Tetra­kis­(μ-benzoato-κ2O:O′)bis{[4-(di­methyl­amino)­pyridine-κN1]zinc(II)}

Yu, Z.-Y.; Lin, K.-H.; Zhang, F.-F.; Shao, M.; Li, M.

doi:10.1107/S1600536811001188

metal-organic compounds

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ISSN: 2056-9890

Volume 67| Part 2| February 2011| Page m206

doi:10.1107/S1600536811001188

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Tetrakis(μ-benzoato-κ²O:O′)bis{[4-(dimethylamino)pyridine-κN¹]zinc(II)}

Zhe-Yin Yu,^a ^* Kun-Hua Lin,^b Fei-Fei Zhang,^b Min Shao ^c and Ming Li ^a

^aState Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China, ^bDepartment of Chemistry, College of Science, Shanghai University, Shanghai 200444, People's Republic of China, and ^cInstrumental Analysis and Research Center, Shanghai University, Shanghai 200444, People's Republic of China
^*Correspondence e-mail: yuzheyin09@sjtu.edu.cn

(Received 4 January 2011; accepted 9 January 2011; online 15 January 2011)

In the centrosymmetric binuclear title complex, [Zn₂(C₇H₅O₂)₄(C₇H₁₀N₂)₂], the Zn atoms [Zn⋯Zn = 3.0037 (6) Å] are bridged by four benzoate ligands. Each of the Zn atoms assumes an approximately square-pyramidal environment, with four O atoms in a plane and the pyridine N atom at the apical site.

Related literature

For the nucleophilic properties of 4-(dimethylamino)pyridine (DMAP), see: Fu (2000 ). For complexes of DMAP, see: Tyrra et al. (2003 ) and for complexes of DMAP which exhibit luminescence, see: Araki et al. (2005 ). For Zn⋯Zn distances in related structures, see: Anirban et al. (2006 ); Han et al. (2009 ); Konidaris et al. (2009 ); Wang et al. (2008 ).

Experimental

Crystal data

[Zn₂(C₇H₅O₂)₄(C₇H₁₀N₂)₂]
M_r = 859.56
Monoclinic, P 2₁ /n
a = 10.3146 (12) Å
b = 11.1558 (13) Å
c = 17.324 (2) Å
β = 95.616 (1)°
V = 1983.9 (4) Å³
Z = 2
Mo Kα radiation
μ = 1.27 mm⁻¹
T = 296 K
0.30 × 0.30 × 0.20 mm

Data collection

Bruker SMART CCD area-detector diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.702, T_max = 0.786
10123 measured reflections
3515 independent reflections
2860 reflections with I > 2σ(I)
R_int = 0.030

Refinement

R[F² > 2σ(F²)] = 0.031
wR(F²) = 0.066
S = 0.99
3515 reflections
255 parameters
H-atom parameters constrained
Δρ_max = 0.27 e Å⁻³
Δρ_min = −0.20 e Å⁻³

Table 1
Selected bond lengths (Å)

Zn1—N1	2.0134 (19)
Zn1—O3	2.0390 (18)
Zn1—O1	2.0467 (16)
Zn1—O2ⁱ	2.0472 (17)
Zn1—O4ⁱ	2.0782 (18)
Symmetry code: (i) -x+1, -y, -z.

Data collection: SMART (Bruker, 2000 ); cell refinement: SAINT (Bruker, 2000); 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 global, I. DOI: 10.1107/S1600536811001188/bq2273sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536811001188/bq2273Isup2.hkl

checkCIF report

Comment top

4-(dimethylamino)pyridine (DMAP) has good coordination ability, but there are few reports on its complexes (Tyrra et al., 2003) except a lot of reports on its nucleophilic properties (Fu et al., 2000). The DMAP complexes which exhibit luminescence properties was reported (Araki et al., 2005). In our systematic studies on transition metal complexes with the DMAP, the title compound was prepared and its x-ray structure is presented here.

