metal-organic compounds
Bis(μ-4-fluoro-2,6-diformylphenolato)bis[diaquanickel(II)] dichloride
aKey Laboratory for Green Chemical Processes of the Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, People's Republic of China, bHubei Key Laboratory of Biologic Resources Protection and Utilization, Hubei Institute for Nationalities, Wuhan Institute of Technology, Enshi 445000, People's Republic of China, and cState Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, Nanjing University, Nanjing 210093, People's Republic of China
*Correspondence e-mail: zhiqpan@163.com
In the title dinuclear nickel(II) complex, [Ni2(C8H4FO3)2(H2O)4]Cl2, synthesized by the reaction between 4-fluoro-2,6-diformylphenol and nickel(II) chloride in methanol, the coordination cation is located on an inversion center and the NiII atom adopts a slightly distorted octahedral coordination geometry. The two Ni atoms are bridged by two phenolate O atoms and the intramolecular Ni⋯Ni distance is 3.0751 (9) Å. The is stabilized by O—H⋯Cl hydrogen bonds.
Related literature
For the synthesis of related compounds and their properties, see: Thompson et al. (1996); Zhou et al. (2005); Raimondi et al. (2004); Taniguchi (1984); Mohanta et al. (1998); Wang et al. (1997). For related structures, see: Adhikary et al. (1987); Zhou et al. (2007).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536810016284/gk2267sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810016284/gk2267Isup2.hkl
2, 6-Diformyl-4-fluorophenol was prepared according to the literature method (Taniguchi, 1984). To a solution of 2,6-diformyl-4-fluorinphenol (1 mmol, 0.17 g) in absolute methanol (10 ml) was added a methanol solution (10 ml) containing NiCl22H2O (1 mmol, 0.17 g). The solution was stirred vigorously for 24 h at room temperature and filtrated. The dark-green block-shaped crystals suitable for X-ray
were obtained by slow evaporation of solvent over a period of two weeks.The H atoms of water molecules were found in a difference Fourier map, and the O—H distances were restrained to 0.85 (1) Å; their temperature factor was set to 1.2Ueq(O). All other H atoms were placed in calculated positions with C—H = 0.93 Å and included in the
in the riding-model approximation with U(H) set to 1.2Ueq(C).Phenoxide-bridged dinuclear complexes have been extensively studied for several decades, most of them were derived from the cyclocondensation of 2,6-diformyl-4-R-phenol and alkyldiamine in the presence of metal ions (Thompson et al.,1996; Zhou et al., 2005; Raimondi et al., 2004).With short distances between the two metal ions in the complexes, they show special electrical and magnetic properties (Mohanta et al., 1998; Wang et al., 1997). Adhikary et al. reported a phenoxide-bridged dinuclear nickel(II) complex, obtained directly from the mixture of 2,6-diformyl-4-methyl-phenol and nickel(II) perchlorate (Adhikary et al., 1987). Here we report the
of a new dinuclear NiII complex with fluorine substituent in the phenyl ring. The diference between the title complex and the one Adhikary reported is that they have different substituents in the phenyl ring and different counter-anions.The coordination cation consists of two 2,6-diformyl-4-flurophenolate ligands, four water molecules, two NiII ions (Fig. 1). The chlorine ions do not participate in coordination to the Ni atoms. Each Ni atom has a slightly distorted octahedral coordination geometry and it deviates from the equatorial plane defined by four coordinating oxygen atoms of the organic ligand by 0.0266 (4) Å. The axial positions are occupied by two water molecules with Ni–O distances of 2.057 (4) Å and 2.067 (4) Å.The Ni—O distance in the basal plane is in the range of 1.995 (4) Å - 2.019 (3) Å. The presence of the two bridging phenolate O atoms gives rise to a short metal-metal contact of 3.0751 (9) Å that is slightly longer than those of binuclear nickel(II) complexes with macrocyclic phenoxo-bridging ligands (Zhou et al., 2007).
For the synthesis of related compounds and their properties, see: Thompson et al. (1996); Zhou et al. (2005); Raimondi et al. (2004); Taniguchi (1984); Mohanta et al. (1998); Wang et al. (1997). For related structures, see: Adhikary et al. (1987); Zhou et al. (2007).
