metal-organic compounds
μ-Oxido-bis({2,2′-[o-phenylenebis(nitrilomethylidyne)]diphenolato}iron(III)) methanol monosolvate dihydrate
aSchool of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China, and bSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, People's Republic of China
*Correspondence e-mail: xiaopingshen@163.com
The title complex, [Fe2(C20H14N2O2)2O]·CH4O·2H2O, is composed of μ-oxido-bridged ferric 2,2′-[o-phenylenebis(nitrilomethylidyne)]diphenolate (salphen) dimers, one methanol molecule and two H2O molecules. Each iron(III) ion, surrounded by two coordinating N and O atoms from the salphen ligand and one bridging O atom, shows a five-coordinate square-pyramidal geometry. One of the two solvent water molecules is disordered over three positions with occupancies of 0.44 (1), 0.37 (1) and 0.19 (1).
Related literature
For background to μ-oxo-diiron(III) complexes, see: Kurtz et al. (1990); Vincent et al. (1990); Reedijk & Bouwman (1999); Oyaizu et al. (2001). For related structures, see: Ashmawy & Ujaimi (1991); Elmali et al. (1993); Oyaizu et al. (2001).
Experimental
Crystal data
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Refinement
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Data collection: CrystalClear (Rigaku, 2008); cell CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2006); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).
Supporting information
https://doi.org/10.1107/S1600536810031533/zl2295sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810031533/zl2295Isup2.hkl
Red prismatic crystals of the title complex were obtained by slow evaporation of a MeOH and H2O (V/V = 1:1, 10 mL) mixture of {Fe(salphen)(C2H5OH)2}Cl (0.1 mmol) in the dark at room temperature. The resulting crystals were collected, washed with H2O and MeOH, respectively, and dried in air. Melting point = 446.6 K. IR (KBr, cm-1): 3416(s), 2958(m), 2921(m), 2115(w), 1605(s), 1581(s), 1532(s), 1462(s), 1446(m), 1381(m), 1323(m), 1193(m), 1158(m), 1050(m), 745(m), 540(m).
All non-H atoms were refined anisotropically. The (C)H atoms of the salphenH2 ligand were placed in calculated positions (C - H = 0.93 Å) and refined using a riding model, with Uiso(H) = 1.2Ueq(C). The (C)H atoms of the methanol molecule were placed geometrically (C - H = 0.96 Å) and refined as riding, with Uiso(H) = 1.5Ueq(C). The (O)H atoms of the methanol molecule was placed geometrically (O - H = 0.82 Å) with Uiso(H) = 1.5Ueq(O). The (O)H atoms of water molecule (O7) were located in a difference Fourier map and refined as riding with Uiso(H) = 1.2Ueq(O). The other water molecule in the structure was found to be svererly disordered and has been refined as disordered over three positions with occupancies of 43.9 (4)%, 37 (1)% and 19 (1)% for O8, O9 and O10, respectively, summing up to 100%. Hydrogen atoms for the disordered water molecule could not be loctated and were omitted from the refinement.
µ-Oxo-diiron(III) complexes are of considerable interest to chemists and biologists because of their interesting electronic structures and the magnetic interactions between the two iron(III) centers, and the role played by the oxo-bridged dinuclear iron centres in proteins (Kurtz et al., 1990; Vincent et al., 1990; Oyaizu et al., 2001). The Fe—Fe distances and the corresponding the Fe—O—Fe bond lengths and the angles are the most important factors that determine the electronic and magnetic properties of these complexes (Reedijk et al., 1999). It is important to note that the
of µ-oxo-bridged ferric salphen dimers [salphenH2= N,N'-o-phenylenebis(salicylideneimine)] depend strongly on the presence and type of lattice solvent molecules: [{FeIII(salphen)}2O].CH2Cl2.C4H10O (Oyaizu et al., 2001); [{FeIII(salphen)}2O].DMSO (Ashmawy et al., 1991) and [{FeIII(salphen)}2O].C4H8O2 (Elmali et al., 1993). By using a different solvent system, we obtained a new methanol dihydrate solvate of the µ-oxo-diiron(III) complex, [{FeIII(salphen)}2O].CH3OH.2H2O. Herein, the of this solvate is presented.The title complex is composed of one µ-oxo-diiron(III) unit of [{FeIII(salphen)}2O], one methanol molecule and two H2O molecules (Fig. 1). Each iron(III) atom, surrounded by each two coordinating N and O atoms from the salphen ligand, extends outwards of the mean N2O2 plane towards the bridging oxygen atom by as much as 0.588 (3) and 0.583 (3) Å for Fe(1) and Fe(2), respectively. The iron atoms thus substantially protrude from the ligand planes and show a typical five-coordinate square-pyramidal geometry. The Fe—O (bridging) bond lengths are 1.786 (3) and 1.784 (3) Å for Fe(1) and Fe(2), respectively. The Fe—O—Fe angle of 146.68 (16)° is almost equal to the value of 146.7 (4)° reported for [{FeIII(salphen)}2O].DMSO (Ashmawy et al., 1991), and is bigger than the values of 141 (1)° and 145.0 (3)° reported for [{FeIII(salphen)}2O].CH2Cl2.C4H10O (Oyaizu et al., 2001) and [{FeIII(salphen)}2O].C4H8O2 (Elmali et al., 1993), respectively. The Fe···Fe distance of 3.420 (3) Å is consistent with the values (3.35–3.55 Å) reported for µ-oxo-diiron(III) complexes with macrocyclic ligands (Oyaizu et al., 2001). One of the two interstitial water molecules in the structure was found to be svererly disordered and has been refined as disordered over three positions with occupancies of 43.9 (4)%, 37 (1)% and 19 (1)% for O8, O9 and O10, respectively. Hydrogen atoms for the disordered water molecule could not be located and were omitted from the refinement.
