Poly[[tri-μ3-hydroxido-tris­(μ4-pyridine-2,5-dicarboxyl­ato)trineodymium(III)] monohydrate]

Zhang, Q.; Wang, X.; Wang, S.-T.; Liu, C.-B.; Che, G.-B.

doi:10.1107/S160053681201286X

metal-organic compounds

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ISSN: 2056-9890

Volume 68| Part 5| May 2012| Pages m541-m542

doi:10.1107/S160053681201286X

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Poly[[tri-μ₃-hydroxido-tris(μ₄-pyridine-2,5-dicarboxylato)trineodymium(III)] monohydrate]

Qing Zhang,^a Xing Wang,^a Shen-Tang Wang,^a Chun-Bo Liu ^a ^* and Guang-Bo Che ^a

^aSchool of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China
^*Correspondence e-mail: guangbocheujs@yahoo.com.cn

(Received 1 January 2012; accepted 24 March 2012; online 4 April 2012)

In the title compound, {[Nd₃(C₇H₃NO₄)₃(OH)₃]·H₂O}_n, the Nd^III atom is eight-coordinated by the three O atoms of three asymmetrically μ₃-bridging hydroxide groups, by four carboxylate O atoms of four different pyridine-2,5-dicarboxylate (2,5-pydc) ligands, and by the N atom of a 2,5-pydc ligand. Six Nd atoms are connected by six hydroxide groups, forming an [Nd₆(μ₃-OH)₆] cluster unit of symmetry -3 and a slightly compressed octahedral geometry. Adjacent [Nd₆(μ₃-OH)₆] clusters are connected by the 2,5-pydc ligands, via O and N atoms, forming chains along the c axis. The remaining O atoms of the 2,5-pydc ligands link these chains into a three-dimensional framework. A disordered water molecule, located on a threefold rotation axis at the opposite side of the [Nd₆(μ₃-OH)₆] cluster and exposed to each of the three Nd atoms, completes the structure.

Related literature

For the importance of the 2,5-pyridine dicarboxylate ligand, see: Qin et al. (2005 ); Song et al. (2005 ); Huang, Jiang et al. (2008 ); Huang et al. (2007 ). For related coordination polymers involving 2,5-pyridine dicarboxylate ligands, see: Aghabozorg et al. (2008 ); Xu et al. (2008 ); Colak et al. (2010 ). For the use of compounds with M—O—M frameworks, see: Huang et al. (2007); Price et al. (2001 ); Huang, Song et al. (2008 ); Zhang et al. (2009 ).

Experimental

Crystal data

[Nd₃(C₇H₃NO₄)₃(OH)₃]·H₂O
M_r = 997.07
Hexagonal, $[R \overline 3]$
a = 23.081 (3) Å
c = 8.9690 (18) Å
V = 4138.0 (12) Å³
Z = 6
Mo Kα radiation
μ = 5.65 mm⁻¹
T = 297 K
0.16 × 0.15 × 0.11 mm

Data collection

Bruker SMART CCD area-detector diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2002 ) T_min = 0.421, T_max = 0.538
3454 measured reflections
1679 independent reflections
1558 reflections with I > 2σ(I)
R_int = 0.018

Refinement

R[F² > 2σ(F²)] = 0.019
wR(F²) = 0.043
S = 1.10
1679 reflections
133 parameters
H atoms treated by a mixture of independent and constrained refinement
Δρ_max = 0.77 e Å⁻³
Δρ_min = −0.65 e Å⁻³

Table 1
Selected bond lengths (Å)

Nd1—O2ⁱ	2.395 (2)
Nd1—O3ⁱⁱ	2.426 (2)
Nd1—O1ⁱⁱⁱ	2.452 (2)
Nd1—O4	2.480 (2)
Nd1—O5	2.482 (2)
Nd1—O5^iv	2.485 (2)
Nd1—O5^v	2.501 (2)
Nd1—N1	2.747 (3)
Symmetry codes: (i) $[-x+y-{\script{1\over 3}}, -x+{\script{1\over 3}}, z+{\script{1\over 3}}]$ ; (ii) y, -x+y, -z; (iii) $[-x+{\script{1\over 3}}, -y+{\script{2\over 3}}, -z+{\script{2\over 3}}]$ ; (iv) x-y, x, -z+1; (v) y, -x+y, -z+1.

