organic compounds
4-[(4-Chlorophenyl)(hydroxy)methylidene]isochromane-1,3-dione
aLaboratoire de Cristallographie et Physique Moléculaire, UFR SSMT, Université de Cocody 22 BP 582 Abidjan 22, Côte d'Ivoire, and bLaboratoire de Chimie Bio-organique et Phytochimie, Université de Ouagadougou 03 BP 7021 Ouagadougou 03, Burkina Faso
*Correspondence e-mail: abou_akoun@yahoo.fr
In the title compound, C16H9ClO4, the six-membered heterocyclic ring adopts a screw-boat conformation. The benzene rings are oriented to each other at a dihedral angle of 59.26 (9)°. The molecular structure exhibits a ring motif, viz. S(6), owing to an intramolecular O—H⋯O hydrogen bond. The presence of C—H⋯O contacts generates an infinite chain along [001]. Also present are π–π stacking interactions between neighbouring isochromanedione benzene rings [centroid–centroid distance = 3.746 (1) Å], and C—O⋯π interactions [O⋯centroid = 3.934 (2) Å].
Related literature
For the biological activity of isochromanones, see: Bianchi et al. (2004); Buntin et al. (2008). For π–π stacking interactions, see: Janiak (2000). For hydrogen-bond motifs, see: Bernstein et al. (1995). For puckering parameters, see: Cremer & Pople (1975).
Experimental
Crystal data
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Data collection
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Refinement
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Data collection: COLLECT (Nonius, 2001); cell DENZO/SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO/SCALEPACK; program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97, publCIF (Westrip, 2010) and WinGX (Farrugia, 1999).
Supporting information
https://doi.org/10.1107/S160053681104829X/tk5016sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S160053681104829X/tk5016Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S160053681104829X/tk5016Isup3.cml
To a solution of 4-chlorobenzoyl chloride (4.10 -2 mol) in dry tetrahydrofuran (150 ml ), was added dried triethylamine (0.12 mol) and homophthalic anhydride (4.10 -2 mol) in small portions over 30 min. The mixture was then refluxed for 3 h and poured in 300 ml of chloroform. The solution was acidified with dilute hydrochloric acid until the pH was 2 - 3. The organic layer was extracted, washed with water, dried over MgSO4 and the solvent removed. The crude product was recrystallized from a chloroform-hexane (1/1, v/v) mixture. Yellow crystals were obtained in a good yield: 90%; M.pt. 432–433 K.
H atoms were placed in calculated positions (O—H = 0.82 Å and C—H = 0.93 Å) and refined using a riding model approximation with Uiso(H) constrained to 1.2 (aromatic) or 1.5 (O—H) times Ueq of the respective parent atom.
The title molecule is related to isochromanone derivatives that are generally known as regulators of plant growth (Bianchi et al., 2004). Depending on their chemical structure and concentration they can act either as inhibitors or stimulators of these processes. Some substituted isochromanones isolated from myxobacteria strains were introduced as anti-fungal agents (Buntin et al., 2008).
The structure of the title compound (I) (Fig. 1) consists of two planar benzene rings with the maximum deviations from the best planes of 0.035 (2) Å for atom C1 (benzene ring C1—C6) and ±0.007 (2) Å for atoms C15 and C16 (benzene ring C15—C20). An S(6) ring motif (Bernstein et al., 1995), arises from an intramolecular O—H···O hydrogen bond to generate a planar pseudo six-membered ring (maximum deviation from planarity being 0.059 (2) Å for atom C13) to result in a tricyclic ring system (Fig. 1). The dihedral angles between two benzene rings is 59.26 (9) and that between the pseudo six-membered ring and benzene ring C1—C6 is 13.65 (9) °. The heterocyclic ring C1/C6/C7/O8/C9/C10 adopts a screw-boat conformation as judged from the puckering parameters (Cremer & Pople, 1975): Q = 0.0952 (19) Å, θ = 67.5 (11)° and φ = 228.4 (12)°. Furthermore, intermolecular C—H···O contacts (Table 1) link molecules into infinite chains through along [001] (Fig. 2).
