Tetra­aqua­trinitratoeuropium(III) dihydrate

Stumpf, T.; Bolte, M.

doi:10.1107/S1600536801001271

Tetraaquatrinitratoeuropium(III) dihydrate

In the title compound, [Eu(NO₃)₃(H₂O)₄]·2H₂O, the Eu atom is ten-coordinated by three bidentate nitrates and four water molecules. Furthermore, two water molecules are included in the crystal structure forming a complicated network of hydrogen bonds. [Eu(NO₃)₃(H₂O)₄]·2H₂O is isostructural with other lanthanide analogues.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536801001271/cf6039sup1.cif Contains datablocks I, global
	Structure factor file (CIF format) https://doi.org/10.1107/S1600536801001271/cf6039Isup2.hkl Contains datablock I

checkCIF report

Key indicators

Single-crystal X-ray study
T = 173 K
Mean (O-N) = 0.003 Å
R factor = 0.016
wR factor = 0.039
Data-to-parameter ratio = 15.6

checkCIF results

No syntax errors found

ADDSYM reports no extra symmetry

PLATON alerts of the form PLAT_7?? have been detected for an inorganic
structure. These tests are under development  for inorganics and
comments are welcomed. It is not necessary to supply a data
validation response form for these alerts at this time.


 Alert Level B:



REFLT_03
         From the CIF: _diffrn_reflns_theta_max           30.90
         From the CIF: _reflns_number_total               3448
         TEST2: Reflns within _diffrn_reflns_theta_max
         Count of symmetry unique reflns         3932
         Completeness (_total/calc)             87.69%
          Alert B: < 90% complete (theta max?)

Author response: The data are over 99% complete to 52 deg. in 2theta.

PLAT_731  Alert B Bond    Calc     0.83(5), Rep   0.833(10) ....       5.00 s.u-Ratio
                     O2   -H2A     1.555   1.555

PLAT_735  Alert B D-H     Calc     0.83(5), Rep   0.833(10) ....       5.00 s.u-Ratio
                     O2   -H2A     1.555   1.555

PLAT_735  Alert B D-H     Calc     0.83(5), Rep   0.833(10) ....       5.00 s.u-Ratio
                     O2   -H2A     1.555   1.555


 Alert Level C:



PLAT_731  Alert C Bond    Calc     0.84(3), Rep   0.837(10) ....       3.00 s.u-Ratio
                     O1   -H1A     1.555   1.555

PLAT_731  Alert C Bond    Calc     0.83(3), Rep   0.829(10) ....       3.00 s.u-Ratio
                     O3   -H3B     1.555   1.555

PLAT_731  Alert C Bond    Calc     0.83(3), Rep   0.836(10) ....       3.00 s.u-Ratio
                     O4   -H4B     1.555   1.555

PLAT_731  Alert C Bond    Calc     0.83(3), Rep   0.837(10) ....       3.00 s.u-Ratio
                     O5   -H5A     1.555   1.555

PLAT_731  Alert C Bond    Calc     0.82(4), Rep   0.827(10) ....       4.00 s.u-Ratio
                     O5   -H5B     1.555   1.555

PLAT_731  Alert C Bond    Calc     0.84(3), Rep   0.842(10) ....       3.00 s.u-Ratio
                     O6   -H6A     1.555   1.555

PLAT_731  Alert C Bond    Calc     0.84(3), Rep   0.835(10) ....       3.00 s.u-Ratio
                     O6   -H6B     1.555   1.555

PLAT_735  Alert C D-H     Calc     0.84(3), Rep   0.837(10) ....       3.00 s.u-Ratio
                     O1   -H1A     1.555   1.555

PLAT_735  Alert C D-H     Calc     0.83(3), Rep   0.829(10) ....       3.00 s.u-Ratio
                     O3   -H3B     1.555   1.555

PLAT_735  Alert C D-H     Calc     0.83(3), Rep   0.836(10) ....       3.00 s.u-Ratio
                     O4   -H4B     1.555   1.555

PLAT_735  Alert C D-H     Calc     0.83(3), Rep   0.837(10) ....       3.00 s.u-Ratio
                     O5   -H5A     1.555   1.555

PLAT_735  Alert C D-H     Calc     0.82(4), Rep   0.827(10) ....       4.00 s.u-Ratio
                     O5   -H5B     1.555   1.555