Data collection: SMART (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).[Ni2(C8H4FO3)2(H2O)4]Cl2 | F(000) = 600 |
Mr = 594.61 | Dx = 1.922 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 3902 reflections |
a = 8.3299 (14) Å | θ = 2.2–28.0° |
b = 13.576 (2) Å | µ = 2.16 mm−1 |
c = 9.9965 (17) Å | T = 291 K |
β = 114.623 (3)° | Block, green |
V = 1027.6 (3) Å3 | 0.26 × 0.22 × 0.20 mm |
Z = 2 |
Bruker SMART APEX CCD diffractometer | 2018 independent reflections |
Radiation source: sealed tube | 1708 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.041 |
phi and ω scans | θmax = 26.0°, θmin = 2.7° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −10→7 |
Tmin = 0.603, Tmax = 0.672 | k = −15→16 |
5827 measured reflections | l = −8→12 |
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) = 0.119 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | w = 1/[σ2(Fo2) + (0.06P)2 + 1.99P] where P = (Fo2 + 2Fc2)/3 |
2018 reflections | (Δ/σ)max < 0.001 |
157 parameters | Δρmax = 0.42 e Å−3 |
4 restraints | Δρmin = −0.94 e Å−3 |
[Ni2(C8H4FO3)2(H2O)4]Cl2 | V = 1027.6 (3) Å3 |
Mr = 594.61 | Z = 2 |
Monoclinic, P21/c | Mo Kα radiation |
a = 8.3299 (14) Å | µ = 2.16 mm−1 |
b = 13.576 (2) Å | T = 291 K |
c = 9.9965 (17) Å | 0.26 × 0.22 × 0.20 mm |
β = 114.623 (3)° |
Bruker SMART APEX CCD diffractometer | 2018 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 1708 reflections with I > 2σ(I) |
Tmin = 0.603, Tmax = 0.672 | Rint = 0.041 |
5827 measured reflections |
R[F2 > 2σ(F2)] = 0.051 | 4 restraints |
wR(F2) = 0.119 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | Δρmax = 0.42 e Å−3 |
2018 reflections | Δρmin = −0.94 e Å−3 |
157 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 > 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 | ||
C1 | 0.2077 (6) | 0.3085 (3) | 0.2584 (5) | 0.0349 (11) | |
H1 | 0.1159 | 0.2647 | 0.2095 | 0.042* | |
C2 | 0.2373 (6) | 0.3811 (3) | 0.1689 (5) | 0.0281 (9) | |
C3 | 0.1336 (6) | 0.3705 (3) | 0.0166 (5) | 0.0331 (10) | |
H3 | 0.0559 | 0.3178 | −0.0182 | 0.040* | |
C4 | 0.1475 (7) | 0.4376 (4) | −0.0792 (5) | 0.0401 (12) | |
C5 | 0.2548 (7) | 0.5179 (4) | −0.0329 (5) | 0.0370 (11) | |
H5 | 0.2609 | 0.5630 | −0.1007 | 0.044* | |
C6 | 0.3552 (6) | 0.5318 (3) | 0.1172 (5) | 0.0276 (9) | |
C7 | 0.3474 (5) | 0.4643 (3) | 0.2223 (5) | 0.0228 (8) | |
C8 | 0.4651 (6) | 0.6193 (4) | 0.1539 (6) | 0.0356 (11) | |
H8 | 0.4680 | 0.6545 | 0.0752 | 0.043* | |
Cl1 | 0.16724 (17) | 0.66791 (9) | 0.64475 (15) | 0.0406 (3) | |
F1 | 0.0499 (5) | 0.4245 (3) | −0.2256 (3) | 0.0555 (9) | |
Ni1 | 0.43045 (7) | 0.40202 (4) | 0.53212 (6) | 0.02194 (18) | |
O1 | 0.2874 (4) | 0.2955 (2) | 0.3923 (4) | 0.0318 (7) | |
O2 | 0.4438 (4) | 0.4760 (2) | 0.3627 (3) | 0.0249 (6) | |