The supramolecular aggregation is completed by the presence of C—O···π interactions (O12···Cg3[x,1/2 - y,-1/2 + z] = 3.934 (2) Å, C9—O12···Cg3 = 83.48 (12)°, where Cg3 is the centroid of the benzene ring C15—C20, and π–π stacking between two parallel isochromanedione-benzene C1—C6 rings; in the latter, the centroid···centroid distance, (Cg2···Cg2 (-x,-y,-z) of 3.746 (1) Å), is less than 3.8 Å, the maximum regarded as relevant for π–π interactions (Janiak, 2000) (Fig.3).
For the biological activity of isochromanone, see: Bianchi et al. (2004); Buntin et al. (2008). For π–π stacking interactions, see: Janiak (2000). For hydrogen-bond motifs, see: Bernstein et al. (1995). For puckering parameters, see: Cremer & Pople (1975).
Data collection: COLLECT (Nonius, 2001); cell
DENZO/SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO/SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008), publCIF (Westrip, 2010) and WinGX (Farrugia, 1999).C16H9ClO4 | F(000) = 616 |
Mr = 300.68 | Dx = 1.533 Mg m−3 |
Monoclinic, P21/c | Melting point = 432–433 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 15.4973 (4) Å | Cell parameters from 12213 reflections |
b = 5.9631 (1) Å | θ = 1.4–29.0° |
c = 14.4526 (3) Å | µ = 0.31 mm−1 |
β = 102.661 (1)° | T = 298 K |
V = 1303.12 (5) Å3 | Prism, yellow |
Z = 4 | 0.40 × 0.30 × 0.20 mm |
Nonius KappaCCD diffractometer | 2693 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.037 |
Graphite monochromator | θmax = 29.0°, θmin = 1.4° |
φ and ω scans | h = −20→20 |
12213 measured reflections | k = −7→7 |
3248 independent reflections | l = −19→19 |
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)] = 0.053 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.163 | H-atom parameters constrained |
S = 1.08 | w = 1/[σ2(Fo2) + (0.085P)2 + 0.4082P] where P = (Fo2 + 2Fc2)/3 |
3248 reflections | (Δ/σ)max < 0.001 |
191 parameters | Δρmax = 0.25 e Å−3 |
0 restraints | Δρmin = −0.31 e Å−3 |
36 constraints |
C16H9ClO4 | V = 1303.12 (5) Å3 |
Mr = 300.68 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 15.4973 (4) Å | µ = 0.31 mm−1 |
b = 5.9631 (1) Å | T = 298 K |
c = 14.4526 (3) Å | 0.40 × 0.30 × 0.20 mm |
β = 102.661 (1)° |
Nonius KappaCCD diffractometer | 2693 reflections with I > 2σ(I) |
12213 measured reflections | Rint = 0.037 |
3248 independent reflections |
R[F2 > 2σ(F2)] = 0.053 | 0 restraints |
wR(F2) = 0.163 | H-atom parameters constrained |
S = 1.08 | Δρmax = 0.25 e Å−3 |
3248 reflections | Δρmin = −0.31 e Å−3 |
191 parameters |
