organic compounds
(2,4-Dihydroxy-6-methoxyphenyl)(3,5-dihydroxyphenyl)methanone monohydrate
aSchool of Chemical Sciences, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, bCrystal Materials Research Unit, Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand, and cX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
*Correspondence e-mail: hkfun@usm.my
The title benzophenone compound, C14H12O6·H2O, was isolated from the bark of Garcinia hombroniana Pierre (Guttiferae). The molecule is twisted, the dihedral angle between the two benzene rings being 59.13 (7)°. The methoxy group is approximately coplanar with the attached benzene ring, with a C—O—C—C torsion angle of 1.91 (18)°. The water molecule is disordered over two positions in a 0.555 (19):0.445 (19) ratio. An intramolecular O—H⋯O hydrogen bond generates an S(6) ring motif. The is stabilized by intermolecular O—H⋯O hydrogen bonds. These interactions link the molecules into sheets parallel to the ac plane. The sheets are stacked along the b axis by π–π interactions, with centroid–centroid distances of 3.6219 (7) Å. A weak O—H⋯π interaction was also noted.
Related literature
For details of hydrogen-bond motifs, see: Bernstein et al. (1995). For background to benzophenones and their bioactivity, see: Khanum et al. (2009); Pereira et al. (2010); Tzanova et al. (2009). For background to Guttiferae plants, see: Jayaprakasha et al. (2006); Mahabusarakum et al. (1983); Ngoupayo et al. (2009); Pereira et al. (2010); Phongpaichit et al. (1994); Smitinand (2001); Zadernowski et al. (2009); Zhang et al. (2010). For related structures, see: Betz et al. (2011); Li et al. (2010). For stability of the temperature controller used in the data collection, see Cosier & Glazer (1986).
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: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536811037913/tk2790sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811037913/tk2790Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811037913/tk2790Isup3.cml
The air-dried and ground bark (5.2 kg) of G. hombroniana was extracted (Soxhlet) successively with n-hexane, dichloromethane, ethyl acetate and methanol. The ethyl acetate extract (18 g) was subjected to silica gel
(CC) using hexane-chloroform-ethyl acetate-methanol gradient, affording 40 fractions (FE1- FE40). Fractions FE23-FE29 were combined and fractionated using silica gel CC with chloroform-acetone gradient which afforded another fraction FEb. The title compound (I) was isolated from the fraction FEb in the form of shiny yellow crystals by silica gel CC with chloroform-acetone (3:2 v/v) as eluting solvent. The melting point determined was 516-519 K.Hydroxy H atoms were located from a Fourier difference map and isotropically refined. The C-bound H atoms were placed in calculated positions with d(C—H) = 0.95 Å for aromatic and 0.98 Å for CH3 atoms. The Uiso values were constrained to be 1.5Ueq of the
