1-Phenyl-1H-naphtho­[1,2-e][1,3]oxazin-3(2H)-one

Gondal, H.Y.; Bhatti, M.; Gohar, A.; Ali, M.; Tahir, M.N.

doi:10.1107/S1600536810035841

organic compounds

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ISSN: 2056-9890

Volume 66| Part 10| October 2010| Page o2555

doi:10.1107/S1600536810035841

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1-Phenyl-1H-naphtho[1,2-e][1,3]oxazin-3(2H)-one

Humaira Y. Gondal,^a Misbah Bhatti,^a Azra Gohar,^a Muhammad Ali ^a and M. Nawaz Tahir ^b ^*

^aDepartment of Chemistry, University of Sargodha, Sargodha, Pakistan, and ^bDepartment of Physics, University of Sargodha, Sargodha, Pakistan
^*Correspondence e-mail: dmntahir_uos@yahoo.com

(Received 5 September 2010; accepted 6 September 2010; online 11 September 2010)

In the title compound, C₁₈H₁₃NO₂, the naphthalene (r.m.s. deviation = 0.025 Å) and benzaldehyde (r.m.s. deviation = 0.006 Å) groups are oriented at a dihedral angle of 89.48 (4)°. The oxazine group is oriented at dihedral angles of 13.36 (4) and 85.08 (5)°, respectively, with respect to the naphthalene and benzaldehyde fragments. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R₂²(8) loops. The dimers are linked into [010] chains via N—H⋯O hydrogen bonds. Weak C—H⋯π links and aromatic π–π stacking between the centroids of the naphthalene phenyl rings [centroid–centroid separation = 3.5977 (8) Å] help to consolidate the packing.

Related literature

For background to oxazinones, see: Patel et al. (1999 ); Waxman & Darke (2000 ). For graph-set notation, see: Bernstein et al. (1995 ).

Experimental

Crystal data

C₁₈H₁₃NO₂
M_r = 275.29
Monoclinic, P 2₁ /c
a = 11.5625 (4) Å
b = 16.9228 (5) Å
c = 7.2394 (2) Å
β = 98.155 (1)°
V = 1402.21 (7) Å³
Z = 4
Mo Kα radiation
μ = 0.09 mm⁻¹
T = 296 K
0.32 × 0.22 × 0.22 mm

Data collection

Bruker Kappa APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2005 ) T_min = 0.980, T_max = 0.982
9236 measured reflections
2533 independent reflections
1961 reflections with I > 2σ(I)
R_int = 0.022

Refinement

R[F² > 2σ(F²)] = 0.039
wR(F²) = 0.111
S = 1.03
2533 reflections
190 parameters
H-atom parameters constrained
Δρ_max = 0.16 e Å⁻³
Δρ_min = −0.15 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

Cg2 is the centroid of the C1–C6 phenyl ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O2ⁱ	0.86	2.07	2.8698 (17)	155
C8—H8⋯O1ⁱⁱ	0.93	2.58	3.4725 (18)	161
C16—H16⋯Cg2ⁱⁱⁱ	0.93	2.92	3.722 (2)	145
Symmetry codes: (i) $[x, -y+{\script{1\over 2}}, z-{\script{1\over 2}}]$ ; (ii) -x+2, -y, -z+2; (iii) -x+1, -y, -z+1.

Data collection: APEX2 (Bruker, 2009 ); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997 ) and PLATON (Spek, 2009 ); software used to prepare material for publication: WinGX (Farrugia, 1999 ) and PLATON.

Supporting information

Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536810035841/hb5635sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536810035841/hb5635Isup2.hkl

checkCIF report

Comment top

Oxazinones are an important class of heterocyclic compounds with a diverse range of biological activities (Patel et al., 1999; Waxman & Darke, 2000). During recent studies for the search of efficient, simple and green method for the preparation of naphthalene-condensed 1,3-oxazin-3-one derivatives, we have obtained the title compound (I, Fig. 1).

In the title compound, the naphthalene group A (C1—C10) and moiety B (C11—C17) of benzaldehyde group are planar with r. m. s. deviations of 0.0252 and 0.0056 Å, respectively. The dihedral angle between A/B is 89.48 (4)°. The fused group C (O1/C18/O2/N1) is also planar with r. m. s. deviation of 0.0037 Å. The dihedral angle between A/C and B/C is 13.36 (4) and 85.08 (5)°, respectively. The title compound is dimerized due to H-bonding of C—H···O type (Table 1, Fig. 2) with R₂²(8) ring motifs (Bernstein et al., 1995). The dimers are interlinked due to N—H···O type of H-bondings (Table 1, Fig. 2). There exists π–π interaction between the centroids of phenyl rings (C1/C6—C10) at a distance of 3.5977 (8) Å [symmetry code: 2 - x, - y, 1 - z]. The molecules are stabilized in the form of infinite one dimensional polymeric chains extending along the c axis.