PLAT_735  Alert C D-H     Calc     0.82(4), Rep   0.827(10) ....       4.00 s.u-Ratio
                     O5   -H5B     1.555   1.555

PLAT_735  Alert C D-H     Calc     0.84(3), Rep   0.842(10) ....       3.00 s.u-Ratio
                     O6   -H6A     1.555   1.555

PLAT_735  Alert C D-H     Calc     0.84(3), Rep   0.835(10) ....       3.00 s.u-Ratio
                     O6   -H6B     1.555   1.555

PLAT_735  Alert C D-H     Calc     0.84(3), Rep   0.835(10) ....       3.00 s.u-Ratio
                     O6   -H6B     1.555   1.555

PLAT_736  Alert C H...A   Calc     1.89(3), Rep   1.889(11) ....       2.73 s.u-Ratio
                     H1A  -O5      1.555   1.555

PLAT_736  Alert C H...A   Calc     1.90(3), Rep   1.904(10) ....       3.00 s.u-Ratio
                     H3B  -O6      1.555   1.555

PLAT_736  Alert C H...A   Calc     1.86(3), Rep   1.857(13) ....       2.31 s.u-Ratio
                     H4A  -O6      1.555   2.666

PLAT_736  Alert C H...A   Calc     2.15(3), Rep   2.141(13) ....       2.31 s.u-Ratio
                     H4B  -O22     1.555   2.566

PLAT_736  Alert C H...A   Calc     2.00(3), Rep   1.993(13) ....       2.31 s.u-Ratio
                     H5A  -O13     1.555   1.655

PLAT_736  Alert C H...A   Calc     2.01(3), Rep   2.013(14) ....       2.14 s.u-Ratio
                     H6A  -O23     1.555   2.566


 0 Alert Level A = Potentially serious problem

 4 Alert Level B = Potential problem

 22 Alert Level C = Please check

Comment top

In the series of tetraaquatrinitratolanthanide dihydrates, the structures from cerbium to terbium with the exception of the Pm and Eu compounds are known. Whereas this fact is not astonishing in the case of promethium, which is radioactive, it is surprising that the europium structure has not been determined yet. In order to fill this gap, we present in this article the structure of [Eu(NO₃)₃(H₂O)₄]^.2H₂O.

Three bidentate nitrates and four coordinated water molecules produce a ten-coordinated europium with six different Eu—O bonds between 2.511 (2) and 2.741 (2) Å to the nitrate groups and four slightly shorter bonds to water molecules between 2.379 (2) and 2.412 (2) Å. One nitrate ion is asymmetrically bonded and the Eu—O21 distance is about 0.2 Å longer than the other Eu—O distances. Two further H₂O molecules in the second coordination sphere of the europium are included as crystal water. The three nitrate groups are located on the same side of the Eu ion, while the water molecules are located on the other side. The crystal packing is stabilized by a complicated network of hydrogen bonds.

The structure of the title compound is isostructural with the already known [Ln(NO₃)₃(H₂O)₄]^.2H₂O structures [Ln = Pr (Fuller & Jacobsen, 1976; Volodina et al., 1961; Rumanova et al., 1964), Nd (Rogers et al., 1983; Shi & Wang, 1991), Sm (Shi & Wang, 1990), Gd (Ma et al., 1991) and Tb (Moret et al., 1990)]. It fits well into and completes this series.

Experimental top

At 373 K, 0.352 g (1 mmol) Eu₂O₃ (99.99%; Across) was dissolved in 10 ml 1.0 mol l^-1 HNO₃. From the light yellow solution, crystals appeared at room temperature within 5 d.

Computing details top

Data collection: SMART (Siemens, 1995); cell refinement: SMART; data reduction: SAINT (Siemens, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 1990); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: XP in SHELXTL-Plus (Sheldrick, 1991); software used to prepare material for publication: SHELXL97.

Figures top

Fig. 1. A perspective view of the title compound with the atom-numbering scheme. Displacement ellipsoids are at the 50% probability level.

