catena-Poly[[[dibromidocadmium]-μ2-1,1′-(butane-1,4-di­yl)bis­(pyridinium-4-carboxyl­ate)] monohydrate]

Guo, F.; Li, Y.; Yang, S.; Chen, R.

doi:10.1107/S160053681101662X

metal-organic compounds

CRYSTALLOGRAPHIC
COMMUNICATIONS

ISSN: 2056-9890

Volume 67| Part 6| June 2011| Page m729

doi:10.1107/S160053681101662X

Open

access

catena-Poly[[[dibromidocadmium]-μ₂-1,1′-(butane-1,4-diyl)bis(pyridinium-4-carboxylate)] monohydrate]

Feijun Guo,^a Yuan Li,^b Simin Yang ^b and Ruizhan Chen ^b ^*

^aThe Institute of Higher Education, Changchun Normal University, Changchun 130032, People's Republic of China, and ^bCollege of Chemistry, Changchun Normal University, Changchun 130032, People's Republic of China
^*Correspondence e-mail: rzchen2011@yahoo.cn

(Received 26 April 2011; accepted 3 May 2011; online 7 May 2011)

In the title compound, {[CdBr₂(C₁₆H₁₆N₂O₄)]·H₂O}_n, the Cd^II ion is six-coordinated by a Br₂O₄ donor set, with four O atoms from two bridging 1,1′-(butane-1,4-diyl)bis(pyridinium-4-carboxylate) ligands. The ligands link the Cd^II ions into a zigzag chain extending along [0 $[\overline{1}]$ 1]. O—H⋯O and O—H⋯Br hydrogen bonds involving the uncoordinated water molecules connect the chains.

Related literature

For the design and synthesis of coordination polymers, see: Li et al. (2005 ). For a related structure, see: Ma et al. (2000 ).

Experimental

Crystal data

[CdBr₂(C₁₆H₁₆N₂O₄)]·H₂O
M_r = 590.53
Triclinic, $[P \overline 1]$
a = 7.6529 (5) Å
b = 9.3969 (6) Å
c = 14.0198 (9) Å
α = 74.410 (1)°
β = 87.060 (2)°
γ = 71.581 (1)°
V = 920.75 (10) Å³
Z = 2
Mo Kα radiation
μ = 5.56 mm⁻¹
T = 296 K
0.20 × 0.17 × 0.16 mm

Data collection

Bruker APEX CCD diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.34, T_max = 0.41
5114 measured reflections
3600 independent reflections
3238 reflections with I > 2σ(I)
R_int = 0.013

Refinement

R[F² > 2σ(F²)] = 0.042
wR(F²) = 0.118
S = 1.08
3600 reflections
241 parameters
4 restraints
H atoms treated by a mixture of independent and constrained refinement
Δρ_max = 1.45 e Å⁻³
Δρ_min = −2.11 e Å⁻³

Table 1
Selected bond lengths (Å)

Cd1—O1	2.476 (4)
Cd1—O2	2.345 (4)
Cd1—O3ⁱ	2.409 (4)
Cd1—O4ⁱ	2.435 (4)
Cd1—Br1	2.5728 (8)
Cd1—Br2	2.6162 (8)
Symmetry code: (i) x, y+1, z-1.

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1W—H1A⋯O2ⁱⁱ	0.84 (7)	2.10 (7)	2.934 (6)	174 (5)
O1W—H1B⋯Br2ⁱⁱⁱ	0.83 (5)	2.65 (6)	3.467 (4)	169 (6)
Symmetry codes: (ii) x, y-1, z; (iii) -x+1, -y+1, -z+1.

Data collection: SMART (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) and DIAMOND (Brandenburg, 1999 ); software used to prepare material for publication: SHELXTL.

Supporting information

Crystal structure: contains datablocks global, I. DOI: 10.1107/S160053681101662X/hy2426sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S160053681101662X/hy2426Isup2.hkl

checkCIF report

Comment top

The design and synthesis of coordination polymers are of great interest for their intriguing architectures and potential applications (Li et al., 2005). In this paper, the structure of the title compound is described.

