organic compounds
5,7-Dimethoxy-2-(4-methoxyphenyl)-4H-1-benzopyran-4-one methanol solvate monohydrate
aDepartment of Chemistry, Faculty of Science, Chulalongkorn University, Phyathai Road, Pathumwan, Bangkok 10330, Thailand, and bThe Center for Petroleum, Petrochemicals, and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand
*Correspondence e-mail: thammarat.aree@gmail.com
In the title compound (alternatively called 4′,5,7-trimethoxyflavone methanol solvate hydrate), C18H16O5·CH3OH·H2O, the flavone molecule is almost planar, the interplanar angle between the planes of the benzopyran-4-one group and the attached benzene ring being 4.69 (9)°. In the crystal, the flavone molecule makes intermolecular C—H⋯O hydrogen bonds to adjacent inversion-related flavone molecules, generating R22(8) and R22(14) rings and an infinite ribbon. The inversion-related ribbons are stabilized through the interstitial water and methanol molecules via intermolecular O—H⋯O hydrogen bonds, generating R42(8) and R21(6) rings and C22(4) chains, and are further sustained by π–π interactions with an interplanar spacing of 3.365 (2)Å.
Related literature
For related structures, see: Teh et al. (2005) and the Cambridge Structural Database (Allen, 2002). For the graph-set description of hydrogen-bond patterns, see: Bernstein et al. (1995). For CONQUEST, see: Bruno et al. (2002).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2005); cell SAINT (Bruker, 2005); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and Mercury (Macrae et al. 2006).; software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536809040513/jh2106sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809040513/jh2106Isup2.hkl
The title compound, (I), was extracted from Kaempferia parviflora, a medicinal plant from the north-east of Thailand. Single crystals of (I) were obtained from slow evaporation of a methanol-water (1:1, v/v) solution at room temperature. Because the crystals desolvate very easily, the chosen crystal must be soaked in parafin oil prior to mounting on the tip of a glass fiber.
The water H-atoms were located in a difference
and refined isotropically. All other H atoms were located and then refined using a riding model: C—H = 0.93 Å (aromatic), Uiso(H) = 1.2Ueq(C) and C—H = 0.96 Å (methyl), O—H = 0.82 Å (hydroxyl), Uiso(H) = 1.5Ueq(C/O).The title compound, (I), (4',5,7-trimethoxy-2-phenyl-4H-1-benzopyran -4-one or 4',5,7-trimethoxyflavone methanol solvate hydrate), C18H16O5.CH3OH.H2O (Fig.1), is a secondary metabolite that was isolated from a Thai medicinal plant, Kaempferia parviflora. Several flavones have also been isolated from the same plant and their crystal structures have been reported, see: Teh et al. (2005) and references cited therein. Here we report another
of flavone; water and methanol molecules in the interstices play a key role as hydrogen bonding mediator in stabilizing the entire crystal.The molecular structure of (I) is almost planar; the interplanar angle between the benzopyran-4-one group and the attached phenyl group is 4.69 (9)° (Fig. 1) This observation is consistent with other flavone structures in the Cambridge Structural Database [Version 1.11 (Allen, 2002); CONQUEST (Bruno et al., 2002)]. The three methoxy C-atoms deviate from the mean planes of the two phenyl rings by -0.091 (3), 0.006 (3) and 0.277 (4) Å for atoms C16, C17 and C18, respectively. The corresponding values of torsion angles are: 3.35 (25)°, C16—O4—C3—C2; -2.95 (24)°, C17—O3—C5—C4 and 9.55 (27)°, C18—O5—C13—C12.
In the π–π interactions with an of 3.365 (2) Å (Figs. 3 and 4).
the flavone molecule inclines 48.44 (4)° against the a-b plane and makes intermolecular C—H···O hydrogen bonds to the adjacent inversion-related flavone molecules, generating R22(8), R22(14) rings (Bernstein et al., 1995) and an infinite ribbon along the c axis (Fig. 2). The inversion-related ribbons are stabilized through the interstitial water and methanol molecules via intermolecular O—H···O hydrogen bonds, generating R42(8), R21(6) rings and C22(4) chains (Bernstein et al., 1995) and are further sustained byFor related structures, see: Teh et al. (2005) and the Cambridge Structural Database (Allen, 2002). For the graph-set description of hydrogen-bond patterns, see: Bernstein et al. (1995). For CONQUEST, see: Bruno et al. (2002).
