Poly[diaqua­(μ2-oxalato-κ4O1,O2:O1′,O2′)(μ2-pyrazine-2-carboxyl­ato-κ4N1,O:O,O′)neodymium(III)]

Chen, K.-C.; Luo, H.-M.; Meng, Q.-H.; Luo, Y.-F.; Zeng, R.-H.

doi:10.1107/S1600536809031250

metal-organic compounds

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ISSN: 2056-9890

Volume 65| Part 9| September 2009| Pages m1065-m1066

doi:10.1107/S1600536809031250

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Poly[diaqua(μ₂-oxalato-κ⁴O¹,O²:O^1′,O^2′)(μ₂-pyrazine-2-carboxylato-κ⁴N¹,O:O,O′)neodymium(III)]

Ke-Chun Chen,^a Huan-Mian Luo,^a Qiu-Hui Meng,^a Yi-Fan Luo ^a ^* and Rong-Hua Zeng ^a,^b

^aSchool of Chemistry and Environment, South China Normal University, Guangzhou 510006, People's Republic of China, and ^bKey Laboratory of the Technology of Electrochemical Energy Storage and Power Generation in Guangdong Universities, South China Normal University, Guangzhou 510006, People's Republic of China
^*Correspondence e-mail: luoyf2004@yahoo.com.cn

(Received 29 July 2009; accepted 7 August 2009; online 12 August 2009)

In the title complex, [Nd(C₅H₃N₂O₂)(C₂O₄)(H₂O)₂]_n, the Nd^III atom is ten-coordinated by one N atom and three O atoms from two pyrazine-2-carboxylate ligands, four O atoms from two oxalate ligands and two water molecules in a distorted bicapped square-antiprismatic geometry. The two crystallographically independent oxalate ligands, each lying on an inversion center, act as bridging ligands, linking Nd atoms into an extended zigzag chain. Neighboring chains are linked by the pyrazine-2-carboxylate ligands into a two-dimensional layerlike network in the (10 $[\overline{1}]$ ) plane. The layers are further connected by O—H⋯O and O—H⋯N hydrogen bonds, forming a three-dimensional supramolecular network.

Related literature

For general background to lanthanide coordination frameworks, see: Han et al. (2009 ); Li et al. (2006 ); Wang et al. (2006 ); Zhou et al. (2006 ).

Experimental

Crystal data

[Nd(C₅H₃N₂O₂)(C₂O₄)(H₂O)₂]
M_r = 391.39
Triclinic, $[P \overline 1]$
a = 7.948 (3) Å
b = 8.6512 (18) Å
c = 8.7425 (18) Å
α = 115.525 (2)°
β = 101.970 (3)°
γ = 96.306 (3)°
V = 517.0 (2) Å³
Z = 2
Mo Kα radiation
μ = 5.06 mm⁻¹
T = 296 K
0.23 × 0.19 × 0.17 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.320, T_max = 0.420
2533 measured reflections
1824 independent reflections
1756 reflections with I > 2σ(I)
R_int = 0.065

Refinement

R[F² > 2σ(F²)] = 0.051
wR(F²) = 0.132
S = 1.08
1824 reflections
175 parameters
6 restraints
H atoms treated by a mixture of independent and constrained refinement
Δρ_max = 1.95 e Å⁻³
Δρ_min = −2.98 e Å⁻³

Table 1
Selected bond lengths (Å)

Nd1—O2W	2.467 (5)
Nd1—O3	2.474 (5)
Nd1—O6ⁱ	2.490 (5)
Nd1—O4ⁱⁱ	2.508 (5)
Nd1—O5	2.512 (5)
Nd1—O1W	2.549 (6)
Nd1—O2ⁱⁱⁱ	2.557 (5)
Nd1—O2	2.573 (5)
Nd1—N1ⁱⁱⁱ	2.765 (6)
Nd1—O1	2.885 (6)
Symmetry codes: (i) -x+1, -y+1, -z+1; (ii) -x+2, -y+2, -z+2; (iii) -x+2, -y+1, -z+2.