The title compound has a paddlewheel type dimeric structure (Fig. 1) with an inversion centre located between the Zn ions. Each Zn atom is five-coordinate: the four equatorial O atoms belong to four bridging carboxyl groups and the N atom at the apical position is the pyridine N atom of the DMAP ligand. The Zn—O bond lengths are between 2.0390 Å and 2.0782 Å, but the Zn1—N1 distance is shorter [2.0134 (19) Å] (Table 1.). The Zn···Zn distance of 3.0037 (6) Å is longer than the corresponding distance of 2.9827 (7) Å in [Zn₂(C₆H₅COO)₄(H₂O)₂][Zn(C₆H₅COO)₂(1,2-bis(4-pyridyl)ethane)] (Han et al., 2009) and 2.9692 (15) Å in [Zn₂ (C₆H₅COO)₂(4,4'-bipyridine)]_n (Wang et al., 2008) and 2.9582 (4) Å in [Zn₂ (C₆H₅COO)₂(pyridine)₂] (Anirban et al., 2006), but shorter than the corresponding distance of 3.392 (5) Å in {Zn₃(C₆H₅COO)₆[(3-py)(CH) NOH]₂} (Konidaris et al., 2009).

Related literature top

For the nucleophilic properties of 4-(dimethylamino)pyridine (DMAP), see: Fu (2000). For complexes of (DMAP), see: Tyrra et al. (2003) and for those which exhibit luminescence, see: Araki et al. (2005). For Z···Z distances in related structures, see: Anirban et al. (2006); Han et al. (2009); Konidaris et al. (2009); Wang et al. (2008).

Experimental top

An ethanol solution (2 ml) containing DMAP (0.0611 g, 0.5 mmol) and Zn(CH₃COO)₂.2H₂O (0.0549 g, 0.25 mmol) was mixed with an aqueous solution (5 ml) of benzoic acid (0.0611 g, 0.5 mmol) and NaOH (0.0200 g, 0.5 mmol). The mixture was refluxed for 5 h. The solution was filtered after cooling to room temperature. Colorless single crystals suitable for x-ray diffraction were obtained from the filtrate after 6 days.

Computing details top

Data collection: SMART (Bruker, 2000); cell refinement: SAINT (Bruker, 2000); data reduction: SAINT (Bruker, 2000); 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 with displacement ellipsoids drawn at the 50% probability level. Symmetry code for atoms labeled with A : -x, -y, -z

Tetrakis(µ-benzoato-κ²O:O')bis{[4- (dimethylamino)pyridine-κN¹]zinc(II)} top

Crystal data top

[Zn₂(C₇H₅O₂)₄(C₇H₁₀N₂)₂]	F(000) = 888
M_r = 859.56	D_x = 1.439 Mg m⁻³
Monoclinic, P2₁/n	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2yn	Cell parameters from 3350 reflections
a = 10.3146 (12) Å	θ = 2.4–24.2°
b = 11.1558 (13) Å	µ = 1.27 mm⁻¹
c = 17.324 (2) Å	T = 296 K
β = 95.616 (1)°	Block, colorless
V = 1983.9 (4) Å³	0.30 × 0.30 × 0.20 mm
Z = 2

Data collection top

Bruker SMART CCD area-detector diffractometer	3515 independent reflections
Radiation source: fine-focus sealed tube	2860 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.030
ϕ and ω scans	θ_max = 25.1°, θ_min = 2.4°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −12→12
T_min = 0.702, T_max = 0.786	k = −9→13
10123 measured reflections	l = −20→20

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)] = 0.031	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.066	H-atom parameters constrained
S = 0.99	w = 1/[σ²(F_o²) + (0.0188P)² + 1.4303P] where P = (F_o² + 2F_c²)/3
3515 reflections	(Δ/σ)_max < 0.001
255 parameters	Δρ_max = 0.27 e Å⁻³
0 restraints	Δρ_min = −0.20 e Å⁻³

Crystal data top

[Zn₂(C₇H₅O₂)₄(C₇H₁₀N₂)₂]	V = 1983.9 (4) Å³
M_r = 859.56	Z = 2
Monoclinic, P2₁/n	Mo Kα radiation
a = 10.3146 (12) Å	µ = 1.27 mm⁻¹
b = 11.1558 (13) Å	T = 296 K
c = 17.324 (2) Å	0.30 × 0.30 × 0.20 mm
β = 95.616 (1)°