There are some hydrogen-bonding interactions between methanol and water molecules, and between the water molecules and the salphen ligand. These hydrogen bonding interactions lead to a group of four oxygen atoms - two water and two methanol molecules - that are arranged around a crystallographic inversion center in a quadratic square pattern. The water molecules of the unit form additional bifurcated hydrogen bonds twoards the two oxygen atoms (O3, O4) of a salphen ligand of adjacent [{FeIII(salphen)}2O] complexes thus binding the complexes together by H-bonds via the square H2O/MeOH units (Table 1, Fig. 2). The oxygen atoms of the other salphen ligand of the complex (O1, O2) show signs of hydrogen bonding interactions with the disordered water molecule.
For background to µ-oxo-diiron(III) complexes, see: Kurtz et al. (1990); Vincent et al. (1990); Reedijk et al. (1999); Oyaizu et al. (2001). For related structures, see: Ashmawy & Ujaimi (1991); Elmali et al. (1993); Oyaizu et al. (2001).
Data collection: CrystalClear (Rigaku, 2008); cell
CrystalClear (Rigaku, 2008); data reduction: CrystalClear (Rigaku, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2006); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).[Fe2(C20H14N2O2)2O]·CH4O·2H2O | Z = 2 |
Mr = 824.44 | F(000) = 848 |
Triclinic, P1 | Dx = 1.427 Mg m−3 |
Hall symbol: -P 1 | Melting point: 446.6 K |
a = 13.042 (3) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 13.249 (3) Å | Cell parameters from 7899 reflections |
c = 13.724 (3) Å | θ = 2.7–28.9° |
α = 116.60 (3)° | µ = 0.82 mm−1 |
β = 110.50 (3)° | T = 298 K |
γ = 93.80 (3)° | Prism, red |
V = 1914.4 (12) Å3 | 0.22 × 0.20 × 0.20 mm |
Rigaku Model? CCD area-detector diffractometer | 6858 independent reflections |
Radiation source: fine-focus sealed tube | 4753 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.040 |
Detector resolution: 14.63 pixels mm-1 | θmax = 25.3°, θmin = 3.0° |
phi and ω scans | h = −13→15 |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | k = −15→15 |
Tmin = 0.841, Tmax = 0.854 | l = −13→16 |
15784 measured reflections |
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)] = 0.051 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.158 | H-atom parameters constrained |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0832P)2] where P = (Fo2 + 2Fc2)/3 |
6858 reflections | (Δ/σ)max < 0.001 |
519 parameters | Δρmax = 0.59 e Å−3 |
4 restraints | Δρmin = −0.34 e Å−3 |
[Fe2(C20H14N2O2)2O]·CH4O·2H2O | γ = 93.80 (3)° |
Mr = 824.44 | V = 1914.4 (12) Å3 |
Triclinic, P1 | Z = 2 |
a = 13.042 (3) Å | Mo Kα radiation |
b = 13.249 (3) Å | µ = 0.82 mm−1 |
c = 13.724 (3) Å | T = 298 K |
α = 116.60 (3)° | 0.22 × 0.20 × 0.20 mm |
β = 110.50 (3)° |
Rigaku Model? CCD area-detector diffractometer | 6858 independent reflections |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | 4753 reflections with I > 2σ(I) |
Tmin = 0.841, Tmax = 0.854 | Rint = 0.040 |
15784 measured reflections |
R[F2 > 2σ(F2)] = 0.051 | 4 restraints |
wR(F2) = 0.158 | H-atom parameters constrained |
S = 1.05 | Δρmax = 0.59 e Å−3 |
6858 reflections | Δρmin = −0.34 e Å−3 |
519 parameters |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 > 2sigma(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 | Occ. (<1) | |
Fe1 | 0.29364 (4) | 0.63148 (4) | 0.11270 (5) | 0.04383 (19) | |
Fe2 | 0.31765 (4) | 0.64507 (4) | 0.37482 (4) | 0.04180 (19) | |