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1W—H1W⋯O1^iv	0.84 (9)	2.02 (6)	2.707 (8)	139 (7)
O1W—H2W⋯O6^v	0.85 (8)	2.07 (4)	2.838 (8)	152 (6)
O2W—H3W⋯N2^vi	0.84 (5)	2.50 (5)	3.229 (9)	145 (6)
O2W—H4W⋯O4^vii	0.84 (8)	2.13 (4)	2.872 (8)	147 (7)
Symmetry codes: (iv) -x+2, -y+1, -z+1; (v) x+1, y, z; (vi) x-1, y, z; (vii) x, y-1, z.

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

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536809031250/hy2217sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536809031250/hy2217Isup2.hkl

checkCIF report

Comment top

In recent years, many research groups have devoted their work to the design and synthesis of lanthanide coordination frameworks with bridging multifunctional organic ligands, not only because of their fascinating topological networks, but also due to their potential applications in ion exchange, gas storage, catalysis and luminescence (Wang et al., 2006; Zhou et al., 2006). As a building block, pyrazine-2-carboxylic acid and oxalic acid are good ligands with multifunctional coordination sites providing a high likelihood for the generation of structures with high dimensions (Han et al., 2009; Li et al., 2006). Recently, we obtained the title coordination polymer under hydrothermal conditions.

In the title compound, the Nd^III atom is coordinated by seven O atoms and one N atom from two pyrazine-2-carboxylate ligands and two oxalate ligands, and by two water molecules in a distorted bicapped square-antiprismatic geometry (Fig. 1). The Nd^III atoms are linked by the oxalate ligands, forming an extended zigzag chain. These chains are linked by the pyrazine-2-carboxylate ligands into a two-dimensional layerlike network (Fig. 2). The Nd—O and Nd—N bond lengths range from 2.467 (4) to 2.885 (6) Å (Table 1). O—H···O and O—H···N hydrogen bonds (Table 2) involving the pyrazine-2-carboxylate ligands, coordinated water molecules and oxalate ligands assemble neighboring layers into a three-dimensional supramolecular network.

Related literature top

For general background to lanthanide coordination frameworks, see: Han et al. (2009); Li et al. (2006); Wang et al. (2006); Zhou et al. (2006).

Experimental top

A mixture of Nd₂O₃ (0.245 g, 0.75 mmol), pyrazine-2-carboxylic acid (0.186 g, 1.5 mmol), oxalic acid (0.135 g, 1.5 mmol), water (10 ml) in the presence of HNO₃ (0.024 g, 0.385 mmol) was stirred vigorously for 20 min and then sealed in a Teflon-lined stainless-steel autoclave (20 ml capacity). The autoclave was heated and maintained at 433 K for 3 d, and then cooled to room temperature at 5 K h^-1. Colorless block crystals of the title compound were obtained.

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: 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 codes: (i) 1-x, 1-y, 1-z; (ii) 2-x, 2-y, 2-z; (iii) 2-x, 1-y, 2-z.]
	Fig. 2. View of the layered network in the title compound.

Poly[diaqua(µ₂-oxalato- κ⁴O¹,O²:O^1',O^2')(µ₂-pyrazine- 2-carboxylato-κ⁴N¹,O:O,O')neodymium(III)] top

Crystal data top

[Nd(C₅H₃N₂O₂)(C₂O₄)(H₂O)₂]	Z = 2
M_r = 391.39	F(000) = 374
Triclinic, P1	D_x = 2.514 Mg m⁻³
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 7.948 (3) Å	Cell parameters from 2522 reflections
b = 8.6512 (18) Å	θ = 2.7–28.3°
c = 8.7425 (18) Å	µ = 5.06 mm⁻¹
α = 115.525 (2)°	T = 296 K
β = 101.970 (3)°	Block, colorless
γ = 96.306 (3)°	0.23 × 0.19 × 0.17 mm
V = 517.0 (2) Å³

