Poly[bis­[μ2-2-(2-pyridylmethyl­amino)ethanesulfonato]cadmium(II)]

Du, Z.-X.; Chang, X.-H.

doi:10.1107/S1600536809049162

metal-organic compounds

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Volume 65| Part 12| December 2009| Page m1655

doi:10.1107/S1600536809049162

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Poly[bis[μ₂-2-(2-pyridylmethylamino)ethanesulfonato]cadmium(II)]

Zhong-Xiang Du ^a ^* and Xin-Hong Chang ^a

^aDepartment of Chemistry, Luoyang Normal University, Luoyang, Henan 471022, People's Republic of China
^*Correspondence e-mail: dzx6281@126.com

(Received 5 November 2009; accepted 18 November 2009; online 21 November 2009)

The title compound [Cd(C₈H₁₁N₂O₃S)₂]_n, is a two-dimensional coordination polymer based on a Cd²⁺ atom and deprotonated 2-(2-pyridylmethylamino)ethanesulfonic acid (Hpmt). The complex has molecular symmetry C_i as a consequence of the Cd^II being located on an inversion centre. Two N atoms of each pmt⁻ ligand coordinate to the Cd²⁺ ion and its sulfonate O atom bonds to an adjacent Cd²⁺ ion. 24-membered (–Cd—N—C—C—S—O–)₄ rings are formed between neighbouring Cd²⁺ ions; these are interconnected, forming a two-dimensional layer structure. In respect to stereogenic amino N atom and the inversion symmetry of the complex, the compound is a 1:1 racemate. The crystal packing is stabilized by intermolecular N—H⋯O hydrogen bonds and further connected by π–π stacking interactions between the pyridyl rings [average interplanar distance and centroid–centroid separation = 3.582 (1) and 3.634 (1)Å, respectively], forming a three-dimensional supramolecular architecture.

Related literature

For different coordination modes of the pmt⁻ ligand in complexes derived from Hpmt, see: Du & Zhang (2009 ); Li et al. (2006 , 2007a ,b , 2008a ,b ); Liao et al. (2007 ).

Experimental

Crystal data

[Cd(C₈H₁₁N₂O₃S)₂]
M_r = 542.90
Monoclinic, P 2₁ /c
a = 8.8982 (8) Å
b = 14.0206 (12) Å
c = 7.9040 (7) Å
β = 103.579 (1)°
V = 958.52 (15) Å³
Z = 2
Mo Kα radiation
μ = 1.40 mm⁻¹
T = 291 K
0.22 × 0.16 × 0.12 mm

Data collection

Bruker APEXII CCD area-detector diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.749, T_max = 0.849
5691 measured reflections
2178 independent reflections
2008 reflections with I > 2σ(I)
R_int = 0.011

Refinement

R[F² > 2σ(F²)] = 0.019
wR(F²) = 0.049
S = 1.03
2178 reflections
133 parameters
H-atom parameters constrained
Δρ_max = 0.48 e Å⁻³
Δρ_min = −0.38 e Å⁻³

Table 1
Selected bond lengths (Å)

Cd1—N1	2.2853 (14)
Cd1—O2ⁱ	2.3496 (14)
Cd1—N2	2.3979 (15)
Symmetry code: (i) $[-x+1, y-{\script{1\over 2}}, -z+{\script{1\over 2}}]$ .

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2⋯O3ⁱⁱ	0.91	2.26	3.089 (2)	152
Symmetry code: (ii) $[x, -y+{\script{1\over 2}}, z+{\script{1\over 2}}]$ .

Data collection: APEX2 (Bruker, 2004 ); cell refinement: SAINT (Bruker, 2004); 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/S1600536809049162/kp2239sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536809049162/kp2239Isup2.hkl

checkCIF report

Comment top

In the previous literatures, several complexes derived from Hpmt have been reported. Among them, pmt^- ligand displays different coordination modes, such as tridentate chelate (Du & Zhang, 2009; Li et al., 2006, 2008a; Liao et al., 2007), µ₂ bridge(Li et al., 2007a, 2008b) and µ₃ bridge (Li et al., 2007b). In this paper, we describe another new complex of pmt^-, (I), Figure 1.

