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Acta Cryst. (2009). E65, o670    [ doi:10.1107/S160053680900720X ]

24,4,8-Trioxa-21-aza-1,3,6(1,2)-tribenzena-2(2,3)-bicyclo[3.3.0]octanacyclooctaphane

P. R. Seshadri, B. Balakrishnan, K. Ilangovan, S. Purushothaman and R. Raghunathan

Abstract top

The crystal structure of the title compound, C26H25NO3, was determined as part of an investigation of host-guest and electron donor-acceptor complexes. The oxazole and the pyrrole rings both adopt envelope conformations. The dihedral angle between the two benzene rings directly linked to the oxazole ring is 49.5 (1)°. The crystal structure is stabilized by a C-H...[pi] interaction.

Comment top

The design and synthesis of cyclophanes possessing rigidly defined cavities and shape-persistent structures of molecular dimensions is of interest as molecular hosts in the areas of host-guest and electron donor-acceptor complexes (Diederich, 1991; Cram & Cram, 1994; Morrison & Hoger, 1996). 1,3-Dipolar cycloaddition reactions afford efficient methods for the construction of heterocyclic units in a highly regio- and stereoselective manner (Padwa, 1984). In particular, the chemistry of azomethine ylides has gained significance in recent years as it serves as an expedient route for the construction of nitrogen heterocycles. N and O heterocycles have also been shown to provide useful information about anticancer and antiviral properties (Chiacchio et al., 2003).

In the crystal structure of the title compound, the oxazole ring adopts an envelope conformation with atom C15 displaced by 0.172 (3) Å from the plane of the other ring atoms N1/O3//C14/C19. The puckering parameters (Cremer & Pople, 1975) and asymmetry parameters (Nardelli, 1983) are q2 =0.275 (2) Å, φ = 152.3 (5)°, ΔS(C15) = 5.7 (2)° and Δ2(C19) = 8.5 (2)°. The pyrrole ring also adopts an envelope conformation with atom C18 displaced by 0.208 (3) Å from the plane of the other ring atoms C15/C16/C17/N1. The puckering parameters (Cremer & Pople, 1975) and asymmetry parameters (Nardelli, 1983) are q2= 0.329 (3) Å, φ = 144.0 (6)°, ΔS(C18) = 0.9 (4)° and Δ2(C16) = 16.5 (4)°.

The conformation of the cyclophane ring O1/ C7/ C6/ C1/ C26/ O2/ C21/ C20/ C19/ C14/ C13/ C8 is described by the torsion angles in Table 1. The dihedral angle between the two benzene rings directly linked to the oxazole ring is 49.5 (1)°. The bond lengths (Allen et al., 1987) and bond angles are in agreement with the values reported in literature.

The crystal structure is stabilized by a C—H···π (C7—H7A···Cg1) interaction, where Cg1 is the centroid of the C1—C6 ring.

Related literature top

For biological properties of azomethine ylides, see: Chiacchio et al. (2003). For general background, see: Diederich (1991); Cram & Cram (1994); Morrison & Hoger (1996); Padwa (1984). For reference bond-length data, see: Allen et al. (1987). Cg1 is the centroid of the C1–C6 ring. For puckering and asymmetry parameters, see: Cremer & Pople (1975); Nardelli (1983).

Experimental top

To a solution of O,O'-coupled salicylaldehyde (bis aldehyde), using o-xylylene bromide (2 mmol) in dry acetonitrile (20 ml), was added L-proline (1 mmol) under an N2 atmosphere. The reaction was refluxed for 4 h. After completion of the reaction, the solvent was distilled off under reduced pressure and the crude product was purified by column chromatography.

Refinement top

All H atoms were positioned geometrically and allowed to ride on their parent atoms, with C—H = 0.93-0.98 Å and Uiso(H) = 1.2Ueq(C).

Computing details top

Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).