Data collection top

Bruker APEXII CCD diffractometer	1824 independent reflections
Radiation source: fine-focus sealed tube	1756 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.065
ϕ and ω scans	θ_max = 25.2°, θ_min = 2.7°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −8→9
T_min = 0.320, T_max = 0.420	k = −8→10
2533 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)] = 0.051	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.132	H atoms treated by a mixture of independent and constrained refinement
S = 1.08	w = 1/[σ²(F_o²) + (0.0478P)² + 0.0313P] where P = (F_o² + 2F_c²)/3
1824 reflections	(Δ/σ)_max = 0.002
175 parameters	Δρ_max = 1.95 e Å⁻³
6 restraints	Δρ_min = −2.98 e Å⁻³

Crystal data top

[Nd(C₅H₃N₂O₂)(C₂O₄)(H₂O)₂]	γ = 96.306 (3)°
M_r = 391.39	V = 517.0 (2) Å³
Triclinic, P1	Z = 2
a = 7.948 (3) Å	Mo Kα radiation
b = 8.6512 (18) Å	µ = 5.06 mm⁻¹
c = 8.7425 (18) Å	T = 296 K
α = 115.525 (2)°	0.23 × 0.19 × 0.17 mm
β = 101.970 (3)°

Data collection top

Bruker APEXII CCD diffractometer	1824 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	1756 reflections with I > 2σ(I)
T_min = 0.320, T_max = 0.420	R_int = 0.065
2533 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.051	6 restraints
wR(F²) = 0.132	H atoms treated by a mixture of independent and constrained refinement
S = 1.08	Δρ_max = 1.95 e Å⁻³
1824 reflections	Δρ_min = −2.98 e Å⁻³
175 parameters