Related literature top

For background to oxazinones, see: Patel et al. (1999); Waxman & Darke (2000). For graph-set notation, see: Bernstein et al. (1995).

Experimental top

A mixture of β-naphthol (1.0 mmol), benzaldehyde (1.0 mmol), urea (1.0 mmol) and CuCl₂ (0.1 mm mol) as a catalyst, were heated at 393 K in a round bottom flask for 3 h. The reaction was monitored through TLC. After completion of the reaction, the mixture was cooled to room temperature and washed thoroughly with distilled water. The crude product obtained was recrystallized from petroleum ether:ethyl acetate (1:5) to affoard colourless rods of (I) after 24 h.

Computing details top

Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: WinGX (Farrugia, 1999) and PLATON (Spek, 2009).

Figures top

	Fig. 1. View of (I) with displacement ellipsoids drawn at the 50% probability level. H-atoms are shown as small spheres of arbitrary radii.
	Fig. 2. The partial packing of (I), which shows that molecules are dimerized which are interlinked in one dimensional infinite polymeric chains.

1-Phenyl-1H-naphtho[1,2-e][1,3]oxazin-3(2H)-one top

Crystal data top

C₁₈H₁₃NO₂	F(000) = 576
M_r = 275.29	D_x = 1.304 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 1961 reflections
a = 11.5625 (4) Å	θ = 2.2–25.3°
b = 16.9228 (5) Å	µ = 0.09 mm⁻¹
c = 7.2394 (2) Å	T = 296 K
β = 98.155 (1)°	Rod, colourless
V = 1402.21 (7) Å³	0.32 × 0.22 × 0.22 mm
Z = 4

Data collection top

Bruker Kappa APEXII CCD diffractometer	2533 independent reflections
Radiation source: fine-focus sealed tube	1961 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.022
Detector resolution: 8.10 pixels mm^-1	θ_max = 25.3°, θ_min = 2.2°
ω scans	h = −13→13
Absorption correction: multi-scan (SADABS; Bruker, 2005)	k = −18→20
T_min = 0.980, T_max = 0.982	l = −8→6
9236 measured reflections

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)] = 0.039	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.111	H-atom parameters constrained
S = 1.03	w = 1/[σ²(F_o²) + (0.0535P)² + 0.2624P] where P = (F_o² + 2F_c²)/3
2533 reflections	(Δ/σ)_max < 0.001
190 parameters	Δρ_max = 0.16 e Å⁻³
0 restraints	Δρ_min = −0.15 e Å⁻³

Crystal data top

C₁₈H₁₃NO₂	V = 1402.21 (7) Å³
M_r = 275.29	Z = 4
Monoclinic, P2₁/c	Mo Kα radiation
a = 11.5625 (4) Å	µ = 0.09 mm⁻¹
b = 16.9228 (5) Å	T = 296 K
c = 7.2394 (2) Å	0.32 × 0.22 × 0.22 mm
β = 98.155 (1)°

Data collection top

Bruker Kappa APEXII CCD diffractometer	2533 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2005)	1961 reflections with I > 2σ(I)
T_min = 0.980, T_max = 0.982	R_int = 0.022
9236 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.039	0 restraints
wR(F²) = 0.111	H-atom parameters constrained
S = 1.03	Δρ_max = 0.16 e Å⁻³
2533 reflections	Δρ_min = −0.15 e Å⁻³
190 parameters