; top

Crystal data top

[Eu(NO₃)₃(H₂O)₄]·2H₂O	Z = 2
M_r = 446.09	F(000) = 432
Triclinic, P1	D_x = 2.383 Mg m⁻³
a = 6.705 (1) Å	Mo Kα radiation, λ = 0.71073 Å
b = 9.140 (1) Å	Cell parameters from 5718 reflections
c = 11.647 (1) Å	θ = 1–25°
α = 69.71 (1)°	µ = 5.13 mm⁻¹
β = 88.94 (1)°	T = 173 K
γ = 69.29 (1)°	Block, colourless
V = 621.79 (13) Å³	0.41 × 0.39 × 0.28 mm

Data collection top

Siemens CCD three-circle diffractometer	3448 independent reflections
Radiation source: fine-focus sealed tube	3284 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.022
ω scans	θ_max = 30.9°, θ_min = 1.9°
Absorption correction: empirical (using intensity measurements) (SADABS; Sheldrick, 1996)	h = −9→9
T_min = 0.148, T_max = 0.238	k = −11→13
12544 measured reflections	l = −15→15

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.016	H atoms treated by a mixture of independent and constrained refinement
wR(F²) = 0.039	w = 1/[σ²(F_o²) + (0.0218P)² + 0.063P] where P = (F_o² + 2F_c²)/3
S = 1.13	(Δ/σ)_max = 0.002
3448 reflections	Δρ_max = 1.42 e Å⁻³
221 parameters	Δρ_min = −0.66 e Å⁻³
12 restraints	Extinction correction: SHELXL97, Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.0410 (9)

Crystal data top

[Eu(NO₃)₃(H₂O)₄]·2H₂O	γ = 69.29 (1)°
M_r = 446.09	V = 621.79 (13) Å³
Triclinic, P1	Z = 2
a = 6.705 (1) Å	Mo Kα radiation
b = 9.140 (1) Å	µ = 5.13 mm⁻¹
c = 11.647 (1) Å	T = 173 K
α = 69.71 (1)°	0.41 × 0.39 × 0.28 mm
β = 88.94 (1)°

Data collection top

Siemens CCD three-circle diffractometer	3448 independent reflections
Absorption correction: empirical (using intensity measurements) (SADABS; Sheldrick, 1996)	3284 reflections with I > 2σ(I)
T_min = 0.148, T_max = 0.238	R_int = 0.022
12544 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.016	12 restraints
wR(F²) = 0.039	H atoms treated by a mixture of independent and constrained refinement
S = 1.13	Δρ_max = 1.42 e Å⁻³
3448 reflections	Δρ_min = −0.66 e Å⁻³
221 parameters

Special details top

Experimental. ;