O1 | 0.2687 (3) | 0.7573 (2) | 0.0824 (3) | 0.0654 (8) | |
O2 | 0.4527 (2) | 0.6843 (2) | 0.1582 (3) | 0.0634 (8) | |
O3 | 0.1917 (2) | 0.6451 (2) | 0.4169 (2) | 0.0561 (7) | |
O4 | 0.3020 (2) | 0.4836 (2) | 0.3307 (3) | 0.0613 (8) | |
O5 | 0.2735 (2) | 0.6584 (2) | 0.2435 (2) | 0.0512 (7) | |
O6 | 0.1044 (3) | 0.5981 (4) | 0.6541 (4) | 0.1005 (12) | |
H6 | 0.0414 | 0.6072 | 0.6256 | 0.151* | |
O7 | 0.1409 (4) | 0.4394 (4) | 0.4574 (3) | 0.1024 (12) | |
O8 | 0.4974 (9) | 0.0920 (8) | 0.9275 (10) | 0.103 (3) | 0.439 (4) |
O9 | 0.4522 (8) | 0.1400 (10) | 0.8664 (11) | 0.077 (5) | 0.367 (14) |
O10 | 0.5116 (18) | 0.0771 (17) | 0.8511 (15) | 0.068 (10) | 0.194 (14) |
N1 | 0.1355 (2) | 0.5283 (3) | −0.0380 (3) | 0.0431 (7) | |
N2 | 0.3115 (3) | 0.4595 (3) | 0.0466 (3) | 0.0433 (7) | |
N3 | 0.3882 (2) | 0.8219 (3) | 0.5153 (3) | 0.0432 (7) | |
N4 | 0.4954 (2) | 0.6660 (2) | 0.4389 (3) | 0.0408 (7) | |
C1 | 0.1774 (4) | 0.7752 (4) | 0.0167 (4) | 0.0558 (10) | |
C2 | 0.1821 (4) | 0.8892 (4) | 0.0354 (5) | 0.0755 (14) | |
H2 | 0.2464 | 0.9502 | 0.0955 | 0.091* | |
C3 | 0.0925 (5) | 0.9108 (5) | −0.0347 (6) | 0.0900 (17) | |
H3 | 0.0971 | 0.9865 | −0.0215 | 0.108* | |
C4 | −0.0050 (5) | 0.8223 (5) | −0.1247 (6) | 0.0900 (17) | |
H4 | −0.0641 | 0.8379 | −0.1732 | 0.108* | |
C5 | −0.0128 (4) | 0.7132 (4) | −0.1409 (5) | 0.0703 (13) | |
H5 | −0.0794 | 0.6545 | −0.1992 | 0.084* | |
C6 | 0.0777 (3) | 0.6856 (4) | −0.0714 (4) | 0.0529 (10) | |
C7 | 0.0635 (3) | 0.5673 (4) | −0.0968 (3) | 0.0502 (10) | |
H7 | −0.0032 | 0.5130 | −0.1613 | 0.060* | |
C8 | 0.1129 (3) | 0.4083 (3) | −0.0722 (3) | 0.0434 (9) | |
C9 | 0.0074 (3) | 0.3275 (4) | −0.1464 (4) | 0.0544 (10) | |
H9 | −0.0557 | 0.3503 | −0.1787 | 0.065* | |
C10 | −0.0034 (4) | 0.2133 (4) | −0.1720 (4) | 0.0692 (13) | |
H10 | −0.0740 | 0.1590 | −0.2226 | 0.083* | |
C11 | 0.0890 (4) | 0.1786 (4) | −0.1238 (4) | 0.0688 (13) | |
H11 | 0.0800 | 0.1016 | −0.1404 | 0.083* | |
C12 | 0.1933 (4) | 0.2558 (4) | −0.0520 (4) | 0.0597 (11) | |
H12 | 0.2553 | 0.2313 | −0.0203 | 0.072* | |
C13 | 0.2079 (3) | 0.3717 (3) | −0.0258 (3) | 0.0426 (9) | |
C14 | 0.4083 (3) | 0.4325 (4) | 0.0679 (4) | 0.0511 (10) | |
H14 | 0.4054 | 0.3534 | 0.0367 | 0.061* | |
C15 | 0.5183 (3) | 0.5133 (4) | 0.1349 (3) | 0.0508 (10) | |
C16 | 0.6140 (4) | 0.4682 (5) | 0.1558 (4) | 0.0675 (13) | |
H16 | 0.6028 | 0.3884 | 0.1278 | 0.081* | |
C17 | 0.7222 (4) | 0.5385 (6) | 0.2158 (5) | 0.0794 (16) | |
H17 | 0.7839 | 0.5074 | 0.2313 | 0.095* | |
C18 | 0.7388 (4) | 0.6556 (6) | 0.2532 (4) | 0.0799 (16) | |
H18 | 0.8125 | 0.7031 | 0.2921 | 0.096* | |
C19 | 0.6498 (4) | 0.7042 (5) | 0.2346 (4) | 0.0702 (13) | |
H19 | 0.6635 | 0.7838 | 0.2604 | 0.084* | |
C20 | 0.5363 (3) | 0.6337 (4) | 0.1761 (4) | 0.0548 (11) | |
C21 | 0.1505 (3) | 0.7323 (4) | 0.4700 (4) | 0.0517 (10) | |
C22 | 0.0402 (4) | 0.7060 (4) | 0.4609 (4) | 0.0624 (12) | |
H22 | −0.0027 | 0.6284 | 0.4162 | 0.075* | |
C23 | −0.0049 (4) | 0.7924 (5) | 0.5166 (5) | 0.0818 (16) | |
H23 | −0.0777 | 0.7725 | 0.5099 | 0.098* | |
C24 | 0.0557 (5) | 0.9092 (5) | 0.5830 (6) | 0.101 (2) | |
H24 | 0.0229 | 0.9676 | 0.6177 | 0.121* | |
C25 | 0.1636 (4) | 0.9372 (4) | 0.5965 (5) | 0.0924 (18) | |
H25 | 0.2060 | 1.0151 | 0.6449 | 0.111* | |
C26 | 0.2139 (4) | 0.8500 (4) | 0.5382 (4) | 0.0590 (11) | |
C27 | 0.3295 (4) | 0.8878 (4) | 0.5621 (4) | 0.0578 (11) | |
H27 | 0.3662 | 0.9668 | 0.6161 | 0.069* | |
C28 | 0.5039 (3) | 0.8682 (3) | 0.5481 (3) | 0.0424 (9) | |
