Tetra-μ-acetato-κ4O:O′;κ3O,O′:O;κ3O:O,O′-bis­[(acetato-κ2O,O′)(1,10-phenanthroline-κ2N,N′)europium(III)]

Fan, R.-Q.; Sun, C.-F.; Yang, Y.-L.

doi:10.1107/S1600536810046131

metal-organic compounds

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ISSN: 2056-9890

Volume 66| Part 12| December 2010| Page m1565

https://doi.org/10.1107/S1600536810046131

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Tetra-μ-acetato-κ⁴O:O′;κ³O,O′:O;κ³O:O,O′-bis[(acetato-κ²O,O′)(1,10-phenanthroline-κ²N,N′)europium(III)]

Rui-Qing Fan,^a ^* Cun-Fa Sun ^a and Yu-Lin Yang ^a

^aDepartment of Chemistry, Harbin Institute of Technology, Harbin 150001, People's Republic of China
^*Correspondence e-mail: fanruiqing@163.com

(Received 23 September 2010; accepted 9 November 2010; online 13 November 2010)

In the title centrosymmetric dinuclear complex, [Eu₂(CH₃CO₂)₆(C₁₂H₈N₂)₂], the Eu^III atom is nine-coordinated by two N atoms from a 1,10-phenanthroline ligand and seven O atoms from five acetate ligands (two bidentate, three monodentate). The crystal structure is stabilized by π–π stacking interactions between the pyridine and benzene rings of adjacent molecules, with a centroid–centroid distance of 3.829 (2) Å.

Related literature

For general background to lanthanide complexes based on nitrogen-containing organic ligands, see: Lima et al. (2009 ); Prasad & Rajasekharan (2009 ); Xiang et al. (2009 ); Yang et al. (2009 ).

Experimental

Crystal data

[Eu₂(C₂H₃O₂)₆(C₁₂H₈N₂)₂]
M_r = 1018.59
Monoclinic, P 2₁ /c
a = 9.7249 (19) Å
b = 23.670 (5) Å
c = 8.2984 (17) Å
β = 90.32 (3)°
V = 1910.2 (7) Å³
Z = 2
Mo Kα radiation
μ = 3.32 mm⁻¹
T = 293 K
0.20 × 0.10 × 0.08 mm

Data collection

Bruker APEX CCD diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.559, T_max = 0.789
18210 measured reflections
4324 independent reflections
2668 reflections with I > 2σ(I)
R_int = 0.125

Refinement

R[F² > 2σ(F²)] = 0.057
wR(F²) = 0.101
S = 0.99
4324 reflections
244 parameters
H-atom parameters constrained
Δρ_max = 1.02 e Å⁻³
Δρ_min = −0.90 e Å⁻³

Table 1
Selected bond lengths (Å)

Eu1—O1	2.465 (5)
Eu1—O2	2.443 (5)
Eu1—O3	2.509 (5)
Eu1—O4	2.380 (5)
Eu1—O5ⁱ	2.387 (4)
Eu1—O6	2.372 (4)
Eu1—O6ⁱ	2.630 (5)
Eu1—N1	2.639 (6)
Eu1—N2	2.613 (6)
Symmetry code: (i) -x, -y, -z+2.

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 Mercury (Macrae et al., 2006 ); software used to prepare material for publication: SHELXTL.

Supporting information

Crystal structure: contains datablocks global, I. DOI: https://doi.org/10.1107/S1600536810046131/hy2358sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810046131/hy2358Isup2.hkl

checkCIF report

Comment top

Luminescent coordination compounds of lanthanide based on nitrogen-containing organic ligands have attracted intensive attention due to their potential applications in areas of sensor technologies and electro-luminescent devices (Xiang et al., 2009; Yang et al., 2009). In order to explore potential luminescent complexes of this type, a series of the lanthanide metal complexes with nitrogen-containing organic ligands have been studied (Lima et al., 2009; Prasad & Rajasekharan, 2009). Here, we report the crystal structure of a dinuclear europium(III) complex with 1,10-phenanthroline ligand.

