organic compounds
3,3′-Dimethyl-1,1′-[(1,3-dihydroxypropane-2,2-diyl)dimethylidene]diimidazolium bis(hexafluorophosphate)
aDepartment of Light Chemical Engineering, College of Food Science and Light Industry, Nanjing University of Technology, Nanjing 210009, People's Republic of China, and bDepartment of Applied Chemistry, College of Science, Nanjing University of Technology, Nanjing 210009, People's Republic of China
*Correspondence e-mail: kingwell2004@sina.com.cn
The title compound, C13H22N4O22+·2PF6−, was prepared by the of the dibromide ionic liquid with potassium hexafluorophosphate. The two imidazole rings are each planar (r.m.s. deviations = 0.0016 and 0.0060 Å) and make a dihedral angle of 45.3 (18)°. Intramolecular O—H⋯F hydrogen bonds occur. Intermolecular C—H⋯F, O—H⋯O and C—H⋯O hydrogen bonds stabilize the crystal structure.
Related literature
For properties and applications of ionic liquids, see: Welton (1999). For dicationic ionic liquids, see: Liang et al. (2008); Geng et al. (2010). For the synthesis of the title compound, see: Cai et al. (2007); Cai & Liu, (2009). For bond-length data, see: Allen et al., (1987).
Experimental
Crystal data
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Data collection: CAD-4 (Enraf–Nonius, 1989); cell CAD-4; data reduction: XCAD4 (Harms & Wocadlo, 1995); 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
https://doi.org/10.1107/S1600536810047677/rk2245sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810047677/rk2245Isup2.hkl
A mixture of 1-methylimidazole (2.05 g, 25 mmol) and 2,2-bis(bromomethyl)-propane-1,3-diol (2.60 g, 10 mmol) were stirred vigorously at 423 K for 8 h. After cooling to room temperature, the crude product was washed with acetonitrile. The resulting solid collected by filtration was treated with water (20 ml) as well as KPF6 (3.68 g, 20 mmol) and the reaction mixture was stirred at room temperature for 1 h. After filtration, the white solid was washed with ethanol and dried in vacuo to give the title compound I (5.02 g, 91%)(Cai et al., 2007; Cai & Liu, 2009). M.p. 497–500 K. Crystals of I suitable for X-ray diffraction study were obtained by slow evaporation of methanol solution. 1H NMR (DMSO, δ, p.p.m.) 8.96 (s, 2 H), 7.72 (d, 2 H), 7.60 (d, 2 H), 5.29 (s, 2 H) 4.24 (s, 4 H), 3.87 (s, 6 H), 3.12 (s, 4 H).
In the both hexafluorophosphate groups, fluorine atoms have strong oscillations, while central P atoms are fixed. All H atoms were positioned geometrically, with C—H = 0.93Å, 0.96Å and 0.97Å for aromatic, methyl, methylene H, respectively. H atoms of hydroxy-groups were positioned geometrically too with O—H = 0.82Å. During
these H atoms were constrained to ride on their parent atoms, with Uiso(H) = xUeq(C, O), where x = 1.2 for aromatic and methylene H atoms and x = 1.5 for methyl and hydroxyl H atoms.Ionic liquids (ILs) have enjoyed considerable research interests in recent years because of their unique properties (Welton, 1999). Geminal dicationic ILs have been shown to possess superior physical properties in terms of thermal stability and volatility compared to traditional ILs (Liang et al., 2008).
As part of our ongoing studies on new Geminal dicationic ILs (Geng et al., 2010), we here report the
of the title compound I.The atom-numbering scheme of I is shown in Fig. 1. There are exist intramolecular C—H···O and O—H···F hydrogen bonds, while intermolecular C—H···F, O—H···O and C—H···O hydrogen bonds stablize the
All bond lengths are within normal ranges (Allen et al., 1987). The imidazole ring is planar, with r.m.s. deviation 0.0016Å. The dihedral angles between two imidazole ring is 45.3 (18)°. There exist intermolecular C—H···F hydrogen bonds between hexafluorophosphate anions and imidazolium cations (Table 1, Fig. 1 and Fig. 2).For properties and applications of ionic liquids, see: Welton (1999). For dicationic ionic liquids, see: Liang et al. (2008); Geng et al. (2010). For the synthesis of the title compound, see: Cai et al. (2007); Cai & Liu, (2009). For bond-length data, see: Allen et al., (1987).
