Acta Cryst. (2009). E65, o1467 [ doi:10.1107/S1600536809020480 ]
In the crystal structure of the title cocrystal, 2C7H7NO·C4H4O4, the complete fumaric acid molecule is generated by a crystallographic inversion centre. The two components of the cocrystal are linked by an O-H
N hydrogen bond.
Reagents and solvent were used as purchased without further purification. 4-Acetylpyridine (2 mmol) and fumaric acid (1 mmol) were dissolved in water–ethanol (6 ml, 1:5) at room temperature. The single crystals were obtained from the solution after 3 d.
The carboxyl H atom was located in a difference Fourier map and refined isotropically. Methyl H atoms were placed in calculated positions with C—H = 0.96 Å and the torsion angle was refined to fit the electron density, Uiso(H) = 1.5Ueq(C). Other H atoms were placed in calculated positions with C—H = 0.93 Å and refined in riding mode with Uiso(H) = 1.2Ueq(C).
Data collection: PROCESS-AUTO (Rigaku, 1998); cell refinement: PROCESS-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
![[Figure 1]](./ng2588fig1thm.gif)
| Fig. 1. The molecular structure of the title compound with 40% probability displacement (arbitrary spheres for H atoms). Dashed lines indicate hydrogen bonding. |
| 2C7H7NO·C4H4O4 | Z = 1 |
| Mr = 358.34 | F(000) = 188 |
| Triclinic, P1 | Dx = 1.351 Mg m−3 |
| Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
| a = 3.9062 (5) Å | Cell parameters from 2308 reflections |
| b = 8.6809 (13) Å | θ = 3.2–24.6° |
| c = 13.0909 (18) Å | µ = 0.10 mm−1 |
| α = 87.925 (4)° | T = 294 K |
| β = 89.941 (3)° | Needle, colourless |
| γ = 83.141 (4)° | 0.30 × 0.11 × 0.08 mm |
| V = 440.44 (11) Å3 |
| Rigaku R-AXIS RAPID IP diffractometer | 798 reflections with I > 2σ(I) |
| Radiation source: fine-focus sealed tube | Rint = 0.030 |
| graphite | θmax = 25.2°, θmin = 3.1° |
| ω scans | h = −4→4 |
| 3600 measured reflections | k = −10→10 |
| 1589 independent reflections | l = −15→15 |
| Refinement on F2 | Secondary atom site location: difference Fourier map |
| Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
| R[F2 > 2σ(F2)] = 0.040 | H atoms treated by a mixture of independent and constrained refinement |
| wR(F2) = 0.143 | w = 1/[σ2(Fo2) + (0.0527P)2 + 0.048P] where P = (Fo2 + 2Fc2)/3 |
| S = 1.18 | (Δ/σ)max = 0.001 |
| 1589 reflections | Δρmax = 0.19 e Å−3 |
| 124 parameters | Δρmin = −0.20 e Å−3 |
| 0 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
| Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.032 (8) |
| 2C7H7NO·C4H4O4 | γ = 83.141 (4)° |
| Mr = 358.34 | V = 440.44 (11) Å3 |
| Triclinic, P1 | Z = 1 |
| a = 3.9062 (5) Å | Mo Kα radiation |
| b = 8.6809 (13) Å | µ = 0.10 mm−1 |
| c = 13.0909 (18) Å | T = 294 K |
| α = 87.925 (4)° | 0.30 × 0.11 × 0.08 mm |
| β = 89.941 (3)° |
| Rigaku R-AXIS RAPID IP diffractometer | 798 reflections with I > 2σ(I) |
| 3600 measured reflections | Rint = 0.030 |
| 1589 independent reflections | θmax = 25.2° |
| R[F2 > 2σ(F2)] = 0.040 | H atoms treated by a mixture of independent and constrained refinement |
| wR(F2) = 0.143 | Δρmax = 0.19 e Å−3 |