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

	x	y	z	U_iso*/U_eq
C1	1.1008 (9)	0.3421 (10)	0.7510 (9)	0.0146 (15)
C2	1.2220 (10)	0.2213 (10)	0.7476 (10)	0.0175 (15)
C3	1.2449 (13)	0.0959 (12)	0.5928 (12)	0.0246 (19)
H3	1.1882	0.0920	0.4865	0.030*
C4	1.4345 (11)	0.0053 (11)	0.7489 (11)	0.0227 (17)
H4	1.5126	−0.0660	0.7543	0.027*
C5	1.4166 (11)	0.1312 (11)	0.9049 (11)	0.0235 (17)
H5	1.4818	0.1415	1.0116	0.028*
C6	0.9283 (8)	1.0062 (9)	0.9289 (9)	0.0114 (14)
C7	0.4413 (9)	0.5252 (9)	0.5645 (9)	0.0156 (15)
H1W	1.058 (11)	0.745 (10)	0.649 (9)	0.023*
H2W	1.143 (10)	0.630 (10)	0.676 (10)	0.023*
H3W	0.599 (5)	0.229 (10)	0.680 (9)	0.023*
H4W	0.731 (9)	0.226 (9)	0.802 (10)	0.023*
N1	1.3077 (9)	0.2389 (9)	0.9065 (8)	0.0175 (13)
N2	1.3439 (9)	−0.0191 (9)	0.5892 (9)	0.0240 (15)
Nd1	0.83941 (4)	0.58653 (4)	0.82456 (4)	0.0124 (2)
O1	1.0011 (8)	0.3228 (8)	0.6106 (7)	0.0244 (13)
O2	1.1050 (7)	0.4616 (7)	0.9021 (7)	0.0182 (11)
O3	0.8094 (7)	0.8693 (7)	0.8272 (7)	0.0185 (11)
O4	0.9419 (7)	1.1485 (7)	0.9251 (7)	0.0192 (11)
O5	0.5149 (7)	0.5678 (8)	0.7214 (7)	0.0230 (12)
O6	0.2843 (7)	0.5193 (8)	0.4984 (6)	0.0210 (11)
O1W	1.0754 (9)	0.6971 (9)	0.7148 (8)	0.0240 (13)
O2W	0.7008 (7)	0.2834 (7)	0.7480 (7)	0.0204 (11)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.019 (4)	0.013 (4)	0.016 (4)	0.002 (3)	0.009 (3)	0.009 (3)
C2	0.024 (4)	0.013 (4)	0.016 (4)	0.001 (3)	0.005 (3)	0.007 (3)
C3	0.034 (5)	0.016 (5)	0.020 (4)	0.005 (4)	0.007 (4)	0.006 (4)
C4	0.028 (4)	0.016 (4)	0.028 (4)	0.010 (3)	0.016 (4)	0.010 (4)
C5	0.025 (4)	0.024 (4)	0.030 (4)	0.011 (3)	0.009 (3)	0.018 (4)
C6	0.008 (3)	0.006 (3)	0.014 (3)	−0.001 (2)	−0.001 (3)	0.001 (3)
C7	0.018 (4)	0.006 (4)	0.016 (4)	0.000 (3)	0.007 (3)	−0.001 (3)
N1	0.023 (3)	0.015 (3)	0.018 (3)	0.008 (3)	0.007 (3)	0.009 (3)
N2	0.029 (4)	0.013 (3)	0.027 (4)	0.003 (3)	0.014 (3)	0.004 (3)
Nd1	0.0159 (3)	0.0065 (3)	0.0146 (3)	0.00016 (19)	0.0035 (2)	0.0058 (2)
O1	0.032 (3)	0.027 (3)	0.021 (3)	0.010 (3)	0.009 (2)	0.016 (3)
O2	0.022 (3)	0.014 (3)	0.024 (3)	0.006 (2)	0.011 (2)	0.012 (2)
O3	0.016 (3)	0.013 (3)	0.024 (3)	0.000 (2)	0.000 (2)	0.010 (2)
O4	0.025 (3)	0.010 (3)	0.024 (3)	0.002 (2)	0.003 (2)	0.011 (2)
O5	0.022 (3)	0.033 (3)	0.019 (3)	0.009 (2)	0.008 (2)	0.014 (3)
O6	0.019 (3)	0.024 (3)	0.015 (3)	0.004 (2)	0.003 (2)	0.006 (2)
O1W	0.033 (3)	0.022 (3)	0.022 (3)	0.008 (3)	0.013 (3)	0.012 (3)
O2W	0.029 (3)	0.007 (3)	0.022 (3)	−0.003 (2)	0.006 (2)	0.006 (2)

Geometric parameters (Å, º) top

C1—O1	1.246 (9)	Nd1—O2W	2.467 (5)
C1—O2	1.270 (9)	Nd1—O3	2.474 (5)
C1—C2	1.492 (10)	Nd1—O6ⁱⁱ	2.490 (5)
C2—N1	1.350 (10)	Nd1—O4ⁱ	2.508 (5)
C2—C3	1.386 (11)	Nd1—O5	2.512 (5)
C3—N2	1.328 (11)	Nd1—O1W	2.549 (6)
C3—H3	0.9300	Nd1—O2ⁱⁱⁱ	2.557 (5)
C4—N2	1.345 (11)	Nd1—O2	2.573 (5)
C4—C5	1.379 (11)	Nd1—N1ⁱⁱⁱ	2.765 (6)
C4—H4	0.9300	Nd1—O1	2.885 (6)
C5—N1	1.337 (10)	O2—Nd1ⁱⁱⁱ	2.557 (5)
C5—H5	0.9300	O4—Nd1ⁱ	2.508 (5)
C6—O4	1.239 (9)	O6—Nd1ⁱⁱ	2.490 (5)
C6—O3	1.259 (9)	O1W—H1W	0.84 (9)
C6—C6ⁱ	1.553 (13)	O1W—H2W	0.85 (8)
C7—O5	1.243 (9)	O2W—H3W	0.84 (5)
C7—O6	1.247 (9)	O2W—H4W	0.84 (8)
C7—C7ⁱⁱ	1.560 (13)

