metal-organic compounds
Retracted: Diaqua-1κO,3κO-di-μ-cyanido-1:2κ2N:C;2:3κ2C:N-dicyanido-2κ2C-bis{4,4′-dibromo-2,2′-[propane-1,2-diylbis(nitrilomethylidyne)]diphenolato}-1κ4O,N,N′,O′;3κ4O,N,N′,O′-1,3-diiron(III)-2-nickel(II)
aDepartment of Chemistry and Chemical Engineering, ShanDong Institute of Education, Jinan 250013, People's Republic of China
*Correspondence e-mail: weipeihai@yahoo.com.cn
The title compound, [Fe2Ni(C17H14Br2N2O2)2(CN)4(H2O)2] or [{Fe(C17H14Br2N2O2)(H2O)}2(μ-CN)2{Ni(CN)2}], is isostructural with its MnIII-containing analogue. Each FeIII atom is chelated by a Schiff base ligand via two N and two O atoms and is additionally coordinated by a water molecule, forming a slightly distorted octahedral geometry. The two FeIII centres are bridged by a square-planar Ni(CN)4 unit, which lies on an inversion centre. A two-dimensional network is formed via O—H⋯O and O—H⋯N hydrogen bonds.
Related literature
For related literature, see: Kuang et al. (2002); Kuchar et al. (2003); Yang et al. (2003). For the isostructural MnIII-containing compound, see: Sun et al. (2008).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2004); cell SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; 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
10.1107/S1600536808017893/cf2205sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536808017893/cf2205Isup2.hkl
A mixture of iron(III) acetylacetonate (1 mmol), N,N'-bis(2-hydroxy-5-bromobenzyl)-1,2-diaminopropane (1 mmol), and dipotassium tetracyanidonickelate(II) (1 mmol) in 20 ml methanol was refluxed for several hours. The cooled solution was filtered and the filtrate was kept in an ice box. One week later, brown blocks of (I) were obtained with a yield of 5%. Anal. Calc. for C38H32Br4Fe2N8NiO6: C 38.43, H 2.70, N 9.44%; Found: C 38.40, H 2.63, N 9.39.
All C-bound H atoms were placed in calculated positions with C—H = 0.93 Å and refined as riding with Uiso(H) = 1.2Ueq(C). H atoms on the aqua ligand were located in a difference density map and were refined with the distance restraint O—H = 0.82 (1) Å.
Data collection: APEX2 (Bruker, 2004); cell
SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus (Bruker, 2001); 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).[Fe2Ni(C17H14Br2N2O2)2(CN)4(H2O)2] | F(000) = 1168 |
Mr = 1186.71 | Dx = 1.840 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 3699 reflections |
a = 11.599 (2) Å | θ = 3.0–25.1° |
b = 13.538 (3) Å | µ = 4.89 mm−1 |
c = 14.715 (3) Å | T = 293 K |