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
Eu1	0.196332 (13)	0.405156 (11)	0.274408 (8)	0.01200 (5)
O1	0.3018 (2)	0.4421 (2)	0.07027 (14)	0.0193 (3)
H1A	0.403 (4)	0.365 (3)	0.058 (3)	0.037 (9)*
H1B	0.233 (4)	0.506 (3)	0.0013 (15)	0.033 (8)*
O2	0.5736 (2)	0.2364 (2)	0.32478 (17)	0.0234 (3)
H2A	0.664 (6)	0.281 (6)	0.309 (4)	0.082 (15)*
H2B	0.631 (5)	0.1361 (17)	0.371 (2)	0.031 (8)*
O3	0.3683 (3)	0.6031 (2)	0.22168 (14)	0.0237 (3)
H3A	0.364 (6)	0.671 (4)	0.1514 (16)	0.052 (11)*
H3B	0.384 (5)	0.657 (3)	0.263 (2)	0.031 (8)*
O4	0.2798 (3)	0.4476 (2)	0.45732 (14)	0.0197 (3)
H4A	0.361 (4)	0.370 (3)	0.518 (2)	0.034 (8)*
H4B	0.198 (4)	0.514 (3)	0.487 (3)	0.036 (8)*
O5	0.6242 (3)	0.2030 (2)	0.01593 (16)	0.0227 (3)
H5A	0.743 (3)	0.159 (5)	0.059 (3)	0.048 (11)*
H5B	0.582 (7)	0.127 (4)	0.020 (4)	0.071 (14)*
O6	0.4091 (3)	0.7789 (2)	0.36185 (15)	0.0206 (3)
H6A	0.294 (3)	0.825 (4)	0.387 (3)	0.036 (9)*
H6B	0.435 (5)	0.860 (3)	0.313 (3)	0.043 (10)*
N1	0.0829 (3)	0.1757 (2)	0.17886 (17)	0.0200 (3)
O11	−0.0578 (2)	0.3183 (2)	0.17037 (15)	0.0236 (3)
O12	0.2653 (3)	0.1373 (2)	0.23306 (16)	0.0271 (3)
O13	0.0423 (3)	0.0819 (2)	0.13757 (17)	0.0285 (4)
N2	0.0793 (3)	0.1669 (2)	0.50115 (17)	0.0186 (3)
O21	0.2703 (3)	0.1216 (2)	0.47951 (18)	0.0292 (4)
O22	−0.0522 (2)	0.3068 (2)	0.42717 (14)	0.0218 (3)
O23	0.0183 (3)	0.0802 (2)	0.59053 (16)	0.0284 (4)
N3	−0.1772 (3)	0.7254 (2)	0.18588 (17)	0.0182 (3)
O31	−0.1021 (3)	0.6489 (2)	0.29835 (14)	0.0255 (3)
O32	−0.0834 (3)	0.6566 (2)	0.11240 (15)	0.0262 (3)
O33	−0.3340 (3)	0.8580 (2)	0.15067 (16)	0.0270 (3)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Eu1	0.01176 (6)	0.01208 (6)	0.01045 (6)	−0.00380 (4)	0.00094 (3)	−0.00270 (4)
O1	0.0219 (7)	0.0204 (7)	0.0131 (7)	−0.0051 (6)	0.0030 (6)	−0.0062 (6)
O2	0.0140 (7)	0.0174 (8)	0.0323 (9)	−0.0033 (6)	−0.0021 (6)	−0.0040 (7)
O3	0.0396 (9)	0.0263 (8)	0.0146 (7)	−0.0228 (7)	0.0062 (6)	−0.0077 (7)
O4	0.0229 (7)	0.0196 (8)	0.0118 (7)	−0.0033 (6)	−0.0015 (5)	−0.0047 (6)
O5	0.0278 (8)	0.0189 (8)	0.0211 (8)	−0.0106 (6)	0.0033 (6)	−0.0050 (6)
O6	0.0234 (7)	0.0175 (7)	0.0189 (7)	−0.0069 (6)	0.0005 (6)	−0.0046 (6)
N1	0.0259 (9)	0.0177 (8)	0.0155 (8)	−0.0103 (7)	−0.0010 (7)	−0.0025 (7)
O11	0.0197 (7)	0.0240 (8)	0.0271 (8)	−0.0065 (6)	−0.0006 (6)	−0.0109 (7)
O12	0.0245 (8)	0.0170 (7)	0.0348 (9)	−0.0060 (6)	−0.0097 (7)	−0.0049 (7)
O13	0.0377 (9)	0.0229 (8)	0.0285 (9)	−0.0147 (7)	−0.0033 (7)	−0.0097 (7)
N2	0.0204 (8)	0.0160 (8)	0.0194 (9)	−0.0061 (7)	0.0048 (7)	−0.0070 (7)
O21	0.0179 (7)	0.0238 (8)	0.0419 (10)	−0.0044 (6)	0.0093 (7)	−0.0108 (8)
O22	0.0190 (7)	0.0192 (7)	0.0197 (7)	−0.0052 (6)	0.0010 (6)	−0.0004 (6)
O23	0.0351 (9)	0.0210 (8)	0.0219 (8)	−0.0098 (7)	0.0110 (7)	−0.0002 (7)
N3	0.0158 (7)	0.0130 (8)	0.0221 (9)	−0.0048 (6)	0.0023 (6)	−0.0026 (7)
O31	0.0271 (8)	0.0224 (8)	0.0148 (7)	0.0006 (6)	0.0028 (6)	−0.0024 (6)
O32	0.0275 (8)	0.0247 (8)	0.0181 (7)	0.0004 (6)	−0.0015 (6)	−0.0082 (6)
O33	0.0212 (7)	0.0144 (7)	0.0321 (9)	0.0003 (6)	0.0018 (6)	0.0000 (7)

