Di-μ-oxido-bis­({2,2′-[propane-1,3-diyl­bis(nitrilo­methyl­idyne)]diphenolato}vanadium(IV)) dimethyl­formamide disolvate

Liu, Y.; Dou, J.; Niu, M.; Zhang, X.

doi:10.1107/S1600536807049987

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Di-μ-oxido-bis({2,2′-[propane-1,3-diylbis(nitrilomethylidyne)]diphenolato}vanadium(IV)) dimethylformamide disolvate

Y. Liu, J. Dou, M. Niu and X. Zhang

In the title compound, [V₂(C₁₇H₁₇N₂O₂)₂O₂]·2C₃H₇NO, each V atom is chelated by a Schiff base ligand via two N and two O atoms. The two octahedrally coordinated V atoms are linked by two bridging oxide ligands to give a centrosymmetric dimer.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807049987/cf2153sup1.cif Contains datablocks global, I
	Structure factor file (CIF format) https://doi.org/10.1107/S1600536807049987/cf2153Isup2.hkl Contains datablock I

CCDC reference: 667162

checkCIF report

Key indicators

Single-crystal X-ray study
T = 293 K
Mean (C-C) = 0.004 Å
R factor = 0.044
wR factor = 0.133
Data-to-parameter ratio = 12.9

checkCIF/PLATON results

No syntax errors found



Alert level C
PLAT029_ALERT_3_C _diffrn_measured_fraction_theta_full Low .......       0.98
PLAT042_ALERT_1_C Calc. and Rep. MoietyFormula Strings Differ ....          ?
PLAT094_ALERT_2_C Ratio of Maximum / Minimum Residual Density ....       3.06
PLAT232_ALERT_2_C Hirshfeld Test Diff (M-X)  V1     -   O1      ..       5.08 su
PLAT232_ALERT_2_C Hirshfeld Test Diff (M-X)  V1     -   N2      ..       6.00 su
PLAT380_ALERT_4_C Check Incorrectly? Oriented X(sp2)-Methyl Moiety        C19
PLAT380_ALERT_4_C Check Incorrectly? Oriented X(sp2)-Methyl Moiety        C20

Alert level G
FORMU01_ALERT_1_G  There is a discrepancy between the atom counts in the
            _chemical_formula_sum and _chemical_formula_moiety. This is
            usually due to the moiety formula being in the wrong format.
            Atom count from _chemical_formula_sum:   C40 H46 N6 O8 V2
            Atom count from _chemical_formula_moiety:C40 H48 N6 O8 V2
PLAT199_ALERT_1_G Check the Reported _cell_measurement_temperature        293 K
PLAT200_ALERT_1_G Check the Reported _diffrn_ambient_temperature .        293 K
PLAT794_ALERT_5_G Check Predicted Bond Valency for V1          (4)       4.40

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
   7 ALERT level C = Check and explain
   4 ALERT level G = General alerts; check

   4 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   3 ALERT type 2 Indicator that the structure model may be wrong or deficient
   1 ALERT type 3 Indicator that the structure quality may be low
   2 ALERT type 4 Improvement, methodology, query or suggestion
   1 ALERT type 5 Informative message, check

Comment top

Schiff base ligands have been studied for a long time due to their easy synthesis and versatile complexing properties. They play an important role in the development of coordination chemistry as well as inorganic biochemistry, catalysis, optical materials etc. (Garnovskii et al., 1993; Huang et al., 2002). The richness and importance of vanadate chemistry (Gresser & Tracey, 1986; Posner et al., 1994) have aroused our particular interest in designing new vanadium complexes with ONNO-donor ligands. In this paper, we report the structure of the title compound, (I).

As shown in Fig. 1, each V atom is chelated by a Schiff base ligand via two N and two O atoms. The two octahedrally coordinated V atoms are linked by two bridging oxide ligands to give a centrosymmetric dimer. The V—N and V—O bond lengths are in the ranges 2.028 (2)–2.078 (2) and 1.8187 (18)–1.9364 (19) %A, respectively.