The title dinuclear complex consists of two Eu^III ions, two 1,10-phenanthroline ligands and six acetate anions (Fig. 1). The Eu atom is nine-coordinated by two N atoms from a phenanthroline ligand and seven O atoms from five acetate anions (Table 1).

There are three different linking fashions between acetates and Eu atoms. Each Eu atom is bonded to two O atoms from a chelating acetate (O2, O3), three O atoms from two chelating and bridging acetates (O1, O6, O6ⁱ) and two O atoms from two bridging acetates [O4, O5ⁱ; symmetry code: (i) -x, -y, 2-z]. Two nine-coordinated Eu atoms are linked by edge-sharing to form a dinuclear structure. It is noteworthy that π–π stacking interactions between adjacent phenanthroline ligands play a significant role in stabilizing the structure, with a centroid–centroid distance of 3.829 (2) Å (Fig. 2).

Related literature top

For general background to lanthanide complexes based on nitrogen-containing organic ligands, see: Lima et al. (2009); Prasad & Rajasekharan (2009); Xiang et al. (2009); Yang et al. (2009).

Experimental top

The title complex was prepared under mild conditions by allowing Eu(NO₃)₃ (0.043 g, 0.1 mmol) and 1,10-phenanthroline (0.059 g, 0.3 mmol) to react in a mixed solution of N,N-dimethylformamide (10 ml) and acetic acid (2.0 ml) at 338 K for 4 d. Colorless block crystals were obtained in a 47% yield based on Eu atom.

Structure description top

For general background to lanthanide complexes based on nitrogen-containing organic ligands, see: Lima et al. (2009); Prasad & Rajasekharan (2009); Xiang et al. (2009); Yang et al. (2009).

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 Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top

	Fig. 1. The molecular structure of the title compound. Displacement ellipsoids are drawn at the 50% probability level. [Symmetry code: (A) -x, -y, 2-z.]
	Fig. 2. Packing diagram of the title compound along the a axis.

Tetra-µ-acetato-κ⁴O:O';κ³O,O': O;κ³O:O,O'- bis[(acetato-κ²O,O')(1,10-phenanthroline- κ²N,N')europium(III)] bis(µ-acetato-κ³O,O':O')bis(µ-acetato-κ²O:O') top

Crystal data top

[Eu₂(C₂H₃O₂)₆(C₁₂H₈N₂)₂]	F(000) = 1000
M_r = 1018.59	D_x = 1.771 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 3465 reflections
a = 9.7249 (19) Å	θ = 3.3–27.5°
b = 23.670 (5) Å	µ = 3.32 mm⁻¹
c = 8.2984 (17) Å	T = 293 K
β = 90.32 (3)°	Block, colorless
V = 1910.2 (7) Å³	0.20 × 0.10 × 0.08 mm
Z = 2

Data collection top

Bruker APEX CCD diffractometer	4324 independent reflections
Radiation source: fine-focus sealed tube	2668 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.125
φ and ω scans	θ_max = 27.5°, θ_min = 3.3°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −12→12
T_min = 0.559, T_max = 0.789	k = −30→30
18210 measured reflections	l = −9→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)] = 0.057	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.101	H-atom parameters constrained
S = 0.99	w = 1/[σ²(F_o²) + (0.0299P)²] where P = (F_o² + 2F_c²)/3
4324 reflections	(Δ/σ)_max < 0.001
244 parameters	Δρ_max = 1.02 e Å⁻³
0 restraints	Δρ_min = −0.90 e Å⁻³

Crystal data top

[Eu₂(C₂H₃O₂)₆(C₁₂H₈N₂)₂]	V = 1910.2 (7) Å³
M_r = 1018.59	Z = 2
Monoclinic, P2₁/c	Mo Kα radiation
a = 9.7249 (19) Å	µ = 3.32 mm⁻¹
b = 23.670 (5) Å	T = 293 K
c = 8.2984 (17) Å	0.20 × 0.10 × 0.08 mm
β = 90.32 (3)°