Data collection top

Bruker SMART CCD area-detector diffractometer	3515 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	2860 reflections with I > 2σ(I)
T_min = 0.702, T_max = 0.786	R_int = 0.030
10123 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.031	0 restraints
wR(F²) = 0.066	H-atom parameters constrained
S = 0.99	Δρ_max = 0.27 e Å⁻³
3515 reflections	Δρ_min = −0.20 e Å⁻³
255 parameters

Special details top

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > σ(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

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

	x	y	z	U_iso*/U_eq
Zn1	0.63121 (3)	−0.05006 (2)	0.028407 (16)	0.03192 (9)
C1	0.8975 (2)	−0.1390 (2)	0.00916 (15)	0.0405 (6)
H1	0.9011	−0.0714	−0.0220	0.049*
C2	1.0020 (2)	−0.2142 (2)	0.01489 (15)	0.0445 (7)
H2	1.0739	−0.1969	−0.0117	0.053*
C3	1.0015 (2)	−0.3180 (2)	0.06093 (15)	0.0412 (6)
C4	0.8891 (3)	−0.3349 (2)	0.09862 (16)	0.0504 (7)
H4	0.8824	−0.4014	0.1303	0.060*
C5	0.7892 (3)	−0.2544 (2)	0.08927 (16)	0.0478 (7)
H5	0.7159	−0.2691	0.1150	0.057*
C6	1.2169 (3)	−0.3787 (3)	0.0269 (2)	0.0689 (9)
H6A	1.1904	−0.3655	−0.0271	0.103*
H6B	1.2711	−0.4487	0.0326	0.103*
H6C	1.2649	−0.3104	0.0477	0.103*
C7	1.1030 (3)	−0.4980 (3)	0.1208 (2)	0.0769 (11)
H7A	1.0949	−0.4700	0.1725	0.115*
H7B	1.1833	−0.5412	0.1198	0.115*
H7C	1.0312	−0.5499	0.1047	0.115*
C8	0.5952 (2)	0.0937 (2)	−0.11840 (14)	0.0352 (6)
C9	0.6546 (2)	0.1572 (2)	−0.18291 (13)	0.0356 (6)
C10	0.7862 (3)	0.1480 (3)	−0.19036 (16)	0.0515 (7)
H10	0.8382	0.0994	−0.1564	0.062*
C11	0.8415 (3)	0.2103 (3)	−0.24778 (18)	0.0687 (9)
H11	0.9303	0.2033	−0.2524	0.082*
C12	0.7658 (4)	0.2825 (3)	−0.29808 (19)	0.0721 (10)
H12	0.8032	0.3253	−0.3363	0.086*
C13	0.6348 (4)	0.2911 (3)	−0.29167 (17)	0.0670 (9)
H13	0.5829	0.3389	−0.3262	0.080*
C14	0.5794 (3)	0.2289 (2)	−0.23407 (15)	0.0489 (7)
H14	0.4905	0.2357	−0.2299	0.059*
C15	0.5854 (3)	0.1832 (2)	0.08035 (14)	0.0388 (6)
C16	0.6088 (2)	0.2987 (2)	0.12389 (14)	0.0359 (6)
C17	0.7090 (3)	0.3097 (2)	0.18238 (16)	0.0513 (7)
H17	0.7658	0.2459	0.1933	0.062*
C18	0.7261 (3)	0.4143 (3)	0.22497 (17)	0.0609 (8)
H18	0.7924	0.4202	0.2652	0.073*
C19	0.6448 (3)	0.5083 (3)	0.2074 (2)	0.0686 (9)
H19	0.6551	0.5785	0.2362	0.082*
C20	0.5481 (3)	0.5007 (3)	0.1477 (2)	0.0739 (10)
H20	0.4950	0.5667	0.1351	0.089*
C21	0.5290 (3)	0.3959 (3)	0.10635 (18)	0.0550 (8)
H21	0.4621	0.3906	0.0664	0.066*
N1	0.78988 (18)	−0.15549 (18)	0.04532 (11)	0.0354 (5)