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 > 2σ(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 | ||
Cl21 | 0.46136 (4) | 0.22385 (12) | 0.41605 (4) | 0.0768 (3) | |
O8 | 0.15001 (11) | 0.2734 (3) | −0.20791 (9) | 0.0600 (4) | |
C1 | 0.16846 (10) | 0.1431 (3) | −0.01749 (10) | 0.0355 (3) | |
C6 | 0.11986 (11) | 0.0094 (3) | −0.09040 (10) | 0.0412 (4) | |
O12 | 0.22812 (11) | 0.5783 (3) | −0.16990 (11) | 0.0688 (5) | |
C2 | 0.16289 (11) | 0.0881 (3) | 0.07551 (10) | 0.0391 (4) | |
H2 | 0.1898 | 0.1804 | 0.1254 | 0.047* | |
C10 | 0.21737 (11) | 0.3377 (3) | −0.04175 (11) | 0.0401 (4) | |
O14 | 0.30865 (10) | 0.6583 (2) | −0.00417 (11) | 0.0631 (4) | |
H14 | 0.2881 | 0.6813 | −0.0606 | 0.095* | |
C7 | 0.11070 (14) | 0.0730 (3) | −0.18995 (12) | 0.0525 (5) | |
C13 | 0.27868 (11) | 0.4635 (3) | 0.02079 (13) | 0.0437 (4) | |
C19 | 0.40760 (12) | 0.1419 (3) | 0.22901 (14) | 0.0479 (4) | |
H19 | 0.4368 | 0.0053 | 0.2416 | 0.057* | |
O11 | 0.07046 (13) | −0.0255 (3) | −0.25801 (10) | 0.0769 (5) | |
C5 | 0.07423 (13) | −0.1807 (3) | −0.07083 (13) | 0.0507 (4) | |
H5 | 0.0429 | −0.2681 | −0.1203 | 0.061* | |
C4 | 0.07567 (13) | −0.2382 (3) | 0.02135 (15) | 0.0521 (5) | |
H4 | 0.0482 | −0.3690 | 0.0349 | 0.062* | |
C16 | 0.32267 (13) | 0.5515 (3) | 0.19262 (14) | 0.0504 (4) | |
H16 | 0.2949 | 0.6900 | 0.1802 | 0.060* | |
C15 | 0.32154 (11) | 0.4012 (3) | 0.11887 (12) | 0.0413 (4) | |
C20 | 0.36492 (12) | 0.1967 (3) | 0.13808 (13) | 0.0452 (4) | |
H20 | 0.3651 | 0.0961 | 0.0889 | 0.054* | |
C17 | 0.36473 (13) | 0.4967 (3) | 0.28416 (14) | 0.0547 (5) | |
H17 | 0.3648 | 0.5966 | 0.3336 | 0.066* | |
C3 | 0.11838 (12) | −0.1000 (3) | 0.09398 (12) | 0.0454 (4) | |
H3 | 0.1169 | −0.1350 | 0.1563 | 0.054* | |
C18 | 0.40658 (12) | 0.2924 (3) | 0.30156 (13) | 0.0484 (4) | |
C9 | 0.19987 (13) | 0.4065 (3) | −0.13974 (12) | 0.0499 (4) |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl21 | 0.0704 (4) | 0.1024 (5) | 0.0503 (3) | 0.0049 (3) | −0.0029 (3) | 0.0100 (3) |
O8 | 0.0778 (10) | 0.0730 (10) | 0.0291 (6) | 0.0145 (7) | 0.0118 (6) | 0.0079 (6) |
C1 | 0.0389 (7) | 0.0382 (8) | 0.0293 (7) | 0.0059 (6) | 0.0070 (6) | −0.0002 (5) |
C6 | 0.0459 (8) | 0.0452 (9) | 0.0303 (7) | 0.0107 (7) | 0.0032 (6) | −0.0060 (6) |
O12 | 0.0821 (11) | 0.0719 (10) | 0.0570 (8) | 0.0075 (8) | 0.0251 (7) | 0.0298 (7) |
C2 | 0.0427 (8) | 0.0448 (9) | 0.0290 (7) | −0.0061 (6) | 0.0059 (6) | −0.0030 (6) |
C10 | 0.0452 (8) | 0.0422 (8) | 0.0347 (7) | 0.0065 (6) | 0.0124 (6) | 0.0057 (6) |
O14 | 0.0663 (9) | 0.0489 (8) | 0.0720 (10) | −0.0103 (7) | 0.0107 (7) | 0.0188 (7) |