for O and methyl H atoms, and 1.2Ueq for the remaining H atoms. A rotating group model was used for the methyl groups. The water molecule was found to be disordered over two sites in a 0.555 (19): 0.445 (19) occupancy ratio (from refinement). The water-bound H1W1, H2W1, H1WX and H2WX atoms were located from a difference Fourier map and fixed in these positions with Uiso(H) = 1.5 Ueq(O)Garcinia is traditionally used for the treatment of abdominal pain, dysentery, diarrhea, suppuration, infected wounds, leucorrhoea, chronic ulcers and gonorrhea (Jayaprakasha et al., 2006). Most Garcinia species are trees but some are shrubs or treelets and are rich sources of bioactive compounds including xanthones,
benzophenones, and phenolic acids (Mahabusarakum et al., 1983; Ngoupayo et al., 2009; Pereira et al., 2010; Phongpaichit et al., 1994; Zadernowski et al., 2009; Zhang et al., 2010). Garcinia hombroniana Pierre (Guttiferae), commonly called seashore mangosteen or pokok bruas (Malay), is indigenous in Malaysia and widely distributed in the southern part of Thailand where it is known as "wa" (Smitinand, 2001). During the course of our investigation of G. hombroniana, we have isolated the title benzophenone compound (I) from the ethyl acetate extract of the bark. Benzophenones have been found to possess antioxidant (Tzanova et al., 2009), anti-inflammatory (Khanum et al., 2009) and leishmanicidal (Pereira et al., 2010) activities.The molecule of the title benzophenone which crystallized as a monohydrate (Fig. 1) is twisted with the dihedral angle between the 2,4-dihydroxy-6-methoxyphenyl and 3,5-dihydroxyphenyl rings being 59.13 (7)°, whereas the triangular Caryl-C(═O)-Caryl fragment (C1/C7/C8/O1) makes dihedral angles of 25.16 (7) and 43.44 (8)° with the 2,4-dihydroxy-6-methoxyphenyl and 3,5-dihydroxyphenyl rings, respectively. The two hydroxy groups and the methoxy groups of the 2,4-dihydroxy-6-methoxyphenyl residue are co-planar with the benzene ring with a r.m.s. of 0.0459 (1) Å for the ten non-H atoms and the torsion angle C14–O1–C6–C5 = 1.91 (18)°. The two hydroxy groups of the 3,5-dihydroxyphenyl are also co-planar with the r.m.s. of 0.0083 (1) Å for the eight non-H atoms. An intramolecular O2—H1O2···O1 hydrogen bond generates a S(6) ring motif (Bernstein et al., 1995) (Fig. 1 and Table 1). The bond distances are comparable with the related structures (Betz et al., 2011; Li et al., 2010). The water molecule is disordered over two positions in a 0.555 (19):0.445 (19) ratio.
The crystal is stabilized by intermolecular O—H···O hydrogen bonds. These interactions link the molecules into sheets parallel to the ac plane (Fig. 2). These sheets are stacked along the b axis by π···π interaction with the Cg1···Cg1 distance of 3.6219 (7) Å (symmetry code 1-x, -y, 1-z) where Cg1 is the centroid of the C1–C6 benzene ring. A weak O—H···π interaction was also observed (Table 1).
For details of hydrogen-bond motifs, see: Bernstein et al. (1995). For background to benzophenones and their bioactivity, see: Khanum et al. (2009); Pereira et al. (2010); Tzanova et al. (2009). For background to Guttiferae plants, see: Jayaprakasha et al. (2006); Mahabusarakum et al. (1983); Ngoupayo et al. (2009); Pereira et al. (2010); Phongpaichit et al. (1994); Smitinand (2001); Zadernowski et al. (2009); Zhang et al. (2010). For related structures, see: Betz et al. (2011); Li et al. (2010). For stability of the temperature controller used in the data collection, see Cosier & Glazer (1986).