Data collection top

Bruker APEX CCD diffractometer	4324 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	2668 reflections with I > 2σ(I)
T_min = 0.559, T_max = 0.789	R_int = 0.125
18210 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.057	0 restraints
wR(F²) = 0.101	H-atom parameters constrained
S = 0.99	Δρ_max = 1.02 e Å⁻³
4324 reflections	Δρ_min = −0.90 e Å⁻³
244 parameters

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

	x	y	z	U_iso*/U_eq
Eu1	0.13542 (4)	0.060026 (13)	0.95103 (4)	0.03528 (13)
O1	0.0766 (5)	0.0993 (2)	1.2170 (5)	0.0495 (14)
O2	0.1771 (6)	0.0886 (2)	0.6727 (6)	0.0517 (14)
O3	0.3281 (5)	0.0295 (2)	0.7710 (6)	0.0507 (14)
O4	−0.0904 (5)	0.08694 (18)	0.8702 (6)	0.0472 (13)
O5	−0.2383 (5)	0.01441 (19)	0.8964 (6)	0.0458 (13)
O6	0.0405 (5)	−0.02279 (18)	0.8341 (5)	0.0423 (12)
N1	0.1482 (7)	0.1713 (2)	0.9431 (8)	0.0511 (16)
N2	0.3590 (6)	0.1076 (2)	1.0623 (7)	0.0408 (14)
C1	0.4668 (7)	0.0771 (3)	1.1138 (8)	0.0431 (19)
H1A	0.4622	0.0380	1.1035	0.052*
C2	0.5841 (8)	0.1002 (3)	1.1811 (9)	0.053 (2)
H2A	0.6566	0.0772	1.2133	0.063*
C3	0.5921 (9)	0.1571 (3)	1.1996 (10)	0.066 (3)
H3A	0.6702	0.1733	1.2454	0.079*
C4	0.4818 (8)	0.1915 (3)	1.1492 (10)	0.055 (2)
C5	0.4823 (11)	0.2517 (4)	1.1624 (12)	0.084 (3)
H5A	0.5565	0.2694	1.2124	0.101*
C6	0.3792 (11)	0.2832 (4)	1.1049 (12)	0.086 (3)
H6A	0.3830	0.3222	1.1162	0.103*
C7	0.2628 (9)	0.2580 (3)	1.0260 (10)	0.064 (2)
C8	0.1551 (10)	0.2892 (3)	0.9555 (11)	0.075 (3)
H8A	0.1569	0.3285	0.9596	0.090*
C9	0.0499 (11)	0.2627 (3)	0.8825 (12)	0.083 (3)
H9A	−0.0214	0.2831	0.8352	0.100*
C10	0.0503 (10)	0.2035 (3)	0.8793 (10)	0.067 (3)
H10A	−0.0233	0.1855	0.8289	0.081*
C11	0.2555 (8)	0.1984 (3)	1.0144 (9)	0.049 (2)
C12	0.3674 (8)	0.1641 (3)	1.0785 (8)	0.0447 (19)
C13	−0.0119 (7)	0.0640 (3)	1.2593 (8)	0.0391 (16)
C14	−0.0864 (8)	0.0707 (3)	1.4136 (8)	0.055 (2)
H14A	−0.1052	0.0342	1.4585	0.083*
H14B	−0.1714	0.0903	1.3944	0.083*
H14C	−0.0309	0.0921	1.4877	0.083*
C15	0.2801 (8)	0.0583 (3)	0.6569 (9)	0.0431 (17)
C16	0.3468 (9)	0.0548 (4)	0.4946 (9)	0.063 (2)
H16A	0.4343	0.0736	0.4982	0.095*