C7 | 0.0646 (11) | 0.0585 (11) | 0.0313 (8) | 0.0215 (9) | 0.0034 (7) | −0.0057 (7) |
C13 | 0.0444 (8) | 0.0379 (8) | 0.0508 (9) | 0.0024 (6) | 0.0147 (7) | 0.0074 (7) |
C19 | 0.0424 (8) | 0.0427 (9) | 0.0569 (10) | 0.0037 (7) | 0.0075 (7) | 0.0054 (7) |
O11 | 0.1078 (13) | 0.0786 (11) | 0.0337 (7) | 0.0195 (9) | −0.0076 (7) | −0.0149 (7) |
C5 | 0.0531 (10) | 0.0472 (10) | 0.0456 (9) | 0.0004 (8) | −0.0030 (7) | −0.0133 (7) |
C4 | 0.0534 (10) | 0.0446 (10) | 0.0550 (11) | −0.0112 (8) | 0.0052 (8) | −0.0023 (8) |
C16 | 0.0512 (10) | 0.0372 (9) | 0.0597 (11) | 0.0044 (7) | 0.0056 (8) | −0.0054 (7) |
C15 | 0.0384 (8) | 0.0365 (8) | 0.0483 (9) | −0.0032 (6) | 0.0081 (7) | 0.0014 (6) |
C20 | 0.0472 (9) | 0.0387 (9) | 0.0493 (9) | 0.0025 (7) | 0.0097 (7) | −0.0033 (7) |
C17 | 0.0549 (11) | 0.0544 (11) | 0.0523 (10) | 0.0022 (8) | 0.0068 (8) | −0.0133 (8) |
C3 | 0.0476 (9) | 0.0502 (10) | 0.0376 (8) | −0.0064 (7) | 0.0074 (7) | 0.0035 (7) |
C18 | 0.0384 (8) | 0.0576 (11) | 0.0473 (9) | −0.0039 (7) | 0.0054 (7) | 0.0028 (8) |
C9 | 0.0552 (10) | 0.0583 (11) | 0.0392 (8) | 0.0153 (8) | 0.0171 (7) | 0.0120 (7) |
Cl21—C18 | 1.7349 (19) | C13—C15 | 1.475 (2) |
O8—C9 | 1.365 (3) | C19—C20 | 1.375 (3) |
O8—C7 | 1.391 (3) | C19—C18 | 1.383 (3) |
C1—C6 | 1.402 (2) | C19—H19 | 0.9300 |
C1—C2 | 1.405 (2) | C5—C4 | 1.371 (3) |
C1—C10 | 1.469 (2) | C5—H5 | 0.9300 |
C6—C5 | 1.397 (3) | C4—C3 | 1.384 (3) |
C6—C7 | 1.465 (2) | C4—H4 | 0.9300 |
O12—C9 | 1.231 (2) | C16—C17 | 1.380 (3) |
C2—C3 | 1.373 (2) | C16—C15 | 1.390 (2) |
C2—H2 | 0.9300 | C16—H16 | 0.9300 |
C10—C13 | 1.381 (2) | C15—C20 | 1.390 (2) |
C10—C9 | 1.442 (2) | C20—H20 | 0.9300 |
O14—C13 | 1.330 (2) | C17—C18 | 1.377 (3) |
O14—H14 | 0.8200 | C17—H17 | 0.9300 |
C7—O11 | 1.197 (2) | C3—H3 | 0.9300 |
C9—O8—C7 | 124.50 (14) | C6—C5—H5 | 120.1 |
C6—C1—C2 | 116.77 (15) | C5—C4—C3 | 119.43 (17) |
C6—C1—C10 | 119.35 (14) | C5—C4—H4 | 120.3 |
C2—C1—C10 | 123.78 (14) | C3—C4—H4 | 120.3 |
C5—C6—C1 | 121.45 (15) | C17—C16—C15 | 120.40 (17) |
C5—C6—C7 | 117.68 (16) | C17—C16—H16 | 119.8 |
C1—C6—C7 | 120.75 (17) | C15—C16—H16 | 119.8 |
C3—C2—C1 | 121.06 (15) | C16—C15—C20 | 119.22 (16) |
C3—C2—H2 | 119.5 | C16—C15—C13 | 120.09 (16) |
C1—C2—H2 | 119.5 | C20—C15—C13 | 120.61 (16) |
C13—C10—C9 | 116.26 (16) | C19—C20—C15 | 120.63 (17) |
C13—C10—C1 | 126.15 (14) | C19—C20—H20 | 119.7 |
C9—C10—C1 | 117.58 (15) | C15—C20—H20 | 119.7 |
C13—O14—H14 | 109.5 | C18—C17—C16 | 119.31 (18) |
O11—C7—O8 | 116.02 (18) | C18—C17—H17 | 120.3 |
O11—C7—C6 | 127.0 (2) | C16—C17—H17 | 120.3 |