Data collection: APEX2 (Bruker, 2005); cell
SAINT (Bruker, 2005); data reduction: SAINT (Bruker, 2005); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and Mercury (Macrae et al. 2006).; software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. : The structure of (I) with atom numbering and 50% probability displacement ellipsoids. Hydrogen bonds are shown as dashed lines. | |
Fig. 2. : An infinite ribbon formed by the inversion-related flavone molecules that are making C—H···O hydrogen bonds with ring motifs of R22(8) and R22(14). Hydrogen bonds are shown as dashed lines. | |
Fig. 3. : R42(8), R21(6) rings and C22(4) chains generated from the two inversion-related flavone-methanol-hydrate molecules through O—H···O hydrogen bonds. Hydrogen bonds are shown as dashed lines. | |
Fig. 4. : Parellel, infinite ribbons maintained by intermolecular C—H···O, O—H···O hydrogen bonds and π–π interactions. Hydrogen bonds are shown as dashed lines. |
C18H16O5·CH4O·H2O | Z = 2 |
Mr = 362.37 | F(000) = 384 |
Triclinic, P1 | Dx = 1.353 Mg m−3 |
Hall symbol: -P 1 | Melting point: not measured K |
a = 9.5333 (2) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 9.8861 (3) Å | Cell parameters from 3400 reflections |
c = 10.5378 (3) Å | θ = 2.5–30.1° |
α = 86.671 (1)° | µ = 0.10 mm−1 |
β = 66.101 (1)° | T = 298 K |
γ = 78.488 (1)° | Block, colourless |
V = 889.45 (4) Å3 | 0.48 × 0.46 × 0.28 mm |
Bruker SMART APEXII CCD area-detector diffractometer | 5238 independent reflections |
Radiation source: fine-focus sealed tube | 3026 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.027 |
φ and ω scans | θmax = 30.5°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | h = −9→13 |
Tmin = 0.845, Tmax = 0.916 | k = −13→14 |
10931 measured reflections | l = −14→14 |
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)] = 0.052 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.176 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0831P)2 + 0.1044P] where P = (Fo2 + 2Fc2)/3 |
5238 reflections | (Δ/σ)max < 0.001 |
248 parameters | Δρmax = 0.29 e Å−3 |
0 restraints | Δρmin = −0.19 e Å−3 |
C18H16O5·CH4O·H2O | γ = 78.488 (1)° |
Mr = 362.37 | V = 889.45 (4) Å3 |
Triclinic, P1 | Z = 2 |
a = 9.5333 (2) Å | Mo Kα radiation |
b = 9.8861 (3) Å | µ = 0.10 mm−1 |
c = 10.5378 (3) Å | T = 298 K |
α = 86.671 (1)° | 0.48 × 0.46 × 0.28 mm |
β = 66.101 (1)° |
Bruker SMART APEXII CCD area-detector diffractometer | 5238 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | 3026 reflections with I > 2σ(I) |
Tmin = 0.845, Tmax = 0.916 | Rint = 0.027 |
10931 measured reflections |
R[F2 > 2σ(F2)] = 0.052 | 0 restraints |
