Helical catena-poly[[tris(1H-benzimidazole-κN³)cobalt(II)]-μ-maleato-κ³O,O′:O′′]

The crystal structure of the title compound, [Co(C₄H₂O₄)(C₇H₆N₂)₃]_n, consists of polymeric chains of the Co^II complex. Two maleate dianions and three benz­imidazole ligands coordinate to the Co^II atom with a distorted octahedral geometry. The maleate dianions bridge neighbouring Co^II atoms via both terminal carboxylic acid groups, one of which is monodentate and the other bidentate, to form a helical structure of alternating maleate dianions and Co^II atoms, with a pitch height of 9.2667 (17) Å. The absolute structure has been determined, and the crystal contains only right-handed helices. Intrahelical N—H...O hydrogen bonds stabilize the helical structure, while interhelical N—H...O hydrogen bonds link neighbouring helices to form the supramolecular structure.

S1. Comment

Helical metal complexes have received much attention in coordination chemistry and material science (Munakata et al., 1999) and much effort has been devoted to the preparation of helical complexes by careful design of ligands (Erxleben, 2001; Ezuhara et al., 1999). Dicarboxylates have been shown to be potential helicating ligands when their terminal carboxylic acid groups are twisted by an appropriate angle with respect to each other (Hu et al., 2001). As part of a series of studies of helical metal complexes, we present here the structure of the title complex, (I), a polymeric Co^II complex bridged by a maleate dianion. \sch

The coordination environment around the Co^II atom in (I) is illustrated in Fig. 1. Two carboxyl groups from maleate dianions, related by a twofold screw axis, coordinate to the Co^II atom in the equatorial coordination plane. The O1,O2 carboxyl group coordinates monodentately, while the O3ⁱ,O4ⁱ carboxyl group chelates to the Co^II atom in a bidentate fashion [symmetry code (i): x − 1/2, 1/2 − y, −z]. Atoms O1, O3ⁱ, O4ⁱ and Co are essentially coplanar, with a maximum atomic deviation of 0.0401 (12) Å (Co), but atom O2 is out of this mean plane by 1.120 (4) Å. Thus, the O1,O2 and O3,O4 carboxyl groups are twisted with respect to each other by a dihedral angle of 34.6 (4)°. Three benzimidazole molecules coordinate to the Co^II atom to complete the distorted octahedral coordination geometry (Table 1), with the N21 benzimidazole located in the equatorial plane, while the N11 and N31 benzimizadoles are in the axial direction. The distortion of the octahedron is manifested by the larger coordinate bond angles in the equatorial plane, with O1—Co—N23 114.27 (11)° and N23—Co—O3ⁱ 99.82 (10)°. This is due to weak C22—H22···O2 and C24—H24···O3ⁱ hydrogen bonding (Fig. 1 and Table 2).

With the aid of both terminal carboxyl groups, the maleate dianion bridges adjacent Co^II atoms related by a twofold screw axis. This results in a helical polymeric molecular chain of alternating maleate dianions and Co^II atoms, extending along the a axis (Fig. 2). The helix has a pitch height of 9.2667 (17) Å and the repeat unit of the helix backbone includes two Co^II atoms and two maleate dianions. In the same helix, the adjacent equatorial coordination planes are inclined towards each other, with a dihedral angle of 59.00 (7)°. A search of the Cambridge Crystallographic Database indicates that this is the first helical metal complex with maleate as the helicating ligand (Allen, 2002).

The absolute structure of (I) was determined, and the crystal contains only right-handed helices. At present, we do not understand whether the opposite enantiomer was simultaneously generated in the preparation process, with conglomerate crystallization.

Besides the weak C—H···O hydrogen bonding mentioned above, a classical hydrogen-bonding network occurs in the crystal of (I). Within the same helix, N—H···O hydrogen bonds between the carboxylate and the axial benzimidazole stabilize the helical structure. Neighbouring helices link to each other via N—H···O hydrogen bonds between the equatorial benzimidazole ligand and the carboxylate group of the adjacent helix, to form the supramolecular structure shown in Fig. 2. The hydrogen-bonding parameters are listed in Table 2.