Compound 1 is a two-dimensional coordination polymer and the repeating unit comprises one Cd²⁺ ion and two pmt^- ligands(Fig. 1, Table 1). Cd²⁺ ion situates on a centre of symmetry and is six-coordinated with four N atoms from two pmt^- ligands along with two sulfonate O atoms belonging to another two ligands, showing a distorted octahedral geometry (Table 1). The four N atoms from two pmt^- ligands define the equatorial plane with the Cd centre located in the plane, and two O atoms are at the axial positions with O2A—Cd1—O2B angle of just 180°[Symmetry codes: (A)1 - x, -1/2 + y, 0.5 - z; (B)x, 0.5 - y, -1/2 + z]. Each pmt^- plays as a µ₂ bridge to connect two Cd²⁺ ions and each Cd²⁺ ion links four pmt^- ligands, forming an infinite two-dimensional layer structure with (4, 4) topology (Figure 2). The network is based on (Cd(pmt))₄ rhombus, a 24-membered metal-ligand ring (–Cd—N—C—C—S—O–)₄ formed by four pmt^- and four quadruply connected Cd²⁺ ions. The edge Cd···Cd distance of the rhombus is 8.048 (3)Å and the Cd···Cd separations through the diagonal of the rhombus are 7.904 (2)Å and 14.021 (1) Å, respectively (Figure 2).

The two-dimensional layer is stabilized by intermolecular N—H···O hydrogen bonds (Figure 3 & Table 2). The interlayers are further connected by π-π stacking interactions of parallel pyridine rings of adjacent layers. The interplanar average distance and ringcentroid separation distance are 3.582 (1)Å and 3.634 (1) Å, respectively. Thus, the three-dimensional supramolecular architecture of (I) is formed (Figure 4).

Related literature top

For different coordination modes of the pmt^- ligand in complexes derived from Hpmt, see: Du & Zhang (2009); Li et al. (2006, 2007a,b, 2008a,b); Liao et al. (2007).

Experimental top

The ligand Hpmt was prepared according to the method of Li et al., 2006. A water solution (5 ml) of ligand Hpmt (2 mmol, 0.432 g) was added dropwise to a solution of CdCl₂. 2.5H₂O (0.228 g, 1.0 mmol) in methanol (8 ml), then the obtained mixture was stirred at 333 K for 3 h. After that, the mixture was basified with KOH (1 mol/l) to a pH of 7.5–8.0 and continued stirring for another 4 h, filtrated. Two weeks later, colourless claviform crystals were grown from the filtrate by slow evaporation. Analysis, found: C 35.40, H 4.02, N 10.36, S 11.36%; C₁₆H₂₂CdN₄O₆S₂ requires: C 35.36, H 4.05, N 10.31, S 11.42%. IR (KBr, ν, cm^-1): 771.2[γ(CC—H)], 745.7(γCH₂); 1188.3, 1157.4, 1040.6(ν SO₃^-); 1607.7, 1571.7(ν CC + ν CN); 3266.2(ν N—H). CCDC 614219.

Computing details top

Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); 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 coordination of Cd²⁺ ion of (I) with the atom-numbering scheme. Displacement ellipsoids drawn at the 30% probability level. H atoms have been omitted. [Symmetry codes: (A)1 - x, -1/2 + y, 0.5 - z; (B)x, 0.5 - y, -1/2 + z; (C)1 - x, -y, -z; (D)1 - x, 1/2 + y, 0.5 - z]
	Fig. 2. The two-dimensional layer structure of (I). H atoms have been omitted.
	Fig. 3. The hydrogen bonding interactions in (I)(dashed lines) projected in the plane bc. H atoms on C atoms have been omitted.
	Fig. 4. Packing diagram for (I), showing π-π stacking as dashed lines in the plane ab. H atoms on C have been deleted.

Poly[bis[µ₂-2-(2-pyridylmethylamino)ethanesulfonato]cadmium(II)] top

Crystal data top

[Cd(C₈H₁₁N₂O₃S)₂]	F(000) = 548
M_r = 542.90	D_x = 1.881 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 3852 reflections
a = 8.8982 (8) Å	θ = 2.4–28.2°
b = 14.0206 (12) Å	µ = 1.40 mm⁻¹
c = 7.9040 (7) Å	T = 291 K
β = 103.579 (1)°	Claviform, colourless
V = 958.52 (15) Å³	0.22 × 0.16 × 0.12 mm
Z = 2

Data collection top

Bruker APEXII CCD area-detector diffractometer	2178 independent reflections
Radiation source: fine-focus sealed tube	2008 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.011
ϕ and ω scans	θ_max = 27.5°, θ_min = 2.4°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −7→11
T_min = 0.749, T_max = 0.849	k = −18→15
5691 measured reflections	l = −10→10

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)] = 0.019	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.049	H-atom parameters constrained
S = 1.03	w = 1/[σ²(F_o²) + (0.0237P)² + 0.5977P] where P = (F_o² + 2F_c²)/3
2178 reflections	(Δ/σ)_max < 0.001
133 parameters	Δρ_max = 0.48 e Å⁻³
0 restraints	Δρ_min = −0.38 e Å⁻³