wR(F2) = 0.176 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | Δρmax = 0.29 e Å−3 |
5238 reflections | Δρmin = −0.19 e Å−3 |
248 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 | ||
C1 | 0.68788 (16) | 0.47269 (15) | 0.38254 (14) | 0.0358 (3) | |
C2 | 0.66882 (17) | 0.35992 (16) | 0.32291 (16) | 0.0412 (3) | |
H2 | 0.6873 | 0.2711 | 0.3544 | 0.049* | |
C3 | 0.62134 (18) | 0.38517 (17) | 0.21510 (16) | 0.0440 (4) | |
C4 | 0.59294 (19) | 0.51854 (18) | 0.16889 (16) | 0.0464 (4) | |
H4 | 0.5621 | 0.5331 | 0.0952 | 0.056* | |
C5 | 0.61000 (17) | 0.62860 (16) | 0.23116 (16) | 0.0414 (4) | |
C6 | 0.65977 (16) | 0.60841 (15) | 0.34281 (14) | 0.0365 (3) | |
C7 | 0.68386 (17) | 0.71706 (16) | 0.41605 (16) | 0.0397 (3) | |
C8 | 0.74295 (17) | 0.66940 (15) | 0.51967 (16) | 0.0398 (3) | |
H8 | 0.7663 | 0.7337 | 0.5654 | 0.048* | |
C9 | 0.76598 (16) | 0.53622 (15) | 0.55337 (15) | 0.0357 (3) | |
C10 | 0.82311 (16) | 0.47626 (15) | 0.65810 (15) | 0.0367 (3) | |
C11 | 0.8392 (2) | 0.33617 (17) | 0.68317 (18) | 0.0481 (4) | |
H11 | 0.8101 | 0.2794 | 0.6346 | 0.058* | |
C12 | 0.8978 (2) | 0.27859 (17) | 0.77914 (19) | 0.0524 (4) | |
H12 | 0.9068 | 0.1844 | 0.7953 | 0.063* | |
C13 | 0.94259 (18) | 0.36194 (17) | 0.85025 (16) | 0.0435 (4) | |
C14 | 0.9241 (2) | 0.50237 (17) | 0.82922 (18) | 0.0502 (4) | |
H14 | 0.9519 | 0.5589 | 0.8790 | 0.060* | |
C15 | 0.8645 (2) | 0.55897 (16) | 0.73453 (17) | 0.0471 (4) | |
H15 | 0.8517 | 0.6538 | 0.7216 | 0.056* | |
C16 | 0.6139 (3) | 0.1483 (2) | 0.1950 (2) | 0.0746 (6) | |
H16A | 0.7186 | 0.1175 | 0.1887 | 0.112* | |
H16B | 0.5930 | 0.0887 | 0.1386 | 0.112* | |
H16C | 0.5413 | 0.1459 | 0.2898 | 0.112* | |
C17 | 0.5388 (3) | 0.7859 (2) | 0.0770 (2) | 0.0683 (6) | |
H17A | 0.6217 | 0.7394 | −0.0043 | 0.102* | |
H17B | 0.5208 | 0.8833 | 0.0617 | 0.102* | |
H17C | 0.4451 | 0.7515 | 0.0960 | 0.102* | |
C18 | 1.0500 (3) | 0.1713 (2) | 0.9532 (2) | 0.0734 (6) | |
H18A | 0.9585 | 0.1306 | 0.9865 | 0.110* | |
H18B | 1.1006 | 0.1529 | 1.0165 | 0.110* | |
H18C | 1.1206 | 0.1324 | 0.8633 | 0.110* | |
O1 | 0.73689 (12) | 0.43770 (10) | 0.48755 (11) | 0.0407 (3) | |
O2 | 0.65502 (15) | 0.84261 (11) | 0.39405 (13) | 0.0565 (3) | |
O3 | 0.58166 (15) | 0.76114 (12) | 0.19255 (13) | 0.0564 (3) | |
O5 | 1.00623 (17) | 0.31561 (13) | 0.94348 (14) | 0.0645 (4) | |
O4 | 0.59709 (17) | 0.28528 (13) | 0.14734 (14) | 0.0622 (4) | |
O1W1 | 0.3293 (2) | 0.95361 (18) | 0.4350 (2) | 0.0783 (5) | |
H1W1 | 0.326 (3) | 1.006 (3) | 0.491 (3) | 0.085 (9)* | |
H2W1 | 0.423 (4) | 0.909 (3) | 0.401 (3) | 0.118 (11)* | |
C1M1 | 0.0302 (3) | 1.0928 (3) | 0.3320 (3) | 0.0925 (8) | |
H1M1 | −0.0014 | 1.0107 | 0.3785 | 0.139* | |
H2M1 | −0.0245 | 1.1223 | 0.2732 | 0.139* | |