β = 112.04 (3)° | Block, brown |
V = 2141.8 (7) Å3 | 0.10 × 0.10 × 0.10 mm |
Z = 2 |
Bruker APEXII CCD diffractometer | 3699 independent reflections |
Radiation source: fine-focus sealed tube | 2263 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.085 |
ϕ and ω scans | θmax = 25.1°, θmin = 3.0° |
Absorption correction: multi-scan (SADABS; Bruker, 2001) | h = −13→12 |
Tmin = 0.449, Tmax = 0.641 | k = −16→15 |
13404 measured reflections | l = −17→17 |
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)] = 0.066 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.181 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | w = 1/[σ2(Fo2) + (0.09P)2] where P = (Fo2 + 2Fc2)/3 |
3699 reflections | (Δ/σ)max < 0.001 |
276 parameters | Δρmax = 0.96 e Å−3 |
3 restraints | Δρmin = −0.64 e Å−3 |
[Fe2Ni(C17H14Br2N2O2)2(CN)4(H2O)2] | V = 2141.8 (7) Å3 |
Mr = 1186.71 | Z = 2 |
Monoclinic, P21/n | Mo Kα radiation |
a = 11.599 (2) Å | µ = 4.89 mm−1 |
b = 13.538 (3) Å | T = 293 K |
c = 14.715 (3) Å | 0.10 × 0.10 × 0.10 mm |
β = 112.04 (3)° |
Bruker APEXII CCD diffractometer | 3699 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2001) | 2263 reflections with I > 2σ(I) |
Tmin = 0.449, Tmax = 0.641 | Rint = 0.085 |
13404 measured reflections |
R[F2 > 2σ(F2)] = 0.066 | 3 restraints |
wR(F2) = 0.181 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | Δρmax = 0.96 e Å−3 |
3699 reflections | Δρmin = −0.64 e Å−3 |
276 parameters |
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. |
x | y | z | Uiso*/Ueq | ||
Fe1 | 0.29547 (11) | 0.95323 (8) | 0.36728 (8) | 0.0341 (4) | |
Ni1 | 0.0000 | 1.0000 | 0.0000 | 0.0334 (4) | |
Br1 | −0.07330 (10) | 1.37221 (7) | 0.43825 (7) | 0.0569 (4) | |
Br2 | 0.75936 (10) | 0.61244 (8) | 0.30711 (8) | 0.0621 (4) | |
C1 | 0.1210 (8) | 0.9936 (5) | 0.1261 (6) | 0.035 (2) | |
C2 | −0.0637 (8) | 0.8804 (6) | 0.0276 (6) | 0.037 (2) | |
C3 | 0.2234 (8) | 1.1459 (6) | 0.4134 (6) | 0.034 (2) | |
C4 | 0.2476 (8) | 1.2492 (5) | 0.4247 (5) | 0.033 (2) | |
H4 | 0.3242 | 1.2728 | 0.4277 | 0.039* | |
C5 | 0.1608 (9) | 1.3146 (6) | 0.4311 (6) | 0.042 (2) | |
H5 | 0.1780 | 1.3819 | 0.4362 | 0.050* | |
C6 | 0.0471 (9) | 1.2807 (6) | 0.4303 (6) | 0.042 (2) | |
C7 | 0.0185 (9) | 1.1818 (6) | 0.4197 (6) | 0.045 (2) | |
H7 | −0.0581 | 1.1603 | 0.4187 | 0.054* | |
C8 | 0.1029 (8) | 1.1136 (5) | 0.4104 (6) | 0.037 (2) | |
C9 | 0.0680 (8) | 1.0105 (6) | 0.3966 (6) | 0.035 (2) | |
H9 | −0.0079 | 0.9939 | 0.4004 | 0.042* | |
C10 | 0.0874 (10) | 0.8350 (7) | 0.3700 (9) | 0.067 (3) | |
