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The title molecule, C
18H
22O
4, lies on a crystallographic inversion center which is located at the center of the benzene ring. In the crystal structure, moleclues are linked by weak intermolecular C—H
O hydrogen bonds, forming a two-dimensional network perpendicular to the
a axis.
Supporting information
CCDC reference: 610845
Key indicators
- Single-crystal X-ray study
- T = 298 K
- Mean (C-C) = 0.004 Å
- R factor = 0.065
- wR factor = 0.157
- Data-to-parameter ratio = 16.4
checkCIF/PLATON results
No syntax errors found
Alert level C
PLAT066_ALERT_1_C Predicted and Reported Transmissions Identical . ?
PLAT242_ALERT_2_C Check Low Ueq as Compared to Neighbors for C4
0 ALERT level A = In general: serious problem
0 ALERT level B = Potentially serious problem
2 ALERT level C = Check and explain
0 ALERT level G = General alerts; check
1 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
1 ALERT type 2 Indicator that the structure model may be wrong or deficient
0 ALERT type 3 Indicator that the structure quality may be low
0 ALERT type 4 Improvement, methodology, query or suggestion
Data collection: SMART (Bruker, 1997); cell refinement: SAINT (Bruker, 1997); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Bruker, 2001); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2003).
3,3'-(
p-Phenylenedimethylene)bis(propane-2,4-dione)
top
Crystal data top
C18H22O4 | F(000) = 324 |
Mr = 302.36 | Dx = 1.222 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 627 reflections |
a = 13.959 (5) Å | θ = 3.1–20.6° |
b = 5.679 (2) Å | µ = 0.09 mm−1 |
c = 10.860 (4) Å | T = 298 K |
β = 107.386 (6)° | Prism, colorless |
V = 821.6 (5) Å3 | 0.30 × 0.21 × 0.12 mm |
Z = 2 | |
Data collection top
Bruker SMART APEX CCD diffractometer | 1669 independent reflections |
Radiation source: fine-focus sealed tube | 1189 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.038 |
φ and ω scans | θmax = 26.4°, θmin = 1.5° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −17→15 |
Tmin = 0.975, Tmax = 0.990 | k = −7→7 |
4365 measured reflections | l = −11→13 |
Refinement top
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)] = 0.065 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.157 | H-atom parameters constrained |
S = 1.08 | w = 1/[σ2(Fo2) + (0.0555P)2 + 0.239P] where P = (Fo2 + 2Fc2)/3 |
1669 reflections | (Δ/σ)max < 0.001 |
102 parameters | Δρmax = 0.22 e Å−3 |
0 restraints | Δρmin = −0.13 e Å−3 |
Special details top
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 (Å2) top | x | y | z | Uiso*/Ueq | |
C2 | 0.36175 (17) | 0.2014 (4) | 0.4927 (2) | 0.0392 (6) | |
C3 | 0.27058 (16) | 0.1295 (4) | 0.5331 (2) | 0.0362 (6) | |
H8 | 0.2684 | 0.2253 | 0.6073 | 0.043* | |
O1 | 0.30398 (18) | −0.2731 (3) | 0.50680 (19) | 0.0768 (7) | |
C4 | 0.28219 (16) | −0.1296 (4) | 0.5740 (2) | 0.0376 (6) | |
C7 | 0.08157 (17) | 0.0823 (5) | 0.4608 (2) | 0.0435 (6) | |
C6 | 0.04743 (19) | 0.2040 (5) | 0.5495 (3) | 0.0512 (7) | |
H4 | 0.0791 | 0.3435 | 0.5841 | 0.061* | |
C8 | 0.03242 (18) | −0.1240 (5) | 0.4118 (2) | 0.0504 (7) | |
H3 | 0.0535 | −0.2103 | 0.3518 | 0.060* | |
C9 | 0.17246 (17) | 0.1639 (5) | 0.4246 (2) | 0.0484 (7) | |
H2A | 0.1647 | 0.3295 | 0.4019 | 0.058* | |
H1B | 0.1761 | 0.0775 | 0.3491 | 0.058* | |
C1 | 0.45682 (18) | 0.2425 (5) | 0.5994 (3) | 0.0597 (8) | |