Figures top
[Figure 1] Fig. 1. Molecular structure of the title compound, showing 30% probability displacement ellipsoids. Hydrogen atoms are drawn as spheres of arbitrary radius. Hydrogen atoms of the benzene rings are omitted for clarity.
24,4,8-Trioxa-21-aza-1,3,6(1,2)-tribenzena-2(2,3)- bicyclo[3.3.0]octanacyclooctaphane top
Crystal data top
C26H25NO3F(000) = 1696
Mr = 399.47Dx = 1.289 Mg m−3
Monoclinic, C2/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: C2/cCell parameters from 4735 reflections
a = 31.1942 (7) Åθ = 1.3–28.2°
b = 8.3992 (2) ŵ = 0.08 mm−1
c = 16.0323 (4) ÅT = 293 K
β = 101.468 (1)°Block, colourless
V = 4116.70 (17) Å30.25 × 0.20 × 0.20 mm
Z = 8
Data collection top
Bruker Kappa APEXII area-detector
diffractometer		5004 independent reflections
Radiation source: fine-focus sealed tube2790 reflections with I > 2σ(I)
graphiteRint = 0.029
ω scansθmax = 28.2°, θmin = 1.3°
Absorption correction: multi-scan
(SADABS; Sheldrick, 2001)		h = −40→41
Tmin = 0.979, Tmax = 0.983k = −11→10
22005 measured reflectionsl = −20→21
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.059Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.213H-atom parameters constrained
S = 1.03 w = 1/[σ2(Fo2) + (0.1118P)2 + 1.2039P]
where P = (Fo2 + 2Fc2)/3
5004 reflections(Δ/σ)max < 0.001
271 parametersΔρmax = 0.40 e Å−3
0 restraintsΔρmin = −0.22 e Å−3
Crystal data top
C26H25NO3V = 4116.70 (17) Å3
Mr = 399.47Z = 8
Monoclinic, C2/cMo Kα radiation
a = 31.1942 (7) ŵ = 0.08 mm−1
b = 8.3992 (2) ÅT = 293 K
c = 16.0323 (4) Å0.25 × 0.20 × 0.20 mm
β = 101.468 (1)°
Data collection top
Bruker Kappa APEXII area-detector
diffractometer		5004 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 2001)		2790 reflections with I > 2σ(I)
Tmin = 0.979, Tmax = 0.983Rint = 0.029
22005 measured reflectionsθmax = 28.2°
Refinement top
R[F2 > 2σ(F2)] = 0.059H-atom parameters constrained
wR(F2) = 0.213Δρmax = 0.40 e Å−3
S = 1.03Δρmin = −0.22 e Å−3
5004 reflectionsAbsolute structure: ?
271 parametersFlack parameter: ?
0 restraintsRogers parameter: ?
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
xyzUiso*/Ueq
O10.20831 (5)1.12120 (17)0.44961 (9)0.0625 (4)
O20.14559 (5)0.87432 (17)0.35663 (10)0.0594 (4)
O30.11764 (7)1.3961 (2)0.32924 (11)0.0843 (6)
N10.06599 (6)1.2386 (2)0.24650 (12)0.0645 (5)