S2. Experimental

An aqueous solution (5 ml) containing maleic acid (0.23 g, 2 mmol) and sodium carbonate (0.21 g, 2 mmol) was mixed with an aqueous solution (5 ml) of CoCl₂·6H₂O (0.48 g, 2 mmol). After refluxing the solution for 30 min, an ethanol solution (5 ml) of benzimidazole (0.47 g, 4 mmol) was added dropwise to the aqueous solution. The mixture was refluxed for a further 2 h and then filtered. The filtrate was kept at room temperature and pink single crystals of (I) were obtained after 5 d.

S3. Refinement

H atoms were placed in calculated positions, with C—H = 0.93 Å and N—H = 0.86 Å, and were included in the final cycles of refinement in a riding model, with U_iso(H) = 1.2U_eq of the carrier atom.

Computing details

Data collection: PROCESS-AUTO (Rigaku, 1998); cell refinement: PROCESS-AUTO; data reduction: CrystalStructure (Molecular Structure Corporation & Rigaku Corporation, 2002); program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and XP (Siemens, 1994); software used to prepare material for publication: WinGX (Farrugia, 1999).

Figures

	Fig. 1. The coordination environment around the Co^II atom in (I) with 30% probability displacement ellipsoids [symmetry code (i): x − 1/2, 1/2 − y, −z].
	Fig. 2. The molecular packing diagram for (I). Dashed lines indicate the hydrogen bonding and H atoms have been omitted for clarity.

catena-Poly[[tris(1H-benzimidazole-κN³)cobalt(II)]-µ-maleato-κ³O,O':O'']

Crystal data

[Co(C4H2O4)(C7H6N2)3]	F(000) = 1084
Mr = 527.40	Dx = 1.477 Mg m^−3
Orthorhombic, P212121	Mo Kα radiation, λ = 0.71069 Å
Hall symbol: P 2ac 2ab	Cell parameters from 21868 reflections
a = 9.2667 (17) Å	θ = 1.7–27.4°
b = 12.1242 (15) Å	µ = 0.77 mm^−1
c = 21.099 (19) Å	T = 298 K
V = 2371 (2) Å^3	Prism, pink
Z = 4	0.29 × 0.19 × 0.11 mm

Data collection

Rigaku R-AXIS Rapid diffractometer	5413 independent reflections
Radiation source: fine-focus sealed tube	4569 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.051
Detector resolution: 10.00 pixels mm^-1	θmax = 27.5°, θmin = 1.9°
ω scans	h = −12→10
Absorption correction: multi-scan (ABSCOR; Higashi, 1995)	k = −15→15
Tmin = 0.788, Tmax = 0.922	l = −25→27
22026 measured reflections

Refinement

Refinement on F^2	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F^2 > 2σ(F^2)] = 0.041	H-atom parameters constrained
wR(F^2) = 0.114	w = 1/[σ^2(Fo^2) + (0.0706P)^2 + 0.0433P] where P = (Fo^2 + 2Fc^2)/3
S = 1.09	(Δ/σ)max = 0.001
5413 reflections	Δρmax = 0.35 e Å^−3
325 parameters	Δρmin = −0.59 e Å^−3
0 restraints	Absolute structure: Flack (1983), 2338 Friedel pairs
Primary atom site location: structure-invariant direct methods	Absolute structure parameter: 0.019 (16)