Crystal data top

[Cd(C₈H₁₁N₂O₃S)₂]	V = 958.52 (15) Å³
M_r = 542.90	Z = 2
Monoclinic, P2₁/c	Mo Kα radiation
a = 8.8982 (8) Å	µ = 1.40 mm⁻¹
b = 14.0206 (12) Å	T = 291 K
c = 7.9040 (7) Å	0.22 × 0.16 × 0.12 mm
β = 103.579 (1)°

Data collection top

Bruker APEXII CCD area-detector diffractometer	2178 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	2008 reflections with I > 2σ(I)
T_min = 0.749, T_max = 0.849	R_int = 0.011
5691 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.019	0 restraints
wR(F²) = 0.049	H-atom parameters constrained
S = 1.03	Δρ_max = 0.48 e Å⁻³
2178 reflections	Δρ_min = −0.38 e Å⁻³
133 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
Cd1	0.5000	0.0000	0.0000	0.02456 (7)
S1	0.33469 (5)	0.35013 (3)	0.12343 (6)	0.02701 (10)
O1	0.17221 (17)	0.35246 (12)	0.0384 (2)	0.0474 (4)
O2	0.36412 (18)	0.38778 (10)	0.30088 (18)	0.0382 (3)
O3	0.43417 (19)	0.39430 (11)	0.0247 (2)	0.0446 (4)
N1	0.72897 (17)	0.05064 (11)	−0.05239 (19)	0.0265 (3)
N2	0.60386 (17)	0.11240 (10)	0.22587 (19)	0.0260 (3)
H2	0.5777	0.0929	0.3250	0.031*
C1	0.7692 (2)	0.04398 (15)	−0.2058 (2)	0.0342 (4)
H1	0.7061	0.0096	−0.2957	0.041*
C2	0.9010 (2)	0.08650 (17)	−0.2341 (3)	0.0409 (5)
H2A	0.9275	0.0800	−0.3406	0.049*
C3	0.9923 (2)	0.13852 (18)	−0.1025 (3)	0.0456 (5)
H3	1.0805	0.1688	−0.1196	0.055*
C4	0.9522 (2)	0.14571 (16)	0.0561 (3)	0.0393 (5)
H4	1.0134	0.1805	0.1468	0.047*
C5	0.8193 (2)	0.10009 (13)	0.0778 (2)	0.0270 (4)
C6	0.7732 (2)	0.10068 (13)	0.2504 (2)	0.0289 (4)
H6A	0.8052	0.0413	0.3111	0.035*
H6B	0.8260	0.1525	0.3217	0.035*
C7	0.5616 (2)	0.21429 (13)	0.1977 (2)	0.0301 (4)
H7A	0.6054	0.2395	0.1055	0.036*
H7B	0.6048	0.2499	0.3031	0.036*
C8	0.3876 (2)	0.22747 (12)	0.1489 (2)	0.0289 (4)
H8A	0.3435	0.1996	0.2386	0.035*
H8B	0.3451	0.1940	0.0409	0.035*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Cd1	0.02285 (10)	0.02064 (10)	0.03077 (10)	−0.00396 (6)	0.00747 (7)	−0.00131 (7)
S1	0.0320 (2)	0.0237 (2)	0.0260 (2)	0.00119 (16)	0.00802 (17)	−0.00138 (16)
O1	0.0355 (8)	0.0447 (9)	0.0561 (10)	0.0066 (6)	−0.0011 (7)	−0.0040 (7)
O2	0.0547 (9)	0.0275 (7)	0.0328 (7)	−0.0018 (6)	0.0109 (6)	−0.0074 (6)
O3	0.0567 (9)	0.0389 (8)	0.0447 (8)	0.0005 (7)	0.0249 (7)	0.0101 (7)
N1	0.0246 (7)	0.0267 (8)	0.0287 (7)	−0.0016 (6)	0.0071 (6)	0.0000 (6)
N2	0.0295 (7)	0.0237 (7)	0.0263 (7)	−0.0002 (6)	0.0098 (6)	0.0002 (6)
C1	0.0332 (10)	0.0393 (11)	0.0309 (9)	0.0007 (8)	0.0092 (8)	−0.0007 (8)
C2	0.0353 (10)	0.0545 (13)	0.0375 (10)	0.0039 (9)	0.0178 (9)	0.0075 (10)
C3	0.0289 (10)	0.0554 (14)	0.0563 (14)	−0.0057 (9)	0.0176 (9)	0.0085 (11)
C4	0.0274 (9)	0.0428 (11)	0.0468 (12)	−0.0094 (8)	0.0071 (8)	−0.0037 (9)
C5	0.0234 (8)	0.0245 (8)	0.0324 (9)	0.0015 (6)	0.0052 (7)	0.0018 (7)
C6	0.0271 (9)	0.0294 (9)	0.0277 (8)	−0.0013 (7)	0.0018 (7)	−0.0015 (7)
C7	0.0336 (9)	0.0217 (8)	0.0361 (9)	−0.0005 (7)	0.0103 (8)	−0.0035 (7)
C8	0.0332 (9)	0.0226 (8)	0.0316 (9)	−0.0006 (7)	0.0089 (7)	−0.0056 (7)