As shown in Fig. 1, the Cd^II ion is six-coordinated by two Br^- anions and four O atoms from two butane-1,4-diylbis(pyridinium-1-yl-4-carboxylate (L) ligands (Table 1). The two carboxylate groups of the L ligand display a bidentate chelating mode. The bond distances and angles are normal (Ma et al., 2000). As illustrated in Fig. 2, each L ligand bridges two Cd^II ions, resulting in a one-dimensional zigzag chain, with a Cd···Cd separation of 14.630 (1) Å. O—H···O and O—H···Br hydrogen bonds (Table 2) involving the uncoordinated water molecules connect the chains.

Related literature top

For the design and synthesis of coordination polymers, see: Li et al. (2005). For a related structure, see: Ma et al. (2000).

Experimental top

The ligand L was synthesized according to literature (Li et al., 2005). A mixture of Cd(NO₃)₂.4H₂O (0.015 g), L (0.023 g), NaOH (0.004 g) and water (10 ml) was heated at 80°C for 25 min. After the mixture had been cooled to room temperature, colorless crystals of the title compound were obtained (yield: 43%).

Computing details top

Data collection: SMART (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) and DIAMOND (Brandenburg, 1999); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top

	Fig. 1. The asymmetric unit of the title compound. Displacement ellipsoids are drawn at the 30% probability level. H atoms have been omitted for clarity. [Symmetry code: (i) x, 1+y, -1+z.]
	Fig. 2. View of the zigzag chain.

catena-Poly[[[dibromidocadmium]-µ-1,1'-(butane-1,4- diyl)bis(pyridinium-4-carboxylate)] monohydrate] top

Crystal data top

[CdBr₂(C₁₆H₁₆N₂O₄)]·H₂O	Z = 2
M_r = 590.53	F(000) = 572
Triclinic, P1	D_x = 2.130 Mg m⁻³
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 7.6529 (5) Å	Cell parameters from 3238 reflections
b = 9.3969 (6) Å	θ = 1.5–26.2°
c = 14.0198 (9) Å	µ = 5.56 mm⁻¹
α = 74.410 (1)°	T = 296 K
β = 87.060 (2)°	Block, colorless
γ = 71.581 (1)°	0.20 × 0.17 × 0.16 mm
V = 920.75 (10) Å³

Data collection top

Bruker APEX CCD diffractometer	3600 independent reflections
Radiation source: fine-focus sealed tube	3238 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.013
ϕ and ω scans	θ_max = 26.2°, θ_min = 1.5°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −9→9
T_min = 0.34, T_max = 0.41	k = −7→11
5114 measured reflections	l = −17→17

Refinement top

Refinement on F²	Primary atom site location: patterson
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.042	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.118	H atoms treated by a mixture of independent and constrained refinement
S = 1.08	w = 1/[σ²(F_o²) + (0.0524P)² + 9.2463P] where P = (F_o² + 2F_c²)/3
3600 reflections	(Δ/σ)_max = 0.001
241 parameters	Δρ_max = 1.45 e Å⁻³
4 restraints	Δρ_min = −2.11 e Å⁻³

Crystal data top

[CdBr₂(C₁₆H₁₆N₂O₄)]·H₂O	γ = 71.581 (1)°
M_r = 590.53	V = 920.75 (10) Å³
Triclinic, P1	Z = 2
a = 7.6529 (5) Å	Mo Kα radiation
b = 9.3969 (6) Å	µ = 5.56 mm⁻¹
c = 14.0198 (9) Å	T = 296 K
α = 74.410 (1)°	0.20 × 0.17 × 0.16 mm
β = 87.060 (2)°

Data collection top

Bruker APEX CCD diffractometer	3600 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	3238 reflections with I > 2σ(I)
T_min = 0.34, T_max = 0.41	R_int = 0.013
5114 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.042	4 restraints
wR(F²) = 0.118	H atoms treated by a mixture of independent and constrained refinement
S = 1.08	Δρ_max = 1.45 e Å⁻³
3600 reflections	Δρ_min = −2.11 e Å⁻³
241 parameters