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: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).Fig. 1. The molecular structure of the title compound, with 50% probability displacement ellipsoids and the atom-numbering scheme. Open bonds show the minor component of the disordered water molecule. The hydrogen bond is shown as a dashed line. | |
Fig. 2. The crystal packing of the title compound with only the major component of the water molecule shown, viewed down the b axis, showing sheets parallel to the ac plane. Hydrogen bonds are shown as dashed lines. |
C14H12O6·H2O | Z = 2 |
Mr = 294.25 | F(000) = 308 |
Triclinic, P1 | Dx = 1.498 Mg m−3 |
Hall symbol: -P 1 | Melting point = 516–519 K |
a = 7.7087 (1) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 8.4050 (1) Å | Cell parameters from 4696 reflections |
c = 11.2380 (1) Å | θ = 1.9–32.5° |
α = 82.401 (1)° | µ = 0.12 mm−1 |
β = 75.570 (1)° | T = 100 K |
γ = 67.842 (1)° | Plate, yellow |
V = 652.49 (1) Å3 | 0.42 × 0.33 × 0.10 mm |
Bruker APEXII CCD area-detector diffractometer | 4696 independent reflections |
Radiation source: sealed tube | 4220 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.023 |
φ and ω scans | θmax = 32.5°, θmin = 1.9° |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | h = −11→11 |
Tmin = 0.951, Tmax = 0.988 | k = −12→12 |
19157 measured reflections | l = −16→16 |
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) = 0.131 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.17 | w = 1/[σ2(Fo2) + (0.038P)2 + 0.633P] where P = (Fo2 + 2Fc2)/3 |
4696 reflections | (Δ/σ)max = 0.001 |
217 parameters | Δρmax = 0.51 e Å−3 |
0 restraints | Δρmin = −0.31 e Å−3 |
C14H12O6·H2O | γ = 67.842 (1)° |
Mr = 294.25 | V = 652.49 (1) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.7087 (1) Å | Mo Kα radiation |
b = 8.4050 (1) Å | µ = 0.12 mm−1 |
c = 11.2380 (1) Å | T = 100 K |
α = 82.401 (1)° | 0.42 × 0.33 × 0.10 mm |
β = 75.570 (1)° |
Bruker APEXII CCD area-detector diffractometer | 4696 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | 4220 reflections with I > 2σ(I) |
Tmin = 0.951, Tmax = 0.988 | Rint = 0.023 |
19157 measured reflections |
R[F2 > 2σ(F2)] = 0.052 | 0 restraints |
wR(F2) = 0.131 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.17 | Δρmax = 0.51 e Å−3 |
4696 reflections | Δρmin = −0.31 e Å−3 |
217 parameters |
Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 120.0 (1) K. |
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) | |
O1 | 0.02024 (14) | 0.10822 (14) | 0.58801 (9) | 0.01558 (19) | |
O2 | 0.18999 (14) | 0.13186 (13) | 0.36467 (9) | 0.01292 (18) | |
H1O2 | 0.114 (4) | 0.106 (4) | 0.432 (3) | 0.044 (7)* | |
O3 | 0.74976 (15) | 0.27372 (15) | 0.28766 (10) | 0.0168 (2) | |
H1O3 | 0.757 (4) | 0.250 (3) | 0.215 (2) | 0.032 (6)* | |