N2	1.1022 (2)	−0.3960 (2)	0.06836 (14)	0.0556 (6)
O1	0.67051 (17)	0.03548 (16)	−0.07120 (10)	0.0453 (5)
O2	0.47447 (17)	0.10480 (17)	−0.11606 (10)	0.0469 (5)
O3	0.67429 (19)	0.10512 (16)	0.08761 (11)	0.0518 (5)
O4	0.47960 (18)	0.17275 (17)	0.04000 (11)	0.0527 (5)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Zn1	0.02949 (15)	0.03168 (16)	0.03423 (16)	0.00493 (12)	0.00125 (11)	−0.00011 (13)
C1	0.0364 (14)	0.0381 (15)	0.0468 (15)	0.0033 (11)	0.0032 (12)	0.0100 (12)
C2	0.0336 (14)	0.0471 (16)	0.0540 (17)	0.0053 (12)	0.0112 (12)	0.0081 (14)
C3	0.0379 (15)	0.0423 (16)	0.0426 (15)	0.0095 (12)	0.0006 (12)	0.0009 (12)
C4	0.0529 (17)	0.0440 (17)	0.0560 (17)	0.0136 (14)	0.0140 (14)	0.0212 (14)
C5	0.0425 (16)	0.0479 (18)	0.0554 (17)	0.0078 (13)	0.0165 (13)	0.0117 (14)
C6	0.0460 (18)	0.070 (2)	0.092 (3)	0.0233 (16)	0.0155 (17)	−0.0007 (19)
C7	0.078 (2)	0.058 (2)	0.094 (3)	0.0313 (18)	0.003 (2)	0.021 (2)
C8	0.0403 (15)	0.0335 (14)	0.0323 (13)	−0.0005 (11)	0.0054 (12)	−0.0039 (11)
C9	0.0431 (15)	0.0335 (14)	0.0309 (13)	−0.0023 (11)	0.0071 (11)	−0.0032 (11)
C10	0.0463 (17)	0.065 (2)	0.0439 (16)	−0.0012 (14)	0.0082 (13)	0.0045 (14)
C11	0.059 (2)	0.091 (3)	0.060 (2)	−0.0180 (19)	0.0240 (17)	−0.0015 (19)
C12	0.099 (3)	0.068 (2)	0.054 (2)	−0.024 (2)	0.029 (2)	0.0061 (17)
C13	0.099 (3)	0.053 (2)	0.0504 (19)	0.0054 (19)	0.0109 (18)	0.0174 (15)
C14	0.0572 (18)	0.0435 (17)	0.0468 (16)	0.0054 (14)	0.0098 (14)	0.0045 (13)
C15	0.0478 (16)	0.0354 (15)	0.0343 (14)	−0.0030 (12)	0.0100 (13)	−0.0027 (11)
C16	0.0393 (14)	0.0309 (14)	0.0375 (14)	−0.0026 (11)	0.0047 (11)	−0.0037 (11)
C17	0.0591 (18)	0.0380 (16)	0.0534 (17)	0.0031 (13)	−0.0116 (14)	−0.0005 (13)
C18	0.072 (2)	0.050 (2)	0.0552 (19)	−0.0074 (16)	−0.0186 (16)	−0.0095 (15)
C19	0.078 (2)	0.0427 (19)	0.083 (2)	−0.0012 (17)	−0.005 (2)	−0.0268 (17)
C20	0.068 (2)	0.0414 (18)	0.108 (3)	0.0141 (16)	−0.015 (2)	−0.0204 (19)
C21	0.0503 (17)	0.0445 (18)	0.067 (2)	0.0064 (14)	−0.0091 (15)	−0.0137 (15)
N1	0.0320 (11)	0.0343 (12)	0.0397 (12)	0.0057 (9)	0.0031 (9)	0.0040 (9)
N2	0.0487 (14)	0.0509 (15)	0.0678 (16)	0.0235 (12)	0.0091 (12)	0.0100 (13)
O1	0.0433 (10)	0.0516 (12)	0.0418 (10)	0.0097 (9)	0.0076 (8)	0.0137 (9)
O2	0.0357 (10)	0.0635 (13)	0.0419 (10)	0.0024 (9)	0.0070 (8)	0.0109 (9)
O3	0.0574 (12)	0.0360 (11)	0.0605 (12)	0.0055 (9)	−0.0017 (10)	−0.0124 (9)
O4	0.0491 (12)	0.0513 (12)	0.0553 (12)	−0.0048 (9)	−0.0062 (10)	−0.0180 (9)