Related literature top

For related literature, see: Garnovskii et al. (1993); Gresser & Tracey (1986); Huang et al. (2002); Posner et al. (1994).

Experimental top

A mixture of vanadium(IV) sulfate (1 mmol) and N,N'-bis(2-hydroxybenzyl)-1,3-propanediamine (1 mmol) in 20 ml me thanol was refluxed for two hours. The above solution was filtered and the filtrate was allowed to evaporate naturally at room temperature. Two days later, blue blocks of (I) were obtained with a yield of 16%. Anal. calc. for C₄₀H₄₆V₂N₆O₈: C 56.56, H 5.42, N 6.60%; found: C 56.52, H 5.44, N 6.51%.

Structure description top

For related literature, see: Garnovskii et al. (1993); Gresser & Tracey (1986); Huang et al. (2002); Posner et al. (1994).

Computing details top

Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus (Bruker, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 2001); software used to prepare material for publication: SHELXTL (Bruker, 2001).

Figures top

Fig. 1. The molecular structure of (I), drawn with 30% probability displacement ellipsoids for the non-hydrogen atoms. [Symmetry code for unlabelled atoms: -x + 1, -y + 1, -z.]

Di-µ-oxido-bis({2,2'-[propane-1,3- diylbis(nitrilomethylidyne)]diphenolato}vanadium(IV)) dimethylformamide disolvate top

Crystal data top

[V₂(C₁₇H₁₇N₂O₂)₂O₂]·2C₃H₇NO	F(000) = 876
M_r = 840.71	D_x = 1.467 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 3265 reflections
a = 10.9161 (5) Å	θ = 3.1–25.0°
b = 9.9986 (5) Å	µ = 0.55 mm⁻¹
c = 17.7812 (10) Å	T = 293 K
β = 101.291 (2)°	Block, blue
V = 1903.18 (17) Å³	0.43 × 0.28 × 0.22 mm
Z = 2

Data collection top

Bruker APEXII CCD area-detector diffractometer	3265 independent reflections
Radiation source: fine-focus sealed tube	2841 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.032
φ and ω scans	θ_max = 25.0°, θ_min = 3.1°
Absorption correction: multi-scan (SADABS; Bruker, 2001)	h = −12→12
T_min = 0.797, T_max = 0.888	k = −11→11
10745 measured reflections	l = −20→20

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)] = 0.044	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.134	H-atom parameters not refined
S = 1.00	w = 1/[σ²(F_o²) + (0.089P)² + 1.6075P] where P = (F_o² + 2F_c²)/3
3265 reflections	(Δ/σ)_max < 0.001
253 parameters	Δρ_max = 0.95 e Å⁻³
0 restraints	Δρ_min = −0.31 e Å⁻³

Crystal data top

[V₂(C₁₇H₁₇N₂O₂)₂O₂]·2C₃H₇NO	V = 1903.18 (17) Å³
M_r = 840.71	Z = 2
Monoclinic, P2₁/c	Mo Kα radiation
a = 10.9161 (5) Å	µ = 0.55 mm⁻¹
b = 9.9986 (5) Å	T = 293 K
c = 17.7812 (10) Å	0.43 × 0.28 × 0.22 mm
β = 101.291 (2)°

