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Acta Cryst. (2008). E64, m63    [ doi:10.1107/S1600536807063143 ]

[mu]-Oxido-bis({4,4'-dibromo-2,2'-ethane-1,2-diylbis(nitrilomethylidyne)]diphenolato}iron(III))

Q. Meng, L. Wang, Y. Liu and Y. Pang

Abstract top

In the title compound, [Fe2(C16H12Br2N2O2)2O], the complete molecule is generated by twofold symmetry, with the bridging O atom, which links the iron centres, lying on the roatation rotation axis. The Fe(III) ion is chelated by the N,N,O,O-tetradentate Schiff base dianion, resulting in an FeN2O3 square-based pyramid, with the two N atoms in the basal plane.

Comment top

Recently, Schiff base ligands, especially flexible symmetrical or unsymmetrical Schiff base ligands and their hydrogenated derivatives have been widely employed to assembly alkoxo- or phenoxo-bridged manganese clusters and polymers with novel topological structures and interesting magnetic, catalysis and photochemical properties. (Karacan & Somer, 2004; Chen et al., 2006). In this paper, we report the structure of the title compound, (I).

As shown in Fig. 1, the Fe(III) ion in (I) is chelated by the dianionic Schiff base ligand in a tetradentate N,N,O,O coordination in an approximately square planar arrangement. An oxo ligand (site symmetry 2) caps the FeN2O2 grouping to result in a square based pyramid. The oxo ligand also bridges to a second, crystallographically generated Fe atom. The Fe—O capping distance is much shorter than the other bonds (Table 1). The Fe···Fei (i = -x, y, 1/2 - z) distance is 3.4066 (12) %A.

Related literature top

For related literature, see: Karacan & Somer (2004); Chen et al. (2006).

Experimental top

A mixture of iron(III) chloride (1 mmol) and N,N'-bis(2-hydroxy-5-bromobenzyl)ethylenediamine (1 mmol) in 20 ml me thanol was refluxed for two hours. The above cooled solution was filterated and the filtrate was evaporated naturally at room temperature. Two days later, brown blocks of (I) were obtained with a yield of 32%. Anal. Calc. for C32H24Br4Fe2N4O5: C 39.34, H 2.46, N 5.74%; Found: C 39.32, H 2.48, N 5.69%.

Refinement top

The H atoms were included in calculated positions (C—H = 0.93–0.97 Å) and refined as riding with Uiso(H) = 1.2Ueq(C) or 1.5Ueq(methyl C).