Geometric parameters (Å, º) top

Eu1—O3	2.3787 (16)	O3—H3B	0.829 (10)
Eu1—O4	2.4029 (15)	O4—H4A	0.837 (10)
Eu1—O2	2.4063 (16)	O4—H4B	0.836 (10)
Eu1—O1	2.4118 (15)	O5—H5A	0.837 (10)
Eu1—O31	2.5105 (16)	O5—H5B	0.827 (10)
Eu1—O32	2.5364 (17)	O6—H6A	0.842 (10)
Eu1—O12	2.5396 (18)	O6—H6B	0.835 (10)
Eu1—O22	2.5671 (16)	N1—O13	1.223 (2)
Eu1—O11	2.5891 (16)	N1—O12	1.260 (2)
Eu1—O21	2.7407 (19)	N1—O11	1.282 (2)
Eu1—N3	2.9531 (18)	N2—O23	1.233 (2)
Eu1—N1	2.9988 (18)	N2—O21	1.249 (2)
O1—H1A	0.837 (10)	N2—O22	1.274 (2)
O1—H1B	0.835 (10)	N3—O33	1.229 (2)
O2—H2A	0.833 (10)	N3—O32	1.264 (2)
O2—H2B	0.834 (10)	N3—O31	1.264 (2)
O3—H3A	0.831 (10)

O3—Eu1—O4	71.13 (5)	O22—Eu1—N3	83.52 (5)
O3—Eu1—O2	75.47 (6)	O11—Eu1—N3	80.41 (5)
O4—Eu1—O2	78.48 (6)	O21—Eu1—N3	130.45 (5)
O3—Eu1—O1	71.16 (5)	O3—Eu1—N1	141.67 (5)
O4—Eu1—O1	140.04 (6)	O4—Eu1—N1	144.56 (5)
O2—Eu1—O1	79.82 (6)	O2—Eu1—N1	95.53 (5)
O3—Eu1—O31	81.24 (6)	O1—Eu1—N1	70.59 (5)
O4—Eu1—O31	69.50 (5)	O31—Eu1—N1	118.58 (6)
O2—Eu1—O31	145.10 (6)	O32—Eu1—N1	89.77 (5)
O1—Eu1—O31	116.70 (5)	O12—Eu1—N1	24.56 (5)
O3—Eu1—O32	78.54 (6)	O22—Eu1—N1	77.16 (5)
O4—Eu1—O32	115.56 (5)	O11—Eu1—N1	25.17 (5)
O2—Eu1—O32	144.17 (6)	O21—Eu1—N1	76.28 (5)
O1—Eu1—O32	68.63 (5)	N3—Eu1—N1	105.26 (5)
O31—Eu1—O32	50.31 (5)	Eu1—O1—H1A	120 (2)
O3—Eu1—O12	132.73 (6)	Eu1—O1—H1B	130 (2)
O4—Eu1—O12	130.94 (5)	H1A—O1—H1B	106 (3)
O2—Eu1—O12	71.26 (5)	Eu1—O2—H2A	120 (3)
O1—Eu1—O12	70.69 (6)	Eu1—O2—H2B	128 (2)
O31—Eu1—O12	141.74 (6)	H2A—O2—H2B	111 (4)
O32—Eu1—O12	111.56 (5)	Eu1—O3—H3A	126 (3)
O3—Eu1—O22	140.43 (5)	Eu1—O3—H3B	127 (2)
O4—Eu1—O22	74.67 (5)	H3A—O3—H3B	99 (3)
O2—Eu1—O22	116.43 (6)	Eu1—O4—H4A	122 (2)
O1—Eu1—O22	145.29 (5)	Eu1—O4—H4B	127 (2)
O31—Eu1—O22	68.47 (5)	H4A—O4—H4B	104 (3)
O32—Eu1—O22	99.31 (5)	H5A—O5—H5B	107 (4)
O12—Eu1—O22	85.27 (6)	H6A—O6—H6B	104 (3)
O3—Eu1—O11	139.30 (5)	O13—N1—O12	122.0 (2)
O4—Eu1—O11	144.49 (5)	O13—N1—O11	121.99 (19)
O2—Eu1—O11	120.55 (5)	O12—N1—O11	116.05 (18)
O1—Eu1—O11	75.35 (5)	O13—N1—Eu1	177.86 (16)
O31—Eu1—O11	94.01 (6)	O12—N1—Eu1	56.86 (11)
O32—Eu1—O11	68.05 (6)	O11—N1—Eu1	59.23 (10)
O12—Eu1—O11	49.71 (5)	N1—O11—Eu1	95.59 (11)
O22—Eu1—O11	69.98 (5)	N1—O12—Eu1	98.58 (13)
O3—Eu1—O21	130.44 (6)	O23—N2—O21	121.78 (19)
O4—Eu1—O21	68.94 (6)	O23—N2—O22	120.60 (18)
O2—Eu1—O21	68.88 (6)	O21—N2—O22	117.62 (18)
O1—Eu1—O21	131.34 (5)	O23—N2—Eu1	175.47 (14)
O31—Eu1—O21	110.12 (5)	O21—N2—Eu1	62.72 (11)
O32—Eu1—O21	146.13 (5)	O22—N2—Eu1	54.91 (10)
O12—Eu1—O21	64.53 (6)	N2—O21—Eu1	93.40 (12)
O22—Eu1—O21	47.84 (5)	N2—O22—Eu1	101.14 (12)
O11—Eu1—O21	89.30 (5)	O33—N3—O32	122.17 (18)
O3—Eu1—N3	78.76 (6)	O33—N3—O31	121.72 (19)
O4—Eu1—N3	92.52 (5)	O32—N3—O31	116.09 (17)
O2—Eu1—N3	154.22 (5)	O33—N3—Eu1	179.03 (15)
O1—Eu1—N3	92.71 (5)	O32—N3—Eu1	58.64 (10)
O31—Eu1—N3	25.12 (5)	O31—N3—Eu1	57.46 (10)
O32—Eu1—N3	25.19 (5)	N3—O31—Eu1	97.42 (12)
O12—Eu1—N3	129.61 (5)	N3—O32—Eu1	96.18 (11)