H11A | 0.5085 | 0.2936 | 0.5637 | 0.090* | |
H9B | 0.4772 | 0.0989 | 0.6466 | 0.090* | |
H10C | 0.4457 | 0.3615 | 0.6565 | 0.090* | |
C5 | 0.2638 (2) | −0.1965 (5) | 0.6965 (3) | 0.0626 (8) | |
H6A | 0.2756 | −0.3622 | 0.7111 | 0.094* | |
H5B | 0.1955 | −0.1609 | 0.6916 | 0.094* | |
H7C | 0.3083 | −0.1099 | 0.7663 | 0.094* | |
O2 | 0.35750 (13) | 0.2207 (3) | 0.38087 (18) | 0.0566 (6) | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
C2 | 0.0471 (14) | 0.0277 (13) | 0.0468 (15) | 0.0010 (10) | 0.0199 (12) | 0.0032 (10) |
C3 | 0.0434 (13) | 0.0307 (12) | 0.0376 (13) | 0.0015 (10) | 0.0167 (10) | −0.0005 (10) |
O1 | 0.138 (2) | 0.0413 (12) | 0.0679 (14) | 0.0128 (12) | 0.0571 (14) | −0.0025 (10) |
C4 | 0.0421 (13) | 0.0370 (13) | 0.0342 (13) | −0.0013 (11) | 0.0123 (10) | −0.0037 (10) |
C7 | 0.0352 (13) | 0.0435 (15) | 0.0477 (15) | 0.0041 (11) | 0.0060 (11) | 0.0069 (12) |
C6 | 0.0434 (14) | 0.0443 (15) | 0.0627 (18) | −0.0013 (12) | 0.0112 (13) | −0.0071 (13) |
C8 | 0.0445 (15) | 0.0544 (17) | 0.0528 (16) | 0.0026 (13) | 0.0153 (12) | −0.0090 (13) |
C9 | 0.0435 (14) | 0.0533 (17) | 0.0454 (15) | 0.0032 (12) | 0.0087 (11) | 0.0126 (12) |
C1 | 0.0446 (15) | 0.066 (2) | 0.069 (2) | −0.0054 (13) | 0.0178 (14) | −0.0017 (15) |
C5 | 0.096 (2) | 0.0485 (17) | 0.0489 (17) | 0.0016 (15) | 0.0295 (16) | 0.0104 (13) |
O2 | 0.0646 (12) | 0.0615 (13) | 0.0520 (12) | −0.0015 (9) | 0.0299 (10) | 0.0064 (9) |
Geometric parameters (Å, º) top
C2—O2 | 1.203 (3) | C6—H4 | 0.9300 |
C2—C1 | 1.497 (3) | C8—C6i | 1.380 (3) |
C2—C3 | 1.521 (3) | C8—H3 | 0.9300 |
C3—C9 | 1.529 (3) | C9—H2A | 0.9700 |
C3—C4 | 1.532 (3) | C9—H1B | 0.9700 |
C3—H8 | 0.9800 | C1—H11A | 0.9600 |
O1—C4 | 1.192 (3) | C1—H9B | 0.9600 |
C4—C5 | 1.478 (3) | C1—H10C | 0.9600 |
C7—C6 | 1.381 (4) | C5—H6A | 0.9600 |
C7—C8 | 1.382 (4) | C5—H5B | 0.9600 |
C7—C9 | 1.509 (3) | C5—H7C | 0.9600 |
C6—C8i | 1.380 (3) | | |
| | | |
O2—C2—C1 | 122.2 (2) | C7—C8—H3 | 119.5 |
O2—C2—C3 | 121.5 (2) | C7—C9—C3 | 112.9 (2) |
C1—C2—C3 | 116.3 (2) | C7—C9—H2A | 109.0 |
C2—C3—C9 | 112.17 (19) | C3—C9—H2A | 109.0 |
C2—C3—C4 | 108.46 (18) | C7—C9—H1B | 109.0 |
C9—C3—C4 | 109.81 (19) | C3—C9—H1B | 109.0 |
C2—C3—H8 | 108.8 | H2A—C9—H1B | 107.8 |
C9—C3—H8 | 108.8 | C2—C1—H11A | 109.5 |
C4—C3—H8 | 108.8 | C2—C1—H9B | 109.5 |
O1—C4—C5 | 121.3 (2) | H11A—C1—H9B | 109.5 |
O1—C4—C3 | 120.2 (2) | C2—C1—H10C | 109.5 |
C5—C4—C3 | 118.4 (2) | H11A—C1—H10C | 109.5 |
C6—C7—C8 | 117.3 (2) | H9B—C1—H10C | 109.5 |
C6—C7—C9 | 121.4 (2) | C4—C5—H6A | 109.5 |
C8—C7—C9 | 121.3 (2) | C4—C5—H5B | 109.5 |
C8i—C6—C7 | 121.8 (3) | H6A—C5—H5B | 109.5 |
C8i—C6—H4 | 119.1 | C4—C5—H7C | 109.5 |
C7—C6—H4 | 119.1 | H6A—C5—H7C | 109.5 |
C6i—C8—C7 | 121.0 (2) | H5B—C5—H7C | 109.5 |
C6i—C8—H3 | 119.5 | | |
| | | |
O2—C2—C3—C9 | −18.3 (3) | C8—C7—C6—C8i | 0.0 (4) |
C1—C2—C3—C9 | 162.7 (2) | C9—C7—C6—C8i | −176.6 (2) |
O2—C2—C3—C4 | 103.1 (3) | C6—C7—C8—C6i | 0.0 (4) |
C1—C2—C3—C4 | −75.9 (3) | C9—C7—C8—C6i | 176.6 (2) |
C2—C3—C4—O1 | −48.7 (3) | C6—C7—C9—C3 | 70.7 (3) |
C9—C3—C4—O1 | 74.2 (3) | C8—C7—C9—C3 | −105.8 (3) |
C2—C3—C4—C5 | 132.5 (2) | C2—C3—C9—C7 | 177.2 (2) |
C9—C3—C4—C5 | −104.6 (3) | C4—C3—C9—C7 | 56.5 (3) |
Symmetry code: (i) −x, −y, −z+1. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H7C···O2ii | 0.96 | 2.53 | 3.385 (4) | 149 |
Symmetry code: (ii) x, −y+1/2, z+1/2. |
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