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

	x	y	z	U_iso*/U_eq
Cd1	0.47375 (5)	1.16457 (5)	0.24196 (3)	0.01263 (13)
C1	0.7499 (8)	0.9542 (7)	0.3709 (4)	0.0134 (11)
C2	1.1656 (8)	0.6169 (7)	0.4914 (4)	0.0131 (11)
H4	1.2521	0.5317	0.4764	0.016*
C3	1.0287 (8)	0.7160 (7)	0.4228 (4)	0.0149 (11)
H3	1.0244	0.6995	0.3606	0.018*
C4	0.8966 (8)	0.8412 (7)	0.4467 (4)	0.0130 (11)
C5	0.9054 (8)	0.8616 (7)	0.5403 (4)	0.0142 (11)
H6	0.8164	0.9424	0.5585	0.017*
C6	1.0467 (8)	0.7616 (6)	0.6065 (4)	0.0129 (11)
H5	1.0537	0.7760	0.6691	0.015*
C7	1.3272 (8)	0.5417 (7)	0.6535 (4)	0.0136 (11)
H7A	1.3690	0.6045	0.6861	0.016*
H7B	1.4298	0.4894	0.6187	0.016*
C8	1.2649 (8)	0.4214 (7)	0.7305 (4)	0.0144 (11)
H8A	1.2521	0.3430	0.7008	0.017*
H8B	1.1457	0.4711	0.7539	0.017*
C9	1.4043 (8)	0.3444 (7)	0.8174 (4)	0.0135 (11)
H9A	1.5276	0.3192	0.7923	0.016*
H9B	1.3945	0.4173	0.8565	0.016*
C10	1.3755 (8)	0.1972 (7)	0.8834 (4)	0.0135 (11)
H10A	1.3859	0.1243	0.8442	0.016*
H10B	1.4723	0.1495	0.9349	0.016*
C11	1.1690 (8)	0.2881 (7)	1.0082 (4)	0.0157 (12)
H11	1.2593	0.3246	1.0254	0.019*
C12	1.0140 (8)	0.2988 (7)	1.0617 (4)	0.0154 (11)
H12	0.9988	0.3416	1.1153	0.019*
C13	0.8779 (8)	0.2448 (6)	1.0353 (4)	0.0127 (11)
C14	0.9010 (8)	0.1903 (7)	0.9516 (4)	0.0138 (11)
H14	0.8086	0.1604	0.9299	0.017*
C15	1.0608 (8)	0.1803 (7)	0.9003 (4)	0.0144 (11)
H15	1.0771	0.1422	0.8446	0.017*
C16	0.7200 (8)	0.2339 (7)	1.1034 (4)	0.0146 (11)
N1	1.1736 (7)	0.6442 (6)	0.5809 (3)	0.0123 (9)
N2	1.1936 (6)	0.2255 (5)	0.9307 (3)	0.0103 (9)
O1	0.7496 (6)	0.9313 (5)	0.2877 (3)	0.0158 (8)
O2	0.6345 (6)	1.0670 (5)	0.3958 (3)	0.0169 (9)
O3	0.6036 (6)	0.1791 (5)	1.0807 (3)	0.0171 (9)
O4	0.7215 (6)	0.2727 (5)	1.1822 (3)	0.0181 (9)
Br1	0.24542 (9)	1.43346 (8)	0.24021 (6)	0.0306 (2)
Br2	0.26563 (10)	0.98804 (8)	0.25061 (5)	0.02913 (19)
O1W	0.4919 (7)	0.2586 (5)	0.5341 (3)	0.0234 (10)
H1A	0.529 (11)	0.199 (8)	0.497 (5)	0.035*