Data collection: CAD-4 (Enraf–Nonius, 1989); cell
CAD-4 (Enraf–Nonius, 1989); data reduction: XCAD4 (Harms & Wocadlo, 1995); 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).C13H22N4O22+·2PF6− | Dx = 1.661 Mg m−3 |
Mr = 556.29 | Melting point = 497–500 K |
Orthorhombic, Pna21 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2c -2n | Cell parameters from 25 reflections |
a = 14.622 (3) Å | θ = 9–13° |
b = 12.504 (3) Å | µ = 0.31 mm−1 |
c = 12.165 (2) Å | T = 295 K |
V = 2224.2 (8) Å3 | Block, colourless |
Z = 4 | 0.20 × 0.10 × 0.10 mm |
F(000) = 1128 |
Enraf–Nonius CAD-4 diffractometer | 1861 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.067 |
Graphite monochromator | θmax = 25.4°, θmin = 2.1° |
ω/2θ–scans | h = 0→17 |
Absorption correction: ψ scan (North et al., 1968) | k = 0→15 |
Tmin = 0.940, Tmax = 0.969 | l = −14→14 |
4082 measured reflections | 3 standard reflections every 200 reflections |
2152 independent reflections | intensity decay: 1% |
Refinement on F2 | Hydrogen site location: inferred from neighbouring sites |
Least-squares matrix: full | H-atom parameters constrained |
R[F2 > 2σ(F2)] = 0.066 | w = 1/[σ2(Fo2) + (0.034P)2] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.123 | (Δ/σ)max < 0.001 |
S = 1.00 | Δρmax = 0.20 e Å−3 |
4082 reflections | Δρmin = −0.17 e Å−3 |
298 parameters | Extinction correction: SHELXL97 (Sheldrick, 2008) |
1 restraint | Extinction coefficient: 0.105 (11) |
Primary atom site location: structure-invariant direct methods | Absolute structure: Flack (1983), 1930 Friedel pairs |
Secondary atom site location: difference Fourier map | Absolute structure parameter: 0.01 (16) |
C13H22N4O22+·2PF6− | V = 2224.2 (8) Å3 |
Mr = 556.29 | Z = 4 |
Orthorhombic, Pna21 | Mo Kα radiation |
a = 14.622 (3) Å | µ = 0.31 mm−1 |
b = 12.504 (3) Å | T = 295 K |
c = 12.165 (2) Å | 0.20 × 0.10 × 0.10 mm |
Enraf–Nonius CAD-4 diffractometer | 1861 reflections with I > 2σ(I) |
Absorption correction: ψ scan (North et al., 1968) | Rint = 0.067 |
Tmin = 0.940, Tmax = 0.969 | 3 standard reflections every 200 reflections |
4082 measured reflections | intensity decay: 1% |
2152 independent reflections |
R[F2 > 2σ(F2)] = 0.066 | H-atom parameters constrained |
wR(F2) = 0.123 | Δρmax = 0.20 e Å−3 |
S = 1.00 | Δρmin = −0.17 e Å−3 |
4082 reflections | Absolute structure: Flack (1983), 1930 Friedel pairs |
298 parameters | Absolute structure parameter: 0.01 (16) |
1 restraint |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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 | ||
O1 | 0.8641 (3) | 0.5204 (5) | 0.2865 (3) | 0.119 (2) | |