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
[Figure 1] Fig. 1. The molecular structure of (I), drawn with 50% probability displacement ellipsoids for the non-hydrogen atoms. Symmetry code: (i) -x, y, 1/2 - z.
µ-Oxido-bis({4,4'-dibromo-2,2'-ethane-1,2- diylbis(nitrilomethylidyne)]diphenolato}iron(III)) top
Crystal data top
[Fe2(C16H12Br2N2O2)2O]F000 = 1904
Mr = 975.89Dx = 1.859 Mg m−3
Orthorhombic, PccaMo Kα radiation
λ = 0.71073 Å
Hall symbol: -P 2a 2acCell parameters from 3182 reflections
a = 21.094 (2) Åθ = 3.0–25.4º
b = 13.8168 (18) ŵ = 5.46 mm−1
c = 11.9619 (12) ÅT = 293 (2) K
V = 3486.3 (7) Å3Block, brown
Z = 40.43 × 0.28 × 0.22 mm
Data collection top
Bruker APEX II CCD
diffractometer		3182 independent reflections
Radiation source: fine-focus sealed tube2257 reflections with I > 2σ(I)
Monochromator: graphiteRint = 0.049
T = 293(2) Kθmax = 25.4º
φ and ω scansθmin = 3.0º
Absorption correction: multi-scan
(SADABS; Bruker, 2001)		h = −25→25
Tmin = 0.202, Tmax = 0.380k = −16→16
11548 measured reflectionsl = 0→14
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.059H-atom parameters constrained
wR(F2) = 0.147  w = 1/[σ2(Fo2) + (0.077P)2]
where P = (Fo2 + 2Fc2)/3
S = 1.00(Δ/σ)max = 0.018
3182 reflectionsΔρmax = 1.05 e Å−3
213 parametersΔρmin = −0.70 e Å−3
Primary atom site location: structure-invariant direct methodsExtinction correction: none
Crystal data top
[Fe2(C16H12Br2N2O2)2O]V = 3486.3 (7) Å3
Mr = 975.89Z = 4
Orthorhombic, PccaMo Kα
a = 21.094 (2) ŵ = 5.46 mm−1
b = 13.8168 (18) ÅT = 293 (2) K
c = 11.9619 (12) Å0.43 × 0.28 × 0.22 mm
Data collection top
Bruker APEX II CCD
diffractometer		3182 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 2001)		2257 reflections with I > 2σ(I)
Tmin = 0.202, Tmax = 0.380Rint = 0.049
11548 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.059213 parameters
wR(F2) = 0.147H-atom parameters constrained
S = 1.00Δρmax = 1.05 e Å−3
3182 reflectionsΔρmin = −0.70 e Å−3
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
xyzUiso*/Ueq
Fe10.07194 (4)0.12987 (5)0.31467 (6)0.0342 (2)
Br10.10796 (4)0.66034 (5)0.24478 (7)0.0776 (3)
Br20.28253 (3)−0.28115 (5)0.48690 (6)0.0663 (3)
C10.0405 (3)0.3280 (4)0.4134 (4)0.0404 (13)
H10.02300.36700.46870.048*
C20.0734 (3)0.3750 (4)0.3197 (5)0.0392 (12)
C30.1029 (3)0.3259 (4)0.2294 (5)0.0405 (13)
C40.1303 (3)0.3799 (4)0.1413 (5)0.0514 (15)
H40.14770.34770.08030.062*
C50.1316 (3)0.4776 (4)0.1447 (6)0.0574 (17)
H50.15040.51260.08720.069*
C60.1039 (3)0.5260 (4)0.2367 (5)0.0519 (16)
C70.0744 (3)0.4748 (4)0.3235 (5)0.0476 (14)