H10A | 0.1154 | 0.8044 | 0.4343 | 0.080* | |
H10B | −0.0028 | 0.8331 | 0.3424 | 0.080* | |
C11 | 0.1355 (9) | 0.7815 (7) | 0.3082 (9) | 0.067 (3) | |
H11 | 0.0893 | 0.8088 | 0.2429 | 0.080* | |
C12 | 0.1048 (10) | 0.6739 (6) | 0.2961 (8) | 0.060 (3) | |
H12A | 0.1567 | 0.6390 | 0.3537 | 0.091* | |
H12B | 0.1188 | 0.6491 | 0.2400 | 0.091* | |
H12C | 0.0191 | 0.6646 | 0.2869 | 0.091* | |
C13 | 0.3443 (8) | 0.7546 (5) | 0.3198 (5) | 0.032 (2) | |
H13 | 0.3196 | 0.6893 | 0.3047 | 0.039* | |
C14 | 0.4688 (8) | 0.7786 (6) | 0.3302 (5) | 0.033 (2) | |
C15 | 0.5437 (9) | 0.7030 (6) | 0.3193 (5) | 0.038 (2) | |
H15 | 0.5141 | 0.6384 | 0.3116 | 0.046* | |
C16 | 0.6591 (9) | 0.7209 (7) | 0.3197 (6) | 0.049 (3) | |
C17 | 0.7053 (9) | 0.8158 (7) | 0.3289 (6) | 0.048 (2) | |
H17 | 0.7829 | 0.8280 | 0.3262 | 0.058* | |
C18 | 0.6337 (8) | 0.8932 (6) | 0.3422 (6) | 0.039 (2) | |
H18 | 0.6657 | 0.9570 | 0.3509 | 0.047* | |
C19 | 0.5155 (8) | 0.8770 (6) | 0.3428 (5) | 0.033 (2) | |
N1 | 0.1906 (7) | 0.9903 (4) | 0.2063 (5) | 0.0368 (18) | |
N2 | −0.0938 (7) | 0.8039 (5) | 0.0441 (5) | 0.046 (2) | |
N3 | 0.1306 (6) | 0.9396 (5) | 0.3796 (5) | 0.0400 (18) | |
N4 | 0.2649 (6) | 0.8131 (4) | 0.3289 (4) | 0.0294 (16) | |
O1 | 0.4524 (5) | 0.9530 (3) | 0.3561 (4) | 0.0309 (13) | |
O2 | 0.3095 (5) | 1.0870 (4) | 0.4047 (4) | 0.0308 (13) | |
O3 | 0.3783 (5) | 0.9024 (4) | 0.5250 (4) | 0.0352 (14) | |
H1W | 0.433 (5) | 0.942 (3) | 0.547 (6) | 0.042* | |
H2W | 0.397 (6) | 0.8444 (16) | 0.530 (6) | 0.042* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Fe1 | 0.0365 (8) | 0.0271 (7) | 0.0247 (6) | 0.0005 (5) | −0.0045 (5) | −0.0009 (5) |
Ni1 | 0.0368 (9) | 0.0254 (8) | 0.0201 (7) | −0.0002 (6) | −0.0101 (6) | 0.0006 (6) |
Br1 | 0.0723 (8) | 0.0473 (6) | 0.0454 (6) | 0.0242 (5) | 0.0155 (5) | −0.0023 (5) |
Br2 | 0.0537 (7) | 0.0690 (8) | 0.0549 (7) | 0.0211 (5) | 0.0105 (5) | −0.0137 (5) |
C1 | 0.054 (6) | 0.012 (4) | 0.029 (5) | −0.002 (4) | 0.003 (4) | 0.000 (3) |
C2 | 0.036 (5) | 0.032 (5) | 0.024 (4) | 0.002 (4) | −0.010 (4) | 0.000 (4) |
C3 | 0.037 (5) | 0.029 (4) | 0.022 (4) | 0.004 (4) | −0.007 (4) | −0.003 (3) |
C4 | 0.039 (5) | 0.031 (4) | 0.018 (4) | −0.008 (4) | −0.001 (4) | 0.001 (3) |
C5 | 0.060 (7) | 0.028 (5) | 0.031 (5) | 0.011 (5) | 0.010 (5) | −0.004 (4) |
C6 | 0.056 (6) | 0.026 (5) | 0.032 (5) | 0.006 (4) | 0.005 (4) | 0.001 (4) |
C7 | 0.052 (6) | 0.054 (6) | 0.022 (4) | 0.011 (5) | 0.005 (4) | −0.006 (4) |