Data collection top

Bruker APEXII CCD area-detector diffractometer	3265 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2001)	2841 reflections with I > 2σ(I)
T_min = 0.797, T_max = 0.888	R_int = 0.032
10745 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.044	0 restraints
wR(F²) = 0.134	H-atom parameters not refined
S = 1.00	Δρ_max = 0.95 e Å⁻³
3265 reflections	Δρ_min = −0.31 e Å⁻³
253 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
V1	0.50502 (3)	0.37734 (4)	0.03285 (2)	0.0161 (4)
O1	0.54652 (17)	0.43578 (18)	0.13786 (10)	0.0216 (4)
O2	0.63819 (17)	0.24749 (18)	0.05886 (11)	0.0231 (4)
N2	0.4575 (2)	0.2833 (2)	−0.06976 (13)	0.0201 (5)
C17	0.7134 (2)	0.2146 (2)	0.01051 (16)	0.0214 (6)
N1	0.3655 (2)	0.2627 (2)	0.06550 (13)	0.0211 (5)
C11	0.5372 (3)	0.2249 (2)	−0.10443 (15)	0.0214 (6)
H11A	0.5080	0.1932	−0.1539	0.026*
C16	0.8407 (3)	0.1822 (3)	0.04046 (16)	0.0242 (6)
H16A	0.8714	0.1874	0.0930	0.029*
C10	0.3227 (3)	0.2801 (3)	−0.10458 (16)	0.0245 (6)
H10A	0.3121	0.2555	−0.1582	0.029*
H10B	0.2871	0.3684	−0.1017	0.029*
C5	0.2591 (3)	0.4421 (3)	0.22177 (16)	0.0276 (6)
H5A	0.1824	0.3990	0.2169	0.033*
C7	0.3077 (2)	0.2952 (3)	0.12027 (16)	0.0233 (6)
H7A	0.2386	0.2444	0.1258	0.028*
C1	0.4629 (2)	0.4667 (3)	0.18088 (14)	0.0201 (6)
C8	0.3227 (3)	0.1436 (3)	0.01943 (17)	0.0268 (6)
H8A	0.2677	0.0922	0.0451	0.032*
H8B	0.3944	0.0881	0.0161	0.032*
C15	0.9199 (3)	0.1426 (3)	−0.00830 (18)	0.0276 (6)
H15A	1.0029	0.1229	0.0124	0.033*
C9	0.2529 (3)	0.1782 (3)	−0.06243 (17)	0.0311 (7)
H9A	0.1715	0.2144	−0.0596	0.037*
H9B	0.2397	0.0965	−0.0924	0.037*
C2	0.4954 (3)	0.5621 (3)	0.24014 (16)	0.0256 (6)
H2A	0.5749	0.5997	0.2493	0.031*
C6	0.3432 (3)	0.4046 (3)	0.17318 (16)	0.0224 (6)
C4	0.2908 (3)	0.5423 (3)	0.27629 (16)	0.0285 (6)
H4A	0.2345	0.5701	0.3062	0.034*
C12	0.6699 (3)	0.2055 (3)	−0.07122 (16)	0.0226 (6)
C14	0.8766 (3)	0.1315 (3)	−0.08890 (19)	0.0320 (7)
H14A	0.9301	0.1044	−0.1207	0.038*
C13	0.7522 (3)	0.1622 (3)	−0.11906 (17)	0.0266 (6)
H13A	0.7224	0.1542	−0.1716	0.032*
C3	0.4097 (3)	0.6008 (3)	0.28523 (17)	0.0285 (7)
H3A	0.4321	0.6670	0.3221	0.034*
N3	0.9330 (2)	0.5321 (3)	0.16965 (14)	0.0329 (6)
O4	0.9442 (2)	0.6587 (3)	0.27878 (13)	0.0459 (6)
C18	0.9720 (3)	0.6352 (3)	0.2145 (2)	0.0376 (8)
H18A	1.0246	0.6960	0.1970	0.045*
C19	0.8517 (3)	0.4318 (3)	0.1944 (2)	0.0375 (7)
H19A	0.8365	0.4553	0.2441	0.056*
H19B	0.8913	0.3458	0.1969	0.056*