H1B	0.539 (11)	0.207 (9)	0.590 (3)	0.035*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Cd1	0.0110 (2)	0.0143 (2)	0.0108 (2)	−0.00276 (16)	0.00083 (14)	−0.00187 (15)
C1	0.015 (3)	0.014 (3)	0.013 (3)	−0.008 (2)	0.001 (2)	−0.002 (2)
C2	0.015 (3)	0.014 (3)	0.012 (3)	−0.006 (2)	0.001 (2)	−0.004 (2)
C3	0.019 (3)	0.016 (3)	0.011 (3)	−0.007 (2)	0.001 (2)	−0.005 (2)
C4	0.013 (3)	0.014 (3)	0.014 (3)	−0.007 (2)	0.001 (2)	−0.003 (2)
C5	0.015 (3)	0.014 (3)	0.014 (3)	−0.004 (2)	0.004 (2)	−0.005 (2)
C6	0.017 (3)	0.011 (3)	0.010 (3)	−0.004 (2)	0.003 (2)	−0.003 (2)
C7	0.012 (3)	0.017 (3)	0.011 (3)	−0.005 (2)	−0.002 (2)	0.000 (2)
C8	0.011 (3)	0.014 (3)	0.016 (3)	−0.006 (2)	−0.001 (2)	0.001 (2)
C9	0.013 (3)	0.015 (3)	0.011 (3)	−0.005 (2)	0.001 (2)	0.000 (2)
C10	0.011 (3)	0.015 (3)	0.012 (3)	−0.002 (2)	0.003 (2)	−0.003 (2)
C11	0.016 (3)	0.020 (3)	0.013 (3)	−0.009 (2)	0.000 (2)	−0.004 (2)
C12	0.017 (3)	0.017 (3)	0.013 (3)	−0.004 (2)	0.001 (2)	−0.005 (2)
C13	0.014 (3)	0.009 (3)	0.012 (3)	−0.002 (2)	0.000 (2)	−0.001 (2)
C14	0.016 (3)	0.013 (3)	0.011 (3)	−0.005 (2)	−0.003 (2)	−0.001 (2)
C15	0.015 (3)	0.014 (3)	0.014 (3)	−0.005 (2)	0.000 (2)	−0.003 (2)
C16	0.015 (3)	0.012 (3)	0.014 (3)	−0.002 (2)	0.001 (2)	−0.002 (2)
N1	0.015 (2)	0.012 (2)	0.010 (2)	−0.0066 (19)	0.0010 (18)	−0.0004 (18)
N2	0.012 (2)	0.010 (2)	0.008 (2)	−0.0035 (18)	0.0005 (17)	0.0000 (17)
O1	0.017 (2)	0.017 (2)	0.012 (2)	−0.0024 (17)	−0.0020 (16)	−0.0040 (16)
O2	0.020 (2)	0.017 (2)	0.012 (2)	−0.0018 (17)	−0.0011 (16)	−0.0040 (16)
O3	0.014 (2)	0.026 (2)	0.012 (2)	−0.0086 (18)	0.0017 (15)	−0.0031 (17)
O4	0.017 (2)	0.025 (2)	0.015 (2)	−0.0080 (18)	0.0052 (16)	−0.0081 (18)
Br1	0.0196 (3)	0.0228 (4)	0.0477 (5)	−0.0041 (3)	0.0005 (3)	−0.0095 (3)
Br2	0.0287 (4)	0.0294 (4)	0.0303 (4)	−0.0093 (3)	0.0054 (3)	−0.0102 (3)
O1W	0.030 (3)	0.018 (2)	0.020 (2)	−0.005 (2)	0.0032 (19)	−0.0052 (18)