Data collection: SMART (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); 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/S160053681201286X/qk2031sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S160053681201286X/qk2031Isup2.hkl

checkCIF report

Comment top

In recent years, much attention has been paid to the research on the coordination chemistry of 2,5-pyridinedicarboxylic acid (2,5-pydc), including complexes of lanthanide (Qin et al. 2005; Song et al. 2005; Huang et al. 2007; Huang, Jiang et al. 2008). The 2,5-pydc ligand acts as a good O donor as well as a N donor, owing to the two carboxylate groups and the pyridine ring, which may help to increase the dimensionality of the assembled covalent network (Aghabozorg et al. 2008; Xu et al. 2008; Colak et al. 2010). In addition, the construction of multidimensional M–O–M frameworks has been shown to produce materials with effective cooperation and has also lead to improvements in thermal stabilities (Huang et al. 2007; Price et al. 2001; Huang, Song et al. 2008; Zhang et al. 2009)

The title compound crystallizes in a trigonal lattice of space group symmetry R3. The neodymium atom is trivalent and is eight-coordinated by three oxygen atoms (O5, O5^iv and O5^v) of three µ₃-bridging hydroxyls, four carboxylate oxygen atoms (O1ⁱⁱⁱ, O2ⁱ, O3ⁱⁱ and O4) of four different 2,5-pydc ligands, and a nitrogen atom (N1) of a 2,5-pydc ligand as shown in Fig. 1. Each six Nd atoms are connected by six hydroxide groups to form a cluster unit [Nd₆(µ₃-OH)₆] of symmetry 3 and with the shape of an octahedron slightly compressed along the threefold crystallographic axis (Fig. 2). The Nd-O bond lengths in this cluster vary from 2.482 (3) to 2.502 (3) Å, and the internal Nd···Nd distances are 4.018 (inclinded to the threefold axis) and 4.530 Å (perpendicular to the threefold axis). Such cluster units are linked by 2,5-pydc ligands via their O3, O4, and N1 atoms to form an extended single-chain structure as shown in Fig. 3. Neighbouring single chains are then connected by the O1 and O2 atoms of the 2,5-pydc ligands to form a three-dimensional network (Fig. 4). Each 2,5-pydc ligand acts as a µ₄-bridge to link four Nd atoms, in which the nitrogen N1 and the oxygen O4 of the 2-carboxylate group chelate one Nd, while its other oxygen O3 ligates another Nd atom in monodentate mode. The 5-carboxylate group ligates two Nd atoms in dimonodentate fashion. The crystal structure is completed by a water molecule O1w, which is located on a threefold axis and has a pyramidal environment by three Nd at a distance of 2.984 (3) Å, which is about 0.5 Å longer than that of the coordination partners of Nd. The relatively large anisotropic displacement parameters of O1w indicate, that this molecule is disordered and that it probably deviates somewhat from the average position on the threefold axis.

Related literature top

For the importance of the 2,5-pyridine dicarboxylic acid ligand, see: Qin et al. (2005); Song et al. (2005); Huang, Jiang et al. (2008); Huang et al. (2007). For related coordination polymers involving 2,5-pyridine dicarboxylic acid ligands, see: Aghabozorg et al. (2008); Xu et al. (2008); Colak et al. (2010). For the use of M—O—M frameworks, see: Huang et al. (2007); Price et al. (2001); Huang, Song et al. (2008); Zhang et al. (2009).

Experimental top

All reagents were commercially available and used without any further purification. A mixture of 2,5-pyridine dicarboxylic acid (0.0167 g, 0.1 mmol), Nd(NO₃)₃.6H₂O (0.0661 g, 0.2 mmol), 13 drops of 1 mol/L NaOH and distilled water (10 mL) was placed in a 25 mL Teflon-lined stainless steel autoclave, and heated at 453 K for 3 days. Cooling slowly to room temperature, the pink prism crystals of title complex were obtained.

Computing details top

Data collection: SMART (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); data reduction: SAINT (Bruker, 2002); 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 asymmetric unit of tittle compound with the atom numbering scheme. Displacement ellipsoids are drawn at the 30% probability level (arbitrary spheres for the H atoms). (Symmetry codes: #1 -x+y-1/3,-x+1/3,z+1/3; #2 y,-x+y,-z; #3 -x+1/3,-y+2/3,-z+2/3; #4 x-y,x,-z+1; #5 y,-x+y,-z+1)
	Fig. 2. View of the hexanuclear [Nd₆(µ₃-OH)₆] cluster unit in the title compound.
	Fig. 3. 1-D chain structure of the [Nd₆(µ₃-OH)₆] clusters linked by 2,5-pydc ligands along the c-axis. H atoms have been omitted.
	Fig. 4. View of the three-dimensional structure of title compound linked by 2,5-pydc ligands. H atoms and O1w have been omitted.