Special details

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
Co	0.47553 (4)	0.27408 (3)	0.112641 (18)	0.03299 (12)
O1	0.5592 (2)	0.37952 (19)	0.04278 (10)	0.0396 (5)
O2	0.7496 (3)	0.4364 (2)	0.09848 (10)	0.0491 (6)
O3	0.8609 (3)	0.3841 (2)	−0.13193 (10)	0.0408 (5)
O4	0.8843 (2)	0.33189 (19)	−0.03307 (10)	0.0403 (5)
N11	0.8640 (3)	0.1152 (2)	0.06410 (13)	0.0459 (7)
H11	0.9237	0.0983	0.0344	0.055*
N13	0.6678 (3)	0.1819 (2)	0.11031 (13)	0.0389 (6)
N21	0.5567 (3)	0.4430 (3)	0.28687 (13)	0.0477 (7)
H21	0.6013	0.4935	0.3077	0.057*
N23	0.4956 (3)	0.3350 (2)	0.20653 (11)	0.0402 (6)
N31	0.0464 (3)	0.3993 (2)	0.09310 (14)	0.0452 (7)
H31	−0.0449	0.3868	0.0910	0.054*
N33	0.2794 (3)	0.3674 (2)	0.10667 (13)	0.0383 (6)
C1	0.6727 (3)	0.4370 (3)	0.05116 (14)	0.0335 (6)
C2	0.7031 (4)	0.5207 (3)	0.00014 (15)	0.0391 (7)
H2	0.6643	0.5906	0.0066	0.047*
C3	0.7781 (4)	0.5075 (3)	−0.05283 (16)	0.0376 (7)
H3	0.7896	0.5685	−0.0791	0.045*
C4	0.8450 (3)	0.4018 (3)	−0.07299 (14)	0.0325 (6)
C12	0.7391 (4)	0.1671 (3)	0.05724 (15)	0.0408 (7)
H12	0.7049	0.1910	0.0181	0.049*
C14	0.7376 (5)	0.1277 (4)	0.22220 (17)	0.0589 (11)
H14	0.6566	0.1564	0.2423	0.071*
C15	0.8449 (6)	0.0754 (5)	0.2556 (2)	0.0826 (16)
H15	0.8358	0.0691	0.2993	0.099*
C16	0.9660 (5)	0.0319 (5)	0.2265 (2)	0.0847 (17)
H16	1.0349	−0.0038	0.2511	0.102*
C17	0.9870 (4)	0.0399 (4)	0.1626 (2)	0.0644 (11)
H17	1.0687	0.0110	0.1431	0.077*
C18	0.8803 (4)	0.0934 (3)	0.12806 (16)	0.0422 (8)
C19	0.7562 (4)	0.1357 (3)	0.15640 (15)	0.0403 (7)
C22	0.5805 (4)	0.4137 (3)	0.22590 (15)	0.0447 (8)
H22	0.6504	0.4464	0.2004	0.054*
C24	0.2983 (4)	0.2336 (4)	0.26540 (17)	0.0565 (10)
H24	0.2701	0.1887	0.2319	0.068*
C25	0.2316 (5)	0.2272 (4)	0.32345 (19)	0.0718 (13)
H25	0.1574	0.1765	0.3292	0.086*
C26	0.2720 (5)	0.2946 (4)	0.37396 (19)	0.0703 (13)
H26	0.2245	0.2874	0.4126	0.084*
C27	0.3801 (4)	0.3712 (3)	0.36810 (17)	0.0518 (9)
H27	0.4068	0.4168	0.4015	0.062*
C28	0.4476 (4)	0.3767 (3)	0.30915 (15)	0.0416 (8)
C29	0.4088 (4)	0.3092 (3)	0.25871 (14)	0.0396 (7)
C32	0.1485 (3)	0.3258 (3)	0.10643 (16)	0.0415 (7)
H32	0.1292	0.2519	0.1148	0.050*
C34	0.3578 (4)	0.5656 (3)	0.0915 (2)	0.0549 (10)
H34	0.4556	0.5541	0.0987	0.066*
C35	0.3046 (5)	0.6689 (4)	0.0785 (3)	0.0731 (14)
H35	0.3678	0.7285	0.0775	0.088*
C36	0.1584 (6)	0.6869 (4)	0.0670 (3)	0.0764 (14)
H36	0.1270	0.7579	0.0576	0.092*
C37	0.0604 (5)	0.6034 (3)	0.0691 (2)	0.0594 (11)
H37	−0.0371	0.6157	0.0614	0.071*
C38	0.1132 (4)	0.4986 (3)	0.08331 (15)	0.0426 (8)
C39	0.2599 (4)	0.4791 (3)	0.09322 (15)	0.0381 (7)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Co	0.0368 (2)	0.0344 (2)	0.02779 (17)	−0.00136 (17)	0.00068 (17)	−0.00090 (17)