H70.05570.50770.38290.057*
C80.0009 (3)0.1958 (4)0.5204 (5)0.0432 (14)
H8A−0.03820.16500.49700.052*
H8B−0.00910.24620.57410.052*
C90.0461 (3)0.1213 (4)0.5721 (4)0.0423 (13)
H9A0.07650.15340.62020.051*
H9B0.02240.07510.61660.051*
C100.1146 (3)−0.0002 (4)0.5091 (4)0.0385 (13)
H100.1140−0.01810.58400.046*
C110.1561 (3)−0.0556 (4)0.4331 (4)0.0370 (12)
C120.1643 (3)−0.0340 (3)0.3168 (4)0.0356 (11)
C130.2041 (3)−0.0949 (4)0.2516 (5)0.0410 (13)
H130.2075−0.08490.17490.049*
C140.2370 (3)−0.1675 (4)0.3005 (5)0.0474 (14)
H140.2640−0.20580.25760.057*
C150.2308 (3)−0.1858 (4)0.4169 (5)0.0463 (14)
C160.1901 (3)−0.1313 (4)0.4831 (5)0.0428 (14)
H160.1856−0.14480.55890.051*
N10.0797 (2)0.0703 (3)0.4793 (4)0.0363 (10)
N20.0348 (2)0.2370 (3)0.4227 (4)0.0360 (10)
O10.10571 (18)0.2321 (3)0.2223 (3)0.0435 (9)
O20.13721 (19)0.0409 (3)0.2686 (3)0.0414 (9)
O30.00000.0842 (4)0.25000.0388 (12)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Fe10.0433 (5)0.0267 (4)0.0327 (4)0.0006 (3)0.0003 (3)−0.0002 (3)
Br10.1084 (7)0.0293 (4)0.0950 (6)−0.0024 (3)0.0277 (5)0.0093 (4)
Br20.0660 (5)0.0586 (5)0.0744 (5)0.0225 (3)0.0087 (4)0.0251 (4)
C10.044 (3)0.036 (3)0.041 (3)0.001 (2)0.001 (3)−0.007 (2)
C20.042 (3)0.031 (3)0.045 (3)0.000 (2)−0.001 (3)0.002 (2)
C30.042 (3)0.037 (3)0.043 (3)−0.003 (2)0.003 (3)0.001 (3)
C40.062 (4)0.042 (3)0.050 (3)0.001 (3)0.007 (3)0.011 (3)
C50.067 (4)0.040 (3)0.066 (4)−0.007 (3)0.013 (3)0.009 (3)
C60.064 (4)0.029 (3)0.064 (4)−0.004 (3)0.005 (3)0.012 (3)
C70.051 (4)0.032 (3)0.060 (4)0.001 (3)0.004 (3)0.002 (3)
C80.050 (4)0.038 (3)0.042 (3)0.001 (3)0.011 (3)0.004 (3)
C90.052 (3)0.041 (3)0.034 (3)−0.001 (3)0.010 (3)0.001 (2)
C100.051 (4)0.030 (3)0.035 (3)−0.006 (2)−0.001 (3)0.001 (2)
C110.041 (3)0.030 (3)0.041 (3)−0.001 (2)−0.003 (2)0.003 (2)
C120.043 (3)0.027 (2)0.037 (3)−0.001 (2)0.001 (2)−0.001 (2)
C130.049 (3)0.034 (3)0.041 (3)0.003 (2)0.001 (3)0.001 (2)
C140.048 (3)0.038 (3)0.057 (4)0.005 (3)0.008 (3)0.002 (3)
C150.044 (3)0.043 (3)0.052 (3)0.003 (3)0.005 (3)0.016 (3)
C160.047 (3)0.038 (3)0.043 (3)−0.001 (3)0.002 (3)0.010 (3)
N10.045 (3)0.029 (2)0.035 (2)0.0013 (19)0.002 (2)−0.0019 (19)
N20.042 (3)0.025 (2)0.041 (2)−0.0042 (18)0.005 (2)0.0019 (19)
O10.055 (3)0.030 (2)0.045 (2)−0.0026 (17)0.0101 (19)0.0019 (17)
O20.056 (2)0.034 (2)0.0346 (18)0.0113 (17)−0.0020 (18)0.0024 (16)
O30.045 (3)0.028 (3)0.043 (3)0.000−0.009 (2)0.000
Geometric parameters (Å, °) top
Fe1—O31.8162 (18)C8—C91.533 (8)
Fe1—O21.926 (4)C8—H8A0.9700
Fe1—O11.930 (4)C8—H8B0.9700
Fe1—N22.116 (4)C9—N11.493 (7)