H1A | 0.8104 | 0.5362 | 0.2756 | 0.179* | |
N1 | 1.0848 (6) | 0.8302 (5) | 0.4610 (6) | 0.103 (2) | |
C1 | 1.1347 (5) | 0.9027 (6) | 0.5270 (7) | 0.123 (3) | |
H1B | 1.1127 | 0.9740 | 0.5144 | 0.185* | |
H1C | 1.1983 | 0.8989 | 0.5082 | 0.185* | |
H1D | 1.1268 | 0.8845 | 0.6030 | 0.185* | |
O2 | 1.0931 (3) | 0.4708 (3) | 0.5634 (3) | 0.0826 (14) | |
H2A | 1.1025 | 0.4740 | 0.6298 | 0.124* | |
N2 | 1.0515 (4) | 0.6773 (4) | 0.3942 (5) | 0.0724 (16) | |
C2 | 1.1092 (6) | 0.7153 (6) | 0.4672 (6) | 0.092 (3) | |
H2B | 1.1525 | 0.6804 | 0.5101 | 0.111* | |
N3 | 0.9585 (3) | 0.2977 (4) | 0.4254 (4) | 0.0595 (13) | |
C3 | 1.0013 (6) | 0.7562 (7) | 0.3474 (7) | 0.101 (2) | |
H3A | 0.9577 | 0.7467 | 0.2927 | 0.121* | |
N4 | 0.8598 (4) | 0.1738 (4) | 0.4570 (4) | 0.0708 (15) | |
C4 | 1.0258 (6) | 0.8556 (7) | 0.3952 (8) | 0.098 (3) | |
H4A | 1.0027 | 0.9233 | 0.3801 | 0.117* | |
C5 | 1.0500 (4) | 0.5689 (4) | 0.3557 (5) | 0.0593 (15) | |
H5A | 1.1108 | 0.5385 | 0.3631 | 0.071* | |
H5B | 1.0342 | 0.5684 | 0.2783 | 0.071* | |
C6 | 0.9823 (3) | 0.4998 (4) | 0.4183 (4) | 0.0402 (12) | |
C7 | 1.0003 (4) | 0.4992 (5) | 0.5411 (4) | 0.0649 (16) | |
H7A | 0.9877 | 0.5695 | 0.5712 | 0.078* | |
H7B | 0.9598 | 0.4484 | 0.5765 | 0.078* | |
C8 | 0.8832 (3) | 0.5271 (5) | 0.3995 (4) | 0.0580 (15) | |
H8A | 0.8445 | 0.4778 | 0.4398 | 0.070* | |
H8B | 0.8709 | 0.5990 | 0.4257 | 0.070* | |
C9 | 1.0043 (4) | 0.3873 (4) | 0.3704 (5) | 0.0637 (15) | |
H9A | 0.9872 | 0.3866 | 0.2934 | 0.076* | |
H9B | 1.0698 | 0.3760 | 0.3744 | 0.076* | |
C10 | 0.9922 (5) | 0.2325 (5) | 0.5067 (5) | 0.0652 (19) | |
H10A | 1.0493 | 0.2387 | 0.5397 | 0.078* | |
C11 | 0.9291 (5) | 0.1587 (6) | 0.5303 (6) | 0.081 (2) | |
H11A | 0.9320 | 0.1074 | 0.5855 | 0.098* | |
C12 | 0.8786 (4) | 0.2570 (4) | 0.3921 (5) | 0.0599 (16) | |
H12A | 0.8428 | 0.2821 | 0.3344 | 0.072* | |
C13 | 0.7815 (5) | 0.1020 (6) | 0.4552 (6) | 0.109 (3) | |
H13A | 0.7397 | 0.1243 | 0.3988 | 0.164* | |
H13B | 0.7513 | 0.1040 | 0.5252 | 0.164* | |
H13C | 0.8019 | 0.0305 | 0.4404 | 0.164* | |
P1 | 0.72571 (13) | 0.35606 (18) | 0.68464 (19) | 0.0911 (6) | |
F1 | 0.7669 (3) | 0.4744 (3) | 0.6875 (5) | 0.1535 (18) | |
F2 | 0.6868 (3) | 0.2424 (3) | 0.6720 (5) | 0.1459 (18) | |
F3 | 0.6246 (3) | 0.4001 (4) | 0.6840 (4) | 0.1420 (16) | |
F4 | 0.7290 (3) | 0.3498 (5) | 0.8136 (3) | 0.151 (2) | |
F5 | 0.7254 (4) | 0.3651 (4) | 0.5546 (4) | 0.140 (2) | |
F6 | 0.8266 (2) | 0.3132 (4) | 0.6825 (5) | 0.1478 (18) | |
P2 | 0.64385 (14) | 0.33975 (18) | 0.1878 (2) | 0.0992 (7) | |
F7 | 0.7457 (4) | 0.3277 (4) | 0.1659 (6) | 0.179 (2) | |