O3—Eu1—N1—O12	82.21 (15)	O3—Eu1—O21—N2	126.05 (12)
O4—Eu1—N1—O12	−69.16 (16)	O4—Eu1—O21—N2	87.64 (13)
O2—Eu1—N1—O12	8.71 (13)	O2—Eu1—O21—N2	173.01 (14)
O1—Eu1—N1—O12	85.86 (13)	O1—Eu1—O21—N2	−133.32 (12)
O31—Eu1—N1—O12	−163.62 (12)	O31—Eu1—O21—N2	30.36 (14)
O32—Eu1—N1—O12	153.22 (13)	O32—Eu1—O21—N2	−17.20 (18)
O22—Eu1—N1—O12	−107.18 (13)	O12—Eu1—O21—N2	−108.39 (14)
O11—Eu1—N1—O12	−177.3 (2)	O22—Eu1—O21—N2	−0.44 (11)
O21—Eu1—N1—O12	−57.95 (13)	O11—Eu1—O21—N2	−63.66 (13)
N3—Eu1—N1—O12	173.32 (13)	N3—Eu1—O21—N2	13.08 (16)
O3—Eu1—N1—O11	−100.51 (14)	N1—Eu1—O21—N2	−85.42 (13)
O4—Eu1—N1—O11	108.12 (13)	O23—N2—O22—Eu1	179.29 (17)
O2—Eu1—N1—O11	−174.01 (12)	O21—N2—O22—Eu1	−0.8 (2)
O1—Eu1—N1—O11	−96.87 (12)	O3—Eu1—O22—N2	−105.69 (14)
O31—Eu1—N1—O11	13.66 (13)	O4—Eu1—O22—N2	−74.82 (12)
O32—Eu1—N1—O11	−29.50 (12)	O2—Eu1—O22—N2	−6.38 (14)
O12—Eu1—N1—O11	177.3 (2)	O1—Eu1—O22—N2	105.39 (13)
O22—Eu1—N1—O11	70.10 (12)	O31—Eu1—O22—N2	−148.43 (13)
O21—Eu1—N1—O11	119.33 (12)	O32—Eu1—O22—N2	171.07 (12)
N3—Eu1—N1—O11	−9.40 (13)	O12—Eu1—O22—N2	59.97 (12)
O13—N1—O11—Eu1	−177.95 (18)	O11—Eu1—O22—N2	108.64 (13)
O12—N1—O11—Eu1	2.54 (19)	O21—Eu1—O22—N2	0.44 (11)
O3—Eu1—O11—N1	110.77 (13)	N3—Eu1—O22—N2	−169.24 (13)
O4—Eu1—O11—N1	−108.40 (13)	N1—Eu1—O22—N2	83.45 (12)
O2—Eu1—O11—N1	6.93 (14)	O3—Eu1—N3—O32	86.93 (13)
O1—Eu1—O11—N1	75.43 (12)	O4—Eu1—N3—O32	157.12 (13)
O31—Eu1—O11—N1	−168.00 (12)	O2—Eu1—N3—O32	88.74 (18)
O32—Eu1—O11—N1	147.93 (13)	O1—Eu1—N3—O32	16.75 (13)
O12—Eu1—O11—N1	−1.48 (11)	O31—Eu1—N3—O32	−179.7 (2)
O22—Eu1—O11—N1	−102.66 (12)	O12—Eu1—N3—O32	−50.26 (15)
O21—Eu1—O11—N1	−57.89 (12)	O22—Eu1—N3—O32	−128.62 (13)
N3—Eu1—O11—N1	170.80 (12)	O11—Eu1—N3—O32	−57.90 (13)
O13—N1—O12—Eu1	177.88 (18)	O21—Eu1—N3—O32	−138.67 (12)
O11—N1—O12—Eu1	−2.60 (19)	N1—Eu1—N3—O32	−53.86 (13)
O3—Eu1—O12—N1	−123.22 (13)	O3—Eu1—N3—O31	−93.33 (13)
O4—Eu1—O12—N1	134.16 (12)	O4—Eu1—N3—O31	−23.14 (13)
O2—Eu1—O12—N1	−170.84 (14)	O2—Eu1—N3—O31	−91.52 (18)
O1—Eu1—O12—N1	−85.37 (13)	O1—Eu1—N3—O31	−163.51 (13)
O31—Eu1—O12—N1	23.58 (17)	O32—Eu1—N3—O31	179.7 (2)
O32—Eu1—O12—N1	−28.98 (14)	O12—Eu1—N3—O31	129.48 (13)
O22—Eu1—O12—N1	69.18 (13)	O22—Eu1—N3—O31	51.12 (13)
O11—Eu1—O12—N1	1.52 (11)	O11—Eu1—N3—O31	121.84 (13)
O21—Eu1—O12—N1	114.22 (14)	O21—Eu1—N3—O31	41.07 (15)
N3—Eu1—O12—N1	−8.38 (16)	N1—Eu1—N3—O31	125.88 (13)
O3—Eu1—N2—O21	−76.58 (15)	O33—N3—O31—Eu1	179.38 (17)
O4—Eu1—N2—O21	−83.25 (13)	O32—N3—O31—Eu1	0.25 (19)
O2—Eu1—N2—O21	−6.53 (13)	O3—Eu1—O31—N3	82.19 (13)
O1—Eu1—N2—O21	69.57 (16)	O4—Eu1—O31—N3	155.22 (14)
O31—Eu1—N2—O21	−151.66 (13)	O2—Eu1—O31—N3	130.54 (13)
O32—Eu1—N2—O21	168.68 (12)	O1—Eu1—O31—N3	18.50 (14)
O12—Eu1—N2—O21	63.11 (13)	O32—Eu1—O31—N3	−0.14 (11)
O22—Eu1—N2—O21	179.2 (2)	O12—Eu1—O31—N3	−73.80 (15)
O11—Eu1—N2—O21	114.10 (13)	O22—Eu1—O31—N3	−123.75 (13)
N3—Eu1—N2—O21	−169.62 (12)	O11—Eu1—O31—N3	−57.11 (13)
N1—Eu1—N2—O21	88.51 (13)	O21—Eu1—O31—N3	−147.83 (12)
O3—Eu1—N2—O22	104.23 (14)	N1—Eu1—O31—N3	−62.89 (14)
O4—Eu1—N2—O22	97.56 (13)	O33—N3—O32—Eu1	−179.37 (17)
O2—Eu1—N2—O22	174.28 (13)	O31—N3—O32—Eu1	−0.24 (19)
O1—Eu1—N2—O22	−109.61 (13)	O3—Eu1—O32—N3	−87.93 (13)
O31—Eu1—N2—O22	29.15 (12)	O4—Eu1—O32—N3	−25.50 (14)
O32—Eu1—N2—O22	−10.51 (14)	O2—Eu1—O32—N3	−132.03 (12)
O12—Eu1—N2—O22	−116.08 (13)	O1—Eu1—O32—N3	−161.99 (14)
O11—Eu1—N2—O22	−65.09 (12)	O31—Eu1—O32—N3	0.14 (11)
O21—Eu1—N2—O22	−179.2 (2)	O12—Eu1—O32—N3	140.44 (12)
N3—Eu1—N2—O22	11.19 (13)	O22—Eu1—O32—N3	51.87 (13)
N1—Eu1—N2—O22	−90.68 (13)	O11—Eu1—O32—N3	115.77 (13)
O23—N2—O21—Eu1	−179.36 (18)	O21—Eu1—O32—N3	64.38 (16)
O22—N2—O21—Eu1	0.75 (19)	N1—Eu1—O32—N3	128.82 (13)