H3M1 | 0.0059 | 1.1644 | 0.3997 | 0.139* | |
O1M1 | 0.1882 (2) | 1.0657 (2) | 0.2530 (2) | 0.1045 (6) | |
H4M1 | 0.2341 | 1.0277 | 0.3005 | 0.157* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0318 (7) | 0.0458 (8) | 0.0319 (7) | −0.0084 (6) | −0.0146 (6) | −0.0004 (6) |
C2 | 0.0418 (8) | 0.0431 (8) | 0.0430 (8) | −0.0107 (6) | −0.0197 (7) | −0.0018 (6) |
C3 | 0.0442 (8) | 0.0532 (9) | 0.0404 (8) | −0.0151 (7) | −0.0193 (7) | −0.0059 (7) |
C4 | 0.0491 (9) | 0.0617 (10) | 0.0359 (8) | −0.0135 (7) | −0.0232 (7) | 0.0005 (7) |
C5 | 0.0395 (8) | 0.0489 (9) | 0.0384 (8) | −0.0070 (6) | −0.0190 (6) | 0.0009 (6) |
C6 | 0.0314 (7) | 0.0451 (8) | 0.0343 (7) | −0.0069 (6) | −0.0144 (6) | −0.0015 (6) |
C7 | 0.0379 (8) | 0.0428 (8) | 0.0401 (8) | −0.0036 (6) | −0.0191 (6) | −0.0017 (6) |
C8 | 0.0427 (8) | 0.0399 (8) | 0.0431 (8) | −0.0052 (6) | −0.0240 (7) | −0.0055 (6) |
C9 | 0.0306 (7) | 0.0436 (8) | 0.0349 (7) | −0.0074 (6) | −0.0146 (6) | −0.0032 (6) |
C10 | 0.0325 (7) | 0.0428 (8) | 0.0363 (8) | −0.0062 (6) | −0.0157 (6) | −0.0011 (6) |
C11 | 0.0601 (10) | 0.0449 (9) | 0.0531 (10) | −0.0139 (7) | −0.0349 (8) | 0.0000 (7) |
C12 | 0.0710 (12) | 0.0409 (8) | 0.0579 (11) | −0.0122 (8) | −0.0388 (9) | 0.0070 (7) |
C13 | 0.0454 (8) | 0.0506 (9) | 0.0391 (8) | −0.0068 (7) | −0.0230 (7) | 0.0023 (7) |
C14 | 0.0647 (11) | 0.0472 (9) | 0.0528 (10) | −0.0103 (8) | −0.0372 (9) | −0.0047 (7) |
C15 | 0.0599 (10) | 0.0396 (8) | 0.0518 (10) | −0.0074 (7) | −0.0335 (8) | −0.0005 (7) |
C16 | 0.1022 (17) | 0.0561 (12) | 0.0855 (16) | −0.0196 (11) | −0.0542 (14) | −0.0117 (11) |
C17 | 0.0953 (16) | 0.0674 (12) | 0.0657 (12) | −0.0162 (11) | −0.0574 (12) | 0.0121 (10) |
C18 | 0.0943 (16) | 0.0652 (13) | 0.0775 (14) | −0.0155 (11) | −0.0544 (13) | 0.0231 (11) |
O1 | 0.0474 (6) | 0.0425 (6) | 0.0420 (6) | −0.0110 (5) | −0.0268 (5) | 0.0009 (4) |
O2 | 0.0769 (8) | 0.0409 (6) | 0.0661 (8) | −0.0021 (6) | −0.0472 (7) | −0.0007 (5) |
O3 | 0.0778 (8) | 0.0520 (7) | 0.0570 (8) | −0.0099 (6) | −0.0468 (7) | 0.0064 (6) |
O5 | 0.0891 (10) | 0.0608 (8) | 0.0630 (8) | −0.0100 (7) | −0.0531 (8) | 0.0069 (6) |
O4 | 0.0881 (9) | 0.0601 (8) | 0.0603 (8) | −0.0243 (7) | −0.0464 (7) | −0.0048 (6) |
O1W1 | 0.0728 (11) | 0.0668 (10) | 0.1064 (14) | −0.0040 (8) | −0.0491 (10) | −0.0164 (9) |
C1M1 | 0.0895 (18) | 0.0874 (18) | 0.101 (2) | −0.0153 (14) | −0.0391 (16) | −0.0007 (15) |
O1M1 | 0.0944 (13) | 0.1108 (15) | 0.0973 (14) | −0.0054 (11) | −0.0355 (11) | 0.0138 (11) |
C1—O1 | 1.3683 (16) | C13—O5 | 1.3649 (18) |
C1—C2 | 1.388 (2) | C13—C14 | 1.380 (2) |
C1—C6 | 1.389 (2) | C14—C15 | 1.378 (2) |
C2—C3 | 1.377 (2) | C14—H14 | 0.9300 |
C2—H2 | 0.9300 | C15—H15 | 0.9300 |