O1—C1—O2	123.1 (7)	O6ⁱⁱ—Nd1—O2ⁱⁱⁱ	151.94 (19)
O1—C1—C2	120.3 (6)	O4ⁱ—Nd1—O2ⁱⁱⁱ	72.00 (17)
O2—C1—C2	116.6 (6)	O5—Nd1—O2ⁱⁱⁱ	107.89 (16)
N1—C2—C3	121.0 (7)	O1W—Nd1—O2ⁱⁱⁱ	125.89 (18)
N1—C2—C1	115.7 (6)	O2W—Nd1—O2	76.93 (18)
C3—C2—C1	123.3 (7)	O3—Nd1—O2	133.80 (17)
N2—C3—C2	123.2 (8)	O6ⁱⁱ—Nd1—O2	113.72 (16)
N2—C3—H3	118.4	O4ⁱ—Nd1—O2	76.60 (17)
C2—C3—H3	118.4	O5—Nd1—O2	153.11 (18)
N2—C4—C5	122.9 (7)	O1W—Nd1—O2	74.92 (18)
N2—C4—H4	118.6	O2ⁱⁱⁱ—Nd1—O2	60.11 (19)
C5—C4—H4	118.6	O2W—Nd1—N1ⁱⁱⁱ	97.86 (19)
N1—C5—C4	121.6 (7)	O3—Nd1—N1ⁱⁱⁱ	72.90 (18)
N1—C5—H5	119.2	O6ⁱⁱ—Nd1—N1ⁱⁱⁱ	128.29 (18)
C4—C5—H5	119.2	O4ⁱ—Nd1—N1ⁱⁱⁱ	68.70 (19)
O4—C6—O3	126.2 (6)	O5—Nd1—N1ⁱⁱⁱ	65.79 (18)
O4—C6—C6ⁱ	117.3 (8)	O1W—Nd1—N1ⁱⁱⁱ	131.7 (2)
O3—C6—C6ⁱ	116.4 (8)	O2ⁱⁱⁱ—Nd1—N1ⁱⁱⁱ	59.62 (17)
O5—C7—O6	127.3 (6)	O2—Nd1—N1ⁱⁱⁱ	116.80 (17)
O5—C7—C7ⁱⁱ	116.5 (8)	O2W—Nd1—O1	66.01 (18)
O6—C7—C7ⁱⁱ	116.2 (8)	O3—Nd1—O1	128.48 (16)
C5—N1—C2	116.2 (7)	O6ⁱⁱ—Nd1—O1	66.65 (16)
C5—N1—Nd1ⁱⁱⁱ	126.3 (5)	O4ⁱ—Nd1—O1	113.54 (17)
C2—N1—Nd1ⁱⁱⁱ	114.6 (5)	O5—Nd1—O1	120.34 (17)
C3—N2—C4	114.9 (7)	O1W—Nd1—O1	64.46 (19)
O2W—Nd1—O3	149.08 (18)	O2ⁱⁱⁱ—Nd1—O1	99.62 (15)
O2W—Nd1—O6ⁱⁱ	83.06 (18)	O2—Nd1—O1	47.38 (16)
O3—Nd1—O6ⁱⁱ	80.47 (18)	N1ⁱⁱⁱ—Nd1—O1	158.20 (17)
O2W—Nd1—O4ⁱ	139.97 (17)	C1—O1—Nd1	87.4 (4)
O3—Nd1—O4ⁱ	65.15 (16)	C1—O2—Nd1ⁱⁱⁱ	122.1 (4)
O6ⁱⁱ—Nd1—O4ⁱ	135.42 (18)	C1—O2—Nd1	101.6 (4)
O2W—Nd1—O5	76.22 (19)	Nd1ⁱⁱⁱ—O2—Nd1	119.89 (19)
O3—Nd1—O5	73.09 (18)	C6—O3—Nd1	120.1 (4)
O6ⁱⁱ—Nd1—O5	64.36 (16)	C6—O4—Nd1ⁱ	119.1 (4)
O4ⁱ—Nd1—O5	124.93 (17)	C7—O5—Nd1	121.0 (4)
O2W—Nd1—O1W	130.01 (19)	C7—O6—Nd1ⁱⁱ	121.8 (4)
O3—Nd1—O1W	68.27 (19)	Nd1—O1W—H1W	125 (5)
O6ⁱⁱ—Nd1—O1W	71.92 (19)	Nd1—O1W—H2W	117 (6)
O4ⁱ—Nd1—O1W	69.52 (19)	H1W—O1W—H2W	105 (8)
O5—Nd1—O1W	125.09 (18)	Nd1—O2W—H3W	124 (5)
O2W—Nd1—O2ⁱⁱⁱ	68.90 (17)	Nd1—O2W—H4W	128 (5)
O3—Nd1—O2ⁱⁱⁱ	124.64 (16)	H3W—O2W—H4W	106 (8)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1W—H1W···O1^iv	0.84 (9)	2.02 (6)	2.707 (8)	139 (7)
O1W—H2W···O6^v	0.85 (8)	2.07 (4)	2.838 (8)	152 (6)
O2W—H3W···N2^vi	0.84 (5)	2.50 (5)	3.229 (9)	145 (6)
O2W—H4W···O4^vii	0.84 (8)	2.13 (4)	2.872 (8)	147 (7)