O1	0.0351 (12)	0.0424 (13)	0.0411 (12)	−0.0019 (9)	0.0010 (10)	0.0064 (9)
O2	0.0414 (12)	0.0707 (18)	0.0352 (12)	−0.0090 (12)	0.0010 (10)	−0.0053 (11)
O3	0.0499 (13)	0.0426 (13)	0.0300 (10)	0.0005 (10)	0.0026 (10)	−0.0008 (9)
O4	0.0464 (13)	0.0383 (12)	0.0363 (11)	0.0043 (10)	0.0037 (10)	0.0054 (10)
N11	0.0479 (18)	0.0520 (18)	0.0379 (14)	0.0084 (13)	0.0086 (13)	0.0032 (13)
N13	0.0456 (14)	0.0407 (14)	0.0303 (12)	0.0035 (11)	−0.0017 (13)	0.0018 (12)
N21	0.0504 (17)	0.0568 (19)	0.0358 (13)	−0.0090 (14)	−0.0036 (13)	−0.0123 (13)
N23	0.0416 (15)	0.0463 (15)	0.0326 (12)	−0.0021 (12)	0.0004 (12)	−0.0069 (11)
N31	0.0342 (14)	0.0489 (17)	0.0526 (16)	−0.0001 (12)	−0.0065 (13)	−0.0036 (13)
N33	0.0382 (14)	0.0381 (14)	0.0386 (14)	0.0001 (11)	0.0021 (13)	−0.0039 (12)
C1	0.0327 (15)	0.0344 (16)	0.0334 (15)	0.0005 (13)	0.0082 (13)	−0.0042 (12)
C2	0.0427 (18)	0.0300 (17)	0.0447 (18)	0.0006 (13)	0.0048 (15)	−0.0017 (13)
C3	0.0436 (18)	0.0262 (15)	0.0431 (17)	−0.0038 (13)	0.0056 (15)	0.0026 (13)
C4	0.0339 (15)	0.0309 (16)	0.0327 (14)	−0.0034 (12)	0.0036 (13)	0.0008 (12)
C12	0.052 (2)	0.0412 (18)	0.0288 (14)	0.0061 (16)	0.0030 (14)	0.0019 (13)
C14	0.052 (2)	0.090 (3)	0.0341 (17)	0.003 (2)	0.0026 (17)	0.0139 (19)
C15	0.073 (3)	0.133 (5)	0.042 (2)	0.008 (3)	−0.005 (2)	0.032 (3)
C16	0.055 (3)	0.136 (5)	0.064 (3)	0.020 (3)	−0.006 (2)	0.041 (3)
C17	0.042 (2)	0.089 (3)	0.062 (2)	0.010 (2)	0.0055 (19)	0.019 (2)
C18	0.0381 (17)	0.050 (2)	0.0390 (17)	−0.0042 (14)	0.0011 (14)	0.0078 (14)
C19	0.0403 (17)	0.047 (2)	0.0338 (15)	−0.0048 (15)	0.0015 (14)	0.0053 (14)
C22	0.0451 (18)	0.056 (2)	0.0327 (15)	−0.0115 (16)	0.0018 (14)	−0.0022 (15)
C24	0.064 (2)	0.060 (2)	0.0450 (18)	−0.018 (2)	0.0102 (17)	−0.0120 (18)
C25	0.080 (3)	0.075 (3)	0.060 (2)	−0.030 (3)	0.020 (2)	−0.010 (2)
C26	0.086 (3)	0.083 (3)	0.0415 (19)	−0.006 (3)	0.024 (2)	−0.006 (2)
C27	0.066 (2)	0.057 (2)	0.0328 (16)	−0.0015 (19)	0.0040 (17)	−0.0058 (15)
C28	0.046 (2)	0.0456 (19)	0.0334 (15)	−0.0008 (15)	−0.0023 (14)	−0.0026 (13)
C29	0.0459 (17)	0.0410 (18)	0.0319 (15)	0.0033 (14)	0.0011 (14)	−0.0035 (13)
C32	0.0389 (15)	0.0403 (17)	0.0453 (18)	−0.0037 (13)	0.0001 (15)	−0.0018 (15)
C34	0.049 (2)	0.041 (2)	0.075 (3)	−0.0045 (17)	0.0129 (19)	−0.0123 (18)
C35	0.075 (3)	0.038 (2)	0.106 (4)	−0.006 (2)	0.023 (3)	−0.001 (2)
C36	0.089 (3)	0.046 (2)	0.094 (4)	0.009 (2)	0.003 (3)	0.013 (2)
C37	0.062 (3)	0.055 (2)	0.060 (2)	0.0176 (19)	−0.006 (2)	0.0026 (19)
C38	0.049 (2)	0.0460 (19)	0.0326 (15)	0.0048 (15)	−0.0031 (15)	−0.0044 (14)
C39	0.0423 (17)	0.0401 (18)	0.0318 (14)	0.0012 (14)	0.0049 (13)	−0.0070 (13)