C3—O4 | 1.3584 (18) | C16—O4 | 1.418 (2) |
C3—C4 | 1.392 (2) | C16—H16A | 0.9600 |
C4—C5 | 1.372 (2) | C16—H16B | 0.9600 |
C4—H4 | 0.9300 | C16—H16C | 0.9600 |
C5—O3 | 1.3570 (19) | C17—O3 | 1.427 (2) |
C5—C6 | 1.427 (2) | C17—H17A | 0.9600 |
C6—C7 | 1.463 (2) | C17—H17B | 0.9600 |
C7—O2 | 1.2458 (18) | C17—H17C | 0.9600 |
C7—C8 | 1.437 (2) | C18—O5 | 1.414 (2) |
C8—C9 | 1.342 (2) | C18—H18A | 0.9600 |
C8—H8 | 0.9300 | C18—H18B | 0.9600 |
C9—O1 | 1.3597 (16) | C18—H18C | 0.9600 |
C9—C10 | 1.4656 (19) | O1W1—H1W1 | 0.80 (3) |
C10—C11 | 1.385 (2) | O1W1—H2W1 | 0.85 (3) |
C10—C15 | 1.391 (2) | C1M1—O1M1 | 1.373 (3) |
C11—C12 | 1.387 (2) | C1M1—H1M1 | 0.9600 |
C11—H11 | 0.9300 | C1M1—H2M1 | 0.9600 |
C12—C13 | 1.376 (2) | C1M1—H3M1 | 0.9600 |
C12—H12 | 0.9300 | O1M1—H4M1 | 0.8200 |
O1—C1—C2 | 113.11 (13) | C12—C13—C14 | 120.00 (14) |
O1—C1—C6 | 122.23 (12) | C15—C14—C13 | 120.15 (14) |
C2—C1—C6 | 124.65 (13) | C15—C14—H14 | 119.9 |
C3—C2—C1 | 117.17 (14) | C13—C14—H14 | 119.9 |
C3—C2—H2 | 121.4 | C14—C15—C10 | 120.92 (15) |
C1—C2—H2 | 121.4 | C14—C15—H15 | 119.5 |
O4—C3—C2 | 123.74 (15) | C10—C15—H15 | 119.5 |
O4—C3—C4 | 115.09 (13) | O4—C16—H16A | 109.5 |
C2—C3—C4 | 121.16 (13) | O4—C16—H16B | 109.5 |
C5—C4—C3 | 120.54 (14) | H16A—C16—H16B | 109.5 |
C5—C4—H4 | 119.7 | O4—C16—H16C | 109.5 |
C3—C4—H4 | 119.7 | H16A—C16—H16C | 109.5 |
O3—C5—C4 | 123.39 (13) | H16B—C16—H16C | 109.5 |
O3—C5—C6 | 115.92 (13) | O3—C17—H17A | 109.5 |
C4—C5—C6 | 120.69 (14) | O3—C17—H17B | 109.5 |
C1—C6—C5 | 115.76 (12) | H17A—C17—H17B | 109.5 |
C1—C6—C7 | 118.57 (12) | O3—C17—H17C | 109.5 |
C5—C6—C7 | 125.67 (13) | H17A—C17—H17C | 109.5 |
O2—C7—C8 | 120.81 (13) | H17B—C17—H17C | 109.5 |
O2—C7—C6 | 124.13 (13) | O5—C18—H18A | 109.5 |
C8—C7—C6 | 115.05 (13) | O5—C18—H18B | 109.5 |
C9—C8—C7 | 122.92 (13) | H18A—C18—H18B | 109.5 |
C9—C8—H8 | 118.5 | O5—C18—H18C | 109.5 |
C7—C8—H8 | 118.5 | H18A—C18—H18C | 109.5 |
C8—C9—O1 | 120.88 (12) | H18B—C18—H18C | 109.5 |
C8—C9—C10 | 127.70 (12) | C9—O1—C1 | 120.21 (11) |
O1—C9—C10 | 111.42 (12) | C5—O3—C17 | 117.97 (13) |
C11—C10—C15 | 117.96 (13) | C13—O5—C18 | 117.91 (13) |
C11—C10—C9 | 121.38 (12) | C3—O4—C16 | 118.09 (14) |
C15—C10—C9 | 120.66 (13) | H1W1—O1W1—H2W1 | 105 (3) |
C10—C11—C12 | 121.46 (14) | O1M1—C1M1—H1M1 | 109.5 |
C10—C11—H11 | 119.3 | O1M1—C1M1—H2M1 | 109.5 |
C12—C11—H11 | 119.3 | H1M1—C1M1—H2M1 | 109.5 |
C13—C12—C11 | 119.46 (15) | O1M1—C1M1—H3M1 | 109.5 |
C13—C12—H12 | 120.3 | H1M1—C1M1—H3M1 | 109.5 |
C11—C12—H12 | 120.3 | H2M1—C1M1—H3M1 | 109.5 |
O5—C13—C12 | 124.34 (15) | C1M1—O1M1—H4M1 | 109.5 |
O5—C13—C14 | 115.66 (13) | ||
O1—C1—C2—C3 | −179.29 (13) | C8—C9—C10—C11 | 179.11 (15) |