C10.21940 (7)0.7919 (3)0.37217 (15)0.0599 (6)
C20.22911 (10)0.7010 (3)0.30588 (17)0.0781 (8)
H20.20900.62620.27940.094*
C30.26785 (11)0.7196 (4)0.27879 (19)0.0905 (9)
H30.27390.65770.23450.109*
C40.29724 (11)0.8295 (4)0.3174 (2)0.0923 (9)
H40.32360.84190.29930.111*
C50.28860 (8)0.9222 (3)0.38261 (18)0.0752 (7)
H50.30900.99710.40810.090*
C60.24927 (8)0.9047 (3)0.41087 (15)0.0607 (6)
C70.24064 (8)1.0041 (3)0.48294 (15)0.0668 (6)
H7A0.23020.93760.52420.080*
H7B0.26741.05600.51120.080*
C80.17635 (7)1.1527 (2)0.49412 (13)0.0527 (5)
C90.18214 (9)1.1313 (3)0.58168 (14)0.0665 (6)
H90.20891.09640.61250.080*
C100.14848 (10)1.1616 (3)0.62241 (16)0.0745 (7)
H100.15231.14560.68080.089*
C110.10922 (10)1.2155 (3)0.57754 (17)0.0774 (7)
H110.08621.23430.60520.093*
C120.10395 (8)1.2421 (3)0.49096 (16)0.0704 (7)
H120.07741.28160.46120.084*
C130.13715 (7)1.2113 (2)0.44787 (13)0.0525 (5)
C140.13172 (7)1.2381 (3)0.35333 (14)0.0563 (5)
H140.16031.22240.33810.068*
C150.07270 (10)1.3900 (3)0.28885 (17)0.0798 (8)
H150.05381.40130.33060.096*
C160.06289 (13)1.5177 (4)0.22115 (19)0.1011 (10)
H16A0.03881.58450.23010.121*
H16B0.08841.58400.22130.121*
C170.05085 (14)1.4273 (4)0.1393 (2)0.1170 (12)
H17A0.01931.42200.12090.140*
H17B0.06311.47820.09500.140*
C180.06941 (10)1.2667 (3)0.15755 (16)0.0816 (8)
H18A0.05281.18820.12010.098*
H18B0.09971.26310.15110.098*
C190.09799 (7)1.1284 (2)0.29399 (13)0.0525 (5)
H190.11331.07700.25340.063*
C200.07809 (7)0.9999 (3)0.33905 (12)0.0519 (5)
C210.10425 (7)0.8702 (2)0.37255 (13)0.0540 (5)
C220.08812 (9)0.7507 (3)0.41656 (16)0.0687 (7)
H220.10580.66570.43910.082*
C230.04511 (10)0.7597 (3)0.42659 (19)0.0816 (8)
H230.03380.68010.45630.098*
C240.01903 (9)0.8843 (4)0.3933 (2)0.0832 (8)
H24−0.00990.88860.40010.100*
C250.03556 (8)1.0033 (3)0.34981 (16)0.0698 (7)
H250.01761.08750.32730.084*
C260.17676 (7)0.7624 (3)0.39923 (16)0.0657 (6)
H26A0.16680.65480.38450.079*
H26B0.18040.77500.46040.079*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
O10.0701 (10)0.0589 (9)0.0583 (9)0.0164 (7)0.0121 (8)0.0064 (7)
O20.0591 (9)0.0554 (9)0.0626 (9)0.0100 (7)0.0094 (7)0.0100 (7)
O30.1190 (16)0.0529 (10)0.0703 (11)−0.0025 (9)−0.0067 (10)0.0091 (8)
N10.0603 (12)0.0722 (13)0.0579 (11)0.0056 (9)0.0046 (9)0.0161 (9)
C10.0632 (14)0.0525 (12)0.0595 (13)0.0157 (10)0.0015 (11)0.0063 (10)