Geometric parameters (Å, º)

Co—O1	2.100 (2)	C14—C19	1.402 (5)
Co—N13	2.104 (3)	C14—H14	0.93
Co—N23	2.122 (3)	C15—C16	1.383 (7)
Co—N33	2.145 (3)	C15—H15	0.93
Co—O3^i	2.230 (2)	C16—C17	1.366 (6)
Co—O4^i	2.277 (2)	C16—H16	0.93
O1—C1	1.274 (4)	C17—C18	1.388 (5)
O2—C1	1.226 (4)	C17—H17	0.93
O3—C4	1.270 (4)	C18—C19	1.394 (5)
O4—C4	1.250 (4)	C22—H22	0.93
N11—C12	1.325 (5)	C24—C25	1.374 (5)
N11—C18	1.383 (5)	C24—C29	1.382 (5)
N11—H11	0.86	C24—H24	0.93
N13—C12	1.313 (4)	C25—C26	1.394 (6)
N13—C19	1.390 (4)	C25—H25	0.93
N21—C22	1.353 (4)	C26—C27	1.371 (6)
N21—C28	1.374 (4)	C26—H26	0.93
N21—H21	0.86	C27—C28	1.394 (5)
N23—C22	1.303 (4)	C27—H27	0.93
N23—C29	1.399 (4)	C28—C29	1.390 (5)
N31—C32	1.331 (4)	C32—H32	0.93
N31—C38	1.370 (5)	C34—C35	1.374 (6)
N31—H31	0.86	C34—C39	1.387 (5)
N33—C32	1.314 (4)	C34—H34	0.93
N33—C39	1.395 (4)	C35—C36	1.393 (7)
C1—C2	1.506 (4)	C35—H35	0.93
C2—C3	1.326 (5)	C36—C37	1.361 (7)
C2—H2	0.93	C36—H36	0.93
C3—C4	1.486 (4)	C37—C38	1.394 (5)
C3—H3	0.93	C37—H37	0.93
C12—H12	0.93	C38—C39	1.396 (5)
C14—C15	1.373 (6)
O1—Co—N13	89.66 (10)	C16—C15—H15	118.8
O1—Co—N23	114.27 (11)	C17—C16—C15	121.7 (4)
N13—Co—N23	97.60 (11)	C17—C16—H16	119.1
O1—Co—N33	87.16 (10)	C15—C16—H16	119.1
N13—Co—N33	175.29 (11)	C16—C17—C18	116.7 (4)
N23—Co—N33	86.88 (11)	C16—C17—H17	121.6
O1—Co—O3^i	145.87 (9)	C18—C17—H17	121.6
N13—Co—O3^i	87.21 (10)	C17—C18—N11	132.7 (3)
N23—Co—O3^i	99.82 (10)	C17—C18—C19	122.3 (3)
N33—Co—O3^i	93.49 (9)	N11—C18—C19	104.9 (3)
O1—Co—O4^i	87.88 (10)	N13—C19—C18	109.6 (3)
N13—Co—O4^i	89.86 (10)	N13—C19—C14	130.4 (3)
N23—Co—O4^i	156.52 (9)	C18—C19—C14	120.0 (3)
N33—Co—O4^i	86.56 (10)	N23—C22—N21	113.1 (3)
O3^i—Co—O4^i	58.16 (9)	N23—C22—H22	123.5
C1—O1—Co	122.7 (2)	N21—C22—H22	123.5
C4—O3—Co^ii	91.26 (19)	C25—C24—C29	117.5 (4)
C4—O4—Co^ii	89.66 (18)	C25—C24—H24	121.2
C12—N11—C18	107.0 (3)	C29—C24—H24	121.2