O8—C7—C6 | 116.98 (16) | C2—C3—C4 | 121.07 (16) |
O14—C13—C10 | 121.90 (16) | C2—C3—H3 | 119.5 |
O14—C13—C15 | 111.74 (16) | C4—C3—H3 | 119.5 |
C10—C13—C15 | 126.31 (15) | C17—C18—C19 | 121.25 (18) |
C20—C19—C18 | 119.17 (17) | C17—C18—Cl21 | 119.68 (16) |
C20—C19—H19 | 120.4 | C19—C18—Cl21 | 119.05 (15) |
C18—C19—H19 | 120.4 | O12—C9—O8 | 114.66 (16) |
C4—C5—C6 | 119.89 (16) | O12—C9—C10 | 125.43 (19) |
C4—C5—H5 | 120.1 | O8—C9—C10 | 119.89 (17) |
C2—C1—C6—C5 | −5.3 (2) | C17—C16—C15—C20 | −1.4 (3) |
C10—C1—C6—C5 | 178.26 (15) | C17—C16—C15—C13 | −178.23 (17) |
C2—C1—C6—C7 | 170.79 (15) | O14—C13—C15—C16 | 52.6 (2) |
C10—C1—C6—C7 | −5.7 (2) | C10—C13—C15—C16 | −129.9 (2) |
C6—C1—C2—C3 | 5.7 (2) | O14—C13—C15—C20 | −124.18 (18) |
C10—C1—C2—C3 | −177.98 (15) | C10—C13—C15—C20 | 53.3 (2) |
C6—C1—C10—C13 | −169.15 (16) | C18—C19—C20—C15 | 0.3 (3) |
C2—C1—C10—C13 | 14.6 (3) | C16—C15—C20—C19 | 0.8 (3) |
C6—C1—C10—C9 | 11.3 (2) | C13—C15—C20—C19 | 177.65 (16) |
C2—C1—C10—C9 | −164.88 (16) | C15—C16—C17—C18 | 0.8 (3) |
C9—O8—C7—O11 | −178.66 (18) | C1—C2—C3—C4 | −1.7 (3) |
C9—O8—C7—C6 | 3.6 (3) | C5—C4—C3—C2 | −3.1 (3) |
C5—C6—C7—O11 | −3.0 (3) | C16—C17—C18—C19 | 0.3 (3) |
C1—C6—C7—O11 | −179.20 (19) | C16—C17—C18—Cl21 | 178.84 (15) |
C5—C6—C7—O8 | 174.43 (15) | C20—C19—C18—C17 | −0.9 (3) |
C1—C6—C7—O8 | −1.8 (2) | C20—C19—C18—Cl21 | −179.41 (14) |
C9—C10—C13—O14 | 11.1 (3) | C7—O8—C9—O12 | −179.24 (16) |
C1—C10—C13—O14 | −168.40 (16) | C7—O8—C9—C10 | 2.3 (3) |
C9—C10—C13—C15 | −166.14 (16) | C13—C10—C9—O12 | −7.6 (3) |
C1—C10—C13—C15 | 14.3 (3) | C1—C10—C9—O12 | 172.00 (17) |
C1—C6—C5—C4 | 0.7 (3) | C13—C10—C9—O8 | 170.70 (16) |
C7—C6—C5—C4 | −175.45 (18) | C1—C10—C9—O8 | −9.7 (2) |
C6—C5—C4—C3 | 3.6 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
O14—H14···O12 | 0.82 | 1.76 | 2.492 (2) | 148 |
C3—H3···O11i | 0.93 | 2.56 | 3.288 (2) | 136 |
Symmetry code: (i) x, −y−1/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C16H9ClO4 |
Mr | 300.68 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 298 |
a, b, c (Å) | 15.4973 (4), 5.9631 (1), 14.4526 (3) |
β (°) | 102.661 (1) |
V (Å3) | 1303.12 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.31 |
Crystal size (mm) | 0.40 × 0.30 × 0.20 |
Data collection | |
Diffractometer | Nonius KappaCCD |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 12213, 3248, 2693 |
Rint | 0.037 |
(sin θ/λ)max (Å−1) | 0.683 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.053, 0.163, 1.08 |
No. of reflections | 3248 |
No. of parameters | 191 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.25, −0.31 |