O3 | 0.5544 (5) | 0.6519 (2) | 0.2770 (4) | 0.0351 (8) | |
O4 | 0.1900 (5) | 0.4629 (3) | 0.4960 (4) | 0.0415 (8) | |
H4A | 0.201 (8) | 0.502 (4) | 0.565 (5) | 0.050* | |
H4B | 0.116 (6) | 0.417 (3) | 0.484 (7) | 0.050* | |
O5 | 0.6594 (5) | 0.3234 (3) | 0.5759 (4) | 0.0402 (8) | |
H5C | 0.725 (7) | 0.313 (4) | 0.6662 (18) | 0.048* | |
H5A | 0.717 (7) | 0.354 (4) | 0.535 (6) | 0.048* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.034 (2) | 0.032 (2) | 0.034 (3) | −0.0109 (19) | 0.008 (2) | −0.002 (2) |
C2 | 0.024 (2) | 0.025 (2) | 0.035 (2) | −0.0003 (17) | 0.0122 (18) | −0.0051 (18) |
C3 | 0.028 (2) | 0.032 (2) | 0.034 (3) | 0.0002 (19) | 0.0079 (19) | −0.010 (2) |
C4 | 0.050 (3) | 0.042 (3) | 0.019 (2) | 0.012 (2) | 0.006 (2) | −0.001 (2) |
C5 | 0.055 (3) | 0.035 (3) | 0.018 (2) | 0.001 (2) | 0.012 (2) | 0.0028 (19) |
C6 | 0.031 (2) | 0.027 (2) | 0.024 (2) | −0.0020 (17) | 0.0109 (17) | 0.0029 (17) |
C7 | 0.0206 (19) | 0.0228 (19) | 0.028 (2) | 0.0044 (15) | 0.0127 (17) | 0.0059 (17) |
C8 | 0.039 (3) | 0.036 (3) | 0.036 (3) | 0.004 (2) | 0.020 (2) | 0.011 (2) |
Cl1 | 0.0417 (7) | 0.0394 (6) | 0.0449 (7) | 0.0017 (5) | 0.0222 (6) | −0.0033 (5) |
F1 | 0.066 (2) | 0.0570 (19) | 0.0244 (15) | −0.0102 (17) | −0.0007 (14) | −0.0047 (14) |
Ni1 | 0.0241 (3) | 0.0209 (3) | 0.0230 (3) | −0.0028 (2) | 0.0120 (2) | 0.0000 (2) |
O1 | 0.0358 (16) | 0.0266 (16) | 0.0336 (18) | −0.0065 (13) | 0.0149 (14) | −0.0018 (13) |
O2 | 0.0303 (15) | 0.0256 (14) | 0.0188 (14) | −0.0044 (12) | 0.0103 (12) | 0.0019 (11) |
O3 | 0.0455 (19) | 0.0349 (18) | 0.0282 (18) | −0.0055 (15) | 0.0186 (15) | 0.0046 (14) |
O4 | 0.0335 (18) | 0.040 (2) | 0.053 (2) | 0.0004 (15) | 0.0196 (17) | −0.0023 (17) |
O5 | 0.0359 (18) | 0.051 (2) | 0.0361 (19) | 0.0158 (16) | 0.0178 (15) | 0.0147 (17) |
C1—O1 | 1.234 (6) | C8—O3 | 1.226 (6) |
C1—C2 | 1.421 (7) | C8—H8 | 0.9300 |
C1—H1 | 0.9300 | Ni1—O3i | 1.998 (3) |
C2—C3 | 1.410 (6) | Ni1—O2i | 2.007 (3) |
C2—C7 | 1.412 (6) | Ni1—O2 | 2.012 (3) |
C3—C4 | 1.361 (7) | Ni1—O1 | 2.019 (3) |
C3—H3 | 0.9300 | Ni1—O4 | 2.054 (4) |
C4—F1 | 1.358 (5) | Ni1—O5 | 2.067 (3) |
C4—C5 | 1.364 (7) | O2—Ni1i | 2.007 (3) |
C5—C6 | 1.393 (6) | O3—Ni1i | 1.998 (3) |
C5—H5 | 0.9300 | O4—H4A | 0.85 (5) |
C6—C7 | 1.416 (6) | O4—H4B | 0.85 (5) |
C6—C8 | 1.450 (6) | O5—H5C | 0.85 (2) |
C7—O2 | 1.304 (5) | O5—H5A | 0.86 (6) |
O1—C1—C2 | 128.7 (4) | O3i—Ni1—O2 | 169.53 (13) |
O1—C1—H1 | 115.6 | O2i—Ni1—O2 | 80.18 (13) |
C2—C1—H1 | 115.6 | O3i—Ni1—O1 | 100.54 (14) |
C3—C2—C1 | 114.8 (4) | O2i—Ni1—O1 | 169.22 (12) |
C3—C2—C7 | 119.9 (4) | O2—Ni1—O1 | 89.91 (13) |
C1—C2—C7 | 125.0 (4) | O3i—Ni1—O4 | 89.11 (15) |
C4—C3—C2 | 119.9 (4) | O2i—Ni1—O4 | 91.02 (14) |
C4—C3—H3 | 120.1 | O2—Ni1—O4 | 92.46 (14) |