Special details top

Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles

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	U_iso*/U_eq
O1	0.89839 (10)	0.06939 (6)	0.83483 (14)	0.0559 (4)
O2	0.91991 (11)	0.19318 (7)	0.92712 (18)	0.0737 (5)
N1	0.85664 (10)	0.16926 (7)	0.62191 (18)	0.0510 (4)
C1	0.81409 (12)	−0.02577 (8)	0.3762 (2)	0.0436 (5)
C2	0.75736 (14)	−0.01136 (10)	0.1926 (2)	0.0563 (5)
C3	0.73596 (18)	−0.07145 (12)	0.0667 (3)	0.0715 (7)
C4	0.77142 (19)	−0.14822 (12)	0.1148 (3)	0.0767 (8)
C5	0.82829 (16)	−0.16422 (10)	0.2880 (3)	0.0656 (7)
C6	0.85044 (12)	−0.10406 (8)	0.4248 (2)	0.0488 (5)
C7	0.90596 (13)	−0.11995 (8)	0.6071 (2)	0.0523 (5)
C8	0.92163 (13)	−0.06237 (8)	0.7386 (2)	0.0502 (5)
C9	0.88322 (12)	0.01469 (8)	0.6891 (2)	0.0435 (4)
C10	0.83343 (11)	0.03472 (8)	0.51467 (19)	0.0406 (4)
C11	0.79834 (12)	0.11910 (8)	0.4725 (2)	0.0434 (4)
C12	0.66655 (12)	0.13238 (8)	0.4466 (2)	0.0459 (5)
C13	0.61359 (16)	0.18002 (12)	0.3073 (3)	0.0771 (7)
C14	0.49394 (18)	0.19161 (15)	0.2832 (3)	0.0978 (9)
C15	0.42673 (16)	0.15621 (12)	0.3962 (3)	0.0782 (7)
C16	0.47770 (16)	0.10947 (12)	0.5371 (3)	0.0766 (7)
C17	0.59754 (15)	0.09745 (10)	0.5628 (3)	0.0653 (6)
C18	0.89155 (13)	0.14824 (9)	0.7974 (2)	0.0523 (5)
H1	0.86962	0.21742	0.59296	0.0612*
H2	0.73438	0.03977	0.15747	0.0675*
H3	0.69733	−0.06099	−0.05240	0.0857*
H4	0.75608	−0.18873	0.02799	0.0920*
H5	0.85317	−0.21554	0.31735	0.0787*
H7	0.93233	−0.17084	0.63780	0.0627*
H8	0.95707	−0.07359	0.85922	0.0602*
H11	0.82686	0.13419	0.35624	0.0520*
H13	0.65851	0.20496	0.22768	0.0926*
H14	0.45948	0.22429	0.18762	0.1174*
H15	0.34624	0.16371	0.37798	0.0938*
H16	0.43200	0.08537	0.61676	0.0919*
H17	0.63155	0.06536	0.65983	0.0783*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
O1	0.0719 (7)	0.0430 (6)	0.0505 (6)	−0.0007 (5)	0.0006 (5)	−0.0011 (5)
O2	0.0814 (9)	0.0577 (7)	0.0769 (8)	0.0065 (6)	−0.0061 (7)	−0.0244 (6)
N1	0.0508 (7)	0.0327 (6)	0.0675 (9)	−0.0037 (5)	0.0017 (6)	0.0014 (6)
C1	0.0422 (8)	0.0404 (8)	0.0512 (8)	−0.0057 (6)	0.0170 (6)	−0.0019 (6)
C2	0.0645 (10)	0.0564 (9)	0.0502 (9)	−0.0054 (8)	0.0162 (7)	−0.0021 (8)
C3	0.0857 (13)	0.0788 (13)	0.0523 (10)	−0.0123 (10)	0.0180 (9)	−0.0131 (9)
C4	0.0951 (15)	0.0696 (12)	0.0709 (13)	−0.0161 (10)	0.0309 (11)	−0.0278 (10)
C5	0.0740 (12)	0.0438 (9)	0.0859 (13)	−0.0071 (8)	0.0352 (10)	−0.0134 (9)
C6	0.0459 (8)	0.0381 (8)	0.0669 (10)	−0.0049 (6)	0.0236 (7)	−0.0035 (7)
C7	0.0479 (8)	0.0346 (7)	0.0771 (11)	0.0021 (6)	0.0187 (8)	0.0068 (7)
C8	0.0462 (8)	0.0431 (8)	0.0610 (9)	0.0017 (6)	0.0067 (7)	0.0122 (7)
C9	0.0435 (8)	0.0375 (7)	0.0498 (8)	−0.0027 (6)	0.0080 (6)	0.0004 (6)
C10	0.0374 (7)	0.0352 (7)	0.0506 (8)	−0.0022 (5)	0.0113 (6)	0.0032 (6)
C11	0.0459 (8)	0.0354 (7)	0.0491 (8)	−0.0030 (6)	0.0077 (6)	0.0045 (6)
C12	0.0459 (8)	0.0357 (7)	0.0553 (9)	−0.0012 (6)	0.0042 (6)	0.0004 (6)
C13	0.0565 (10)	0.0874 (13)	0.0853 (13)	0.0041 (9)	0.0026 (9)	0.0366 (11)
C14	0.0629 (12)	0.1150 (18)	0.1095 (17)	0.0172 (12)	−0.0088 (12)	0.0423 (14)
C15	0.0478 (10)	0.0796 (13)	0.1042 (15)	0.0064 (9)	0.0009 (10)	−0.0069 (12)
C16	0.0562 (11)	0.0755 (12)	0.1031 (15)	−0.0015 (9)	0.0287 (10)	0.0056 (11)
C17	0.0546 (10)	0.0646 (11)	0.0795 (12)	0.0073 (8)	0.0192 (8)	0.0200 (9)
C18	0.0481 (8)	0.0421 (8)	0.0653 (10)	0.0026 (6)	0.0034 (7)	−0.0061 (8)