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1A···O5	0.84 (1)	1.89 (1)	2.723 (2)	175 (3)
O1—H1B···O11ⁱ	0.84 (1)	2.12 (1)	2.951 (2)	176 (3)
O2—H2A···O11ⁱⁱ	0.83 (1)	2.48 (3)	3.180 (2)	143 (4)
O2—H2A···O22ⁱⁱ	0.83 (1)	2.49 (3)	3.149 (2)	137 (4)
O2—H2B···O21ⁱⁱⁱ	0.83 (1)	2.26 (1)	3.081 (2)	168 (3)
O2—H2B···O23ⁱⁱⁱ	0.83 (1)	2.40 (2)	3.058 (2)	136 (3)
O3—H3A···O5^iv	0.83 (1)	1.91 (1)	2.731 (2)	171 (4)
O3—H3B···O6	0.83 (1)	1.90 (1)	2.733 (2)	177 (3)
O4—H4A···O6^v	0.84 (1)	1.86 (1)	2.675 (2)	165 (3)
O4—H4B···O22^vi	0.84 (1)	2.14 (1)	2.962 (2)	167 (3)
O5—H5A···O13ⁱⁱ	0.84 (1)	1.99 (1)	2.821 (3)	170 (4)
O5—H5B···O33^vii	0.83 (1)	2.26 (3)	2.906 (2)	135 (4)
O5—H5B···O33ⁱ	0.83 (1)	2.55 (4)	3.085 (3)	124 (4)
O6—H6A···O23^vi	0.84 (1)	2.01 (1)	2.829 (2)	163 (3)
O6—H6B···O12^viii	0.84 (1)	2.23 (3)	2.885 (2)	136 (3)
O6—H6B···O33ⁱⁱ	0.84 (1)	2.42 (3)	3.005 (2)	128 (3)