Poly[[tri-µ₃-hydroxido-tris(µ₄-pyridine-2,5- dicarboxylato)trineodymium(III)] monohydrate] top

Crystal data top

[Nd₃(C₇H₃NO₄)₃(OH)₃]·H₂O	D_x = 2.401 Mg m⁻³
M_r = 997.07	Mo Kα radiation, λ = 0.71073 Å
Hexagonal, R3	Cell parameters from 3338 reflections
Hall symbol: -R 3	θ = 3.1–29.0°
a = 23.081 (3) Å	µ = 5.65 mm⁻¹
c = 8.9690 (18) Å	T = 297 K
V = 4138.0 (12) Å³	Prism, pink
Z = 6	0.16 × 0.15 × 0.11 mm
F(000) = 2814

Data collection top

Bruker SMART CCD area-detector diffractometer	1679 independent reflections
Radiation source: fine-focus sealed tube	1558 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.018
ω scans	θ_max = 25.3°, θ_min = 3.1°
Absorption correction: multi-scan (SADABS; Bruker, 2002)	h = −17→26
T_min = 0.421, T_max = 0.538	k = −27→23
3454 measured reflections	l = −10→7

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) = 0.043	H atoms treated by a mixture of independent and constrained refinement
S = 1.10	w = 1/[σ²(F_o²) + (0.021P)²] where P = (F_o² + 2F_c²)/3
1679 reflections	(Δ/σ)_max = 0.001
133 parameters	Δρ_max = 0.77 e Å⁻³
0 restraints	Δρ_min = −0.65 e Å⁻³

Crystal data top

[Nd₃(C₇H₃NO₄)₃(OH)₃]·H₂O	Z = 6
M_r = 997.07	Mo Kα radiation
Hexagonal, R3	µ = 5.65 mm⁻¹
a = 23.081 (3) Å	T = 297 K
c = 8.9690 (18) Å	0.16 × 0.15 × 0.11 mm
V = 4138.0 (12) Å³

Data collection top

Bruker SMART CCD area-detector diffractometer	1679 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2002)	1558 reflections with I > 2σ(I)
T_min = 0.421, T_max = 0.538	R_int = 0.018
3454 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.019	0 restraints
wR(F²) = 0.043	H atoms treated by a mixture of independent and constrained refinement
S = 1.10	Δρ_max = 0.77 e Å⁻³
1679 reflections	Δρ_min = −0.65 e Å⁻³
133 parameters

Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 > 2sigma(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
Nd1	0.041666 (9)	0.128240 (9)	0.329953 (18)	0.00891 (7)
C1	0.03699 (16)	0.21892 (16)	0.0150 (4)	0.0131 (7)
C2	0.0445 (2)	0.26676 (18)	−0.0868 (4)	0.0253 (9)
H2	0.0244	0.2544	−0.1801	0.030*
C3	0.0822 (2)	0.33329 (18)	−0.0484 (4)	0.0290 (10)
H3	0.0873	0.3664	−0.1150	0.035*
C4	0.11239 (17)	0.35025 (16)	0.0903 (4)	0.0157 (7)
C5	0.10166 (17)	0.29858 (16)	0.1863 (4)	0.0137 (7)
H5	0.1211	0.3095	0.2804	0.016*
C6	−0.00545 (16)	0.14569 (16)	−0.0166 (4)	0.0121 (7)
C7	0.15650 (17)	0.42256 (17)	0.1364 (4)	0.0150 (8)
N1	0.06494 (13)	0.23415 (13)	0.1504 (3)	0.0113 (6)
O1	0.19772 (12)	0.43481 (11)	0.2386 (3)	0.0186 (6)
O2	0.14805 (13)	0.46471 (12)	0.0684 (3)	0.0261 (6)
O3	−0.02355 (11)	0.12927 (11)	−0.1493 (2)	0.0147 (5)
O4	−0.02057 (12)	0.10561 (11)	0.0918 (3)	0.0167 (5)
O1w	0.0000	0.0000	0.1697 (6)	0.0634 (18)
O5	0.03467 (11)	0.10550 (12)	0.6017 (3)	0.0118 (5)
H1	0.0397 (19)	0.1334 (18)	0.650 (5)	0.018*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Nd1	0.00801 (11)	0.01015 (11)	0.00950 (11)	0.00524 (8)	0.00187 (7)	0.00291 (7)
C1	0.0133 (17)	0.0111 (17)	0.0147 (17)	0.0060 (15)	−0.0010 (14)	−0.0013 (14)
C2	0.037 (2)	0.019 (2)	0.0163 (18)	0.0109 (18)	−0.0151 (17)	−0.0036 (17)
C3	0.043 (3)	0.0125 (19)	0.024 (2)	0.0085 (19)	−0.0149 (19)	0.0048 (16)
C4	0.0184 (19)	0.0104 (17)	0.0162 (18)	0.0057 (15)	−0.0035 (15)	−0.0027 (15)
C5	0.0146 (17)	0.0117 (17)	0.0134 (17)	0.0056 (15)	−0.0029 (14)	−0.0012 (14)
C6	0.0075 (16)	0.0135 (17)	0.0136 (17)	0.0039 (14)	0.0005 (14)	−0.0043 (14)
C7	0.0141 (17)	0.0104 (17)	0.0154 (18)	0.0023 (15)	0.0022 (15)	0.0008 (15)
N1	0.0113 (14)	0.0098 (14)	0.0115 (14)	0.0044 (12)	−0.0018 (12)	−0.0018 (11)
O1	0.0217 (14)	0.0120 (12)	0.0182 (13)	0.0055 (11)	−0.0091 (11)	−0.0003 (10)
O2	0.0294 (15)	0.0104 (13)	0.0324 (15)	0.0054 (12)	−0.0165 (13)	0.0040 (12)
O3	0.0144 (12)	0.0151 (13)	0.0132 (12)	0.0063 (10)	−0.0013 (10)	−0.0043 (10)
O4	0.0180 (13)	0.0114 (12)	0.0120 (12)	0.0008 (11)	0.0006 (10)	−0.0003 (10)
O1w	0.085 (3)	0.085 (3)	0.020 (3)	0.0425 (15)	0.000	0.000
O5	0.0129 (12)	0.0141 (12)	0.0106 (12)	0.0085 (11)	−0.0015 (10)	−0.0039 (10)