Geometric parameters (Å, º) top

Cd1—O1	2.476 (4)	C8—H8A	0.9700
Cd1—O2	2.345 (4)	C8—H8B	0.9700
Cd1—O3ⁱ	2.409 (4)	C9—C10	1.518 (8)
Cd1—O4ⁱ	2.435 (4)	C9—H9A	0.9700
Cd1—Br1	2.5728 (8)	C9—H9B	0.9700
Cd1—Br2	2.6162 (8)	C10—N2	1.487 (7)
C1—O1	1.241 (7)	C10—H10A	0.9700
C1—O2	1.266 (7)	C10—H10B	0.9700
C1—C4	1.510 (8)	C11—N2	1.347 (7)
C2—N1	1.354 (7)	C11—C12	1.361 (8)
C2—C3	1.377 (8)	C11—H11	0.9300
C2—H4	0.9300	C12—C13	1.398 (8)
C3—C4	1.394 (8)	C12—H12	0.9300
C3—H3	0.9300	C13—C14	1.385 (8)
C4—C5	1.383 (8)	C13—C16	1.513 (8)
C5—C6	1.380 (8)	C14—C15	1.376 (8)
C5—H6	0.9300	C14—H14	0.9300
C6—N1	1.338 (7)	C15—N2	1.345 (7)
C6—H5	0.9300	C15—H15	0.9300
C7—N1	1.491 (7)	C16—O3	1.252 (7)
C7—C8	1.517 (8)	C16—O4	1.254 (7)
C7—H7A	0.9700	O1W—H1A	0.84 (7)
C7—H7B	0.9700	O1W—H1B	0.83 (5)
C8—C9	1.522 (8)

O2—Cd1—O3ⁱ	127.10 (14)	C8—C7—H7B	109.5
O2—Cd1—O4ⁱ	86.07 (15)	H7A—C7—H7B	108.1
O3ⁱ—Cd1—O4ⁱ	54.49 (14)	C7—C8—C9	110.3 (5)
O2—Cd1—O1	54.51 (14)	C7—C8—H8A	109.6
O3ⁱ—Cd1—O1	81.38 (14)	C9—C8—H8A	109.6
O4ⁱ—Cd1—O1	78.10 (14)	C7—C8—H8B	109.6
O2—Cd1—Br1	106.91 (10)	C9—C8—H8B	109.6
O3ⁱ—Cd1—Br1	108.36 (11)	H8A—C8—H8B	108.1
O4ⁱ—Cd1—Br1	92.51 (10)	C10—C9—C8	112.4 (5)
O1—Cd1—Br1	159.25 (10)	C10—C9—H9A	109.1
O2—Cd1—Br2	104.34 (11)	C8—C9—H9A	109.1
O3ⁱ—Cd1—Br2	103.49 (10)	C10—C9—H9B	109.1
O4ⁱ—Cd1—Br2	156.16 (10)	C8—C9—H9B	109.1
O1—Cd1—Br2	90.43 (10)	H9A—C9—H9B	107.8
Br1—Cd1—Br2	104.48 (3)	N2—C10—C9	113.1 (5)
O2—Cd1—C16ⁱ	106.48 (16)	N2—C10—H10A	108.9
O3ⁱ—Cd1—C16ⁱ	27.25 (16)	C9—C10—H10A	108.9
O4ⁱ—Cd1—C16ⁱ	27.32 (16)	N2—C10—H10B	108.9
O1—Cd1—C16ⁱ	76.82 (15)	C9—C10—H10B	108.9
Br1—Cd1—C16ⁱ	103.21 (12)	H10A—C10—H10B	107.8
Br2—Cd1—C16ⁱ	129.79 (12)	N2—C11—C12	121.1 (5)
O2—Cd1—C1	27.52 (16)	N2—C11—H11	119.5
O3ⁱ—Cd1—C1	104.69 (16)	C12—C11—H11	119.5
O4ⁱ—Cd1—C1	81.35 (16)	C11—C12—C13	119.4 (5)
O1—Cd1—C1	26.99 (15)	C11—C12—H12	120.3
Br1—Cd1—C1	133.92 (12)	C13—C12—H12	120.3
Br2—Cd1—C1	97.91 (12)	C14—C13—C12	118.4 (5)
C16ⁱ—Cd1—C1	91.88 (17)	C14—C13—C16	122.0 (5)
O1—C1—O2	123.8 (5)	C12—C13—C16	119.3 (5)
O1—C1—C4	118.2 (5)	C15—C14—C13	120.0 (5)
O2—C1—C4	118.0 (5)	C15—C14—H14	120.0
O1—C1—Cd1	64.9 (3)	C13—C14—H14	120.0
O2—C1—Cd1	58.9 (3)	N2—C15—C14	120.1 (5)
C4—C1—Cd1	176.8 (4)	N2—C15—H15	120.0
N1—C2—C3	119.7 (5)	C14—C15—H15	120.0
N1—C2—H4	120.2	O3—C16—O4	124.4 (6)
C3—C2—H4	120.2	O3—C16—C13	118.5 (5)
C2—C3—C4	119.9 (5)	O4—C16—C13	116.9 (5)
C2—C3—H3	120.1	O3—C16—Cd1ⁱⁱ	61.8 (3)
C4—C3—H3	120.1	O4—C16—Cd1ⁱⁱ	63.0 (3)
C5—C4—C3	118.7 (5)	C13—C16—Cd1ⁱⁱ	170.2 (4)
C5—C4—C1	120.9 (5)	C6—N1—C2	121.7 (5)
C3—C4—C1	120.4 (5)	C6—N1—C7	118.6 (5)
C6—C5—C4	119.7 (5)	C2—N1—C7	119.8 (5)
C6—C5—H6	120.1	C15—N2—C11	120.8 (5)
C4—C5—H6	120.1	C15—N2—C10	120.3 (5)
N1—C6—C5	120.3 (5)	C11—N2—C10	118.7 (5)
N1—C6—H5	119.9	C1—O1—Cd1	88.1 (3)
C5—C6—H5	119.9	C1—O2—Cd1	93.6 (3)
N1—C7—C8	110.8 (4)	C16—O3—Cd1ⁱⁱ	90.9 (3)
N1—C7—H7A	109.5	C16—O4—Cd1ⁱⁱ	89.7 (4)
C8—C7—H7A	109.5	H1A—O1W—H1B	105 (8)
N1—C7—H7B	109.5