C12—N11—H11	126.5	C24—C25—C26	121.8 (4)
C18—N11—H11	126.5	C24—C25—H25	119.1
C12—N13—C19	104.2 (3)	C26—C25—H25	119.1
C12—N13—Co	121.3 (2)	C27—C26—C25	121.6 (4)
C19—N13—Co	134.2 (2)	C27—C26—H26	119.2
C22—N21—C28	107.0 (3)	C25—C26—H26	119.2
C22—N21—H21	126.5	C26—C27—C28	116.1 (3)
C28—N21—H21	126.5	C26—C27—H27	121.9
C22—N23—C29	105.3 (3)	C28—C27—H27	121.9
C22—N23—Co	126.9 (2)	N21—C28—C29	105.8 (3)
C29—N23—Co	127.3 (2)	N21—C28—C27	131.6 (3)
C32—N31—C38	107.4 (3)	C29—C28—C27	122.6 (3)
C32—N31—H31	126.3	C24—C29—C28	120.3 (3)
C38—N31—H31	126.3	C24—C29—N23	130.9 (3)
C32—N33—C39	104.6 (3)	C28—C29—N23	108.8 (3)
C32—N33—Co	125.4 (2)	N33—C32—N31	113.6 (3)
C39—N33—Co	129.3 (2)	N33—C32—H32	123.2
O2—C1—O1	126.1 (3)	N31—C32—H32	123.2
O2—C1—C2	118.5 (3)	C35—C34—C39	117.4 (4)
O1—C1—C2	115.1 (3)	C35—C34—H34	121.3
C3—C2—C1	128.3 (3)	C39—C34—H34	121.3
C3—C2—H2	115.9	C34—C35—C36	121.8 (4)
C1—C2—H2	115.9	C34—C35—H35	119.1
C2—C3—C4	124.3 (3)	C36—C35—H35	119.1
C2—C3—H3	117.8	C37—C36—C35	121.8 (4)
C4—C3—H3	117.8	C37—C36—H36	119.1
O4—C4—O3	120.7 (3)	C35—C36—H36	119.1
O4—C4—C3	120.9 (3)	C36—C37—C38	116.8 (4)
O3—C4—C3	118.3 (3)	C36—C37—H37	121.6
N13—C12—N11	114.3 (3)	C38—C37—H37	121.6
N13—C12—H12	122.9	N31—C38—C39	105.6 (3)
N11—C12—H12	122.9	N31—C38—C37	132.5 (4)
C15—C14—C19	116.8 (4)	C39—C38—C37	121.9 (4)
C15—C14—H14	121.6	C34—C39—N33	130.9 (3)
C19—C14—H14	121.6	C34—C39—C38	120.3 (3)
C14—C15—C16	122.4 (4)	N33—C39—C38	108.7 (3)
C14—C15—H15	118.8

Symmetry codes: (i) x−1/2, −y+1/2, −z; (ii) x+1/2, −y+1/2, −z.

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N11—H11···O1^ii	0.86	2.07	2.892 (4)	158
N21—H21···O3^iii	0.86	1.99	2.813 (5)	161
N31—H31···O2^iv	0.86	2.00	2.789 (5)	151
C22—H22···O2	0.93	2.34	3.124 (5)	141
C24—H24···O3^i	0.93	2.44	3.210 (5)	141

Symmetry codes: (i) x−1/2, −y+1/2, −z; (ii) x+1/2, −y+1/2, −z; (iii) −x+3/2, −y+1, z+1/2; (iv) x−1, y, z.