C29 | 0.5628 (3) | 0.9868 (3) | 0.6164 (4) | 0.0525 (10) | |
H29 | 0.5259 | 1.0428 | 0.6464 | 0.063* | |
C30 | 0.6742 (4) | 1.0215 (4) | 0.6398 (4) | 0.0614 (11) | |
H30 | 0.7124 | 1.1007 | 0.6847 | 0.074* | |
C31 | 0.7297 (4) | 0.9379 (4) | 0.5960 (4) | 0.0645 (12) | |
H31 | 0.8055 | 0.9614 | 0.6125 | 0.077* | |
C32 | 0.6732 (3) | 0.8196 (4) | 0.5278 (4) | 0.0558 (11) | |
H32 | 0.7105 | 0.7644 | 0.4972 | 0.067* | |
C33 | 0.5609 (3) | 0.7839 (3) | 0.5052 (3) | 0.0427 (9) | |
C34 | 0.5450 (3) | 0.5817 (3) | 0.4215 (3) | 0.0449 (9) | |
H34 | 0.6239 | 0.6026 | 0.4540 | 0.054* | |
C35 | 0.4890 (3) | 0.4598 (3) | 0.3569 (3) | 0.0432 (9) | |
C36 | 0.5582 (4) | 0.3811 (3) | 0.3384 (4) | 0.0558 (10) | |
H36 | 0.6362 | 0.4106 | 0.3696 | 0.067* | |
C37 | 0.5117 (4) | 0.2625 (4) | 0.2752 (4) | 0.0658 (12) | |
H37 | 0.5577 | 0.2118 | 0.2625 | 0.079* | |
C38 | 0.3965 (4) | 0.2190 (4) | 0.2305 (4) | 0.0693 (13) | |
H38 | 0.3649 | 0.1384 | 0.1866 | 0.083* | |
C39 | 0.3272 (4) | 0.2930 (4) | 0.2499 (4) | 0.0691 (13) | |
H39 | 0.2498 | 0.2615 | 0.2209 | 0.083* | |
C40 | 0.3718 (3) | 0.4161 (3) | 0.3133 (4) | 0.0503 (10) | |
C41 | 0.1861 (5) | 0.7092 (5) | 0.7313 (5) | 0.0967 (18) | |
H41A | 0.1500 | 0.7682 | 0.7646 | 0.145* | |
H41B | 0.2180 | 0.7274 | 0.6859 | 0.145* | |
H41C | 0.2453 | 0.7068 | 0.7952 | 0.145* | |
H7WB | 0.1494 | 0.5026 | 0.5366 | 0.116* | |
H7WA | 0.1725 | 0.4961 | 0.4429 | 0.116* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Fe1 | 0.0386 (3) | 0.0414 (3) | 0.0389 (3) | 0.0049 (3) | 0.0090 (2) | 0.0168 (3) |
Fe2 | 0.0351 (3) | 0.0388 (3) | 0.0406 (3) | 0.0037 (2) | 0.0097 (2) | 0.0171 (3) |
O1 | 0.0621 (19) | 0.0489 (16) | 0.0628 (19) | 0.0002 (14) | 0.0035 (15) | 0.0300 (15) |
O2 | 0.0445 (16) | 0.0534 (17) | 0.071 (2) | 0.0017 (14) | 0.0187 (15) | 0.0212 (15) |
O3 | 0.0485 (16) | 0.0500 (16) | 0.0631 (18) | 0.0052 (14) | 0.0257 (14) | 0.0227 (14) |
O4 | 0.0406 (15) | 0.0438 (15) | 0.086 (2) | 0.0047 (13) | 0.0159 (15) | 0.0312 (15) |
O5 | 0.0489 (15) | 0.0534 (15) | 0.0409 (15) | 0.0117 (13) | 0.0140 (12) | 0.0198 (13) |
O6 | 0.082 (3) | 0.105 (3) | 0.094 (3) | 0.013 (2) | 0.025 (2) | 0.044 (2) |
O7 | 0.104 (3) | 0.107 (3) | 0.084 (3) | −0.006 (2) | 0.033 (2) | 0.048 (2) |
O8 | 0.151 (9) | 0.083 (6) | 0.102 (7) | 0.030 (6) | 0.061 (7) | 0.064 (6) |
O9 | 0.056 (6) | 0.060 (6) | 0.130 (9) | 0.008 (5) | 0.036 (6) | 0.063 (6) |
O10 | 0.069 (14) | 0.057 (12) | 0.036 (10) | −0.037 (10) | 0.033 (8) | −0.009 (7) |
N1 | 0.0367 (17) | 0.0464 (18) | 0.0414 (18) | 0.0088 (15) | 0.0140 (14) | 0.0206 (15) |
N2 | 0.0392 (17) | 0.0455 (17) | 0.0414 (18) | 0.0088 (15) | 0.0137 (14) | 0.0218 (15) |
N3 | 0.0376 (17) | 0.0428 (17) | 0.0430 (18) | 0.0070 (15) | 0.0128 (15) | 0.0204 (14) |
N4 | 0.0364 (16) | 0.0388 (16) | 0.0364 (17) | 0.0026 (14) | 0.0103 (14) | 0.0154 (14) |
C1 | 0.064 (3) | 0.051 (2) | 0.057 (3) | 0.015 (2) | 0.025 (2) | 0.032 (2) |
C2 | 0.077 (3) | 0.064 (3) | 0.087 (4) | 0.015 (3) | 0.026 (3) | 0.046 (3) |
C3 | 0.092 (4) | 0.077 (4) | 0.136 (5) | 0.038 (3) | 0.053 (4) | 0.075 (4) |
C4 | 0.072 (4) | 0.097 (4) | 0.128 (5) | 0.038 (3) | 0.032 (4) | 0.082 (4) |
C5 | 0.053 (3) | 0.078 (3) | 0.083 (3) | 0.026 (3) | 0.021 (2) | 0.047 (3) |
C6 | 0.054 (3) | 0.056 (2) | 0.054 (3) | 0.020 (2) | 0.023 (2) | 0.031 (2) |
C7 | 0.037 (2) | 0.058 (2) | 0.042 (2) | 0.0086 (19) | 0.0101 (17) | 0.0205 (19) |
C8 | 0.039 (2) | 0.040 (2) | 0.039 (2) | 0.0032 (17) | 0.0140 (17) | 0.0138 (17) |