C20.0860 (19)0.0707 (16)0.0692 (16)0.0215 (13)−0.0045 (14)−0.0063 (13)
C30.098 (2)0.100 (2)0.0741 (18)0.0352 (18)0.0192 (17)−0.0050 (16)
C40.083 (2)0.111 (2)0.089 (2)0.0345 (18)0.0320 (17)0.0158 (19)
C50.0646 (16)0.0723 (16)0.0863 (18)0.0094 (12)0.0089 (13)0.0138 (14)
C60.0640 (14)0.0521 (12)0.0622 (14)0.0154 (10)0.0035 (11)0.0072 (10)
C70.0656 (15)0.0626 (14)0.0653 (15)0.0142 (11)−0.0032 (11)0.0013 (11)
C80.0643 (13)0.0428 (11)0.0487 (11)−0.0024 (9)0.0059 (10)−0.0038 (8)
C90.0797 (16)0.0666 (15)0.0478 (12)−0.0007 (12)−0.0003 (11)−0.0036 (10)
C100.104 (2)0.0747 (16)0.0452 (12)−0.0122 (14)0.0145 (14)−0.0080 (11)
C110.0869 (19)0.0867 (19)0.0649 (16)−0.0075 (14)0.0302 (15)−0.0144 (13)
C120.0687 (15)0.0807 (17)0.0619 (15)0.0058 (12)0.0136 (12)−0.0048 (12)
C130.0616 (13)0.0468 (11)0.0486 (11)−0.0020 (9)0.0097 (10)−0.0061 (9)
C140.0621 (13)0.0550 (13)0.0502 (12)0.0010 (9)0.0074 (10)0.0041 (9)
C150.104 (2)0.0718 (17)0.0639 (15)0.0302 (14)0.0183 (15)0.0094 (12)
C160.144 (3)0.080 (2)0.0763 (19)0.0394 (18)0.0144 (18)0.0199 (16)
C170.178 (4)0.086 (2)0.078 (2)0.009 (2)0.004 (2)0.0264 (18)
C180.102 (2)0.0821 (18)0.0520 (14)−0.0150 (14)−0.0052 (13)0.0114 (12)
C190.0564 (12)0.0537 (12)0.0461 (11)0.0062 (9)0.0074 (9)0.0007 (9)
C200.0541 (13)0.0550 (12)0.0445 (11)0.0000 (9)0.0046 (9)−0.0044 (9)
C210.0617 (13)0.0503 (12)0.0473 (11)−0.0052 (9)0.0044 (9)−0.0047 (9)
C220.0781 (17)0.0597 (14)0.0647 (15)−0.0086 (11)0.0053 (12)0.0034 (11)
C230.092 (2)0.0769 (18)0.0759 (18)−0.0253 (15)0.0164 (15)0.0091 (14)
C240.0637 (16)0.094 (2)0.093 (2)−0.0116 (14)0.0185 (14)0.0062 (16)
C250.0621 (15)0.0729 (16)0.0733 (16)−0.0012 (11)0.0109 (12)0.0062 (12)
C260.0678 (15)0.0525 (13)0.0717 (15)0.0072 (10)0.0019 (12)0.0098 (11)
Geometric parameters (Å, °) top
O1—C81.362 (2)C11—H110.9300
O1—C71.433 (2)C12—C131.379 (3)
O2—C211.364 (3)C12—H120.9300
O2—C261.425 (2)C13—C141.508 (3)
O3—C151.423 (3)C14—C191.569 (3)
O3—C141.427 (3)C14—H140.9800
N1—C151.437 (3)C15—C161.513 (4)
N1—C191.459 (3)C15—H150.9800
N1—C181.470 (3)C16—C171.498 (5)
C1—C61.386 (3)C16—H16A0.9700
C1—C21.390 (3)C16—H16B0.9700
C1—C261.500 (3)C17—C181.475 (4)
C2—C31.372 (4)C17—H17A0.9700
C2—H20.9300C17—H17B0.9700
C3—C41.360 (5)C18—H18A0.9700
C3—H30.9300C18—H18B0.9700
C4—C51.373 (4)C19—C201.501 (3)
C4—H40.9300C19—H190.9800
C5—C61.398 (3)C20—C251.372 (3)
C5—H50.9300C20—C211.402 (3)