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1W—H1A···O2ⁱⁱⁱ	0.84 (7)	2.10 (7)	2.934 (6)	174 (5)
O1W—H1B···Br2^iv	0.83 (5)	2.65 (6)	3.467 (4)	169 (6)

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

Experimental details

Crystal data
Chemical formula	[CdBr₂(C₁₆H₁₆N₂O₄)]·H₂O
M_r	590.53
Crystal system, space group	Triclinic, P1
Temperature (K)	296
a, b, c (Å)	7.6529 (5), 9.3969 (6), 14.0198 (9)
α, β, γ (°)	74.410 (1), 87.060 (2), 71.581 (1)
V (Å³)	920.75 (10)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	5.56
Crystal size (mm)	0.20 × 0.17 × 0.16

Data collection
Diffractometer	Bruker APEX CCD diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.34, 0.41
No. of measured, independent and observed [I > 2σ(I)] reflections	5114, 3600, 3238
R_int	0.013
(sin θ/λ)_max (Å⁻¹)	0.620

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.042, 0.118, 1.08
No. of reflections	3600
No. of parameters	241
No. of restraints	4
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	1.45, −2.11

Computer programs: SMART (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 1999), SHELXTL (Sheldrick, 2008).

Selected bond lengths (Å) top

Cd1—O1	2.476 (4)	Cd1—O4ⁱ	2.435 (4)
Cd1—O2	2.345 (4)	Cd1—Br1	2.5728 (8)
Cd1—O3ⁱ	2.409 (4)	Cd1—Br2	2.6162 (8)

Symmetry code: (i) x, y+1, z−1.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1W—H1A···O2ⁱⁱ	0.84 (7)	2.10 (7)	2.934 (6)	174 (5)
O1W—H1B···Br2ⁱⁱⁱ	0.83 (5)	2.65 (6)	3.467 (4)	169 (6)

Symmetry codes: (ii) x, y−1, z; (iii) −x+1, −y+1, −z+1.

Acknowledgements

We thank Changchun Normal University for support.

References

Brandenburg, K. (1999). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Bruker (2007). SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Li, S.-L., Ji, W.-Z., Hou, J.-F. & Tian, D.-K. (2005). Chin. J. Inorg. Chem. 1, 30–34. Google Scholar
Ma, J.-F., Liu, J.-F., Xing, Y., Jia, H.-Q. & Lin, Y.-H. (2000). J. Chem. Soc. Dalton Trans. pp. 2403–2407. Web of Science CSD CrossRef 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

This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.