| S = 1.18 | Δρmin = −0.20 e Å−3 |
| 1589 reflections | Absolute structure: ? |
| 124 parameters | Flack parameter: ? |
| 0 restraints | Rogers parameter: ? |
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 | ||
| N1 | 0.4491 (6) | 0.4588 (3) | 0.69775 (18) | 0.0630 (7) | |
| O1 | 0.8832 (6) | 0.7499 (3) | 0.98158 (16) | 0.0900 (8) | |
| O2 | 0.1660 (6) | 0.1037 (2) | 0.67034 (15) | 0.0775 (7) | |
| O3 | 0.2584 (6) | 0.2870 (3) | 0.55473 (16) | 0.0764 (7) | |
| C1 | 0.5832 (8) | 0.4178 (4) | 0.7899 (2) | 0.0733 (9) | |
| H1 | 0.6122 | 0.3130 | 0.8097 | 0.088* | |
| C2 | 0.6807 (7) | 0.5230 (3) | 0.8573 (2) | 0.0651 (9) | |
| H2 | 0.7765 | 0.4894 | 0.9204 | 0.078* | |
| C3 | 0.6342 (6) | 0.6786 (3) | 0.82954 (19) | 0.0494 (7) | |
| C4 | 0.4891 (6) | 0.7228 (3) | 0.73526 (19) | 0.0546 (7) | |
| H4 | 0.4508 | 0.8270 | 0.7145 | 0.065* | |
| C5 | 0.4019 (7) | 0.6088 (4) | 0.6724 (2) | 0.0612 (8) | |
| H5 | 0.3048 | 0.6391 | 0.6089 | 0.073* | |
| C6 | 0.7453 (7) | 0.7954 (3) | 0.9018 (2) | 0.0562 (8) | |
| C7 | 0.6902 (7) | 0.9624 (3) | 0.8712 (2) | 0.0653 (9) | |
| H7A | 0.7914 | 1.0212 | 0.9215 | 0.098* | |
| H7B | 0.4474 | 0.9961 | 0.8664 | 0.098* | |
| H7C | 0.7961 | 0.9784 | 0.8061 | 0.098* | |
| C8 | 0.1658 (7) | 0.1535 (3) | 0.5833 (2) | 0.0539 (7) | |
| C9 | 0.0643 (7) | 0.0651 (3) | 0.4951 (2) | 0.0561 (8) | |
| H9 | 0.0951 | 0.1057 | 0.4295 | 0.067* | |
| H3A | 0.335 (9) | 0.337 (5) | 0.615 (3) | 0.131 (14)* |
| U11 | U22 | U33 | U12 | U13 | U23 | |
| N1 | 0.0771 (16) | 0.0500 (17) | 0.0641 (16) | −0.0142 (12) | −0.0009 (13) | −0.0083 (13) |
| O1 | 0.1244 (18) | 0.0731 (17) | 0.0703 (14) | −0.0004 (13) | −0.0407 (14) | −0.0077 (12) |
| O2 | 0.1167 (18) | 0.0640 (15) | 0.0548 (13) | −0.0234 (12) | −0.0138 (12) | 0.0004 (11) |
| O3 | 0.1198 (18) | 0.0541 (15) | 0.0607 (13) | −0.0313 (13) | −0.0048 (12) | −0.0076 (11) |
| C1 | 0.096 (2) | 0.046 (2) | 0.077 (2) | −0.0096 (17) | −0.0064 (19) | 0.0019 (17) |
| C2 | 0.082 (2) | 0.052 (2) | 0.0610 (19) | −0.0053 (15) | −0.0123 (16) | 0.0030 (15) |
| C3 | 0.0523 (15) | 0.0448 (18) | 0.0513 (16) | −0.0058 (12) | −0.0004 (13) | −0.0030 (13) |
| C4 | 0.0682 (17) | 0.0451 (17) | 0.0512 (16) | −0.0100 (13) | −0.0046 (14) | −0.0014 (13) |
| C5 | 0.0704 (18) | 0.057 (2) | 0.0566 (18) | −0.0100 (15) | −0.0086 (15) | −0.0024 (15) |
| C6 | 0.0577 (16) | 0.057 (2) | 0.0541 (18) | −0.0048 (13) | −0.0047 (14) | −0.0051 (14) |
| C7 | 0.0738 (19) | 0.054 (2) | 0.070 (2) | −0.0163 (15) | −0.0083 (16) | −0.0077 (16) |
| C8 | 0.0604 (16) | 0.0446 (18) | 0.0567 (18) | −0.0048 (13) | −0.0084 (14) | −0.0063 (14) |
| C9 | 0.0680 (17) | 0.0469 (18) | 0.0534 (16) | −0.0063 (13) | −0.0072 (14) | −0.0016 (14) |
| N1—C5 | 1.323 (4) | C3—C6 | 1.512 (4) |
| N1—C1 | 1.335 (4) | C4—C5 | 1.383 (4) |
| O1—C6 | 1.207 (3) | C4—H4 | 0.9300 |
| O2—C8 | 1.204 (3) | C5—H5 | 0.9300 |
| O3—C8 | 1.297 (3) | C6—C7 | 1.481 (4) |
| O3—H3A | 0.97 (4) | C7—H7A | 0.9600 |
| C1—C2 | 1.378 (4) | C7—H7B | 0.9600 |
| C1—H1 | 0.9300 | C7—H7C | 0.9600 |
| C2—C3 | 1.377 (4) | C8—C9 | 1.488 (4) |
| C2—H2 | 0.9300 | C9—C9i | 1.293 (5) |
