0.0023 (10)	0.0297 (11)	−0.0014 (10)
C8	0.0528 (14)	0.0326 (11)	0.0401 (13)	0.0016 (10)	0.0381 (12)	−0.0007 (10)

Geometric parameters (Å, º) top

Zn1—O2ⁱ	2.0697 (18)	N2—C6	1.344 (3)
Zn1—O2	2.0697 (18)	N2—C6ⁱ	1.344 (3)
Zn1—N2ⁱⁱ	2.133 (3)	N2—Zn1ⁱⁱⁱ	2.133 (3)
Zn1—N1	2.146 (3)	C1—C2	1.376 (3)
Zn1—O1ⁱ	2.186 (2)	C1—H1A	0.9300
Zn1—O1	2.186 (2)	C2—C3	1.394 (3)
O1—H1W	0.8300	C2—H2A	0.9300
O1—H2W	0.8259	C3—C2ⁱ	1.394 (3)
O2—H3W	0.8283	C3—C4	1.480 (5)
O2—H4W	0.8210	C4—C5	1.400 (3)
O3—H5W	0.8263	C4—C5ⁱ	1.400 (3)
O3—H6W	0.8200	C5—C6	1.372 (4)
O4—H7W	0.8299	C5—H5	0.9300
O4—H8W	0.8315	C6—H6	0.9300
O5—C7	1.261 (3)	C7—C8	1.490 (3)
O6—C7	1.261 (3)	C8—C8^iv	1.312 (5)
N1—C1ⁱ	1.345 (3)	C8—H8	0.9300
N1—C1	1.345 (3)

O2ⁱ—Zn1—O2	179.01 (9)	C6—N2—Zn1ⁱⁱⁱ	121.70 (14)
O2ⁱ—Zn1—N2ⁱⁱ	89.50 (4)	C6ⁱ—N2—Zn1ⁱⁱⁱ	121.70 (14)
O2—Zn1—N2ⁱⁱ	89.50 (4)	N1—C1—C2	123.2 (2)
O2ⁱ—Zn1—N1	90.50 (4)	N1—C1—H1A	118.4
O2—Zn1—N1	90.50 (4)	C2—C1—H1A	118.4
N2ⁱⁱ—Zn1—N1	179.999 (1)	C1—C2—C3	120.1 (2)
O2ⁱ—Zn1—O1ⁱ	88.01 (7)	C1—C2—H2A	119.9
O2—Zn1—O1ⁱ	91.97 (7)	C3—C2—H2A	119.9
N2ⁱⁱ—Zn1—O1ⁱ	89.21 (4)	C2ⁱ—C3—C2	116.4 (3)
N1—Zn1—O1ⁱ	90.79 (4)	C2ⁱ—C3—C4	121.79 (14)
O2ⁱ—Zn1—O1	91.98 (7)	C2—C3—C4	121.79 (14)
O2—Zn1—O1	88.01 (7)	C5—C4—C5ⁱ	115.9 (3)
N2ⁱⁱ—Zn1—O1	89.21 (4)	C5—C4—C3	122.05 (15)
N1—Zn1—O1	90.79 (4)	C5ⁱ—C4—C3	122.05 (15)
O1ⁱ—Zn1—O1	178.43 (8)	C6—C5—C4	120.3 (2)
Zn1—O1—H1W	99.4	C6—C5—H5	119.9
Zn1—O1—H2W	116.6	C4—C5—H5	119.9
H1W—O1—H2W	110.6	N2—C6—C5	123.5 (2)
Zn1—O2—H3W	115.7	N2—C6—H6	118.3
Zn1—O2—H4W	124.3	C5—C6—H6	118.3
H3W—O2—H4W	112.8	O6—C7—O5	124.5 (2)
H5W—O3—H6W	112.2	O6—C7—C8	118.8 (2)
H7W—O4—H8W	110.5	O5—C7—C8	116.7 (2)
C1ⁱ—N1—C1	116.8 (3)	C8^iv—C8—C7	124.9 (3)
C1ⁱ—N1—Zn1	121.60 (14)	C8^iv—C8—H8	117.5
C1—N1—Zn1	121.60 (14)	C7—C8—H8	117.5
C6—N2—C6ⁱ	116.6 (3)

O2ⁱ—Zn1—N1—C1ⁱ	45.69 (14)	C1—C2—C3—C4	179.23 (18)
O2—Zn1—N1—C1ⁱ	−134.31 (14)	C2ⁱ—C3—C4—C5	−10.02 (17)
O1ⁱ—Zn1—N1—C1ⁱ	133.71 (14)	C2—C3—C4—C5	169.98 (17)
O1—Zn1—N1—C1ⁱ	−46.29 (14)	C2ⁱ—C3—C4—C5ⁱ	169.97 (17)
O2ⁱ—Zn1—N1—C1	−134.31 (14)	C2—C3—C4—C5ⁱ	−10.02 (17)
O2—Zn1—N1—C1	45.69 (14)	C5ⁱ—C4—C5—C6	−0.19 (18)
O1ⁱ—Zn1—N1—C1	−46.29 (15)	C3—C4—C5—C6	179.81 (18)
O1—Zn1—N1—C1	133.70 (15)	C6ⁱ—N2—C6—C5	−0.21 (19)
C1ⁱ—N1—C1—C2	−0.83 (19)	Zn1ⁱⁱⁱ—N2—C6—C5	179.80 (19)
Zn1—N1—C1—C2	179.17 (19)	C4—C5—C6—N2	0.4 (4)
N1—C1—C2—C3	1.6 (4)	O6—C7—C8—C8^iv	−3.9 (5)
C1—C2—C3—C2ⁱ	−0.77 (18)	O5—C7—C8—C8^iv	174.9 (3)