F8 | 0.6282 (7) | 0.3840 (8) | 0.0811 (7) | 0.355 (7) | |
F9 | 0.6598 (5) | 0.3032 (5) | 0.3039 (4) | 0.220 (3) | |
F10 | 0.6708 (5) | 0.4574 (5) | 0.2350 (7) | 0.238 (4) | |
F11 | 0.6079 (10) | 0.2399 (7) | 0.1625 (8) | 0.390 (8) | |
F12 | 0.5486 (5) | 0.3672 (9) | 0.2204 (9) | 0.314 (6) |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.069 (3) | 0.240 (6) | 0.049 (2) | 0.047 (4) | 0.006 (2) | 0.014 (3) |
N1 | 0.109 (6) | 0.068 (5) | 0.131 (6) | −0.036 (5) | 0.018 (5) | −0.028 (4) |
C1 | 0.117 (7) | 0.105 (6) | 0.147 (8) | −0.006 (6) | 0.008 (7) | 0.006 (6) |
O2 | 0.054 (3) | 0.125 (4) | 0.069 (3) | 0.022 (3) | −0.011 (2) | −0.016 (3) |
N2 | 0.065 (4) | 0.067 (4) | 0.086 (4) | −0.006 (3) | 0.021 (3) | −0.005 (3) |
C2 | 0.090 (6) | 0.085 (6) | 0.102 (6) | −0.023 (5) | 0.021 (5) | −0.031 (5) |
N3 | 0.063 (3) | 0.050 (3) | 0.066 (3) | −0.011 (3) | −0.019 (3) | −0.010 (3) |
C3 | 0.085 (6) | 0.110 (6) | 0.108 (6) | −0.009 (6) | 0.028 (5) | −0.005 (6) |
N4 | 0.061 (3) | 0.087 (4) | 0.065 (3) | −0.029 (3) | −0.006 (3) | 0.009 (3) |
C4 | 0.077 (6) | 0.100 (7) | 0.116 (8) | 0.008 (5) | 0.038 (5) | 0.012 (6) |
C5 | 0.053 (3) | 0.053 (3) | 0.071 (4) | 0.004 (3) | 0.009 (3) | 0.004 (3) |
C6 | 0.047 (3) | 0.036 (2) | 0.037 (3) | −0.012 (3) | −0.006 (3) | 0.005 (2) |
C7 | 0.061 (4) | 0.092 (4) | 0.042 (3) | 0.000 (3) | −0.003 (3) | −0.020 (3) |
C8 | 0.047 (3) | 0.087 (4) | 0.041 (3) | 0.021 (3) | 0.004 (3) | 0.015 (3) |
C9 | 0.068 (4) | 0.075 (4) | 0.048 (3) | −0.007 (4) | 0.005 (3) | −0.002 (3) |
C10 | 0.071 (5) | 0.052 (4) | 0.072 (5) | −0.003 (4) | −0.016 (4) | 0.005 (3) |
C11 | 0.087 (5) | 0.089 (5) | 0.069 (5) | 0.014 (5) | −0.003 (4) | 0.004 (4) |
C12 | 0.067 (4) | 0.025 (2) | 0.088 (4) | −0.004 (3) | −0.020 (4) | 0.001 (3) |
C13 | 0.077 (5) | 0.133 (7) | 0.118 (6) | −0.067 (5) | −0.007 (4) | −0.008 (5) |
P1 | 0.0748 (13) | 0.1251 (16) | 0.0734 (12) | −0.0271 (12) | −0.0068 (14) | −0.0219 (14) |
F1 | 0.166 (4) | 0.136 (3) | 0.159 (4) | −0.059 (3) | −0.010 (4) | −0.044 (4) |
F2 | 0.170 (4) | 0.120 (3) | 0.148 (4) | −0.072 (3) | −0.012 (4) | −0.026 (4) |
F3 | 0.077 (3) | 0.234 (5) | 0.116 (3) | −0.002 (3) | −0.004 (3) | 0.021 (4) |
F4 | 0.117 (4) | 0.264 (7) | 0.073 (3) | 0.014 (4) | 0.002 (3) | −0.007 (4) |
F5 | 0.135 (5) | 0.198 (6) | 0.087 (4) | −0.029 (4) | 0.016 (3) | 0.012 (3) |
F6 | 0.067 (3) | 0.206 (5) | 0.170 (4) | 0.001 (3) | −0.014 (4) | −0.073 (4) |
P2 | 0.0872 (16) | 0.1174 (17) | 0.0929 (15) | −0.0272 (13) | −0.0190 (16) | 0.0416 (15) |
F7 | 0.130 (5) | 0.235 (6) | 0.171 (5) | −0.026 (4) | 0.038 (5) | −0.041 (6) |