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

Experimental details

Crystal data
Chemical formula	[Nd(C₅H₃N₂O₂)(C₂O₄)(H₂O)₂]
M_r	391.39
Crystal system, space group	Triclinic, P1
Temperature (K)	296
a, b, c (Å)	7.948 (3), 8.6512 (18), 8.7425 (18)
α, β, γ (°)	115.525 (2), 101.970 (3), 96.306 (3)
V (Å³)	517.0 (2)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	5.06
Crystal size (mm)	0.23 × 0.19 × 0.17

Data collection
Diffractometer	Bruker APEXII CCD diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.320, 0.420
No. of measured, independent and observed [I > 2σ(I)] reflections	2533, 1824, 1756
R_int	0.065
(sin θ/λ)_max (Å⁻¹)	0.599

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.051, 0.132, 1.08
No. of reflections	1824
No. of parameters	175
No. of restraints	6
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	1.95, −2.98

Computer programs: APEX2 (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg, 1999), SHELXTL (Sheldrick, 2008).

Selected bond lengths (Å) top

Nd1—O2W	2.467 (5)	Nd1—O1W	2.549 (6)
Nd1—O3	2.474 (5)	Nd1—O2ⁱⁱⁱ	2.557 (5)
Nd1—O6ⁱ	2.490 (5)	Nd1—O2	2.573 (5)
Nd1—O4ⁱⁱ	2.508 (5)	Nd1—N1ⁱⁱⁱ	2.765 (6)
Nd1—O5	2.512 (5)	Nd1—O1	2.885 (6)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1W—H1W···O1^iv	0.84 (9)	2.02 (6)	2.707 (8)	139 (7)
O1W—H2W···O6^v	0.85 (8)	2.07 (4)	2.838 (8)	152 (6)
O2W—H3W···N2^vi	0.84 (5)	2.50 (5)	3.229 (9)	145 (6)
O2W—H4W···O4^vii	0.84 (8)	2.13 (4)	2.872 (8)	147 (7)

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

Acknowledgements

The authors acknowledge the Chan Xue Yan Cooperative Special Project of Guangdong Province and the Ministry of Science and Technology of PRC (project No. 2007A090302046) and the Project of Science and Technology of Guangdong Province (project No. 2007A020200002-4) for supporting this work.

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