H16B	0.2889	0.0727	0.4156	0.095*
H16C	0.3600	0.0159	0.4661	0.095*
C17	−0.2064 (8)	0.0637 (3)	0.8529 (8)	0.0422 (17)
C18	−0.3164 (8)	0.0977 (3)	0.7682 (9)	0.056 (2)
H18A	−0.3995	0.0759	0.7617	0.084*
H18B	−0.2862	0.1071	0.6615	0.084*
H18C	−0.3334	0.1318	0.8275	0.084*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Eu1	0.0401 (2)	0.02511 (17)	0.0406 (2)	−0.00140 (19)	−0.00452 (14)	−0.00032 (19)
O1	0.061 (4)	0.044 (3)	0.044 (3)	−0.015 (3)	0.004 (3)	−0.011 (2)
O2	0.061 (4)	0.045 (3)	0.049 (3)	0.014 (3)	−0.002 (3)	0.005 (2)
O3	0.046 (3)	0.056 (3)	0.049 (3)	0.011 (3)	−0.004 (3)	0.002 (3)
O4	0.041 (3)	0.036 (3)	0.064 (3)	−0.003 (2)	−0.009 (3)	0.007 (3)
O5	0.047 (3)	0.030 (3)	0.059 (3)	0.000 (2)	−0.014 (3)	0.008 (2)
O6	0.055 (3)	0.027 (3)	0.044 (3)	−0.005 (2)	−0.002 (2)	−0.011 (2)
N1	0.059 (4)	0.033 (3)	0.061 (4)	0.001 (3)	−0.008 (3)	0.001 (3)
N2	0.047 (4)	0.033 (3)	0.042 (3)	−0.006 (3)	0.001 (3)	−0.001 (3)
C1	0.039 (5)	0.035 (4)	0.055 (5)	0.002 (3)	−0.004 (4)	0.003 (3)
C2	0.048 (5)	0.049 (5)	0.062 (5)	−0.003 (4)	−0.012 (4)	−0.006 (4)
C3	0.064 (6)	0.055 (5)	0.077 (6)	−0.007 (5)	−0.019 (5)	−0.014 (5)
C4	0.051 (5)	0.039 (4)	0.075 (6)	−0.008 (4)	−0.007 (4)	−0.002 (4)
C5	0.092 (8)	0.046 (5)	0.114 (8)	−0.016 (5)	−0.034 (7)	−0.012 (6)
C6	0.106 (9)	0.033 (5)	0.118 (9)	−0.011 (5)	−0.021 (7)	−0.015 (5)
C7	0.075 (7)	0.035 (4)	0.081 (6)	−0.002 (4)	−0.008 (5)	−0.003 (4)
C8	0.096 (8)	0.031 (4)	0.099 (7)	0.010 (5)	−0.017 (6)	0.005 (5)
C9	0.101 (8)	0.038 (5)	0.110 (8)	0.014 (5)	−0.037 (7)	0.006 (5)
C10	0.071 (7)	0.045 (5)	0.086 (6)	−0.002 (4)	−0.027 (5)	0.006 (5)
C11	0.057 (5)	0.028 (4)	0.061 (5)	−0.009 (4)	0.003 (4)	−0.003 (4)
C12	0.055 (5)	0.031 (4)	0.048 (4)	−0.006 (4)	0.002 (4)	−0.001 (3)
C13	0.035 (4)	0.037 (4)	0.046 (4)	0.000 (4)	−0.001 (3)	0.000 (4)
C14	0.051 (5)	0.073 (6)	0.042 (4)	−0.006 (4)	0.009 (4)	−0.015 (4)
C15	0.040 (4)	0.031 (4)	0.059 (5)	−0.007 (4)	−0.007 (4)	−0.003 (4)
C16	0.065 (6)	0.074 (6)	0.052 (5)	−0.001 (5)	0.004 (4)	−0.001 (4)
C17	0.043 (4)	0.038 (4)	0.046 (4)	0.009 (4)	0.002 (3)	−0.001 (4)
C18	0.052 (6)	0.059 (5)	0.057 (5)	0.003 (4)	−0.007 (4)	0.011 (4)