F8 | 0.375 (14) | 0.489 (14) | 0.201 (8) | −0.219 (11) | −0.182 (9) | 0.238 (9) |
F9 | 0.263 (8) | 0.293 (8) | 0.104 (5) | −0.080 (7) | −0.052 (5) | 0.083 (5) |
F10 | 0.206 (7) | 0.153 (5) | 0.355 (12) | −0.041 (5) | 0.034 (7) | 0.001 (7) |
F11 | 0.70 (2) | 0.233 (7) | 0.241 (9) | −0.308 (11) | 0.025 (13) | −0.029 (8) |
F12 | 0.111 (5) | 0.491 (15) | 0.340 (14) | 0.080 (7) | −0.002 (6) | 0.009 (12) |
O1—C8 | 1.406 (6) | C6—C7 | 1.518 (7) |
O1—H1A | 0.8200 | C6—C9 | 1.556 (8) |
N1—C4 | 1.219 (9) | C7—H7A | 0.9700 |
N1—C1 | 1.413 (9) | C7—H7B | 0.9700 |
N1—C2 | 1.482 (10) | C8—H8A | 0.9700 |
C1—H1B | 0.9600 | C8—H8B | 0.9700 |
C1—H1C | 0.9600 | C9—H9A | 0.9700 |
C1—H1D | 0.9600 | C9—H9B | 0.9700 |
O2—C7 | 1.428 (7) | C10—C11 | 1.336 (8) |
O2—H2A | 0.8200 | C10—H10A | 0.9300 |
N2—C2 | 1.314 (8) | C11—H11A | 0.9300 |
N2—C3 | 1.354 (9) | C12—H12A | 0.9300 |
N2—C5 | 1.434 (6) | C13—H13A | 0.9600 |
C2—H2B | 0.9300 | C13—H13B | 0.9600 |
N3—C12 | 1.338 (6) | C13—H13C | 0.9600 |
N3—C10 | 1.372 (7) | P1—F2 | 1.538 (4) |
N3—C9 | 1.467 (7) | P1—F6 | 1.570 (4) |
C3—C4 | 1.419 (11) | P1—F4 | 1.572 (4) |
C3—H3A | 0.9300 | P1—F3 | 1.578 (4) |
N4—C12 | 1.335 (7) | P1—F5 | 1.586 (5) |
N4—C11 | 1.363 (8) | P1—F1 | 1.598 (4) |
N4—C13 | 1.454 (7) | P2—F11 | 1.390 (6) |
C4—H4A | 0.9300 | P2—F8 | 1.429 (6) |
C5—C6 | 1.519 (6) | P2—F12 | 1.489 (7) |
C5—H5A | 0.9700 | P2—F9 | 1.503 (5) |
C5—H5B | 0.9700 | P2—F7 | 1.521 (6) |
C6—C8 | 1.506 (6) | P2—F10 | 1.628 (6) |
C8—O1—H1A | 109.5 | H8A—C8—H8B | 108.3 |
C4—N1—C1 | 124.8 (9) | N3—C9—C6 | 115.2 (4) |
C4—N1—C2 | 117.1 (8) | N3—C9—H9A | 108.5 |
C1—N1—C2 | 118.0 (8) | C6—C9—H9A | 108.5 |
N1—C1—H1B | 109.5 | N3—C9—H9B | 108.5 |
N1—C1—H1C | 109.5 | C6—C9—H9B | 108.5 |
H1B—C1—H1C | 109.5 | H9A—C9—H9B | 107.5 |
N1—C1—H1D | 109.5 | C11—C10—N3 | 108.5 (6) |
H1B—C1—H1D | 109.5 | C11—C10—H10A | 125.8 |
H1C—C1—H1D | 109.5 | N3—C10—H10A | 125.8 |
C7—O2—H2A | 109.5 | C10—C11—N4 | 106.1 (6) |
C2—N2—C3 | 111.6 (7) | C10—C11—H11A | 126.9 |
C2—N2—C5 | 124.9 (6) | N4—C11—H11A | 126.9 |
C3—N2—C5 | 122.9 (7) | N4—C12—N3 | 107.3 (5) |
N2—C2—N1 | 99.3 (7) | N4—C12—H12A | 126.4 |
N2—C2—H2B | 130.3 | N3—C12—H12A | 126.4 |
N1—C2—H2B | 130.3 | N4—C13—H13A | 109.5 |
C12—N3—C10 | 107.8 (5) | N4—C13—H13B | 109.5 |
C12—N3—C9 | 123.4 (5) | H13A—C13—H13B | 109.5 |
C10—N3—C9 | 128.2 (5) | N4—C13—H13C | 109.5 |
N2—C3—C4 | 109.2 (8) | H13A—C13—H13C | 109.5 |
N2—C3—H3A | 125.4 | H13B—C13—H13C | 109.5 |
C4—C3—H3A | 125.4 | F2—P1—F6 | 91.8 (3) |
C12—N4—C11 | 109.9 (6) | F2—P1—F4 | 93.7 (3) |
C12—N4—C13 | 129.4 (6) | F6—P1—F4 | 88.3 (3) |