| C3—C4 | 1.381 (3) | C9—H9 | 0.9300 |
| C5—N1—C1 | 117.3 (3) | C4—C5—H5 | 118.2 |
| C8—O3—H3A | 108 (2) | O1—C6—C7 | 121.8 (3) |
| N1—C1—C2 | 123.2 (3) | O1—C6—C3 | 119.3 (3) |
| N1—C1—H1 | 118.4 | C7—C6—C3 | 118.9 (2) |
| C2—C1—H1 | 118.4 | C6—C7—H7A | 109.5 |
| C3—C2—C1 | 118.9 (3) | C6—C7—H7B | 109.5 |
| C3—C2—H2 | 120.5 | H7A—C7—H7B | 109.5 |
| C1—C2—H2 | 120.5 | C6—C7—H7C | 109.5 |
| C2—C3—C4 | 118.4 (2) | H7A—C7—H7C | 109.5 |
| C2—C3—C6 | 119.6 (2) | H7B—C7—H7C | 109.5 |
| C4—C3—C6 | 122.0 (3) | O2—C8—O3 | 124.8 (3) |
| C3—C4—C5 | 118.6 (3) | O2—C8—C9 | 123.1 (3) |
| C3—C4—H4 | 120.7 | O3—C8—C9 | 112.2 (3) |
| C5—C4—H4 | 120.7 | C9i—C9—C8 | 123.6 (3) |
| N1—C5—C4 | 123.5 (3) | C9i—C9—H9 | 118.2 |
| N1—C5—H5 | 118.2 | C8—C9—H9 | 118.2 |
| Symmetry codes: (i) −x, −y, −z+1. |
| D—H···A | D—H | H···A | D···A | D—H···A |
| O3—H3A···N1 | 0.98 (4) | 1.64 (4) | 2.599 (3) | 166 (4) |
| C4—H4···O2ii | 0.93 | 2.57 | 3.471 (3) | 164 |
| C7—H7C···O2iii | 0.96 | 2.58 | 3.489 (3) | 158 |
| Symmetry codes: (ii) x, y+1, z; (iii) x+1, y+1, z. |
| D—H···A | D—H | H···A | D···A | D—H···A |
| O3—H3A···N1 | 0.98 (4) | 1.64 (4) | 2.599 (3) | 166 (4) |
The work was supported by the Scientific Foundation of the Department of Education of Zhejiang Province, China (grant No. Y200700867).
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The fumaric acid and acetylpyridine have been widely used in the biological and medicine fileds (Thomas et al. 2007; Fidler et al. 2003). In the medicine composition the carboxyl group of the fumaric acid is usually deprotonated while the pyridine derivatives are protonated. But some crystal structure determinations showed the neutral pyridine derivatives and fumaric acid in the crystal structures, i.e. the pyridine derivatives are not protonated while the fumaric acid is also not deprotonated in these crystal structures (Bowes et al. 2003; Aakeroy et al., 2002, 2006, 2007; Haynes et al. 2006; Bu et al. 2007). Herein we report the crystal structure of the new compound containing pyridine derivative and fumaric acid components.
The crystal structure of the title compond consists of fumaric acid and 4-acetylpyridine molecules (Fig. 1). The planar fumaric acid molecule is centrosymmetric with the mid-point of the C═C double bond located at an inversion center. The C8—O2 bond distance of 1.204 (3) Å is much shorter than the C8—O3 bond distance of 1.297 (3) Å, it suggests that the carboxyl group is not deprotonated in the crystal structure (Liu et al. 2003).
The acetylpyridine molecule is not protonated in the crystal structure, which contrasts with that found in the crystal structure of the 4-acetylpyridinium chloride (Kochel, 2005). The geometry data of the acetylpyridine is consistent with those found in metal complexes of acetylpyridine (Steffen & Palenik, 1977; Pang et al., 1994). The planar acetylpyridine molecule is twisted to the fumaric acid with a dihedral angle of 25.97 (11)° in the crystal structure.
The intermolecular classic O—H···N hydrogen bonding and weak C—H···O hydrogen bonding help to stabilize the crystal structure (Table 1).