Geometric parameters (Å, º) top

O1—C9	1.3958 (17)	C12—C17	1.373 (2)
O1—C18	1.3617 (18)	C12—C13	1.366 (3)
O2—C18	1.2167 (19)	C13—C14	1.384 (3)
N1—C11	1.4622 (19)	C14—C15	1.346 (3)
N1—C18	1.3259 (19)	C15—C16	1.358 (3)
N1—H1	0.8600	C16—C17	1.387 (3)
C1—C2	1.417 (2)	C2—H2	0.9300
C1—C10	1.4280 (19)	C3—H3	0.9300
C1—C6	1.4191 (19)	C4—H4	0.9300
C2—C3	1.365 (3)	C5—H5	0.9300
C3—C4	1.392 (3)	C7—H7	0.9300
C4—C5	1.358 (3)	C8—H8	0.9300
C5—C6	1.418 (2)	C11—H11	0.9800
C6—C7	1.409 (2)	C13—H13	0.9300
C7—C8	1.356 (2)	C14—H14	0.9300
C8—C9	1.4075 (19)	C15—H15	0.9300
C9—C10	1.355 (2)	C16—H16	0.9300
C10—C11	1.5039 (19)	C17—H17	0.9300
C11—C12	1.525 (2)

C9—O1—C18	120.13 (11)	C15—C16—C17	120.35 (19)
C11—N1—C18	126.78 (12)	C12—C17—C16	120.75 (18)
C11—N1—H1	117.00	O2—C18—N1	125.73 (14)
C18—N1—H1	117.00	O1—C18—O2	117.21 (13)
C2—C1—C6	118.33 (13)	O1—C18—N1	117.05 (13)
C6—C1—C10	118.94 (13)	C1—C2—H2	120.00
C2—C1—C10	122.72 (13)	C3—C2—H2	120.00
C1—C2—C3	120.94 (16)	C2—C3—H3	120.00
C2—C3—C4	120.63 (19)	C4—C3—H3	120.00
C3—C4—C5	120.27 (19)	C3—C4—H4	120.00
C4—C5—C6	121.17 (16)	C5—C4—H4	120.00
C5—C6—C7	122.02 (14)	C4—C5—H5	119.00
C1—C6—C5	118.64 (14)	C6—C5—H5	119.00
C1—C6—C7	119.33 (13)	C6—C7—H7	119.00
C6—C7—C8	121.20 (13)	C8—C7—H7	119.00
C7—C8—C9	118.75 (13)	C7—C8—H8	121.00
O1—C9—C10	122.00 (12)	C9—C8—H8	121.00
O1—C9—C8	114.88 (12)	N1—C11—H11	108.00
C8—C9—C10	123.11 (13)	C10—C11—H11	108.00
C1—C10—C11	121.82 (12)	C12—C11—H11	108.00
C1—C10—C9	118.59 (12)	C12—C13—H13	120.00
C9—C10—C11	119.58 (12)	C14—C13—H13	120.00
C10—C11—C12	113.63 (11)	C13—C14—H14	120.00
N1—C11—C12	110.68 (11)	C15—C14—H14	120.00
N1—C11—C10	108.56 (11)	C14—C15—H15	120.00
C11—C12—C13	120.86 (14)	C16—C15—H15	120.00
C11—C12—C17	121.24 (13)	C15—C16—H16	120.00
C13—C12—C17	117.89 (15)	C17—C16—H16	120.00
C12—C13—C14	120.81 (18)	C12—C17—H17	120.00
C13—C14—C15	120.9 (2)	C16—C17—H17	120.00
C14—C15—C16	119.30 (18)