C9 | 0.040 (2) | 0.056 (3) | 0.050 (2) | 0.001 (2) | 0.0145 (19) | 0.019 (2) |
C10 | 0.057 (3) | 0.052 (3) | 0.063 (3) | −0.014 (2) | 0.015 (2) | 0.012 (2) |
C11 | 0.075 (3) | 0.043 (2) | 0.072 (3) | 0.000 (2) | 0.024 (3) | 0.024 (2) |
C12 | 0.065 (3) | 0.049 (2) | 0.060 (3) | 0.012 (2) | 0.021 (2) | 0.029 (2) |
C13 | 0.044 (2) | 0.040 (2) | 0.035 (2) | 0.0047 (18) | 0.0138 (17) | 0.0149 (17) |
C14 | 0.054 (3) | 0.057 (2) | 0.051 (2) | 0.020 (2) | 0.022 (2) | 0.033 (2) |
C15 | 0.038 (2) | 0.073 (3) | 0.043 (2) | 0.013 (2) | 0.0155 (19) | 0.032 (2) |
C16 | 0.057 (3) | 0.105 (4) | 0.067 (3) | 0.036 (3) | 0.033 (2) | 0.057 (3) |
C17 | 0.043 (3) | 0.146 (5) | 0.062 (3) | 0.033 (3) | 0.022 (2) | 0.061 (4) |
C18 | 0.038 (3) | 0.131 (5) | 0.049 (3) | 0.004 (3) | 0.013 (2) | 0.035 (3) |
C19 | 0.047 (3) | 0.083 (3) | 0.051 (3) | −0.005 (3) | 0.016 (2) | 0.019 (2) |
C20 | 0.038 (2) | 0.076 (3) | 0.043 (2) | 0.007 (2) | 0.0164 (19) | 0.026 (2) |
C21 | 0.040 (2) | 0.062 (3) | 0.045 (2) | 0.007 (2) | 0.0121 (19) | 0.026 (2) |
C22 | 0.044 (2) | 0.075 (3) | 0.056 (3) | 0.009 (2) | 0.018 (2) | 0.027 (2) |
C23 | 0.042 (3) | 0.102 (4) | 0.072 (3) | 0.013 (3) | 0.020 (3) | 0.024 (3) |
C24 | 0.058 (3) | 0.092 (4) | 0.119 (5) | 0.027 (3) | 0.044 (3) | 0.022 (4) |
C25 | 0.067 (3) | 0.059 (3) | 0.113 (5) | 0.012 (3) | 0.040 (3) | 0.012 (3) |
C26 | 0.046 (2) | 0.055 (3) | 0.067 (3) | 0.013 (2) | 0.024 (2) | 0.023 (2) |
C27 | 0.051 (2) | 0.043 (2) | 0.059 (3) | 0.006 (2) | 0.018 (2) | 0.015 (2) |
C28 | 0.040 (2) | 0.042 (2) | 0.035 (2) | 0.0020 (17) | 0.0100 (17) | 0.0169 (17) |
C29 | 0.054 (3) | 0.039 (2) | 0.051 (2) | 0.0057 (19) | 0.019 (2) | 0.0158 (18) |
C30 | 0.052 (3) | 0.047 (2) | 0.056 (3) | −0.007 (2) | 0.014 (2) | 0.013 (2) |
C31 | 0.042 (2) | 0.058 (3) | 0.070 (3) | −0.006 (2) | 0.020 (2) | 0.019 (2) |
C32 | 0.042 (2) | 0.048 (2) | 0.057 (3) | 0.0008 (19) | 0.018 (2) | 0.014 (2) |
C33 | 0.038 (2) | 0.041 (2) | 0.036 (2) | −0.0014 (17) | 0.0097 (17) | 0.0158 (17) |
C34 | 0.039 (2) | 0.049 (2) | 0.043 (2) | 0.0033 (18) | 0.0144 (18) | 0.0241 (18) |
C35 | 0.048 (2) | 0.041 (2) | 0.038 (2) | 0.0071 (18) | 0.0160 (18) | 0.0213 (17) |
C36 | 0.060 (3) | 0.049 (2) | 0.059 (3) | 0.017 (2) | 0.024 (2) | 0.029 (2) |
C37 | 0.077 (3) | 0.058 (3) | 0.070 (3) | 0.030 (3) | 0.034 (3) | 0.035 (2) |
C38 | 0.076 (3) | 0.040 (2) | 0.070 (3) | 0.011 (2) | 0.014 (3) | 0.024 (2) |
C39 | 0.052 (3) | 0.050 (3) | 0.080 (3) | 0.001 (2) | 0.005 (2) | 0.031 (2) |
C40 | 0.048 (2) | 0.041 (2) | 0.052 (2) | 0.0055 (19) | 0.0114 (19) | 0.0236 (19) |
C41 | 0.082 (4) | 0.111 (5) | 0.085 (4) | 0.017 (4) | 0.027 (3) | 0.047 (4) |
Fe1—O5 | 1.786 (3) | C12—H12 | 0.9300 |
Fe1—O1 | 1.912 (3) | C14—C15 | 1.429 (5) |
Fe1—O2 | 1.921 (3) | C14—H14 | 0.9300 |
Fe1—N2 | 2.106 (3) | C15—C20 | 1.404 (6) |
Fe1—N1 | 2.123 (3) | C15—C16 | 1.413 (5) |
Fe2—O5 | 1.784 (3) | C16—C17 | 1.365 (7) |
Fe2—O4 | 1.919 (3) | C16—H16 | 0.9300 |
Fe2—O3 | 1.922 (3) | C17—C18 | 1.372 (7) |
Fe2—N3 | 2.116 (3) | C17—H17 | 0.9300 |
Fe2—N4 | 2.119 (3) | C18—C19 | 1.366 (7) |
O1—C1 | 1.329 (5) | C18—H18 | 0.9300 |
O2—C20 | 1.325 (5) | C19—C20 | 1.421 (6) |
O3—C21 | 1.327 (5) | C19—H19 | 0.9300 |
O4—C40 | 1.325 (5) | C21—C26 | 1.403 (6) |
O6—C41 | 1.424 (6) | C21—C22 | 1.405 (6) |
O6—H6 | 0.8200 | C22—C23 | 1.364 (6) |
O7—H7WB | 0.9910 | C22—H22 | 0.9300 |
O7—H7WA | 0.9611 | C23—C24 | 1.386 (7) |
O8—O10 | 1.063 (14) | C23—H23 | 0.9300 |