C6—C1—C2—C3 | 1.2 (2) | O1—C9—C10—C11 | −1.3 (2) |
C1—C2—C3—O4 | −179.64 (15) | C8—C9—C10—C15 | −1.6 (2) |
C1—C2—C3—C4 | −0.4 (2) | O1—C9—C10—C15 | 178.04 (13) |
O4—C3—C4—C5 | 178.57 (15) | C15—C10—C11—C12 | −1.4 (2) |
C2—C3—C4—C5 | −0.8 (2) | C9—C10—C11—C12 | 177.97 (15) |
C3—C4—C5—O3 | −178.88 (14) | C10—C11—C12—C13 | −0.7 (3) |
C3—C4—C5—C6 | 1.1 (2) | C11—C12—C13—O5 | −177.82 (16) |
O1—C1—C6—C5 | 179.68 (13) | C11—C12—C13—C14 | 2.2 (3) |
C2—C1—C6—C5 | −0.9 (2) | O5—C13—C14—C15 | 178.39 (15) |
O1—C1—C6—C7 | 0.1 (2) | C12—C13—C14—C15 | −1.6 (3) |
C2—C1—C6—C7 | 179.53 (14) | C13—C14—C15—C10 | −0.5 (3) |
O3—C5—C6—C1 | 179.67 (13) | C11—C10—C15—C14 | 1.9 (2) |
C4—C5—C6—C1 | −0.3 (2) | C9—C10—C15—C14 | −177.40 (14) |
O3—C5—C6—C7 | −0.8 (2) | C8—C9—O1—C1 | 2.0 (2) |
C4—C5—C6—C7 | 179.24 (14) | C10—C9—O1—C1 | −177.67 (11) |
C1—C6—C7—O2 | −176.29 (14) | C2—C1—O1—C9 | 177.81 (12) |
C5—C6—C7—O2 | 4.2 (2) | C6—C1—O1—C9 | −2.7 (2) |
C1—C6—C7—C8 | 3.0 (2) | C4—C5—O3—C17 | −2.9 (2) |
C5—C6—C7—C8 | −176.58 (14) | C6—C5—O3—C17 | 177.07 (15) |
O2—C7—C8—C9 | 175.49 (15) | C12—C13—O5—C18 | 9.6 (3) |
C6—C7—C8—C9 | −3.8 (2) | C14—C13—O5—C18 | −170.45 (18) |
C7—C8—C9—O1 | 1.4 (2) | C2—C3—O4—C16 | 3.4 (3) |
C7—C8—C9—C10 | −179.01 (14) | C4—C3—O4—C16 | −175.96 (16) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1W1—H1W1···O2i | 0.80 (3) | 2.06 (3) | 2.844 (2) | 169 (3) |
O1W1—H2W1···O2 | 0.85 (3) | 2.15 (3) | 2.940 (2) | 154 (3) |
O1W1—H2W1···O3 | 0.85 (3) | 2.45 (3) | 3.113 (2) | 134 (3) |
O1M1—H4M1···O1W1 | 0.82 | 2.01 | 2.822 (3) | 173 |
C14—H14···O5ii | 0.93 | 2.50 | 3.418 (2) | 168 |
C17—H17C···O4iii | 0.96 | 2.81 | 3.287 (2) | 112 |
Symmetry codes: (i) −x+1, −y+2, −z+1; (ii) −x+2, −y+1, −z+2; (iii) −x+1, −y+1, −z. |
Experimental details
Crystal data | |
Chemical formula | C18H16O5·CH4O·H2O |
Mr | 362.37 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 298 |
a, b, c (Å) | 9.5333 (2), 9.8861 (3), 10.5378 (3) |
α, β, γ (°) | 86.671 (1), 66.101 (1), 78.488 (1) |
V (Å3) | 889.45 (4) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.48 × 0.46 × 0.28 |
Data collection | |
Diffractometer | Bruker SMART APEXII CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2005) |
Tmin, Tmax | 0.845, 0.916 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 10931, 5238, 3026 |
Rint | 0.027 |
(sin θ/λ)max (Å−1) | 0.713 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.052, 0.176, 1.04 |
No. of reflections | 5238 |
No. of parameters | 248 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.29, −0.19 |
Computer programs: APEX2 (Bruker, 2005), SAINT (Bruker, 2005), SHELXTL (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997) and Mercury (Macrae et al. 2006)..