C8 | 0.044 (6) | 0.030 (5) | 0.024 (4) | 0.009 (4) | −0.002 (4) | 0.001 (3) |
C9 | 0.031 (5) | 0.038 (5) | 0.030 (4) | 0.001 (4) | 0.004 (4) | −0.004 (4) |
C10 | 0.064 (7) | 0.043 (6) | 0.104 (9) | −0.016 (5) | 0.045 (7) | −0.025 (6) |
C11 | 0.047 (7) | 0.040 (6) | 0.112 (10) | −0.004 (5) | 0.030 (7) | −0.028 (6) |
C12 | 0.059 (7) | 0.039 (5) | 0.076 (8) | −0.008 (5) | 0.017 (6) | −0.008 (5) |
C13 | 0.040 (5) | 0.019 (4) | 0.027 (4) | 0.000 (4) | −0.001 (4) | −0.001 (3) |
C14 | 0.034 (5) | 0.034 (5) | 0.020 (4) | 0.009 (4) | −0.003 (4) | −0.008 (3) |
C15 | 0.047 (6) | 0.038 (5) | 0.019 (4) | 0.001 (4) | −0.001 (4) | 0.000 (3) |
C16 | 0.053 (6) | 0.052 (6) | 0.025 (5) | 0.020 (5) | −0.004 (4) | −0.009 (4) |
C17 | 0.043 (6) | 0.054 (6) | 0.043 (6) | −0.001 (5) | 0.013 (5) | −0.011 (5) |
C18 | 0.042 (6) | 0.045 (5) | 0.025 (4) | −0.003 (4) | 0.006 (4) | −0.004 (4) |
C19 | 0.035 (5) | 0.043 (5) | 0.010 (4) | 0.010 (4) | −0.005 (3) | −0.003 (3) |
N1 | 0.042 (4) | 0.026 (4) | 0.024 (4) | −0.007 (3) | −0.009 (3) | 0.000 (3) |
N2 | 0.055 (5) | 0.029 (4) | 0.037 (4) | −0.008 (4) | −0.001 (4) | −0.005 (3) |
N3 | 0.038 (4) | 0.033 (4) | 0.043 (4) | −0.003 (3) | 0.007 (4) | −0.011 (3) |
N4 | 0.028 (4) | 0.026 (4) | 0.026 (4) | 0.000 (3) | 0.000 (3) | −0.001 (3) |
O1 | 0.031 (3) | 0.028 (3) | 0.023 (3) | 0.002 (2) | −0.001 (2) | 0.001 (2) |
O2 | 0.031 (3) | 0.028 (3) | 0.025 (3) | 0.001 (2) | 0.001 (2) | 0.001 (2) |
O3 | 0.040 (4) | 0.025 (3) | 0.025 (3) | −0.004 (3) | −0.004 (3) | −0.003 (3) |
Fe1—O2 | 1.882 (5) | C9—H9 | 0.930 |
Fe1—O1 | 1.888 (6) | C10—C11 | 1.430 (13) |
Fe1—N4 | 1.973 (6) | C10—N3 | 1.490 (11) |
Fe1—N3 | 1.996 (7) | C10—H10A | 0.970 |
Fe1—O3 | 2.261 (5) | C10—H10B | 0.970 |
Fe1—N1 | 2.276 (6) | C11—N4 | 1.478 (11) |
Ni1—C1i | 1.862 (8) | C11—C12 | 1.494 (11) |
Ni1—C1 | 1.862 (8) | C11—H11 | 0.980 |
Ni1—C2 | 1.886 (9) | C12—H12A | 0.960 |
Ni1—C2i | 1.886 (9) | C12—H12B | 0.960 |
Br1—C6 | 1.903 (9) | C12—H12C | 0.960 |
Br2—C16 | 1.924 (9) | C13—N4 | 1.260 (9) |
C1—N1 | 1.154 (10) | C13—C14 | 1.431 (11) |
C2—N2 | 1.148 (9) | C13—H13 | 0.930 |
C3—O2 | 1.322 (9) | C14—C15 | 1.390 (11) |
C3—C4 | 1.423 (10) | C14—C19 | 1.424 (11) |
C3—C8 | 1.449 (12) | C15—C16 | 1.359 (13) |
C4—C5 | 1.371 (11) | C15—H15 | 0.930 |
C4—H4 | 0.930 | C16—C17 | 1.378 (12) |
C5—C6 | 1.393 (13) | C17—C18 | 1.396 (12) |
C5—H5 | 0.930 | C17—H17 | 0.930 |
C6—C7 | 1.374 (11) | C18—C19 | 1.392 (12) |
C7—C8 | 1.389 (12) | C18—H18 | 0.930 |
C7—H7 | 0.930 | C19—O1 | 1.318 (9) |
C8—C9 | 1.445 (10) | O3—H1W | 0.80 (6) |