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

Experimental details

Crystal data
Chemical formula	[Eu(NO₃)₃(H₂O)₄]·2H₂O
M_r	446.09
Crystal system, space group	Triclinic, P1
Temperature (K)	173
a, b, c (Å)	6.705 (1), 9.140 (1), 11.647 (1)
α, β, γ (°)	69.71 (1), 88.94 (1), 69.29 (1)
V (Å³)	621.79 (13)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	5.13
Crystal size (mm)	0.41 × 0.39 × 0.28

Data collection
Diffractometer	Siemens CCD three-circle diffractometer
Absorption correction	Empirical (using intensity measurements) (SADABS; Sheldrick, 1996)
T_min, T_max	0.148, 0.238
No. of measured, independent and observed [I > 2σ(I)] reflections	12544, 3448, 3284
R_int	0.022
(sin θ/λ)_max (Å⁻¹)	0.723

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.016, 0.039, 1.13
No. of reflections	3448
No. of parameters	221
No. of restraints	12
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	1.42, −0.66

Computer programs: SMART (Siemens, 1995), SMART, SAINT (Siemens, 1995), SHELXS97 (Sheldrick, 1990), SHELXL97 (Sheldrick, 1997), XP in SHELXTL-Plus (Sheldrick, 1991), SHELXL97.

Selected bond lengths (Å) top

Eu1—O3	2.3787 (16)	Eu1—O32	2.5364 (17)
Eu1—O4	2.4029 (15)	Eu1—O12	2.5396 (18)
Eu1—O2	2.4063 (16)	Eu1—O22	2.5671 (16)
Eu1—O1	2.4118 (15)	Eu1—O11	2.5891 (16)
Eu1—O31	2.5105 (16)	Eu1—O21	2.7407 (19)