Geometric parameters (Å, º) top

Cd1—N1	2.2853 (14)	C1—C2	1.380 (3)
Cd1—N1ⁱ	2.2853 (14)	C1—H1	0.9300
Cd1—O2ⁱⁱ	2.3496 (14)	C2—C3	1.370 (3)
Cd1—O2ⁱⁱⁱ	2.3497 (14)	C2—H2A	0.9300
Cd1—N2	2.3979 (15)	C3—C4	1.385 (3)
Cd1—N2ⁱ	2.3979 (15)	C3—H3	0.9300
S1—O1	1.4447 (15)	C4—C5	1.390 (3)
S1—O3	1.4496 (15)	C4—H4	0.9300
S1—O2	1.4635 (14)	C5—C6	1.514 (2)
S1—C8	1.7821 (18)	C6—H6A	0.9700
O2—Cd1^iv	2.3497 (14)	C6—H6B	0.9700
N1—C5	1.341 (2)	C7—C8	1.516 (3)
N1—C1	1.346 (2)	C7—H7A	0.9700
N2—C7	1.481 (2)	C7—H7B	0.9700
N2—C6	1.483 (2)	C8—H8A	0.9700
N2—H2	0.9100	C8—H8B	0.9700

N1—Cd1—N1ⁱ	180	N1—C1—H1	118.9
N1—Cd1—O2ⁱⁱ	89.37 (5)	C2—C1—H1	118.9
N1ⁱ—Cd1—O2ⁱⁱ	90.63 (5)	C3—C2—C1	118.77 (19)
N1—Cd1—O2ⁱⁱⁱ	90.63 (5)	C3—C2—H2A	120.6
N1ⁱ—Cd1—O2ⁱⁱⁱ	89.37 (5)	C1—C2—H2A	120.6
O2ⁱⁱ—Cd1—O2ⁱⁱⁱ	179.999 (1)	C2—C3—C4	119.59 (19)
N1—Cd1—N2	74.13 (5)	C2—C3—H3	120.2
N1ⁱ—Cd1—N2	105.87 (5)	C4—C3—H3	120.2
O2ⁱⁱ—Cd1—N2	83.89 (5)	C3—C4—C5	119.02 (19)
O2ⁱⁱⁱ—Cd1—N2	96.11 (5)	C3—C4—H4	120.5
N1—Cd1—N2ⁱ	105.87 (5)	C5—C4—H4	120.5
N1ⁱ—Cd1—N2ⁱ	74.13 (5)	N1—C5—C4	121.17 (17)
O2ⁱⁱ—Cd1—N2ⁱ	96.11 (5)	N1—C5—C6	116.99 (15)
O2ⁱⁱⁱ—Cd1—N2ⁱ	83.89 (5)	C4—C5—C6	121.80 (17)
N2—Cd1—N2ⁱ	180.0	N2—C6—C5	111.41 (14)
O1—S1—O3	114.25 (10)	N2—C6—H6A	109.3
O1—S1—O2	111.86 (9)	C5—C6—H6A	109.3
O3—S1—O2	111.57 (9)	N2—C6—H6B	109.3
O1—S1—C8	106.47 (9)	C5—C6—H6B	109.3
O3—S1—C8	107.12 (9)	H6A—C6—H6B	108.0
O2—S1—C8	104.88 (9)	N2—C7—C8	111.36 (15)
S1—O2—Cd1^iv	146.26 (9)	N2—C7—H7A	109.4
C5—N1—C1	119.27 (16)	C8—C7—H7A	109.4
C5—N1—Cd1	114.90 (11)	N2—C7—H7B	109.4
C1—N1—Cd1	125.37 (13)	C8—C7—H7B	109.4
C7—N2—C6	109.95 (14)	H7A—C7—H7B	108.0
C7—N2—Cd1	118.81 (11)	C7—C8—S1	111.93 (12)
C6—N2—Cd1	103.10 (10)	C7—C8—H8A	109.2
C7—N2—H2	108.2	S1—C8—H8A	109.2
C6—N2—H2	108.2	C7—C8—H8B	109.2
Cd1—N2—H2	108.2	S1—C8—H8B	109.2
N1—C1—C2	122.17 (19)	H8A—C8—H8B	107.9