O4 | 0.40238 (14) | 0.24500 (14) | 0.69771 (9) | 0.01396 (19) | |
O5 | −0.23219 (17) | 0.21024 (15) | 1.05072 (9) | 0.0191 (2) | |
H1O5 | −0.247 (4) | 0.123 (3) | 1.035 (2) | 0.036 (7)* | |
O6 | −0.12705 (15) | 0.70856 (13) | 0.85592 (10) | 0.01557 (19) | |
H1O6 | −0.114 (4) | 0.751 (4) | 0.789 (3) | 0.040 (7)* | |
C1 | 0.27991 (17) | 0.20544 (16) | 0.53565 (11) | 0.0104 (2) | |
C2 | 0.31206 (17) | 0.17912 (16) | 0.40884 (11) | 0.0106 (2) | |
C3 | 0.46478 (18) | 0.20447 (17) | 0.32314 (12) | 0.0125 (2) | |
H3A | 0.4796 | 0.1921 | 0.2380 | 0.015* | |
C4 | 0.59587 (18) | 0.24845 (17) | 0.36499 (12) | 0.0121 (2) | |
C5 | 0.57783 (18) | 0.26523 (17) | 0.49021 (12) | 0.0128 (2) | |
H5A | 0.6706 | 0.2921 | 0.5172 | 0.015* | |
C6 | 0.42273 (17) | 0.24217 (16) | 0.57445 (11) | 0.0110 (2) | |
C7 | 0.10655 (17) | 0.19008 (16) | 0.61790 (12) | 0.0110 (2) | |
C8 | 0.01674 (17) | 0.28193 (16) | 0.73582 (11) | 0.0107 (2) | |
C9 | −0.06148 (18) | 0.19737 (17) | 0.83798 (12) | 0.0126 (2) | |
H9A | −0.0505 | 0.0816 | 0.8341 | 0.015* | |
C10 | −0.15600 (19) | 0.28606 (17) | 0.94574 (12) | 0.0131 (2) | |
C11 | −0.17726 (19) | 0.45713 (17) | 0.95104 (12) | 0.0137 (2) | |
H11A | −0.2429 | 0.5169 | 1.0247 | 0.016* | |
C12 | −0.10135 (18) | 0.53944 (16) | 0.84732 (12) | 0.0117 (2) | |
C13 | −0.00183 (18) | 0.45267 (17) | 0.73944 (12) | 0.0120 (2) | |
H13A | 0.0524 | 0.5089 | 0.6696 | 0.014* | |
C14 | 0.54604 (19) | 0.27856 (19) | 0.73956 (13) | 0.0159 (2) | |
H14A | 0.5188 | 0.2715 | 0.8297 | 0.024* | |
H14B | 0.5450 | 0.3939 | 0.7101 | 0.024* | |
H14C | 0.6725 | 0.1932 | 0.7076 | 0.024* | |
O1W | 0.6637 (7) | 0.9646 (10) | 0.0189 (7) | 0.0211 (11) | 0.555 (19) |
H1W1 | 0.7461 | 0.8666 | −0.0151 | 0.032* | 0.555 (19) |
H2W1 | 0.5642 | 0.9957 | −0.0002 | 0.032* | 0.555 (19) |
O1WX | 0.6960 (8) | 0.9169 (9) | 0.0518 (6) | 0.0125 (9) | 0.445 (19) |
H1WX | 0.6896 | 0.8759 | 0.1225 | 0.019* | 0.445 (19) |
H2WX | 0.7964 | 0.8353 | 0.0173 | 0.019* | 0.445 (19) |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0153 (4) | 0.0209 (5) | 0.0142 (4) | −0.0110 (4) | −0.0001 (3) | −0.0048 (4) |
O2 | 0.0146 (4) | 0.0173 (4) | 0.0104 (4) | −0.0096 (4) | −0.0028 (3) | −0.0006 (3) |
O3 | 0.0162 (4) | 0.0256 (5) | 0.0107 (4) | −0.0129 (4) | 0.0013 (3) | 0.0001 (4) |
O4 | 0.0120 (4) | 0.0231 (5) | 0.0088 (4) | −0.0084 (4) | −0.0019 (3) | −0.0021 (3) |
O5 | 0.0306 (6) | 0.0212 (5) | 0.0093 (4) | −0.0173 (4) | 0.0021 (4) | −0.0008 (4) |
O6 | 0.0230 (5) | 0.0115 (4) | 0.0118 (4) | −0.0067 (4) | −0.0022 (4) | −0.0006 (3) |
C1 | 0.0097 (5) | 0.0119 (5) | 0.0097 (5) | −0.0046 (4) | −0.0009 (4) | −0.0013 (4) |
C2 | 0.0112 (5) | 0.0110 (5) | 0.0102 (5) | −0.0041 (4) | −0.0029 (4) | −0.0013 (4) |
C3 | 0.0134 (5) | 0.0154 (5) | 0.0096 (5) | −0.0068 (4) | −0.0012 (4) | −0.0005 (4) |
C4 | 0.0114 (5) | 0.0142 (5) | 0.0110 (5) | −0.0063 (4) | −0.0007 (4) | 0.0002 (4) |
C5 | 0.0122 (5) | 0.0161 (5) | 0.0113 (5) | −0.0071 (4) | −0.0015 (4) | −0.0011 (4) |
C6 | 0.0110 (5) | 0.0131 (5) | 0.0095 (5) | −0.0050 (4) | −0.0020 (4) | −0.0013 (4) |