Geometric parameters (Å, º) top

Zn1—N1	2.0134 (19)	C9—C14	1.376 (3)
Zn1—O3	2.0390 (18)	C9—C10	1.380 (3)
Zn1—O1	2.0467 (16)	C10—C11	1.381 (4)
Zn1—O2ⁱ	2.0472 (17)	C10—H10	0.9300
Zn1—O4ⁱ	2.0782 (18)	C11—C12	1.373 (5)
Zn1—Zn1ⁱ	3.0037 (6)	C11—H11	0.9300
C1—N1	1.340 (3)	C12—C13	1.371 (5)
C1—C2	1.362 (3)	C12—H12	0.9300
C1—H1	0.9300	C13—C14	1.384 (4)
C2—C3	1.406 (4)	C13—H13	0.9300
C2—H2	0.9300	C14—H14	0.9300
C3—N2	1.351 (3)	C15—O4	1.243 (3)
C3—C4	1.398 (4)	C15—O3	1.262 (3)
C4—C5	1.364 (3)	C15—C16	1.500 (3)
C4—H4	0.9300	C16—C17	1.380 (3)
C5—N1	1.341 (3)	C16—C21	1.377 (4)
C5—H5	0.9300	C17—C18	1.382 (4)
C6—N2	1.456 (4)	C17—H17	0.9300
C6—H6A	0.9600	C18—C19	1.358 (4)
C6—H6B	0.9600	C18—H18	0.9300
C6—H6C	0.9600	C19—C20	1.367 (4)
C7—N2	1.456 (4)	C19—H19	0.9300
C7—H7A	0.9600	C20—C21	1.376 (4)
C7—H7B	0.9600	C20—H20	0.9300
C7—H7C	0.9600	C21—H21	0.9300
C8—O1	1.253 (3)	O2—Zn1ⁱ	2.0471 (17)
C8—O2	1.256 (3)	O4—Zn1ⁱ	2.0782 (18)
C8—C9	1.503 (3)