Geometric parameters (Å, º) top

Nd1—O2ⁱ	2.395 (2)	C4—C5	1.389 (5)
Nd1—O3ⁱⁱ	2.426 (2)	C4—C7	1.515 (5)
Nd1—O1ⁱⁱⁱ	2.452 (2)	C5—N1	1.331 (4)
Nd1—O4	2.480 (2)	C5—H5	0.9300
Nd1—O5	2.482 (2)	C6—O3	1.256 (4)
Nd1—O5^iv	2.485 (2)	C6—O4	1.264 (4)
Nd1—O5^v	2.501 (2)	C7—O2	1.244 (4)
Nd1—N1	2.747 (3)	C7—O1	1.247 (4)
C1—N1	1.337 (4)	O1—Nd1ⁱⁱⁱ	2.452 (2)
C1—C2	1.375 (5)	O2—Nd1^vi	2.395 (2)
C1—C6	1.497 (4)	O3—Nd1^vii	2.426 (2)
C2—C3	1.377 (5)	O5—Nd1^v	2.485 (2)
C2—H2	0.9300	O5—Nd1^iv	2.501 (2)
C3—C4	1.384 (5)	O5—H1	0.73 (4)
C3—H3	0.9300

O2ⁱ—Nd1—O3ⁱⁱ	133.07 (8)	O5—Nd1—Nd1^v	36.03 (5)
O2ⁱ—Nd1—O1ⁱⁱⁱ	80.41 (9)	O5^iv—Nd1—Nd1^v	91.91 (6)
O3ⁱⁱ—Nd1—O1ⁱⁱⁱ	77.55 (8)	O5^v—Nd1—Nd1^v	36.09 (5)
O2ⁱ—Nd1—O4	85.50 (9)	N1—Nd1—Nd1^v	139.35 (5)
O3ⁱⁱ—Nd1—O4	78.54 (8)	Nd1^iv—Nd1—Nd1^v	68.623 (13)
O1ⁱⁱⁱ—Nd1—O4	130.65 (8)	N1—C1—C2	122.8 (3)
O2ⁱ—Nd1—O5	81.79 (8)	N1—C1—C6	115.2 (3)
O3ⁱⁱ—Nd1—O5	131.58 (7)	C2—C1—C6	122.0 (3)
O1ⁱⁱⁱ—Nd1—O5	77.64 (8)	C1—C2—C3	119.0 (3)
O4—Nd1—O5	146.31 (7)	C1—C2—H2	120.5
O2ⁱ—Nd1—O5^iv	77.35 (8)	C3—C2—H2	120.5
O3ⁱⁱ—Nd1—O5^iv	138.97 (8)	C2—C3—C4	119.2 (3)
O1ⁱⁱⁱ—Nd1—O5^iv	142.14 (8)	C2—C3—H3	120.4
O4—Nd1—O5^iv	77.63 (8)	C4—C3—H3	120.4
O5—Nd1—O5^iv	69.19 (8)	C3—C4—C5	117.8 (3)
O2ⁱ—Nd1—O5^v	150.20 (8)	C3—C4—C7	121.6 (3)
O3ⁱⁱ—Nd1—O5^v	69.18 (8)	C5—C4—C7	120.7 (3)
O1ⁱⁱⁱ—Nd1—O5^v	87.76 (8)	N1—C5—C4	123.4 (3)
O4—Nd1—O5^v	122.15 (8)	N1—C5—H5	118.3
O5—Nd1—O5^v	68.94 (8)	C4—C5—H5	118.3
O5^iv—Nd1—O5^v	96.63 (11)	O3—C6—O4	125.4 (3)
O2ⁱ—Nd1—N1	65.27 (8)	O3—C6—C1	116.8 (3)
O3ⁱⁱ—Nd1—N1	68.36 (8)	O4—C6—C1	117.8 (3)
O1ⁱⁱⁱ—Nd1—N1	70.02 (8)	O2—C7—O1	125.7 (3)
O4—Nd1—N1	61.14 (8)	O2—C7—C4	116.5 (3)
O5—Nd1—N1	136.65 (8)	O1—C7—C4	117.8 (3)
O5^iv—Nd1—N1	124.92 (8)	C5—N1—C1	117.8 (3)
O5^v—Nd1—N1	135.26 (8)	C5—N1—Nd1	125.8 (2)
O2ⁱ—Nd1—Nd1^iv	65.95 (6)	C1—N1—Nd1	116.4 (2)