Geometric parameters (Å, º) top

Eu1—O1	2.465 (5)	C4—C12	1.412 (9)
Eu1—O2	2.443 (5)	C4—C5	1.428 (10)
Eu1—O3	2.509 (5)	C5—C6	1.335 (11)
Eu1—O4	2.380 (5)	C5—H5A	0.9300
Eu1—O5ⁱ	2.387 (4)	C6—C7	1.434 (11)
Eu1—O6	2.372 (4)	C6—H6A	0.9300
Eu1—O6ⁱ	2.630 (5)	C7—C8	1.407 (10)
Eu1—N1	2.639 (6)	C7—C11	1.414 (9)
Eu1—N2	2.613 (6)	C8—C9	1.342 (11)
O1—C13	1.251 (8)	C8—H8A	0.9300
O2—C15	1.240 (8)	C9—C10	1.401 (10)
O3—C15	1.254 (8)	C9—H9A	0.9300
O4—C17	1.262 (8)	C10—H10A	0.9300
O5—C17	1.261 (8)	C11—C12	1.456 (10)
O5—Eu1ⁱ	2.387 (4)	C13—O6ⁱ	1.276 (7)
O6—C13ⁱ	1.276 (7)	C13—C14	1.484 (10)
O6—Eu1ⁱ	2.630 (5)	C14—H14A	0.9600
N1—C10	1.328 (9)	C14—H14B	0.9600
N1—C11	1.358 (8)	C14—H14C	0.9600
N2—C1	1.342 (8)	C15—C16	1.501 (11)
N2—C12	1.346 (8)	C16—H16A	0.9600
C1—C2	1.381 (9)	C16—H16B	0.9600
C1—H1A	0.9300	C16—H16C	0.9600
C2—C3	1.356 (10)	C17—C18	1.509 (9)
C2—H2A	0.9300	C18—H18A	0.9600
C3—C4	1.409 (11)	C18—H18B	0.9600
C3—H3A	0.9300	C18—H18C	0.9600

O6—Eu1—O4	75.50 (15)	C2—C3—H3A	120.1
O6—Eu1—O5ⁱ	76.58 (15)	C4—C3—H3A	120.1
O4—Eu1—O5ⁱ	136.96 (17)	C3—C4—C12	117.0 (7)
O6—Eu1—O2	84.76 (16)	C3—C4—C5	123.5 (7)
O4—Eu1—O2	79.46 (18)	C12—C4—C5	119.5 (7)
O5ⁱ—Eu1—O2	129.42 (18)	C6—C5—C4	121.8 (8)
O6—Eu1—O1	125.90 (17)	C6—C5—H5A	119.1
O4—Eu1—O1	86.14 (18)	C4—C5—H5A	119.1
O5ⁱ—Eu1—O1	84.40 (17)	C5—C6—C7	121.3 (8)
O2—Eu1—O1	141.47 (16)	C5—C6—H6A	119.3
O6—Eu1—O3	78.98 (17)	C7—C6—H6A	119.3
O4—Eu1—O3	126.90 (16)	C8—C7—C11	117.3 (8)
O5ⁱ—Eu1—O3	77.95 (17)	C8—C7—C6	123.7 (8)
O2—Eu1—O3	52.29 (16)	C11—C7—C6	119.0 (8)
O1—Eu1—O3	145.03 (16)	C9—C8—C7	120.4 (8)
O6—Eu1—N2	145.30 (17)	C9—C8—H8A	119.8
O4—Eu1—N2	138.49 (16)	C7—C8—H8A	119.8
O5ⁱ—Eu1—N2	77.60 (16)	C8—C9—C10	118.3 (8)
O2—Eu1—N2	94.15 (18)	C8—C9—H9A	120.9
O1—Eu1—N2	73.60 (18)	C10—C9—H9A	120.9
O3—Eu1—N2	73.25 (18)	N1—C10—C9	124.7 (8)
O6—Eu1—O6ⁱ	75.36 (17)	N1—C10—H10A	117.7
O4—Eu1—O6ⁱ	71.21 (16)	C9—C10—H10A	117.7
O5ⁱ—Eu1—O6ⁱ	70.45 (16)	N1—C11—C7	122.6 (7)
O2—Eu1—O6ⁱ	147.77 (16)	N1—C11—C12	117.8 (6)
O1—Eu1—O6ⁱ	50.54 (15)	C7—C11—C12	119.6 (7)
O3—Eu1—O6ⁱ	142.95 (15)	N2—C12—C4	123.0 (7)
N2—Eu1—O6ⁱ	116.62 (16)	N2—C12—C11	118.2 (6)
O6—Eu1—N1	146.45 (16)	C4—C12—C11	118.7 (6)
O4—Eu1—N1	76.66 (18)	O1—C13—O6ⁱ	119.3 (7)
O5ⁱ—Eu1—N1	136.95 (16)	O1—C13—C14	120.7 (6)
O2—Eu1—N1	72.03 (18)	O6ⁱ—C13—C14	120.0 (7)
O1—Eu1—N1	69.92 (18)	C13—C14—H14A	109.5
O3—Eu1—N1	103.7 (2)	C13—C14—H14B	109.5
N2—Eu1—N1	62.53 (18)	H14A—C14—H14B	109.5
O6ⁱ—Eu1—N1	112.49 (18)	C13—C14—H14C	109.5
C13—O1—Eu1	99.3 (4)	H14A—C14—H14C	109.5
C15—O2—Eu1	94.4 (4)	H14B—C14—H14C	109.5
C15—O3—Eu1	91.0 (5)	O2—C15—O3	122.2 (7)
C17—O4—Eu1	137.6 (4)	O2—C15—C16	118.7 (7)
C17—O5—Eu1ⁱ	137.0 (4)	O3—C15—C16	119.1 (7)
C13ⁱ—O6—Eu1	164.5 (5)	C15—C16—H16A	109.5
C13ⁱ—O6—Eu1ⁱ	90.8 (4)	C15—C16—H16B	109.5
Eu1—O6—Eu1ⁱ	104.64 (16)	H16A—C16—H16B	109.5
C10—N1—C11	116.8 (7)	C15—C16—H16C	109.5
C10—N1—Eu1	123.3 (5)	H16A—C16—H16C	109.5
C11—N1—Eu1	119.8 (4)	H16B—C16—H16C	109.5
C1—N2—C12	117.2 (6)	O4—C17—O5	126.3 (6)
C1—N2—Eu1	121.8 (4)	O4—C17—C18	116.8 (7)
C12—N2—Eu1	120.9 (5)	O5—C17—C18	116.9 (7)
N2—C1—C2	123.9 (7)	C17—C18—H18A	109.5
N2—C1—H1A	118.1	C17—C18—H18B	109.5
C2—C1—H1A	118.1	H18A—C18—H18B	109.5
C3—C2—C1	119.1 (7)	C17—C18—H18C	109.5
C3—C2—H2A	120.5	H18A—C18—H18C	109.5
C1—C2—H2A	120.5	H18B—C18—H18C	109.5
C2—C3—C4	119.9 (7)