Symmetry codes: (i) −x+1, y, −z+3/2; (ii) x, y−1, z; (iii) x, y+1, z; (iv) −x+1/2, −y+3/2, −z+1.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1W···O3^v	0.83	1.93	2.757 (2)	173
O1—H2W···O4^vi	0.83	2.01	2.835 (3)	172
O2—H3W···O3	0.83	1.91	2.732 (2)	172
O2—H4W···O6^vii	0.82	1.83	2.623 (3)	162
O3—H5W···O5	0.83	1.88	2.707 (3)	173
O3—H6W···O4^vi	0.82	2.10	2.911 (3)	172
O4—H7W···O6^vii	0.83	2.00	2.832 (3)	175
O4—H8W···O5	0.83	1.99	2.811 (3)	169

Symmetry codes: (v) −x+1/2, −y+1/2, −z+1; (vi) x, −y+1, z−1/2; (vii) −x+1/2, y−1/2, −z+3/2.

Experimental details

Crystal data
Chemical formula	[Zn(C₁₀H₈N₂)(H₂O)₄](C₄H₂O₄)·4H₂O
M_r	479.74
Crystal system, space group	Monoclinic, C2/c
Temperature (K)	293
a, b, c (Å)	17.094 (5), 11.394 (3), 13.082 (6)
β (°)	126.652 (2)
V (Å³)	2044.3 (12)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	1.27
Crystal size (mm)	0.39 × 0.28 × 0.26

Data collection
Diffractometer	Bruker SMART APEXII CCD area-detector diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.626, 0.712
No. of measured, independent and observed [I > 2σ(I)] reflections	7538, 1907, 1724
R_int	0.051
(sin θ/λ)_max (Å⁻¹)	0.606

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.040, 0.112, 1.09
No. of reflections	1907
No. of parameters	134
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.99, −0.86

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

Selected geometric parameters (Å, º) top

Zn1—O2	2.0697 (18)	Zn1—N1	2.146 (3)
Zn1—N2ⁱ	2.133 (3)	Zn1—O1	2.186 (2)

O2ⁱⁱ—Zn1—O2	179.01 (9)	O2—Zn1—O1	88.01 (7)
O2—Zn1—N2ⁱ	89.50 (4)	N2ⁱ—Zn1—O1	89.21 (4)
O2—Zn1—N1	90.50 (4)	N1—Zn1—O1	90.79 (4)
O2—Zn1—O1ⁱⁱ	91.97 (7)	O1ⁱⁱ—Zn1—O1	178.43 (8)

Symmetry codes: (i) x, y−1, z; (ii) −x+1, y, −z+3/2.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1W···O3ⁱⁱⁱ	0.83	1.93	2.757 (2)	173
O1—H2W···O4^iv	0.83	2.01	2.835 (3)	172
O2—H3W···O3	0.83	1.91	2.732 (2)	172
O2—H4W···O6^v	0.82	1.83	2.623 (3)	162
O3—H5W···O5	0.83	1.88	2.707 (3)	173
O3—H6W···O4^iv	0.82	2.10	2.911 (3)	172
O4—H7W···O6^v	0.83	2.00	2.832 (3)	175
O4—H8W···O5	0.83	1.99	2.811 (3)	169

Symmetry codes: (iii) −x+1/2, −y+1/2, −z+1; (iv) x, −y+1, z−1/2; (v) −x+1/2, y−1/2, −z+3/2.

Acknowledgements

This work was supported by the Natural Science Research Foundation of Shaanxi Provincial Education Office of China (grant No. 06JK155), the Natural Science Foundation of Shaanxi Province of China (grant No. 2006B08) and the Sustentatio Program for New-Century Elitists of the Ministry of Education, China (NCET-06-0891).

References

Bruker (2007). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Lu, W.-J., Zhu, Y.-M. & Zhong, K.-L. (2006). Acta Cryst. E62, m3036–m3038. Web of Science CSD CrossRef IUCr Journals Google Scholar
Moulton, B. & Zaworotko, M. J. (2001). Chem. Rev. 101, 1629–1658. Web of Science CrossRef PubMed CAS Google Scholar
Nordell, K. J., Higgins, K. A. & Smith, M. D. (2003). Acta Cryst. E59, m114–m115. Web of Science CSD CrossRef IUCr Journals Google Scholar
Sheldrick, G. M. (1996). SADABS. University of Göttingen, Germany. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Wagner, B. D., McManus, G. J., Moulton, B. & Zaworotko, M. J. (2002). Chem. Commun. pp. 2176–2177. Web of Science CSD CrossRef Google Scholar
Wen, L.-L., Dang, D.-B., Duan, C.-Y., Li, Y.-Z., Tian, Z.-F. & Meng, Q.-J. (2005). Inorg. Chem. 44, 7161–7170. Web of Science CSD CrossRef PubMed CAS Google Scholar
Yaghi, O. M., Li, H.-L. & Groy, T. L. (1997). Inorg. Chem. 36, 4292–4293. CSD CrossRef PubMed CAS Web of Science Google Scholar
Zaworotko, M. J. (2001). Chem. Commun. pp. 1–9. Web of Science CrossRef Google Scholar
Zhou, Y., Yao, J.-N., Liu, W.-S. & Yu, K.-B. (2007). Anal. Sci. 23, x245–x246. CAS Google Scholar

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