Fe1—N12.141 (4)C9—H9A0.9700
Br1—C61.861 (6)C9—H9B0.9700
Br2—C151.905 (6)C10—N11.272 (7)
C1—N21.268 (6)C10—C111.474 (7)
C1—C21.470 (7)C10—H100.9300
C1—H10.9300C11—C161.404 (7)
C2—C71.380 (7)C11—C121.434 (7)
C2—C31.419 (8)C12—O21.314 (6)
C3—O11.299 (6)C12—C131.422 (7)
C3—C41.414 (8)C13—C141.354 (8)
C4—C51.351 (8)C13—H130.9300
C4—H40.9300C14—C151.421 (8)
C5—C61.414 (9)C14—H140.9300
C5—H50.9300C15—C161.388 (8)
C6—C71.402 (8)C16—H160.9300
C7—H70.9300O3—Fe1i1.8162 (18)
C8—N21.483 (7)
O3—Fe1—O2104.71 (16)N1—C9—C8108.2 (4)
O3—Fe1—O1108.58 (16)N1—C9—H9A110.1
O2—Fe1—O192.29 (16)C8—C9—H9A110.1
O3—Fe1—N2101.14 (16)N1—C9—H9B110.1
O2—Fe1—N2152.39 (17)C8—C9—H9B110.1
O1—Fe1—N288.51 (16)H9A—C9—H9B108.4
O3—Fe1—N1108.78 (15)N1—C10—C11124.6 (5)
O2—Fe1—N187.89 (16)N1—C10—H10117.7
O1—Fe1—N1141.27 (17)C11—C10—H10117.7
N2—Fe1—N174.66 (16)C16—C11—C12120.4 (5)
N2—C1—C2123.4 (5)C16—C11—C10115.4 (5)
N2—C1—H1118.3C12—C11—C10124.2 (5)
C2—C1—H1118.3O2—C12—C13118.8 (4)
C7—C2—C3119.8 (5)O2—C12—C11122.4 (5)
C7—C2—C1115.0 (5)C13—C12—C11118.7 (5)
C3—C2—C1125.1 (5)C14—C13—C12120.3 (5)
O1—C3—C2123.1 (5)C14—C13—H13119.8
O1—C3—C4117.3 (5)C12—C13—H13119.8
C2—C3—C4119.6 (5)C13—C14—C15120.5 (5)
C5—C4—C3120.9 (6)C13—C14—H14119.8
C5—C4—H4119.6C15—C14—H14119.8
C3—C4—H4119.6C16—C15—C14121.3 (5)
C4—C5—C6119.2 (6)C16—C15—Br2118.6 (4)
C4—C5—H5120.4C14—C15—Br2120.0 (4)
C6—C5—H5120.4C15—C16—C11118.5 (5)
C7—C6—C5121.4 (5)C15—C16—H16120.7
C7—C6—Br1119.0 (5)C11—C16—H16120.7
C5—C6—Br1119.5 (4)C10—N1—C9115.4 (4)
C2—C7—C6119.1 (6)C10—N1—Fe1126.6 (4)
C2—C7—H7120.5C9—N1—Fe1117.8 (3)
C6—C7—H7120.5C1—N2—C8119.7 (5)
N2—C8—C9106.0 (4)C1—N2—Fe1127.2 (4)
N2—C8—H8A110.5C8—N2—Fe1113.0 (3)
C9—C8—H8A110.5C3—O1—Fe1132.5 (3)
N2—C8—H8B110.5C12—O2—Fe1133.4 (3)
C9—C8—H8B110.5Fe1i—O3—Fe1139.4 (3)
H8A—C8—H8B108.7
Symmetry codes: (i) −x, y, −z+1/2.
Table 1
Selected geometric parameters (Å, °) top
Fe1—O31.8162 (18)Fe1—N22.116 (4)
Fe1—O21.926 (4)Fe1—N12.141 (4)
Fe1—O11.930 (4)
Fe1i—O3—Fe1139.4 (3)
Symmetry codes: (i) −x, y, −z+1/2.
Acknowledgements top

The authors thank Liaocheng University for financial support and Professor Jianmin Dou for his help.

references
References top

Bruker (2001). SAINT-Plus and SHELXTL. Bruker AXS Inc., Madison, Wisconsin, USA.

Bruker (2004). APEX2. Bruker AXS Inc., Madison, Wisconsin, USA.

Chen, P., Fan, B. B., Song, M. G., Jin, C., Ma, J. H. & Li, R. F. (2006). Catal. Commun. 7, 969–973.

Karacan, M. S. & Somer, G. J. (2004). Photochem. Photobiol. A Chem. 163, 307–310.

Sheldrick, G. M. (1997). SHELXL97 and SHELXS97. University of Göttingen, Germany.