O1—S1—O2—Cd1^iv	−124.02 (16)	Cd1—N1—C1—C2	171.82 (15)
O3—S1—O2—Cd1^iv	5.3 (2)	N1—C1—C2—C3	−1.1 (3)
C8—S1—O2—Cd1^iv	120.97 (16)	C1—C2—C3—C4	1.3 (3)
O2ⁱⁱ—Cd1—N1—C5	−71.71 (12)	C2—C3—C4—C5	−0.3 (3)
O2ⁱⁱⁱ—Cd1—N1—C5	108.29 (12)	C1—N1—C5—C4	1.0 (3)
N2—Cd1—N1—C5	12.12 (12)	Cd1—N1—C5—C4	−171.65 (15)
N2ⁱ—Cd1—N1—C5	−167.88 (12)	C1—N1—C5—C6	−176.72 (16)
O2ⁱⁱ—Cd1—N1—C1	116.16 (16)	Cd1—N1—C5—C6	10.6 (2)
O2ⁱⁱⁱ—Cd1—N1—C1	−63.84 (16)	C3—C4—C5—N1	−0.9 (3)
N2—Cd1—N1—C1	−160.01 (16)	C3—C4—C5—C6	176.77 (19)
N2ⁱ—Cd1—N1—C1	19.99 (16)	C7—N2—C6—C5	−80.67 (18)
N1—Cd1—N2—C7	90.73 (12)	Cd1—N2—C6—C5	46.99 (15)
N1ⁱ—Cd1—N2—C7	−89.27 (12)	N1—C5—C6—N2	−42.0 (2)
O2ⁱⁱ—Cd1—N2—C7	−178.19 (12)	C4—C5—C6—N2	140.29 (18)
O2ⁱⁱⁱ—Cd1—N2—C7	1.81 (12)	C6—N2—C7—C8	172.59 (14)
N1—Cd1—N2—C6	−31.13 (10)	Cd1—N2—C7—C8	54.25 (18)
N1ⁱ—Cd1—N2—C6	148.87 (10)	N2—C7—C8—S1	177.53 (12)
O2ⁱⁱ—Cd1—N2—C6	59.95 (10)	O1—S1—C8—C7	166.69 (13)
O2ⁱⁱⁱ—Cd1—N2—C6	−120.05 (10)	O3—S1—C8—C7	44.07 (16)
C5—N1—C1—C2	0.0 (3)	O2—S1—C8—C7	−74.60 (15)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N2—H2···O3^v	0.91	2.26	3.089 (2)	152

Symmetry code: (v) x, −y+1/2, z+1/2.

Experimental details

Crystal data
Chemical formula	[Cd(C₈H₁₁N₂O₃S)₂]
M_r	542.90
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	291
a, b, c (Å)	8.8982 (8), 14.0206 (12), 7.9040 (7)
β (°)	103.579 (1)
V (Å³)	958.52 (15)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	1.40
Crystal size (mm)	0.22 × 0.16 × 0.12

Data collection
Diffractometer	Bruker APEXII CCD area-detector diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.749, 0.849
No. of measured, independent and observed [I > 2σ(I)] reflections	5691, 2178, 2008
R_int	0.011
(sin θ/λ)_max (Å⁻¹)	0.649

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.019, 0.049, 1.03
No. of reflections	2178
No. of parameters	133
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.48, −0.38

Computer programs: APEX2 (Bruker, 2004), SAINT (Bruker, 2004), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Selected geometric parameters (Å, º) top

Cd1—N1	2.2853 (14)	Cd1—N2	2.3979 (15)
Cd1—O2ⁱ	2.3496 (14)

N1—Cd1—N1ⁱⁱ	180	O2ⁱ—Cd1—N2	83.89 (5)
N1—Cd1—O2ⁱ	89.37 (5)	O2ⁱⁱⁱ—Cd1—N2	96.11 (5)
N1—Cd1—N2	74.13 (5)	N1—Cd1—N2ⁱⁱ	105.87 (5)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N2—H2···O3^iv	0.91	2.26	3.089 (2)	151.5

Symmetry code: (iv) x, −y+1/2, z+1/2.

Acknowledgements

This work was supported financially by the National Natural Science Foundation of China (No. 20771054).

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