Computer programs: COLLECT (Nonius, 2001), DENZO/SCALEPACK (Otwinowski & Minor, 1997), SIR92 (Altomare et al., 1994), PLATON (Spek, 2009), SHELXL97 (Sheldrick, 2008), publCIF (Westrip, 2010) and WinGX (Farrugia, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
O14—H14···O12 | 0.82 | 1.76 | 2.492 (2) | 148 |
C3—H3···O11i | 0.93 | 2.56 | 3.288 (2) | 136 |
Symmetry code: (i) x, −y−1/2, z+1/2. |
Acknowledgements
We thank the Laboratoire de Physique des Interactions Ioniques et Spectropôle, Université de Provence, and Université Paul Cézanne, Faculté des Sciences et Techniques de Saint Jérôme, Marseille, France, for the use of their facilities.
References
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The title molecule is related to isochromanone derivatives that are generally known as regulators of plant growth (Bianchi et al., 2004). Depending on their chemical structure and concentration they can act either as inhibitors or stimulators of these processes. Some substituted isochromanones isolated from myxobacteria strains were introduced as anti-fungal agents (Buntin et al., 2008).
The structure of the title compound (I) (Fig. 1) consists of two planar benzene rings with the maximum deviations from the best planes of 0.035 (2) Å for atom C1 (benzene ring C1—C6) and ±0.007 (2) Å for atoms C15 and C16 (benzene ring C15—C20). An S(6) ring motif (Bernstein et al., 1995), arises from an intramolecular O—H···O hydrogen bond to generate a planar pseudo six-membered ring (maximum deviation from planarity being 0.059 (2) Å for atom C13) to result in a tricyclic ring system (Fig. 1). The dihedral angles between two benzene rings is 59.26 (9) and that between the pseudo six-membered ring and benzene ring C1—C6 is 13.65 (9) °. The heterocyclic ring C1/C6/C7/O8/C9/C10 adopts a screw-boat conformation as judged from the puckering parameters (Cremer & Pople, 1975): Q = 0.0952 (19) Å, θ = 67.5 (11)° and φ = 228.4 (12)°. Furthermore, intermolecular C—H···O contacts (Table 1) link molecules into infinite chains through along [001] (Fig. 2).
The supramolecular aggregation is completed by the presence of C—O···π interactions (O12···Cg3[x,1/2 - y,-1/2 + z] = 3.934 (2) Å, C9—O12···Cg3 = 83.48 (12)°, where Cg3 is the centroid of the benzene ring C15—C20, and π–π stacking between two parallel isochromanedione-benzene C1—C6 rings; in the latter, the centroid···centroid distance, (Cg2···Cg2 (-x,-y,-z) of 3.746 (1) Å), is less than 3.8 Å, the maximum regarded as relevant for π–π interactions (Janiak, 2000) (Fig.3).