O8—O9 | 1.280 (12) | C24—C25 | 1.356 (7) |
O9—O10 | 1.18 (2) | C24—H24 | 0.9300 |
N1—C7 | 1.307 (5) | C25—C26 | 1.430 (6) |
N1—C8 | 1.416 (5) | C25—H25 | 0.9300 |
N2—C14 | 1.304 (5) | C26—C27 | 1.428 (6) |
N2—C13 | 1.409 (5) | C27—H27 | 0.9300 |
N3—C27 | 1.301 (5) | C28—C29 | 1.398 (5) |
N3—C28 | 1.418 (5) | C28—C33 | 1.405 (5) |
N4—C34 | 1.300 (5) | C29—C30 | 1.371 (6) |
N4—C33 | 1.416 (4) | C29—H29 | 0.9300 |
C1—C6 | 1.403 (6) | C30—C31 | 1.388 (6) |
C1—C2 | 1.407 (6) | C30—H30 | 0.9300 |
C2—C3 | 1.370 (7) | C31—C32 | 1.387 (6) |
C2—H2 | 0.9300 | C31—H31 | 0.9300 |
C3—C4 | 1.386 (8) | C32—C33 | 1.387 (5) |
C3—H3 | 0.9300 | C32—H32 | 0.9300 |
C4—C5 | 1.351 (7) | C34—C35 | 1.427 (5) |
C4—H4 | 0.9300 | C34—H34 | 0.9300 |
C5—C6 | 1.421 (6) | C35—C40 | 1.400 (5) |
C5—H5 | 0.9300 | C35—C36 | 1.418 (5) |
C6—C7 | 1.428 (6) | C36—C37 | 1.369 (6) |
C7—H7 | 0.9300 | C36—H36 | 0.9300 |
C8—C9 | 1.387 (5) | C37—C38 | 1.374 (6) |
C8—C13 | 1.408 (5) | C37—H37 | 0.9300 |
C9—C10 | 1.376 (6) | C38—C39 | 1.379 (6) |
C9—H9 | 0.9300 | C38—H38 | 0.9300 |
C10—C11 | 1.374 (7) | C39—C40 | 1.416 (6) |
C10—H10 | 0.9300 | C39—H39 | 0.9300 |
C11—C12 | 1.357 (6) | C41—H41A | 0.9600 |
C11—H11 | 0.9300 | C41—H41B | 0.9600 |
C12—C13 | 1.393 (5) | C41—H41C | 0.9600 |
O5—Fe1—O1 | 109.47 (13) | C20—C15—C16 | 118.4 (4) |
O5—Fe1—O2 | 109.06 (13) | C20—C15—C14 | 123.6 (4) |
O1—Fe1—O2 | 89.13 (13) | C16—C15—C14 | 117.9 (4) |
O5—Fe1—N2 | 102.31 (12) | C17—C16—C15 | 121.9 (5) |
O1—Fe1—N2 | 147.27 (13) | C17—C16—H16 | 119.0 |
O2—Fe1—N2 | 87.79 (13) | C15—C16—H16 | 119.0 |
O5—Fe1—N1 | 106.82 (12) | C16—C17—C18 | 119.1 (5) |
O1—Fe1—N1 | 87.13 (12) | C16—C17—H17 | 120.4 |
O2—Fe1—N1 | 143.05 (12) | C18—C17—H17 | 120.4 |
N2—Fe1—N1 | 76.19 (12) | C19—C18—C17 | 121.7 (5) |
O5—Fe2—O4 | 110.14 (13) | C19—C18—H18 | 119.1 |
O5—Fe2—O3 | 107.68 (12) | C17—C18—H18 | 119.1 |
O4—Fe2—O3 | 90.01 (12) | C18—C19—C20 | 120.3 (5) |
O5—Fe2—N3 | 102.33 (12) | C18—C19—H19 | 119.9 |
O4—Fe2—N3 | 146.57 (13) | C20—C19—H19 | 119.9 |
O3—Fe2—N3 | 87.54 (12) | O2—C20—C15 | 123.3 (4) |
O5—Fe2—N4 | 106.81 (12) | O2—C20—C19 | 118.2 (4) |
O4—Fe2—N4 | 87.08 (12) | C15—C20—C19 | 118.5 (4) |
O3—Fe2—N4 | 144.17 (12) | O3—C21—C26 | 122.6 (3) |
N3—Fe2—N4 | 75.93 (12) | O3—C21—C22 | 118.8 (4) |
C1—O1—Fe1 | 133.1 (3) | C26—C21—C22 | 118.5 (4) |
C20—O2—Fe1 | 131.4 (3) | C23—C22—C21 | 121.0 (5) |
C21—O3—Fe2 | 130.6 (3) | C23—C22—H22 | 119.5 |
C40—O4—Fe2 | 131.8 (3) | C21—C22—H22 | 119.5 |
Fe2—O5—Fe1 | 146.68 (16) | C22—C23—C24 | 121.4 (5) |
C41—O6—H6 | 109.5 | C22—C23—H23 | 119.3 |
H7WB—O7—H7WA | 90.6 | C24—C23—H23 | 119.3 |
O10—O8—O9 | 59.4 (14) | C25—C24—C23 | 119.0 (5) |
O10—O9—O8 | 51.1 (9) | C25—C24—H24 | 120.5 |
O8—O10—O9 | 69.5 (12) | C23—C24—H24 | 120.5 |
C7—N1—C8 | 121.2 (3) | C24—C25—C26 | 121.7 (5) |
C7—N1—Fe1 | 125.4 (3) | C24—C25—H25 | 119.2 |
C8—N1—Fe1 | 113.4 (2) | C26—C25—H25 | 119.2 |
C14—N2—C13 | 120.9 (3) | C21—C26—C27 | 124.1 (4) |
C14—N2—Fe1 | 124.9 (3) | C21—C26—C25 | 118.3 (4) |
C13—N2—Fe1 | 114.2 (2) | C27—C26—C25 | 117.3 (4) |
C27—N3—C28 | 121.3 (3) | N3—C27—C26 | 126.0 (4) |
C27—N3—Fe2 | 123.7 (3) | N3—C27—H27 | 117.0 |
C28—N3—Fe2 | 114.8 (2) | C26—C27—H27 | 117.0 |
C34—N4—C33 | 120.2 (3) | C29—C28—C33 | 119.3 (3) |
C34—N4—Fe2 | 125.6 (2) | C29—C28—N3 | 126.0 (3) |
C33—N4—Fe2 | 114.2 (2) | C33—C28—N3 | 114.7 (3) |
O1—C1—C6 | 123.0 (4) | C30—C29—C28 | 120.9 (4) |
O1—C1—C2 | 118.1 (4) | C30—C29—H29 | 119.6 |