C2—C3—H3 | 120.1 | O1—Ni1—O4 | 85.14 (14) |
F1—C4—C3 | 118.9 (5) | O3i—Ni1—O5 | 85.59 (15) |
F1—C4—C5 | 118.9 (5) | O2i—Ni1—O5 | 94.66 (15) |
C3—C4—C5 | 122.2 (4) | O2—Ni1—O5 | 93.79 (13) |
C4—C5—C6 | 119.2 (5) | O1—Ni1—O5 | 90.19 (15) |
C4—C5—H5 | 120.4 | O4—Ni1—O5 | 172.19 (15) |
C6—C5—H5 | 120.4 | C1—O1—Ni1 | 123.0 (3) |
C5—C6—C7 | 121.3 (4) | C7—O2—Ni1i | 128.1 (3) |
C5—C6—C8 | 114.5 (4) | C7—O2—Ni1 | 128.3 (3) |
C7—C6—C8 | 124.1 (4) | Ni1i—O2—Ni1 | 99.82 (13) |
O2—C7—C2 | 121.1 (4) | C8—O3—Ni1i | 126.6 (3) |
O2—C7—C6 | 121.5 (4) | Ni1—O4—H4A | 110 (4) |
C2—C7—C6 | 117.4 (4) | Ni1—O4—H4B | 109 (4) |
O3—C8—C6 | 127.3 (4) | H4A—O4—H4B | 114 (6) |
O3—C8—H8 | 116.4 | Ni1—O5—H5C | 116 (4) |
C6—C8—H8 | 116.4 | Ni1—O5—H5A | 108 (4) |
O3i—Ni1—O2i | 89.45 (13) | H5C—O5—H5A | 111 (6) |
O1—C1—C2—C3 | 174.3 (5) | O3i—Ni1—O1—C1 | 161.0 (4) |
O1—C1—C2—C7 | −11.6 (8) | O2i—Ni1—O1—C1 | 3.4 (9) |
C1—C2—C3—C4 | 178.2 (5) | O2—Ni1—O1—C1 | −19.6 (4) |
C7—C2—C3—C4 | 3.7 (7) | O4—Ni1—O1—C1 | 72.9 (4) |
C2—C3—C4—F1 | 178.3 (4) | O5—Ni1—O1—C1 | −113.4 (4) |
C2—C3—C4—C5 | −2.4 (8) | C2—C7—O2—Ni1i | −166.2 (3) |
F1—C4—C5—C6 | 180.0 (5) | C6—C7—O2—Ni1i | 16.8 (6) |
C3—C4—C5—C6 | 0.7 (8) | C2—C7—O2—Ni1 | −12.6 (5) |
C4—C5—C6—C7 | −0.3 (8) | C6—C7—O2—Ni1 | 170.5 (3) |
C4—C5—C6—C8 | 179.7 (5) | O3i—Ni1—O2—C7 | −167.1 (7) |
C3—C2—C7—O2 | 179.7 (4) | O2i—Ni1—O2—C7 | −159.3 (4) |
C1—C2—C7—O2 | 5.8 (7) | O1—Ni1—O2—C7 | 16.5 (3) |
C3—C2—C7—C6 | −3.3 (6) | O4—Ni1—O2—C7 | −68.7 (3) |
C1—C2—C7—C6 | −177.1 (4) | O5—Ni1—O2—C7 | 106.7 (3) |
C5—C6—C7—O2 | 178.6 (4) | O3i—Ni1—O2—Ni1i | −7.8 (8) |
C8—C6—C7—O2 | −1.4 (7) | O2i—Ni1—O2—Ni1i | 0.0 |
C5—C6—C7—C2 | 1.6 (6) | O1—Ni1—O2—Ni1i | 175.74 (14) |
C8—C6—C7—C2 | −178.4 (4) | O4—Ni1—O2—Ni1i | 90.61 (15) |
C5—C6—C8—O3 | 173.9 (5) | O5—Ni1—O2—Ni1i | −94.08 (16) |
C7—C6—C8—O3 | −6.1 (8) | C6—C8—O3—Ni1i | −2.9 (7) |
C2—C1—O1—Ni1 | 21.3 (7) |
Symmetry code: (i) −x+1, −y+1, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
O4—H4A···Cl1 | 0.85 (5) | 2.44 (3) | 3.198 (4) | 149 (6) |
O4—H4B···Cl1ii | 0.85 (5) | 2.45 (3) | 3.241 (4) | 154 (5) |
O5—H5C···Cl1iii | 0.85 (2) | 2.61 (4) | 3.313 (4) | 141 (5) |
O5—H5A···Cl1i | 0.86 (6) | 2.39 (4) | 3.101 (4) | 142 (5) |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x, −y+1, −z+1; (iii) −x+1, y−1/2, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | [Ni2(C8H4FO3)2(H2O)4]Cl2 |
Mr | 594.61 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 291 |
a, b, c (Å) | 8.3299 (14), 13.576 (2), 9.9965 (17) |
β (°) | 114.623 (3) |
V (Å3) | 1027.6 (3) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 2.16 |
Crystal size (mm) | 0.26 × 0.22 × 0.20 |
Data collection | |