Symmetry code: (i) −x, −y, −z+2.

Experimental details

Crystal data
Chemical formula	[Eu₂(C₂H₃O₂)₆(C₁₂H₈N₂)₂]
M_r	1018.59
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	293
a, b, c (Å)	9.7249 (19), 23.670 (5), 8.2984 (17)
β (°)	90.32 (3)
V (Å³)	1910.2 (7)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	3.32
Crystal size (mm)	0.20 × 0.10 × 0.08

Data collection
Diffractometer	Bruker APEX CCD
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.559, 0.789
No. of measured, independent and observed [I > 2σ(I)] reflections	18210, 4324, 2668
R_int	0.125
(sin θ/λ)_max (Å⁻¹)	0.649

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.057, 0.101, 0.99
No. of reflections	4324
No. of parameters	244
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	1.02, −0.90

Computer programs: SMART (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008) and Mercury (Macrae et al., 2006), SHELXTL (Sheldrick, 2008).

Selected bond lengths (Å) top

Eu1—O1	2.465 (5)	Eu1—O6	2.372 (4)
Eu1—O2	2.443 (5)	Eu1—O6ⁱ	2.630 (5)
Eu1—O3	2.509 (5)	Eu1—N1	2.639 (6)
Eu1—O4	2.380 (5)	Eu1—N2	2.613 (6)
Eu1—O5ⁱ	2.387 (4)

Symmetry code: (i) −x, −y, −z+2.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21071035, 20771030 and 20971031), the Science Innovation Special Foundation of Harbin City in China (2010RFQXG017) and the Research Fund for the Doctoral Program of Higher Education (20070213005).

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