C6—C71.493 (3)C21—C221.378 (3)
C7—H7A0.9700C22—C231.385 (4)
C7—H7B0.9700C22—H220.9300
C8—C131.388 (3)C23—C241.367 (4)
C8—C91.391 (3)C23—H230.9300
C9—C101.366 (4)C24—C251.376 (4)
C9—H90.9300C24—H240.9300
C10—C111.368 (4)C25—H250.9300
C10—H100.9300C26—H26A0.9700
C11—C121.383 (4)C26—H26B0.9700
C8—O1—C7118.15 (17)O3—C15—N1106.52 (19)
C21—O2—C26118.28 (17)O3—C15—C16110.0 (3)
C15—O3—C14108.19 (18)N1—C15—C16107.4 (2)
C15—N1—C19107.11 (18)O3—C15—H15110.9
C15—N1—C18106.54 (19)N1—C15—H15110.9
C19—N1—C18115.7 (2)C16—C15—H15110.9
C6—C1—C2119.2 (2)C17—C16—C15104.4 (3)
C6—C1—C26122.7 (2)C17—C16—H16A110.9
C2—C1—C26118.1 (2)C15—C16—H16A110.9
C3—C2—C1121.3 (3)C17—C16—H16B110.9
C3—C2—H2119.4C15—C16—H16B110.9
C1—C2—H2119.4H16A—C16—H16B108.9
C4—C3—C2119.3 (3)C18—C17—C16105.6 (2)
C4—C3—H3120.3C18—C17—H17A110.6
C2—C3—H3120.3C16—C17—H17A110.6
C3—C4—C5121.0 (3)C18—C17—H17B110.6
C3—C4—H4119.5C16—C17—H17B110.6
C5—C4—H4119.5H17A—C17—H17B108.7
C4—C5—C6120.3 (3)N1—C18—C17103.8 (2)
C4—C5—H5119.8N1—C18—H18A111.0
C6—C5—H5119.8C17—C18—H18A111.0
C1—C6—C5118.8 (2)N1—C18—H18B111.0
C1—C6—C7121.3 (2)C17—C18—H18B111.0
C5—C6—C7119.8 (2)H18A—C18—H18B109.0
O1—C7—C6108.49 (18)N1—C19—C20113.70 (17)
O1—C7—H7A110.0N1—C19—C14104.53 (17)
C6—C7—H7A110.0C20—C19—C14114.96 (17)
O1—C7—H7B110.0N1—C19—H19107.8
C6—C7—H7B110.0C20—C19—H19107.8
H7A—C7—H7B108.4C14—C19—H19107.8
O1—C8—C13116.60 (18)C25—C20—C21118.2 (2)
O1—C8—C9122.8 (2)C25—C20—C19123.3 (2)
C13—C8—C9120.6 (2)C21—C20—C19118.58 (18)
C10—C9—C8120.0 (2)O2—C21—C22124.7 (2)
C10—C9—H9120.0O2—C21—C20114.11 (18)
C8—C9—H9120.0C22—C21—C20121.2 (2)
C9—C10—C11120.2 (2)C21—C22—C23118.7 (2)
C9—C10—H10119.9C21—C22—H22120.6
C11—C10—H10119.9C23—C22—H22120.6
C10—C11—C12119.8 (2)C24—C23—C22120.8 (2)
C10—C11—H11120.1C24—C23—H23119.6
C12—C11—H11120.1C22—C23—H23119.6
C13—C12—C11121.4 (2)C23—C24—C25120.0 (3)
C13—C12—H12119.3C23—C24—H24120.0
C11—C12—H12119.3C25—C24—H24120.0
C12—C13—C8117.9 (2)C20—C25—C24121.2 (2)
C12—C13—C14122.0 (2)C20—C25—H25119.4
C8—C13—C14120.04 (19)C24—C25—H25119.4
O3—C14—C13112.20 (18)O2—C26—C1108.19 (18)
O3—C14—C19104.38 (17)O2—C26—H26A110.1
C13—C14—C19116.72 (18)C1—C26—H26A110.1
O3—C14—H14107.7O2—C26—H26B110.1
C13—C14—H14107.7C1—C26—H26B110.1
C19—C14—H14107.7H26A—C26—H26B108.4
C6—C1—C2—C30.7 (4)C19—N1—C15—C16145.9 (2)
C26—C1—C2—C3−178.8 (2)C18—N1—C15—C1621.5 (3)