C7 | 0.0103 (5) | 0.0121 (5) | 0.0104 (5) | −0.0041 (4) | −0.0017 (4) | −0.0013 (4) |
C8 | 0.0098 (5) | 0.0133 (5) | 0.0091 (5) | −0.0045 (4) | −0.0015 (4) | −0.0014 (4) |
C9 | 0.0132 (5) | 0.0137 (5) | 0.0117 (5) | −0.0062 (4) | −0.0011 (4) | −0.0015 (4) |
C10 | 0.0148 (5) | 0.0166 (6) | 0.0093 (5) | −0.0082 (5) | −0.0014 (4) | 0.0002 (4) |
C11 | 0.0159 (5) | 0.0156 (6) | 0.0098 (5) | −0.0066 (5) | −0.0006 (4) | −0.0019 (4) |
C12 | 0.0122 (5) | 0.0117 (5) | 0.0114 (5) | −0.0038 (4) | −0.0029 (4) | −0.0017 (4) |
C13 | 0.0124 (5) | 0.0129 (5) | 0.0105 (5) | −0.0053 (4) | −0.0008 (4) | −0.0008 (4) |
C14 | 0.0139 (5) | 0.0225 (6) | 0.0136 (6) | −0.0070 (5) | −0.0043 (4) | −0.0046 (5) |
O1W | 0.0180 (11) | 0.0201 (19) | 0.026 (2) | −0.0063 (12) | −0.0030 (12) | −0.0079 (18) |
O1WX | 0.0132 (13) | 0.0121 (16) | 0.0115 (15) | −0.0032 (12) | −0.0041 (10) | 0.0009 (12) |
O1—C7 | 1.2437 (16) | C5—H5A | 0.9500 |
O2—C2 | 1.3626 (15) | C7—C8 | 1.4972 (18) |
O2—H1O2 | 0.89 (3) | C8—C13 | 1.3925 (18) |
O3—C4 | 1.3546 (15) | C8—C9 | 1.3961 (17) |
O3—H1O3 | 0.85 (3) | C9—C10 | 1.3937 (18) |
O4—C6 | 1.3570 (15) | C9—H9A | 0.9500 |
O4—C14 | 1.4344 (16) | C10—C11 | 1.3920 (19) |
O5—C10 | 1.3715 (16) | C11—C12 | 1.3900 (18) |
O5—H1O5 | 0.83 (3) | C11—H11A | 0.9500 |
O6—C12 | 1.3724 (16) | C12—C13 | 1.3923 (17) |
O6—H1O6 | 0.79 (3) | C13—H13A | 0.9500 |
C1—C2 | 1.4168 (17) | C14—H14A | 0.9800 |
C1—C6 | 1.4244 (17) | C14—H14B | 0.9800 |
C1—C7 | 1.4628 (17) | C14—H14C | 0.9800 |
C2—C3 | 1.3888 (17) | O1W—H1W1 | 0.8916 |
C3—C4 | 1.3942 (18) | O1W—H2W1 | 0.7867 |
C3—H3A | 0.9500 | O1WX—H1WX | 0.8209 |
C4—C5 | 1.3998 (18) | O1WX—H2WX | 0.8602 |
C5—C6 | 1.3876 (17) | ||
C2—O2—H1O2 | 104.3 (18) | C13—C8—C9 | 121.23 (12) |
C4—O3—H1O3 | 109.9 (16) | C13—C8—C7 | 120.11 (11) |
C6—O4—C14 | 117.37 (10) | C9—C8—C7 | 118.45 (11) |
C10—O5—H1O5 | 110.8 (18) | C10—C9—C8 | 118.71 (12) |
C12—O6—H1O6 | 109 (2) | C10—C9—H9A | 120.6 |
C2—C1—C6 | 116.96 (11) | C8—C9—H9A | 120.6 |
C2—C1—C7 | 118.58 (11) | O5—C10—C11 | 116.99 (12) |
C6—C1—C7 | 124.45 (11) | O5—C10—C9 | 122.05 (12) |
O2—C2—C3 | 116.67 (11) | C11—C10—C9 | 120.96 (12) |
O2—C2—C1 | 121.07 (11) | C12—C11—C10 | 119.21 (12) |
C3—C2—C1 | 122.23 (11) | C12—C11—H11A | 120.4 |
C2—C3—C4 | 118.45 (12) | C10—C11—H11A | 120.4 |
C2—C3—H3A | 120.8 | O6—C12—C11 | 117.41 (11) |
C4—C3—H3A | 120.8 | O6—C12—C13 | 121.52 (12) |
O3—C4—C3 | 122.18 (12) | C11—C12—C13 | 121.06 (12) |
O3—C4—C5 | 116.18 (11) | C12—C13—C8 | 118.81 (12) |
C3—C4—C5 | 121.63 (12) | C12—C13—H13A | 120.6 |
C6—C5—C4 | 119.19 (12) | C8—C13—H13A | 120.6 |
C6—C5—H5A | 120.4 | O4—C14—H14A | 109.5 |
C4—C5—H5A | 120.4 | O4—C14—H14B | 109.5 |
O4—C6—C5 | 122.54 (11) | H14A—C14—H14B | 109.5 |
O4—C6—C1 | 116.13 (11) | O4—C14—H14C | 109.5 |
C5—C6—C1 | 121.26 (12) | H14A—C14—H14C | 109.5 |
O1—C7—C1 | 120.63 (11) | H14B—C14—H14C | 109.5 |
O1—C7—C8 | 117.04 (11) | H1W1—O1W—H2W1 | 112.7 |
C1—C7—C8 | 122.17 (11) | H1WX—O1WX—H2WX | 97.6 |
C6—C1—C2—O2 | 175.50 (11) | C6—C1—C7—O1 | −157.57 (13) |
C7—C1—C2—O2 | −3.32 (18) | C2—C1—C7—C8 | −154.00 (12) |
C6—C1—C2—C3 | −6.35 (19) | C6—C1—C7—C8 | 27.27 (19) |