C11—N4—C13 | 120.7 (6) | F2—P1—F3 | 88.6 (3) |
N1—C4—C3 | 102.7 (9) | F6—P1—F3 | 178.7 (4) |
N1—C4—H4A | 128.7 | F4—P1—F3 | 92.9 (3) |
C3—C4—H4A | 128.7 | F2—P1—F5 | 88.0 (3) |
N2—C5—C6 | 112.6 (4) | F6—P1—F5 | 90.6 (3) |
N2—C5—H5A | 109.1 | F4—P1—F5 | 178.0 (3) |
C6—C5—H5A | 109.1 | F3—P1—F5 | 88.1 (3) |
N2—C5—H5B | 109.1 | F2—P1—F1 | 175.5 (4) |
C6—C5—H5B | 109.1 | F6—P1—F1 | 87.8 (3) |
H5A—C5—H5B | 107.8 | F4—P1—F1 | 90.8 (3) |
C8—C6—C7 | 108.5 (4) | F3—P1—F1 | 91.7 (3) |
C8—C6—C5 | 114.9 (4) | F5—P1—F1 | 87.5 (3) |
C7—C6—C5 | 112.5 (4) | F11—P2—F8 | 95.0 (6) |
C8—C6—C9 | 110.3 (4) | F11—P2—F12 | 84.9 (6) |
C7—C6—C9 | 109.2 (4) | F8—P2—F12 | 90.2 (6) |
C5—C6—C9 | 101.1 (4) | F11—P2—F9 | 89.6 (5) |
O2—C7—C6 | 110.6 (4) | F8—P2—F9 | 174.9 (6) |
O2—C7—H7A | 109.5 | F12—P2—F9 | 88.0 (5) |
C6—C7—H7A | 109.5 | F11—P2—F7 | 104.1 (7) |
O2—C7—H7B | 109.5 | F8—P2—F7 | 92.1 (5) |
C6—C7—H7B | 109.5 | F12—P2—F7 | 170.5 (5) |
H7A—C7—H7B | 108.1 | F9—P2—F7 | 88.9 (4) |
O1—C8—C6 | 109.0 (4) | F11—P2—F10 | 169.1 (6) |
O1—C8—H8A | 109.9 | F8—P2—F10 | 90.5 (5) |
C6—C8—H8A | 109.9 | F12—P2—F10 | 85.6 (5) |
O1—C8—H8B | 109.9 | F9—P2—F10 | 84.6 (4) |
C6—C8—H8B | 109.9 | F7—P2—F10 | 85.1 (3) |
C3—N2—C2—N1 | 1.7 (7) | C7—C6—C8—O1 | −175.8 (5) |
C5—N2—C2—N1 | 173.0 (5) | C5—C6—C8—O1 | 57.2 (7) |
C4—N1—C2—N2 | −1.5 (9) | C9—C6—C8—O1 | −56.3 (6) |
C1—N1—C2—N2 | −178.1 (6) | C12—N3—C9—C6 | 93.2 (6) |
C2—N2—C3—C4 | −1.6 (9) | C10—N3—C9—C6 | −96.3 (7) |
C5—N2—C3—C4 | −173.1 (6) | C8—C6—C9—N3 | −66.1 (6) |
C1—N1—C4—C3 | 177.0 (7) | C7—C6—C9—N3 | 53.0 (6) |
C2—N1—C4—C3 | 0.6 (10) | C5—C6—C9—N3 | 171.8 (5) |
N2—C3—C4—N1 | 0.5 (9) | C12—N3—C10—C11 | −6.0 (7) |
C2—N2—C5—C6 | 95.0 (7) | C9—N3—C10—C11 | −177.7 (6) |
C3—N2—C5—C6 | −94.7 (7) | N3—C10—C11—N4 | 4.7 (8) |
N2—C5—C6—C8 | 68.1 (6) | C12—N4—C11—C10 | −1.8 (8) |
N2—C5—C6—C7 | −56.8 (6) | C13—N4—C11—C10 | 176.3 (6) |
N2—C5—C6—C9 | −173.2 (5) | C11—N4—C12—N3 | −1.8 (7) |
C8—C6—C7—O2 | 178.5 (5) | C13—N4—C12—N3 | −179.7 (6) |
C5—C6—C7—O2 | −53.2 (6) | C10—N3—C12—N4 | 4.7 (7) |
C9—C6—C7—O2 | 58.2 (6) | C9—N3—C12—N4 | 176.9 (5) |
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5B···O1 | 0.97 | 2.56 | 2.910 (7) | 101 |
C9—H9A···O1 | 0.97 | 2.46 | 2.831 (8) | 102 |
O1—H1A···F10 | 0.82 | 2.32 | 3.001 (8) | 141 |
O2—H2A···O1i | 0.82 | 1.97 | 2.787 (6) | 175 |
C2—H2B···F7i | 0.93 | 2.41 | 3.261 (11) | 152 |
C13—H13B···O2ii | 0.96 | 2.54 | 3.186 (7) | 125 |
Symmetry codes: (i) −x+2, −y+1, z+1/2; (ii) x−1/2, −y+1/2, z. |
Experimental details
Crystal data | |
Chemical formula | C13H22N4O22+·2PF6− |
Mr | 556.29 |