C1—C2—C3—C4−0.2 (4)O3—C15—C16—C17115.0 (3)
C2—C3—C4—C5−0.3 (5)N1—C15—C16—C17−0.5 (4)
C3—C4—C5—C60.3 (4)C15—C16—C17—C18−20.5 (4)
C2—C1—C6—C5−0.7 (3)C15—N1—C18—C17−34.3 (3)
C26—C1—C6—C5178.8 (2)C19—N1—C18—C17−153.2 (2)
C2—C1—C6—C7−179.3 (2)C16—C17—C18—N133.6 (4)
C26—C1—C6—C70.2 (3)C15—N1—C19—C20111.9 (2)
C4—C5—C6—C10.2 (3)C18—N1—C19—C20−129.5 (2)
C4—C5—C6—C7178.9 (2)C15—N1—C19—C14−14.3 (2)
C8—O1—C7—C6138.6 (2)C18—N1—C19—C14104.3 (2)
C1—C6—C7—O1−74.0 (3)O3—C14—C19—N1−4.3 (2)
C5—C6—C7—O1107.5 (2)C13—C14—C19—N1120.2 (2)
C7—O1—C8—C13−154.37 (19)O3—C14—C19—C20−129.65 (19)
C7—O1—C8—C926.9 (3)C13—C14—C19—C20−5.2 (3)
O1—C8—C9—C10−178.5 (2)N1—C19—C20—C25−12.9 (3)
C13—C8—C9—C102.8 (3)C14—C19—C20—C25107.6 (2)
C8—C9—C10—C11−1.1 (4)N1—C19—C20—C21167.67 (18)
C9—C10—C11—C12−1.2 (4)C14—C19—C20—C21−71.9 (2)
C10—C11—C12—C131.8 (4)C26—O2—C21—C22−10.6 (3)
C11—C12—C13—C8−0.1 (3)C26—O2—C21—C20170.11 (18)
C11—C12—C13—C14179.4 (2)C25—C20—C21—O2178.11 (19)
O1—C8—C13—C12179.08 (19)C19—C20—C21—O2−2.4 (3)
C9—C8—C13—C12−2.2 (3)C25—C20—C21—C22−1.2 (3)
O1—C8—C13—C14−0.4 (3)C19—C20—C21—C22178.2 (2)
C9—C8—C13—C14178.3 (2)O2—C21—C22—C23−178.6 (2)
C15—O3—C14—C13−105.7 (2)C20—C21—C22—C230.7 (3)
C15—O3—C14—C1921.6 (2)C21—C22—C23—C240.2 (4)
C12—C13—C14—O354.1 (3)C22—C23—C24—C25−0.5 (4)
C8—C13—C14—O3−126.5 (2)C21—C20—C25—C240.9 (3)
C12—C13—C14—C19−66.3 (3)C19—C20—C25—C24−178.5 (2)
C8—C13—C14—C19113.2 (2)C23—C24—C25—C20−0.1 (4)
C14—O3—C15—N1−31.6 (3)C21—O2—C26—C1−179.37 (17)
C14—O3—C15—C16−147.6 (2)C6—C1—C26—O284.9 (3)
C19—N1—C15—O328.2 (2)C2—C1—C26—O2−95.5 (2)
C18—N1—C15—O3−96.2 (2)
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
C7—H7A···Cg1i0.972.943.827 (3)153
Symmetry codes: (i) −x+1/2, −y−1/2, −z+1.
Table 1
Selected geometric parameters (°) top
C26—C1—C6—C70.2 (3)C13—C14—C19—C20−5.2 (3)
C8—O1—C7—C6138.6 (2)C14—C19—C20—C21−71.9 (2)
C1—C6—C7—O1−74.0 (3)C26—O2—C21—C20170.11 (18)
C7—O1—C8—C13−154.37 (19)C19—C20—C21—O2−2.4 (3)
O1—C8—C13—C14−0.4 (3)C21—O2—C26—C1−179.37 (17)
C8—C13—C14—C19113.2 (2)C6—C1—C26—O284.9 (3)
Table 2
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
C7—H7A···Cg1i0.972.943.827 (3)153
Symmetry codes: (i) −x+1/2, −y−1/2, −z+1.
Acknowledgements top

BB thanks Dr Babu Varghese, SAIF, IIT-Madras, India, for his help with the data collection.

references
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