H19C	0.7737	0.4286	0.1584	0.056*
C20	0.9680 (3)	0.5130 (4)	0.09462 (19)	0.0442 (8)
H20A	1.0212	0.5850	0.0852	0.066*
H20B	0.8941	0.5118	0.0552	0.066*
H20C	1.0117	0.4296	0.0944	0.066*
O3	0.39013 (16)	0.50834 (18)	0.00318 (10)	0.0204 (4)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
V1	0.0171 (9)	0.0190 (9)	0.0131 (9)	0.0006 (7)	0.0049 (7)	−0.0003 (7)
O1	0.0235 (10)	0.0223 (10)	0.0197 (10)	0.0004 (7)	0.0059 (8)	0.0003 (8)
O2	0.0258 (10)	0.0210 (9)	0.0236 (10)	0.0038 (7)	0.0076 (8)	0.0012 (8)
N2	0.0218 (11)	0.0163 (11)	0.0228 (12)	−0.0016 (8)	0.0059 (9)	0.0018 (9)
C17	0.0253 (14)	0.0131 (12)	0.0271 (15)	0.0006 (10)	0.0087 (11)	0.0021 (10)
N1	0.0228 (11)	0.0200 (11)	0.0208 (12)	0.0006 (9)	0.0052 (9)	0.0010 (9)
C11	0.0314 (15)	0.0155 (12)	0.0183 (14)	−0.0023 (10)	0.0074 (11)	−0.0001 (10)
C16	0.0273 (15)	0.0199 (14)	0.0264 (15)	−0.0009 (11)	0.0074 (12)	0.0025 (11)
C10	0.0254 (14)	0.0231 (14)	0.0245 (15)	−0.0036 (11)	0.0034 (11)	−0.0032 (11)
C5	0.0294 (15)	0.0291 (15)	0.0267 (15)	0.0021 (12)	0.0114 (12)	0.0026 (12)
C7	0.0209 (13)	0.0214 (14)	0.0286 (15)	0.0013 (10)	0.0069 (11)	0.0046 (11)
C1	0.0235 (13)	0.0206 (13)	0.0165 (13)	0.0042 (10)	0.0048 (10)	0.0038 (10)
C8	0.0273 (15)	0.0190 (13)	0.0362 (17)	−0.0053 (11)	0.0119 (13)	−0.0014 (12)
C15	0.0209 (14)	0.0243 (14)	0.0385 (18)	0.0026 (11)	0.0077 (12)	0.0030 (13)
C9	0.0320 (16)	0.0331 (16)	0.0292 (17)	−0.0111 (13)	0.0085 (13)	−0.0065 (13)
C2	0.0312 (15)	0.0225 (14)	0.0235 (15)	−0.0021 (11)	0.0068 (12)	−0.0002 (12)
C6	0.0242 (14)	0.0210 (13)	0.0224 (15)	0.0034 (11)	0.0059 (11)	0.0028 (11)
C4	0.0340 (16)	0.0300 (15)	0.0245 (16)	0.0068 (12)	0.0128 (12)	0.0022 (12)
C12	0.0288 (15)	0.0150 (13)	0.0257 (15)	0.0005 (10)	0.0092 (12)	0.0015 (11)
C14	0.0297 (16)	0.0296 (16)	0.0423 (19)	0.0030 (12)	0.0205 (14)	0.0019 (13)
C13	0.0324 (16)	0.0236 (14)	0.0254 (15)	0.0011 (12)	0.0097 (12)	0.0006 (12)
C3	0.0391 (17)	0.0245 (14)	0.0225 (16)	0.0021 (12)	0.0078 (13)	−0.0017 (11)
N3	0.0333 (14)	0.0319 (14)	0.0324 (15)	0.0003 (11)	0.0037 (11)	0.0008 (11)
O4	0.0515 (15)	0.0464 (14)	0.0384 (14)	−0.0017 (11)	0.0051 (11)	−0.0102 (11)
C18	0.0338 (17)	0.0344 (18)	0.043 (2)	−0.0042 (13)	0.0033 (15)	−0.0017 (14)
C19	0.0357 (17)	0.0321 (17)	0.044 (2)	−0.0005 (13)	0.0068 (14)	0.0001 (14)
C20	0.048 (2)	0.043 (2)	0.042 (2)	−0.0009 (16)	0.0111 (16)	−0.0048 (16)
O3	0.0210 (10)	0.0190 (9)	0.0217 (10)	0.0001 (7)	0.0053 (7)	0.0007 (8)

