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organic compounds\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 67| Part 11| November 2011| Page o2893
doi:10.1107/S1600536811040980

2,4-Di­chloro-N-(2,3-di­chloro­phen­yl)benzene­sulfonamide

Vinola Z. Rodrigues,a Sabine Forob and B. Thimme Gowdaa*

aDepartment of Chemistry, Mangalore University, Mangalagangotri 574 199, Mangalore, India, and bInstitute of Materials Science, Darmstadt University of Technology, Petersenstrasse 23, D-64287 Darmstadt, Germany
*Correspondence e-mail: gowdabt@yahoo.com

(Received 3 October 2011; accepted 5 October 2011; online 8 October 2011)

In the title compound, C12H7Cl4NO2S, the conformation of the N—C bond in the C—SO2—NH—C segment is gauche with respect to the S=O bonds. Further, the N—H bond in the C—SO2—NH—C segment is syn with respect to the ortho-Cl atoms in the aniline and sulfonyl benzene rings. The C—SO2—NH—C torsion angle is −51.98 (18)°. The sulfonyl and aniline benzene rings are tilted by 67.7 (1)° relative to each other. An intra­molecular N—H⋯Cl hydrogen bond occurs.

Related literature

For the preparation of the title compound, see: Savitha & Gowda (2006[Savitha, M. B. & Gowda, B. T. (2006). Z. Naturforsch. Teil A, 61, 600-606.]). For hydrogen-bonding modes of sulfonamides, see: Adsmond & Grant (2001[Adsmond, D. A. & Grant, D. J. W. (2001). J. Pharm. Sci. 90, 2058-2077.]). For studies on the effects of substituents on the structures and other aspects of N-(ar­yl)-amides, see: Bhat & Gowda (2000[Bhat, D. K. & Gowda, B. T. (2000). J. Indian Chem. Soc. 77, 279-284.]), on N-(ar­yl)-methane­sulfonamides, see: Gowda et al. (2007[Gowda, B. T., Foro, S. & Fuess, H. (2007). Acta Cryst. E63, o2570.]), on N-(ar­yl)-aryl­sulfon­amides, see: Gelbrich et al. (2007[Gelbrich, T., Hursthouse, M. B. & Threlfall, T. L. (2007). Acta Cryst. B63, 621-632.]); Perlovich et al. (2006[Perlovich, G. L., Tkachev, V. V., Schaper, K.-J. & Raevsky, O. A. (2006). Acta Cryst. E62, o780-o782.]); Gowda et al. (2009[Gowda, B. T., Foro, S., Nirmala, P. G. & Fuess, H. (2009). Acta Cryst. E65, o1940.]); Shetty & Gowda (2005[Shetty, M. & Gowda, B. T. (2005). Z. Naturforsch. Teil A, 60, 113-120.]) and on N-(chloro)-aryl­sulfonamides, see: Gowda et al. (2003[Gowda, B. T. & Kumar, B. H. A. (2003). Oxid. Commun. A, 26, 403-425.]).

[Scheme 1]

Experimental

Crystal data

  • C12H7Cl4NO2S

  • Mr = 371.05

  • Monoclinic, P 21 /c

  • a = 9.0756 (6) Å

  • b = 9.7406 (7) Å

  • c = 16.432 (1) Å

  • β = 98.157 (6)°

  • V = 1437.92 (17) Å3

  • Z = 4

  • Mo Kα radiation

  • μ = 0.97 mm−1

  • T = 293 K

  • 0.48 × 0.48 × 0.40 mm
Data collection

  • Oxford Diffraction Xcalibur diffractometer with a Sapphire CCD detector

  • Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2009[Oxford Diffraction (2009). CrysAlis CCD and CrysAlis RED. Oxford Diffraction Ltd, Yarnton, England.]) Tmin = 0.654, Tmax = 0.699

  • 5584 measured reflections

  • 2929 independent reflections

  • 2377 reflections with I > 2σ(I)

  • Rint = 0.011
Refinement

  • R[F2 > 2σ(F2)] = 0.031

  • wR(F2) = 0.085

  • S = 1.06

  • 2929 reflections

  • 184 parameters

  • 1 restraint

  • H atoms treated by a mixture of independent and constrained refinement

  • Δρmax = 0.35 e Å−3

  • Δρmin = −0.33 e Å−3

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A D⋯A D—H⋯A
N1—H1N⋯Cl3 0.83 (2) 2.47 (2) 2.9526 (19) 118 (2)

Data collection: CrysAlis CCD (Oxford Diffraction, 2009[Oxford Diffraction (2009). CrysAlis CCD and CrysAlis RED. Oxford Diffraction Ltd, Yarnton, England.]); cell refinement: CrysAlis RED (Oxford Diffraction, 2009[Oxford Diffraction (2009). CrysAlis CCD and CrysAlis RED. Oxford Diffraction Ltd, Yarnton, England.]); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); molecular graphics: PLATON (Spek, 2009[Spek, A. L. (2009). Acta Cryst. D65, 148-155.]); software used to prepare material for publication: SHELXL97.