C6—C1—C2 | 118.8 (4) | C28—C29—H29 | 119.6 |
C3—C2—C1 | 120.3 (5) | C29—C30—C31 | 119.6 (4) |
C3—C2—H2 | 119.9 | C29—C30—H30 | 120.2 |
C1—C2—H2 | 119.9 | C31—C30—H30 | 120.2 |
C2—C3—C4 | 121.5 (5) | C32—C31—C30 | 120.7 (4) |
C2—C3—H3 | 119.2 | C32—C31—H31 | 119.7 |
C4—C3—H3 | 119.2 | C30—C31—H31 | 119.7 |
C5—C4—C3 | 119.0 (5) | C33—C32—C31 | 119.9 (4) |
C5—C4—H4 | 120.5 | C33—C32—H32 | 120.0 |
C3—C4—H4 | 120.5 | C31—C32—H32 | 120.0 |
C4—C5—C6 | 121.9 (5) | C32—C33—C28 | 119.6 (3) |
C4—C5—H5 | 119.1 | C32—C33—N4 | 125.0 (3) |
C6—C5—H5 | 119.1 | C28—C33—N4 | 115.4 (3) |
C1—C6—C5 | 118.4 (4) | N4—C34—C35 | 125.7 (3) |
C1—C6—C7 | 123.4 (4) | N4—C34—H34 | 117.2 |
C5—C6—C7 | 118.2 (4) | C35—C34—H34 | 117.2 |
N1—C7—C6 | 126.0 (4) | C40—C35—C36 | 119.8 (4) |
N1—C7—H7 | 117.0 | C40—C35—C34 | 123.4 (3) |
C6—C7—H7 | 117.0 | C36—C35—C34 | 116.8 (3) |
C9—C8—C13 | 119.3 (4) | C37—C36—C35 | 121.0 (4) |
C9—C8—N1 | 125.4 (4) | C37—C36—H36 | 119.5 |
C13—C8—N1 | 115.2 (3) | C35—C36—H36 | 119.5 |
C10—C9—C8 | 119.7 (4) | C36—C37—C38 | 119.6 (4) |
C10—C9—H9 | 120.1 | C36—C37—H37 | 120.2 |
C8—C9—H9 | 120.1 | C38—C37—H37 | 120.2 |
C11—C10—C9 | 120.7 (4) | C37—C38—C39 | 121.0 (4) |
C11—C10—H10 | 119.6 | C37—C38—H38 | 119.5 |
C9—C10—H10 | 119.6 | C39—C38—H38 | 119.5 |
C12—C11—C10 | 120.6 (4) | C38—C39—C40 | 121.1 (4) |
C12—C11—H11 | 119.7 | C38—C39—H39 | 119.4 |
C10—C11—H11 | 119.7 | C40—C39—H39 | 119.5 |
C11—C12—C13 | 120.3 (4) | O4—C40—C35 | 123.5 (3) |
C11—C12—H12 | 119.9 | O4—C40—C39 | 118.9 (4) |
C13—C12—H12 | 119.8 | C35—C40—C39 | 117.6 (4) |
C12—C13—C8 | 119.3 (4) | O6—C41—H41A | 109.5 |
C12—C13—N2 | 125.6 (4) | O6—C41—H41B | 109.5 |
C8—C13—N2 | 115.1 (3) | H41A—C41—H41B | 109.5 |
N2—C14—C15 | 126.0 (4) | O6—C41—H41C | 109.5 |
N2—C14—H14 | 117.0 | H41A—C41—H41C | 109.5 |
C15—C14—H14 | 117.0 | H41B—C41—H41C | 109.5 |
D—H···A | D—H | H···A | D···A | D—H···A |
O6—H6···O7i | 0.82 | 2.15 | 2.916 (6) | 156 |
O7—H7WB···O6 | 0.99 | 1.87 | 2.808 (6) | 158 |
O7—H7WA···O3 | 0.96 | 2.17 | 3.090 (5) | 160 |
O7—H7WA···O4 | 0.96 | 2.62 | 3.330 (5) | 131 |
Symmetry code: (i) −x, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | [Fe2(C20H14N2O2)2O]·CH4O·2H2O |
Mr | 824.44 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 298 |
a, b, c (Å) | 13.042 (3), 13.249 (3), 13.724 (3) |
α, β, γ (°) | 116.60 (3), 110.50 (3), 93.80 (3) |
V (Å3) | 1914.4 (12) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.82 |
Crystal size (mm) | 0.22 × 0.20 × 0.20 |
Data collection | |
Diffractometer | Rigaku Model? CCD area-detector |
Absorption correction | Multi-scan (ABSCOR; Higashi, 1995) |
Tmin, Tmax | 0.841, 0.854 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 15784, 6858, 4753 |
Rint | 0.040 |
(sin θ/λ)max (Å−1) | 0.602 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.051, 0.158, 1.05 |
No. of reflections | 6858 |
No. of parameters | 519 |
No. of restraints | 4 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.59, −0.34 |
Computer programs: CrystalClear (Rigaku, 2008), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg, 2006), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
O6—H6···O7i | 0.82 | 2.15 | 2.916 (6) | 156.0 |
O7—H7WB···O6 | 0.99 | 1.87 | 2.808 (6) | 157.7 |
O7—H7WA···O3 | 0.96 | 2.17 | 3.090 (5) | 159.6 |
O7—H7WA···O4 | 0.96 | 2.62 | 3.330 (5) | 130.6 |
Symmetry code: (i) −x, −y+1, −z+1. |
Acknowledgements
The authors thank the Natural Science Foundation of Jiangsu Province (No. BK2009196) for financial support.