Geometric parameters (Å, º) top

V1—O3	1.8187 (18)	C8—C9	1.544 (4)
V1—O3ⁱ	1.8204 (17)	C8—H8A	0.970
V1—O1	1.9240 (18)	C8—H8B	0.970
V1—O2	1.9364 (19)	C15—C14	1.423 (5)
V1—N2	2.028 (2)	C15—H15A	0.930
V1—N1	2.078 (2)	C9—H9A	0.970
V1—V1ⁱ	2.7098 (7)	C9—H9B	0.970
O1—C1	1.337 (3)	C2—C3	1.401 (4)
O2—C17	1.340 (3)	C2—H2A	0.930
N2—C11	1.299 (3)	C4—C3	1.403 (4)
N2—C10	1.481 (3)	C4—H4A	0.930
C17—C16	1.425 (4)	C12—C13	1.420 (4)
C17—C12	1.441 (4)	C14—C13	1.393 (4)
N1—C7	1.301 (3)	C14—H14A	0.930
N1—C8	1.468 (3)	C13—H13A	0.930
C11—C12	1.467 (4)	C3—H3A	0.930
C11—H11A	0.930	N3—C18	1.322 (4)
C16—C15	1.396 (4)	N3—C19	1.463 (4)
C16—H16A	0.930	N3—C20	1.470 (4)
C10—C9	1.550 (4)	O4—C18	1.261 (4)
C10—H10A	0.970	C18—H18A	0.930
C10—H10B	0.970	C19—H19A	0.960
C5—C4	1.391 (4)	C19—H19B	0.960
C5—C6	1.428 (4)	C19—H19C	0.960
C5—H5A	0.930	C20—H20A	0.960
C7—C6	1.446 (4)	C20—H20B	0.960
C7—H7A	0.930	C20—H20C	0.960
C1—C2	1.414 (4)	O3—V1ⁱ	1.8204 (17)
C1—C6	1.430 (4)