C9—N3 | 1.284 (10) | O3—H2W | 0.81 (2) |
O2—Fe1—O1 | 92.7 (2) | N3—C10—H10B | 109.6 |
O2—Fe1—N4 | 174.5 (3) | H10A—C10—H10B | 108.2 |
O1—Fe1—N4 | 92.8 (3) | C10—C11—N4 | 109.3 (8) |
O2—Fe1—N3 | 92.5 (2) | C10—C11—C12 | 115.9 (10) |
O1—Fe1—N3 | 174.6 (2) | N4—C11—C12 | 119.0 (8) |
N4—Fe1—N3 | 82.0 (3) | C10—C11—H11 | 103.5 |
O2—Fe1—O3 | 92.1 (2) | N4—C11—H11 | 103.5 |
O1—Fe1—O3 | 92.1 (2) | C12—C11—H11 | 103.5 |
N4—Fe1—O3 | 87.8 (2) | C11—C12—H12A | 109.5 |
N3—Fe1—O3 | 86.1 (3) | C11—C12—H12B | 109.5 |
O2—Fe1—N1 | 92.7 (2) | H12A—C12—H12B | 109.5 |
O1—Fe1—N1 | 93.8 (2) | C11—C12—H12C | 109.5 |
N4—Fe1—N1 | 86.9 (2) | H12A—C12—H12C | 109.5 |
N3—Fe1—N1 | 87.6 (3) | H12B—C12—H12C | 109.5 |
O3—Fe1—N1 | 172.3 (2) | N4—C13—C14 | 126.5 (7) |
C1i—Ni1—C1 | 180.0 (4) | N4—C13—H13 | 116.8 |
C1i—Ni1—C2 | 92.6 (3) | C14—C13—H13 | 116.8 |
C1—Ni1—C2 | 87.4 (3) | C15—C14—C19 | 118.8 (8) |
C1i—Ni1—C2i | 87.4 (3) | C15—C14—C13 | 118.0 (7) |
C1—Ni1—C2i | 92.6 (3) | C19—C14—C13 | 123.0 (7) |
C2—Ni1—C2i | 180.000 (1) | C16—C15—C14 | 121.7 (8) |
N1—C1—Ni1 | 176.0 (9) | C16—C15—H15 | 119.2 |
N2—C2—Ni1 | 174.3 (8) | C14—C15—H15 | 119.2 |
O2—C3—C4 | 118.7 (8) | C15—C16—C17 | 120.9 (9) |
O2—C3—C8 | 124.7 (7) | C15—C16—Br2 | 119.5 (7) |
C4—C3—C8 | 116.5 (7) | C17—C16—Br2 | 119.6 (8) |
C5—C4—C3 | 121.7 (8) | C16—C17—C18 | 118.9 (9) |
C5—C4—H4 | 119.2 | C16—C17—H17 | 120.5 |
C3—C4—H4 | 119.2 | C18—C17—H17 | 120.5 |
C4—C5—C6 | 120.3 (8) | C19—C18—C17 | 121.5 (8) |
C4—C5—H5 | 119.9 | C19—C18—H18 | 119.2 |
C6—C5—H5 | 119.9 | C17—C18—H18 | 119.2 |
C7—C6—C5 | 120.6 (8) | O1—C19—C18 | 118.8 (8) |
C7—C6—Br1 | 119.4 (7) | O1—C19—C14 | 123.0 (8) |
C5—C6—Br1 | 119.9 (6) | C18—C19—C14 | 118.2 (8) |
C6—C7—C8 | 120.7 (9) | C1—N1—Fe1 | 165.6 (7) |
C6—C7—H7 | 119.7 | C9—N3—C10 | 122.3 (8) |
C8—C7—H7 | 119.7 | C9—N3—Fe1 | 125.4 (6) |
C7—C8—C9 | 119.0 (9) | C10—N3—Fe1 | 112.3 (6) |
C7—C8—C3 | 120.2 (8) | C13—N4—C11 | 121.5 (7) |
C9—C8—C3 | 120.8 (7) | C13—N4—Fe1 | 125.1 (6) |
N3—C9—C8 | 126.9 (8) | C11—N4—Fe1 | 113.4 (5) |
N3—C9—H9 | 116.6 | C19—O1—Fe1 | 128.4 (5) |
C8—C9—H9 | 116.6 | C3—O2—Fe1 | 128.5 (5) |
C11—C10—N3 | 110.1 (8) | Fe1—O3—H1W | 100 (6) |
C11—C10—H10A | 109.6 | Fe1—O3—H2W | 112 (6) |
N3—C10—H10A | 109.6 | H1W—O3—H2W | 118 (4) |
C11—C10—H10B | 109.6 |
Symmetry code: (i) −x, −y+2, −z. |
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H1W···O1ii | 0.81 (2) | 2.09 (4) | 2.859 (7) | 159 (8) |
O3—H2W···N2iii | 0.81 (2) | 2.02 (2) | 2.813 (9) | 167 (7) |