References
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µ-Oxo-diiron(III) complexes are of considerable interest to chemists and biologists because of their interesting electronic structures and the magnetic interactions between the two iron(III) centers, and the role played by the oxo-bridged dinuclear iron centres in proteins (Kurtz et al., 1990; Vincent et al., 1990; Oyaizu et al., 2001). The Fe—Fe distances and the corresponding the Fe—O—Fe bond lengths and the angles are the most important factors that determine the electronic and magnetic properties of these complexes (Reedijk et al., 1999). It is important to note that the crystal structure of µ-oxo-bridged ferric salphen dimers [salphenH2= N,N'-o-phenylenebis(salicylideneimine)] depend strongly on the presence and type of lattice solvent molecules: [{FeIII(salphen)}2O].CH2Cl2.C4H10O (Oyaizu et al., 2001); [{FeIII(salphen)}2O].DMSO (Ashmawy et al., 1991) and [{FeIII(salphen)}2O].C4H8O2 (Elmali et al., 1993). By using a different solvent system, we obtained a new methanol dihydrate solvate of the µ-oxo-diiron(III) complex, [{FeIII(salphen)}2O].CH3OH.2H2O. Herein, the crystal structure of this solvate is presented.
The title complex is composed of one µ-oxo-diiron(III) unit of [{FeIII(salphen)}2O], one methanol molecule and two H2O molecules (Fig. 1). Each iron(III) atom, surrounded by each two coordinating N and O atoms from the salphen ligand, extends outwards of the mean N2O2 plane towards the bridging oxygen atom by as much as 0.588 (3) and 0.583 (3) Å for Fe(1) and Fe(2), respectively. The iron atoms thus substantially protrude from the ligand planes and show a typical five-coordinate square-pyramidal geometry. The Fe—O (bridging) bond lengths are 1.786 (3) and 1.784 (3) Å for Fe(1) and Fe(2), respectively. The Fe—O—Fe angle of 146.68 (16)° is almost equal to the value of 146.7 (4)° reported for [{FeIII(salphen)}2O].DMSO (Ashmawy et al., 1991), and is bigger than the values of 141 (1)° and 145.0 (3)° reported for [{FeIII(salphen)}2O].CH2Cl2.C4H10O (Oyaizu et al., 2001) and [{FeIII(salphen)}2O].C4H8O2 (Elmali et al., 1993), respectively. The Fe···Fe distance of 3.420 (3) Å is consistent with the values (3.35–3.55 Å) reported for µ-oxo-diiron(III) complexes with macrocyclic ligands (Oyaizu et al., 2001). One of the two interstitial water molecules in the structure was found to be svererly disordered and has been refined as disordered over three positions with occupancies of 43.9 (4)%, 37 (1)% and 19 (1)% for O8, O9 and O10, respectively. Hydrogen atoms for the disordered water molecule could not be located and were omitted from the refinement.
There are some hydrogen-bonding interactions between methanol and water molecules, and between the water molecules and the salphen ligand. These hydrogen bonding interactions lead to a group of four oxygen atoms - two water and two methanol molecules - that are arranged around a crystallographic inversion center in a quadratic square pattern. The water molecules of the unit form additional bifurcated hydrogen bonds twoards the two oxygen atoms (O3, O4) of a salphen ligand of adjacent [{FeIII(salphen)}2O] complexes thus binding the complexes together by H-bonds via the square H2O/MeOH units (Table 1, Fig. 2). The oxygen atoms of the other salphen ligand of the complex (O1, O2) show signs of hydrogen bonding interactions with the disordered water molecule.