O3ⁱⁱ—Nd1—Nd1^iv	160.68 (5)	C7—O1—Nd1ⁱⁱⁱ	133.4 (2)
O1ⁱⁱⁱ—Nd1—Nd1^iv	106.55 (6)	C7—O2—Nd1^vi	142.0 (2)
O4—Nd1—Nd1^iv	110.13 (5)	C6—O3—Nd1^vii	148.7 (2)
O5—Nd1—Nd1^iv	36.42 (5)	C6—O4—Nd1	126.1 (2)
O5^iv—Nd1—Nd1^iv	35.97 (5)	Nd1—O5—Nd1^v	108.00 (8)
O5^v—Nd1—Nd1^iv	91.90 (6)	Nd1—O5—Nd1^iv	107.49 (8)
N1—Nd1—Nd1^iv	130.94 (6)	Nd1^v—O5—Nd1^iv	130.61 (10)
O2ⁱ—Nd1—Nd1^v	114.28 (7)	Nd1—O5—H1	115 (3)
O3ⁱⁱ—Nd1—Nd1^v	96.13 (6)	Nd1^v—O5—H1	104 (3)
O1ⁱⁱⁱ—Nd1—Nd1^v	69.98 (5)	Nd1^iv—O5—H1	91 (3)
O4—Nd1—Nd1^v	155.32 (5)

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

Experimental details

Crystal data
Chemical formula	[Nd₃(C₇H₃NO₄)₃(OH)₃]·H₂O
M_r	997.07
Crystal system, space group	Hexagonal, R3
Temperature (K)	297
a, c (Å)	23.081 (3), 8.9690 (18)
V (Å³)	4138.0 (12)
Z	6
Radiation type	Mo Kα
µ (mm⁻¹)	5.65
Crystal size (mm)	0.16 × 0.15 × 0.11

Data collection
Diffractometer	Bruker SMART CCD area-detector diffractometer
Absorption correction	Multi-scan (SADABS; Bruker, 2002)
T_min, T_max	0.421, 0.538
No. of measured, independent and observed [I > 2σ(I)] reflections	3454, 1679, 1558
R_int	0.018
(sin θ/λ)_max (Å⁻¹)	0.602

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.019, 0.043, 1.10
No. of reflections	1679
No. of parameters	133
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	0.77, −0.65

Computer programs: SMART (Bruker, 2002), SAINT (Bruker, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Selected bond lengths (Å) top

Nd1—O2ⁱ	2.395 (2)	Nd1—O5	2.482 (2)
Nd1—O3ⁱⁱ	2.426 (2)	Nd1—O5^iv	2.485 (2)
Nd1—O1ⁱⁱⁱ	2.452 (2)	Nd1—O5^v	2.501 (2)
Nd1—O4	2.480 (2)	Nd1—N1	2.747 (3)

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

Acknowledgements

The authors thank Jiangsu University for supporting this work.

References

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