C18—O1—C9—C8	164.13 (13)	C5—C6—C7—C8	−176.94 (15)
C18—O1—C9—C10	−16.9 (2)	C6—C7—C8—C9	−1.2 (2)
C9—O1—C18—O2	−170.95 (14)	C7—C8—C9—O1	177.44 (13)
C9—O1—C18—N1	7.8 (2)	C7—C8—C9—C10	−1.5 (2)
C18—N1—C11—C10	−27.00 (19)	O1—C9—C10—C1	−175.98 (12)
C18—N1—C11—C12	98.36 (16)	O1—C9—C10—C11	3.0 (2)
C11—N1—C18—O1	15.8 (2)	C8—C9—C10—C1	2.9 (2)
C11—N1—C18—O2	−165.56 (15)	C8—C9—C10—C11	−178.08 (13)
C6—C1—C2—C3	1.4 (2)	C1—C10—C11—N1	−164.84 (12)
C10—C1—C2—C3	−177.10 (16)	C1—C10—C11—C12	71.56 (17)
C2—C1—C6—C5	−0.1 (2)	C9—C10—C11—N1	16.17 (17)
C2—C1—C6—C7	−179.36 (14)	C9—C10—C11—C12	−107.43 (15)
C10—C1—C6—C5	178.41 (14)	N1—C11—C12—C13	99.58 (17)
C10—C1—C6—C7	−0.9 (2)	N1—C11—C12—C17	−79.96 (17)
C2—C1—C10—C9	176.78 (14)	C10—C11—C12—C13	−137.98 (16)
C2—C1—C10—C11	−2.2 (2)	C10—C11—C12—C17	42.48 (19)
C6—C1—C10—C9	−1.7 (2)	C11—C12—C13—C14	179.58 (17)
C6—C1—C10—C11	179.35 (13)	C17—C12—C13—C14	−0.9 (3)
C1—C2—C3—C4	−1.2 (3)	C11—C12—C17—C16	−179.52 (16)
C2—C3—C4—C5	−0.2 (3)	C13—C12—C17—C16	0.9 (3)
C3—C4—C5—C6	1.5 (3)	C12—C13—C14—C15	−0.1 (3)
C4—C5—C6—C1	−1.3 (3)	C13—C14—C15—C16	0.9 (3)
C4—C5—C6—C7	177.92 (17)	C14—C15—C16—C17	−0.9 (3)
C1—C6—C7—C8	2.3 (2)	C15—C16—C17—C12	−0.1 (3)

Hydrogen-bond geometry (Å, º) top

Cg2 is the centroid of the C1–C6 phenyl ring.

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1···O2ⁱ	0.86	2.07	2.8698 (17)	155
C8—H8···O1ⁱⁱ	0.93	2.58	3.4725 (18)	161
C16—H16···Cg2ⁱⁱⁱ	0.93	2.92	3.722 (2)	145

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

Experimental details

Crystal data
Chemical formula	C₁₈H₁₃NO₂
M_r	275.29
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	296
a, b, c (Å)	11.5625 (4), 16.9228 (5), 7.2394 (2)
β (°)	98.155 (1)
V (Å³)	1402.21 (7)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	0.09
Crystal size (mm)	0.32 × 0.22 × 0.22

Data collection
Diffractometer	Bruker Kappa APEXII CCD diffractometer
Absorption correction	Multi-scan (SADABS; Bruker, 2005)
T_min, T_max	0.980, 0.982
No. of measured, independent and observed [I > 2σ(I)] reflections	9236, 2533, 1961
R_int	0.022
(sin θ/λ)_max (Å⁻¹)	0.600

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.039, 0.111, 1.03
No. of reflections	2533
No. of parameters	190
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.16, −0.15

Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2009), WinGX (Farrugia, 1999) and PLATON (Spek, 2009).

Hydrogen-bond geometry (Å, º) top

Cg2 is the centroid of the C1–C6 phenyl ring.

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1···O2ⁱ	0.86	2.07	2.8698 (17)	155
C8—H8···O1ⁱⁱ	0.93	2.58	3.4725 (18)	161
C16—H16···Cg2ⁱⁱⁱ	0.93	2.92	3.722 (2)	145

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

Acknowledgements

The authors acknowledge the provision of funds for the purchase of the diffractometer and encouragement by Dr Muhammad Akram Chaudhary, Vice Chancellor, University of Sargodha, Pakistan.

References

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Volume 66| Part 10| October 2010| Page o2555

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