C7—C1—C2—C3 | 174.83 (12) | O1—C7—C8—C13 | −132.18 (13) |
O2—C2—C3—C4 | −178.32 (11) | C1—C7—C8—C13 | 43.14 (18) |
C1—C2—C3—C4 | 3.46 (19) | O1—C7—C8—C9 | 42.51 (17) |
C2—C3—C4—O3 | 179.32 (12) | C1—C7—C8—C9 | −142.18 (13) |
C2—C3—C4—C5 | 0.8 (2) | C13—C8—C9—C10 | −1.36 (19) |
O3—C4—C5—C6 | 179.57 (12) | C7—C8—C9—C10 | −175.99 (11) |
C3—C4—C5—C6 | −1.8 (2) | C8—C9—C10—O5 | −178.31 (12) |
C14—O4—C6—C5 | 1.91 (18) | C8—C9—C10—C11 | 1.8 (2) |
C14—O4—C6—C1 | 178.89 (11) | O5—C10—C11—C12 | 179.54 (12) |
C4—C5—C6—O4 | 175.49 (12) | C9—C10—C11—C12 | −0.5 (2) |
C4—C5—C6—C1 | −1.3 (2) | C10—C11—C12—O6 | 179.35 (12) |
C2—C1—C6—O4 | −171.78 (11) | C10—C11—C12—C13 | −1.2 (2) |
C7—C1—C6—O4 | 6.96 (19) | O6—C12—C13—C8 | −178.96 (12) |
C2—C1—C6—C5 | 5.23 (19) | C11—C12—C13—C8 | 1.58 (19) |
C7—C1—C6—C5 | −176.02 (12) | C9—C8—C13—C12 | −0.30 (19) |
C2—C1—C7—O1 | 21.15 (19) | C7—C8—C13—C12 | 174.24 (11) |
Cg2 is the centroid of the C8–C13 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H1O2···O1 | 0.89 (3) | 1.72 (3) | 2.5453 (14) | 152 (3) |
O2—H1O2···O1i | 0.89 (3) | 2.45 (3) | 2.9554 (16) | 117 (3) |
O3—H1O3···O5ii | 0.85 (2) | 1.90 (2) | 2.7440 (15) | 177 (3) |
O5—H1O5···O1Wiii | 0.83 (3) | 1.76 (3) | 2.574 (7) | 166 (3) |
O6—H1O6···O2iv | 0.79 (3) | 1.98 (3) | 2.7220 (15) | 157 (3) |
O1W—H1W1···O6ii | 0.89 | 1.91 | 2.746 (8) | 156 |
C14—H14C···O1v | 0.98 | 2.55 | 3.4507 (19) | 152 |
O1WX—H2WX···Cg2vi | 0.86 | 2.89 | 3.402 (7) | 120 |
Symmetry codes: (i) −x, −y, −z+1; (ii) x+1, y, z−1; (iii) x−1, y−1, z+1; (iv) −x, −y+1, −z+1; (v) x+1, y, z; (vi) −x+1, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C14H12O6·H2O |
Mr | 294.25 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 100 |
a, b, c (Å) | 7.7087 (1), 8.4050 (1), 11.2380 (1) |
α, β, γ (°) | 82.401 (1), 75.570 (1), 67.842 (1) |
V (Å3) | 652.49 (1) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.12 |
Crystal size (mm) | 0.42 × 0.33 × 0.10 |
Data collection | |
Diffractometer | Bruker APEXII CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2005) |
Tmin, Tmax | 0.951, 0.988 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 19157, 4696, 4220 |
Rint | 0.023 |
(sin θ/λ)max (Å−1) | 0.756 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.052, 0.131, 1.17 |
No. of reflections | 4696 |
No. of parameters | 217 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.51, −0.31 |
Computer programs: APEX2 (Bruker, 2005), SAINT (Bruker, 2005), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
Cg2 is the centroid of the C8–C13 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H1O2···O1 | 0.89 (3) | 1.72 (3) | 2.5453 (14) | 152 (3) |
O2—H1O2···O1i | 0.89 (3) | 2.45 (3) | 2.9554 (16) | 117 (3) |
O3—H1O3···O5ii | 0.85 (2) | 1.90 (2) | 2.7440 (15) | 177 (3) |
O5—H1O5···O1Wiii | 0.83 (3) | 1.76 (3) | 2.574 (7) | 166 (3) |
O6—H1O6···O2iv | 0.79 (3) | 1.98 (3) | 2.7220 (15) | 157 (3) |
O1W—H1W1···O6ii | 0.89 | 1.91 | 2.746 (8) | 156 |
C14—H14C···O1v | 0.98 | 2.55 | 3.4507 (19) | 152 |
O1WX—H2WX···Cg2vi | 0.86 | 2.89 | 3.402 (7) | 120 |