Crystal system, space group | Orthorhombic, Pna21 |
Temperature (K) | 295 |
a, b, c (Å) | 14.622 (3), 12.504 (3), 12.165 (2) |
V (Å3) | 2224.2 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.31 |
Crystal size (mm) | 0.20 × 0.10 × 0.10 |
Data collection | |
Diffractometer | Enraf–Nonius CAD-4 |
Absorption correction | ψ scan (North et al., 1968) |
Tmin, Tmax | 0.940, 0.969 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4082, 2152, 1861 |
Rint | 0.067 |
(sin θ/λ)max (Å−1) | 0.603 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.066, 0.123, 1.00 |
No. of reflections | 4082 |
No. of parameters | 298 |
No. of restraints | 1 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.20, −0.17 |
Absolute structure | Flack (1983), 1930 Friedel pairs |
Absolute structure parameter | 0.01 (16) |
Computer programs: CAD-4 (Enraf–Nonius, 1989), XCAD4 (Harms & Wocadlo, 1995), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5B···O1 | 0.97 | 2.56 | 2.910 (7) | 101.3 |
C9—H9A···O1 | 0.97 | 2.46 | 2.831 (8) | 102.4 |
O1—H1A···F10 | 0.82 | 2.32 | 3.001 (8) | 140.7 |
O2—H2A···O1i | 0.82 | 1.97 | 2.787 (6) | 175.2 |
C2—H2B···F7i | 0.93 | 2.41 | 3.261 (11) | 151.8 |
C13—H13B···O2ii | 0.96 | 2.54 | 3.186 (7) | 124.9 |
Symmetry codes: (i) −x+2, −y+1, z+1/2; (ii) x−1/2, −y+1/2, z. |
Acknowledgements
This work was supported by the Foundation for Young Teachers Scholarship of Nanjing University of Technology, Jiangsu, China (grant No. 39729005), The authors thank the Centre of Testing and Analysis, Nanjing University, for the data collection.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Ionic liquids (ILs) have enjoyed considerable research interests in recent years because of their unique properties (Welton, 1999). Geminal dicationic ILs have been shown to possess superior physical properties in terms of thermal stability and volatility compared to traditional ILs (Liang et al., 2008).
As part of our ongoing studies on new Geminal dicationic ILs (Geng et al., 2010), we here report the crystal structure of the title compound I.
The atom-numbering scheme of I is shown in Fig. 1. There are exist intramolecular C—H···O and O—H···F hydrogen bonds, while intermolecular C—H···F, O—H···O and C—H···O hydrogen bonds stablize the crystal structure. All bond lengths are within normal ranges (Allen et al., 1987). The imidazole ring is planar, with r.m.s. deviation 0.0016Å. The dihedral angles between two imidazole ring is 45.3 (18)°. There exist intermolecular C—H···F hydrogen bonds between hexafluorophosphate anions and imidazolium cations (Table 1, Fig. 1 and Fig. 2).