Diffractometer | Bruker SMART APEX CCD |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.603, 0.672 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 5827, 2018, 1708 |
Rint | 0.041 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.051, 0.119, 1.05 |
No. of reflections | 2018 |
No. of parameters | 157 |
No. of restraints | 4 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.42, −0.94 |
Computer programs: SMART (Bruker, 2007), SAINT (Bruker, 2007), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
O4—H4A···Cl1 | 0.85 (5) | 2.44 (3) | 3.198 (4) | 149 (6) |
O4—H4B···Cl1i | 0.85 (5) | 2.45 (3) | 3.241 (4) | 154 (5) |
O5—H5C···Cl1ii | 0.85 (2) | 2.61 (4) | 3.313 (4) | 141 (5) |
O5—H5A···Cl1iii | 0.86 (6) | 2.39 (4) | 3.101 (4) | 142 (5) |
Symmetry codes: (i) −x, −y+1, −z+1; (ii) −x+1, y−1/2, −z+3/2; (iii) −x+1, −y+1, −z+1. |
Acknowledgements
The authors would like to thank the National Science Foundation of China for financial support (No. 20871097).
References
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Phenoxide-bridged dinuclear complexes have been extensively studied for several decades, most of them were derived from the cyclocondensation of 2,6-diformyl-4-R-phenol and alkyldiamine in the presence of metal ions (Thompson et al.,1996; Zhou et al., 2005; Raimondi et al., 2004).With short distances between the two metal ions in the complexes, they show special electrical and magnetic properties (Mohanta et al., 1998; Wang et al., 1997). Adhikary et al. reported a phenoxide-bridged dinuclear nickel(II) complex, obtained directly from the mixture of 2,6-diformyl-4-methyl-phenol and nickel(II) perchlorate (Adhikary et al., 1987). Here we report the crystal structure of a new dinuclear NiII complex with fluorine substituent in the phenyl ring. The diference between the title complex and the one Adhikary reported is that they have different substituents in the phenyl ring and different counter-anions.
The coordination cation consists of two 2,6-diformyl-4-flurophenolate ligands, four water molecules, two NiII ions (Fig. 1). The chlorine ions do not participate in coordination to the Ni atoms. Each Ni atom has a slightly distorted octahedral coordination geometry and it deviates from the equatorial plane defined by four coordinating oxygen atoms of the organic ligand by 0.0266 (4) Å. The axial positions are occupied by two water molecules with Ni–O distances of 2.057 (4) Å and 2.067 (4) Å.The Ni—O distance in the basal plane is in the range of 1.995 (4) Å - 2.019 (3) Å. The presence of the two bridging phenolate O atoms gives rise to a short metal-metal contact of 3.0751 (9) Å that is slightly longer than those of binuclear nickel(II) complexes with macrocyclic phenoxo-bridging ligands (Zhou et al., 2007).