O3—V1—O3ⁱ	83.74 (8)	N1—C8—H8A	109.0
O3—V1—O1	94.64 (8)	C9—C8—H8A	109.0
O3ⁱ—V1—O1	96.08 (8)	N1—C8—H8B	109.0
O3—V1—O2	174.25 (8)	C9—C8—H8B	109.0
O3ⁱ—V1—O2	90.61 (8)	H8A—C8—H8B	107.8
O1—V1—O2	87.06 (8)	C16—C15—C14	121.6 (3)
O3—V1—N2	91.86 (8)	C16—C15—H15A	119.2
O3ⁱ—V1—N2	92.43 (8)	C14—C15—H15A	119.2
O1—V1—N2	169.80 (8)	C8—C9—C10	113.9 (2)
O2—V1—N2	87.24 (8)	C8—C9—H9A	108.8
O3—V1—N1	88.68 (8)	C10—C9—H9A	108.8
O3ⁱ—V1—N1	172.10 (8)	C8—C9—H9B	108.8
O1—V1—N1	86.71 (8)	C10—C9—H9B	108.8
O2—V1—N1	96.92 (8)	H9A—C9—H9B	107.7
N2—V1—N1	85.58 (9)	C3—C2—C1	120.9 (3)
O3—V1—V1ⁱ	41.90 (5)	C3—C2—H2A	119.5
O3ⁱ—V1—V1ⁱ	41.85 (6)	C1—C2—H2A	119.5
O1—V1—V1ⁱ	97.21 (6)	C5—C6—C1	120.8 (3)
O2—V1—V1ⁱ	132.45 (6)	C5—C6—C7	118.1 (2)
N2—V1—V1ⁱ	92.88 (6)	C1—C6—C7	121.0 (2)
N1—V1—V1ⁱ	130.54 (7)	C5—C4—C3	118.6 (3)
C1—O1—V1	124.62 (16)	C5—C4—H4A	120.7
C17—O2—V1	122.43 (17)	C3—C4—H4A	120.7
C11—N2—C10	119.7 (2)	C13—C12—C17	120.1 (3)
C11—N2—V1	123.91 (19)	C13—C12—C11	119.3 (3)
C10—N2—V1	116.40 (16)	C17—C12—C11	120.1 (2)
O2—C17—C16	119.4 (2)	C13—C14—C15	118.5 (3)
O2—C17—C12	122.7 (2)	C13—C14—H14A	120.8
C16—C17—C12	117.8 (2)	C15—C14—H14A	120.8
C7—N1—C8	118.2 (2)	C14—C13—C12	121.3 (3)
C7—N1—V1	124.11 (19)	C14—C13—H13A	119.3
C8—N1—V1	117.49 (16)	C12—C13—H13A	119.3
N2—C11—C12	124.7 (2)	C2—C3—C4	121.8 (3)
N2—C11—H11A	117.7	C2—C3—H3A	119.1
C12—C11—H11A	117.7	C4—C3—H3A	119.1
C15—C16—C17	120.6 (3)	C18—N3—C19	119.7 (3)
C15—C16—H16A	119.7	C18—N3—C20	122.6 (3)
C17—C16—H16A	119.7	C19—N3—C20	117.7 (3)
N2—C10—C9	110.7 (2)	O4—C18—N3	125.9 (3)
N2—C10—H10A	109.5	O4—C18—H18A	117.0
C9—C10—H10A	109.5	N3—C18—H18A	117.0
N2—C10—H10B	109.5	N3—C19—H19A	109.5
C9—C10—H10B	109.5	N3—C19—H19B	109.5
H10A—C10—H10B	108.1	H19A—C19—H19B	109.5
C4—C5—C6	120.6 (3)	N3—C19—H19C	109.5
C4—C5—H5A	119.7	H19A—C19—H19C	109.5
C6—C5—H5A	119.7	H19B—C19—H19C	109.5
N1—C7—C6	124.7 (2)	N3—C20—H20A	109.5
N1—C7—H7A	117.7	N3—C20—H20B	109.5
C6—C7—H7A	117.7	H20A—C20—H20B	109.5
O1—C1—C2	118.8 (2)	N3—C20—H20C	109.5
O1—C1—C6	123.9 (2)	H20A—C20—H20C	109.5
C2—C1—C6	117.1 (2)	H20B—C20—H20C	109.5
N1—C8—C9	112.9 (2)	V1—O3—V1ⁱ	96.26 (8)

Symmetry code: (i) −x+1, −y+1, −z.

Experimental details

Crystal data
Chemical formula	[V₂(C₁₇H₁₇N₂O₂)₂O₂]·2C₃H₇NO
M_r	840.71
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	293
a, b, c (Å)	10.9161 (5), 9.9986 (5), 17.7812 (10)
β (°)	101.291 (2)
V (Å³)	1903.18 (17)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	0.55
Crystal size (mm)	0.43 × 0.28 × 0.22

Data collection
Diffractometer	Bruker APEXII CCD area-detector
Absorption correction	Multi-scan (SADABS; Bruker, 2001)
T_min, T_max	0.797, 0.888
No. of measured, independent and observed [I > 2σ(I)] reflections	10745, 3265, 2841
R_int	0.032
(sin θ/λ)_max (Å⁻¹)	0.595

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.044, 0.134, 1.00
No. of reflections	3265
No. of parameters	253
H-atom treatment	H-atom parameters not refined
Δρ_max, Δρ_min (e Å⁻³)	0.95, −0.31

Computer programs: APEX2 (Bruker, 2004), SAINT-Plus (Bruker, 2001), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), SHELXTL (Bruker, 2001).

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