Symmetry codes: (ii) −x+1, −y+2, −z+1; (iii) x+1/2, −y+3/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | [Fe2Ni(C17H14Br2N2O2)2(CN)4(H2O)2] |
Mr | 1186.71 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 293 |
a, b, c (Å) | 11.599 (2), 13.538 (3), 14.715 (3) |
β (°) | 112.04 (3) |
V (Å3) | 2141.8 (7) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 4.89 |
Crystal size (mm) | 0.10 × 0.10 × 0.10 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2001) |
Tmin, Tmax | 0.449, 0.641 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 13404, 3699, 2263 |
Rint | 0.085 |
(sin θ/λ)max (Å−1) | 0.596 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.066, 0.181, 1.00 |
No. of reflections | 3699 |
No. of parameters | 276 |
No. of restraints | 3 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.96, −0.64 |
Computer programs: APEX2 (Bruker, 2004), SAINT-Plus (Bruker, 2001), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H1W···O1i | 0.81 (2) | 2.09 (4) | 2.859 (7) | 159 (8) |
O3—H2W···N2ii | 0.81 (2) | 2.02 (2) | 2.813 (9) | 167 (7) |
Symmetry codes: (i) −x+1, −y+2, −z+1; (ii) x+1/2, −y+3/2, z+1/2. |
Acknowledgements
The authors thank the National Ministry of Science and Technology of China (grant No. 2001CB6105–07).
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Cyanide-bridged oligonuclear complexes with chain-like arrangements of metal ions and cyanide ligands have been studied for a long time due to the good electronic conductivity between the metallic groups (Kuang et al., 2002; Kuchar et al., 2003; Yang et al., 2003). In this context, bulk properties such as magnetism, luminescence, electrical conductivity resulting from metal-metal charge transfer like multi-redox steps, mixed valence and long-range electronic interactions prompted us to report our research work on cyanide-bridged complexes. In this paper, we report the structure of the title compound, (I). It is isostructural with its MnIII-containing analogue (Sun et al., 2008).
As shown in Fig. 1, each FeIII atom is chelated by a Schiff base ligand via two N and two O atoms and is additionally coordinated by a water molecule, forming a slightly distorted octahedral geometry. The Schiff base lies in the equatorial plane, and the cyanido and aqua ligands lie in the axial coordination sites. The Fe—N and Fe—O axial bond lengths are much longer than the equatorial ones. A centrosymmetric square-planar Ni(CN)4 unit links two FeIII centres. With O—H···O and O—H···N hydrogen bonds, a two-dimensional network is formed, as shown in Fig. 2.