Symmetry codes: (i) −x, −y, −z+1; (ii) x+1, y, z−1; (iii) x−1, y−1, z+1; (iv) −x, −y+1, −z+1; (v) x+1, y, z; (vi) −x+1, −y+1, −z+1. |
Acknowledgements
NJ, WKC and MK wish to acknowledge the research grant RU1001/PKIMIA/811187 provided by Universiti Sains Malaysia (USM). NJ also thanks USM and the Third World Academy of Sciences (TWAS) for the award of a TWAS-USM PG fellowship. The authors also thank USM for the Research University Grant No. 1001/PFIZIK/811160.
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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.
Garcinia is traditionally used for the treatment of abdominal pain, dysentery, diarrhea, suppuration, infected wounds, leucorrhoea, chronic ulcers and gonorrhea (Jayaprakasha et al., 2006). Most Garcinia species are trees but some are shrubs or treelets and are rich sources of bioactive compounds including xanthones, flavonoids, benzophenones, lactones and phenolic acids (Mahabusarakum et al., 1983; Ngoupayo et al., 2009; Pereira et al., 2010; Phongpaichit et al., 1994; Zadernowski et al., 2009; Zhang et al., 2010). Garcinia hombroniana Pierre (Guttiferae), commonly called seashore mangosteen or pokok bruas (Malay), is indigenous in Malaysia and widely distributed in the southern part of Thailand where it is known as "wa" (Smitinand, 2001). During the course of our investigation of G. hombroniana, we have isolated the title benzophenone compound (I) from the ethyl acetate extract of the bark. Benzophenones have been found to possess antioxidant (Tzanova et al., 2009), anti-inflammatory (Khanum et al., 2009) and leishmanicidal (Pereira et al., 2010) activities.
The molecule of the title benzophenone which crystallized as a monohydrate (Fig. 1) is twisted with the dihedral angle between the 2,4-dihydroxy-6-methoxyphenyl and 3,5-dihydroxyphenyl rings being 59.13 (7)°, whereas the triangular Caryl-C(═O)-Caryl fragment (C1/C7/C8/O1) makes dihedral angles of 25.16 (7) and 43.44 (8)° with the 2,4-dihydroxy-6-methoxyphenyl and 3,5-dihydroxyphenyl rings, respectively. The two hydroxy groups and the methoxy groups of the 2,4-dihydroxy-6-methoxyphenyl residue are co-planar with the benzene ring with a r.m.s. of 0.0459 (1) Å for the ten non-H atoms and the torsion angle C14–O1–C6–C5 = 1.91 (18)°. The two hydroxy groups of the 3,5-dihydroxyphenyl are also co-planar with the r.m.s. of 0.0083 (1) Å for the eight non-H atoms. An intramolecular O2—H1O2···O1 hydrogen bond generates a S(6) ring motif (Bernstein et al., 1995) (Fig. 1 and Table 1). The bond distances are comparable with the related structures (Betz et al., 2011; Li et al., 2010). The water molecule is disordered over two positions in a 0.555 (19):0.445 (19) ratio.
The crystal is stabilized by intermolecular O—H···O hydrogen bonds. These interactions link the molecules into sheets parallel to the ac plane (Fig. 2). These sheets are stacked along the b axis by π···π interaction with the Cg1···Cg1 distance of 3.6219 (7) Å (symmetry code 1-x, -y, 1-z) where Cg1 is the centroid of the C1–C6 benzene ring. A weak O—H···π interaction was also observed (Table 1).