N1—Zn1—O3	106.79 (8)	C10—C9—C8	120.7 (2)
N1—Zn1—O1	99.78 (7)	C9—C10—C11	120.6 (3)
O3—Zn1—O1	88.67 (8)	C9—C10—H10	119.7
N1—Zn1—O2ⁱ	101.66 (8)	C11—C10—H10	119.7
O3—Zn1—O2ⁱ	89.18 (8)	C12—C11—C10	120.2 (3)
O1—Zn1—O2ⁱ	158.15 (7)	C12—C11—H11	119.9
N1—Zn1—O4ⁱ	95.29 (8)	C10—C11—H11	119.9
O3—Zn1—O4ⁱ	157.92 (8)	C13—C12—C11	119.6 (3)
O1—Zn1—O4ⁱ	88.25 (8)	C13—C12—H12	120.2
O2ⁱ—Zn1—O4ⁱ	85.61 (8)	C11—C12—H12	120.2
N1—Zn1—Zn1ⁱ	163.45 (6)	C12—C13—C14	120.2 (3)
O3—Zn1—Zn1ⁱ	89.66 (5)	C12—C13—H13	119.9
O1—Zn1—Zn1ⁱ	78.28 (5)	C14—C13—H13	119.9
O2ⁱ—Zn1—Zn1ⁱ	79.97 (5)	C9—C14—C13	120.7 (3)
O4ⁱ—Zn1—Zn1ⁱ	68.30 (5)	C9—C14—H14	119.7
N1—C1—C2	124.6 (2)	C13—C14—H14	119.7
N1—C1—H1	117.7	O4—C15—O3	125.5 (2)
C2—C1—H1	117.7	O4—C15—C16	116.9 (2)
C1—C2—C3	120.1 (2)	O3—C15—C16	117.6 (2)
C1—C2—H2	119.9	C17—C16—C21	118.7 (2)
C3—C2—H2	119.9	C17—C16—C15	121.2 (2)
N2—C3—C4	122.2 (2)	C21—C16—C15	120.1 (2)
N2—C3—C2	122.6 (2)	C16—C17—C18	121.0 (3)
C4—C3—C2	115.2 (2)	C16—C17—H17	119.5
C5—C4—C3	120.5 (2)	C18—C17—H17	119.5
C5—C4—H4	119.8	C19—C18—C17	119.2 (3)
C3—C4—H4	119.8	C19—C18—H18	120.4
N1—C5—C4	124.3 (2)	C17—C18—H18	120.4
N1—C5—H5	117.9	C18—C19—C20	120.7 (3)
C4—C5—H5	117.9	C18—C19—H19	119.6
N2—C6—H6A	109.5	C20—C19—H19	119.6
N2—C6—H6B	109.5	C19—C20—C21	120.2 (3)
H6A—C6—H6B	109.5	C19—C20—H20	119.9
N2—C6—H6C	109.5	C21—C20—H20	119.9
H6A—C6—H6C	109.5	C20—C21—C16	120.2 (3)
H6B—C6—H6C	109.5	C20—C21—H21	119.9
N2—C7—H7A	109.5	C16—C21—H21	119.9
N2—C7—H7B	109.5	C1—N1—C5	115.4 (2)
H7A—C7—H7B	109.5	C1—N1—Zn1	123.41 (16)
N2—C7—H7C	109.5	C5—N1—Zn1	120.93 (16)
H7A—C7—H7C	109.5	C3—N2—C6	121.4 (2)
H7B—C7—H7C	109.5	C3—N2—C7	121.3 (2)
O1—C8—O2	125.7 (2)	C6—N2—C7	117.2 (2)
O1—C8—C9	117.2 (2)	C8—O1—Zn1	129.10 (16)
O2—C8—C9	117.1 (2)	C8—O2—Zn1ⁱ	126.60 (16)
C14—C9—C10	118.7 (2)	C15—O3—Zn1	114.55 (17)
C14—C9—C8	120.5 (2)	C15—O4—Zn1ⁱ	141.85 (18)

Symmetry code: (i) −x+1, −y, −z.

Experimental details

Crystal data
Chemical formula	[Zn₂(C₇H₅O₂)₄(C₇H₁₀N₂)₂]
M_r	859.56
Crystal system, space group	Monoclinic, P2₁/n
Temperature (K)	296
a, b, c (Å)	10.3146 (12), 11.1558 (13), 17.324 (2)
β (°)	95.616 (1)
V (Å³)	1983.9 (4)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	1.27
Crystal size (mm)	0.30 × 0.30 × 0.20

Data collection
Diffractometer	Bruker SMART CCD area-detector diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.702, 0.786
No. of measured, independent and observed [I > 2σ(I)] reflections	10123, 3515, 2860
R_int	0.030
(sin θ/λ)_max (Å⁻¹)	0.596

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.031, 0.066, 0.99
No. of reflections	3515
No. of parameters	255
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.27, −0.20

Computer programs: SMART (Bruker, 2000), SAINT (Bruker, 2000), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Selected bond lengths (Å) top

Zn1—N1	2.0134 (19)	Zn1—O2ⁱ	2.0472 (17)
Zn1—O3	2.0390 (18)	Zn1—O4ⁱ	2.0782 (18)
Zn1—O1	2.0467 (16)	Zn1—Zn1ⁱ	3.0037 (6)

Symmetry code: (i) −x+1, −y, −z.

Acknowledgements

We thank Min Shao of Shanghai University for working on the crystal structure analysis.

References

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