D—H···A | D—H | H···A | D···A | D—H···A |
O1W1—H1W1···O2i | 0.80 (3) | 2.06 (3) | 2.844 (2) | 169 (3) |
O1W1—H2W1···O2 | 0.85 (3) | 2.15 (3) | 2.940 (2) | 154 (3) |
O1W1—H2W1···O3 | 0.85 (3) | 2.45 (3) | 3.113 (2) | 134 (3) |
O1M1—H4M1···O1W1 | 0.82 | 2.01 | 2.822 (3) | 172.7 |
C14—H14···O5ii | 0.93 | 2.50 | 3.418 (2) | 167.9 |
C17—H17C···O4iii | 0.96 | 2.81 | 3.287 (2) | 111.9 |
Symmetry codes: (i) −x+1, −y+2, −z+1; (ii) −x+2, −y+1, −z+2; (iii) −x+1, −y+1, −z. |
Acknowledgements
This work is supported by the Department of Chemistry and Research Funds from the Faculty of Science, Chulalongkorn University to TA and by the Thailand Research Fund and the Commission on Higher Education (grant No. MRG4980018) to PS
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.
The title compound, (I), (4',5,7-trimethoxy-2-phenyl-4H-1-benzopyran -4-one or 4',5,7-trimethoxyflavone methanol solvate hydrate), C18H16O5.CH3OH.H2O (Fig.1), is a secondary metabolite that was isolated from a Thai medicinal plant, Kaempferia parviflora. Several flavones have also been isolated from the same plant and their crystal structures have been reported, see: Teh et al. (2005) and references cited therein. Here we report another crystal structure of flavone; water and methanol molecules in the interstices play a key role as hydrogen bonding mediator in stabilizing the entire crystal.
The molecular structure of (I) is almost planar; the interplanar angle between the benzopyran-4-one group and the attached phenyl group is 4.69 (9)° (Fig. 1) This observation is consistent with other flavone structures in the Cambridge Structural Database [Version 1.11 (Allen, 2002); CONQUEST (Bruno et al., 2002)]. The three methoxy C-atoms deviate from the mean planes of the two phenyl rings by -0.091 (3), 0.006 (3) and 0.277 (4) Å for atoms C16, C17 and C18, respectively. The corresponding values of torsion angles are: 3.35 (25)°, C16—O4—C3—C2; -2.95 (24)°, C17—O3—C5—C4 and 9.55 (27)°, C18—O5—C13—C12.
In the crystal lattice, the flavone molecule inclines 48.44 (4)° against the a-b plane and makes intermolecular C—H···O hydrogen bonds to the adjacent inversion-related flavone molecules, generating R22(8), R22(14) rings (Bernstein et al., 1995) and an infinite ribbon along the c axis (Fig. 2). The inversion-related ribbons are stabilized through the interstitial water and methanol molecules via intermolecular O—H···O hydrogen bonds, generating R42(8), R21(6) rings and C22(4) chains (Bernstein et al., 1995) and are further sustained by π–π interactions with an interplanar spacing of 3.365 (2) Å (Figs. 3 and 4).