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536811040980/ds2148sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536811040980/ds2148Isup2.hkl

Supporting information file. DOI: 10.1107/S1600536811040980/ds2148Isup3.cml

checkCIF report


Comment top

The sulfonamide moiety is the constituent of many biologically important compounds. The hydrogen bonding preferences of sulfonamides have been investigated (Adsmond & Grant, 2001). As part of our studies on the substituent effects on the structures and other aspects of N-(aryl)-amides (Bhat & Gowda, 2000), N-(aryl)-methanesulfonamides (Gowda et al., 2007), N-(aryl)-arylsulfonamides (Gowda et al., 2009; Shetty & Gowda, 2005) and N-(chloro)-arylsulfonamides (Gowda et al., 2003), in the present work, the crystal structure of 2,4-Dichloro-N-(2,3-dichlorophenyl)benzenesulfonamide (I) has been determined (Fig. 1).

In (I), the conformations of the N—C bond in the C—SO2—NH—C segment is gauche to the S═O bonds. Further, the N—H bond in the C—SO2—NH—C segment is syn with respect to the ortho-Cl atoms in the anilino and sulfonyl benzene rings. The molecule is bent at the S atom with the C—SO2—NH—C torsion angle of -52.0 (2)°, compared to the value of -48.2 (2)° in 2,4-Dichloro-N-(3,4-dichlorophenyl)benzenesulfonamide (II) (Gowda et al., 2009).

The sulfonyl and the aniline benzene rings are tilted relative to each other by 67.7 (1)°, compared to the value of 68.9 (1)° in (II).

The other bond parameters in (I) are similar to those observed in (II) and other aryl sulfonamides (Perlovich et al., 2006; Gelbrich et al., 2007).

The crystal structure exhibits N—H···Cl intramolecular hydrogen bonding. Part of the crystal structure is shown in Fig. 2.

Related literature top

For the preparation of the title compound, see: Savitha & Gowda (2006). For hydrogen-bonding modes of sulfonamides, see: Adsmond & Grant (2001). For studies on the effects of substituents on the structures and other aspects of N-(aryl)-amides, see: Bhat & Gowda (2000), on N-(aryl)-methanesulfonamides, see: Gowda et al. (2007), on N-(aryl)-arylsulfonamides, see: Gelbrich et al. (2007); Perlovich et al. (2006); Gowda et al. (2009); Shetty & Gowda (2005) and on N-(chloro)-arylsulfonamides, see: Gowda et al. (2003).

Experimental top

The solution of 1,3-dichlorobenzene (10 ml) in chloroform (40 ml) was treated dropwise with chlorosulfonic acid (25 ml) at 0 ° C. After the initial evolution of hydrogen chloride subsided, the reaction mixture was brought to room temperature and poured into crushed ice in a beaker. The chloroform layer was separated, washed with cold water and allowed to evaporate slowly. The residual 2,4-dichlorobenzenesulfonylchloride was treated with 2,3-dichloroaniline in the stoichiometric ratio and boiled for ten minutes. The reaction mixture was then cooled to room temperature and added to ice cold water (100 ml). The resultant solid 2,4-dichloro-N-(2,3-dichlorophenyl)benzenesulfonamide was filtered under suction and washed thoroughly with cold water. It was then recrystallized to constant melting point from dilute ethanol. The purity of the compound was checked and characterized by recording its infrared and NMR spectra (Savitha & Gowda, 2006).

Prism like light pink single crystals used in X-ray diffraction studies were grown in ethanolic solution by slow evaporation at room temperature.

Refinement top

The H atoms of the NH groups were located in a difference map and later restrained to N—H = 0.86 (2) Å. The other H atoms were positioned with idealized geometry using a riding model with the aromatic C—H = 0.93Å and methyl C—H = 0.96 Å. All H atoms were refined with isotropic displacement parameters. The Uiso(H) values were set at 1.2Ueq(C-aromatic, N) and 1.5Ueq(C-methyl).

Computing details top

Data collection: CrysAlis CCD (Oxford Diffraction, 2009); cell refinement: CrysAlis RED (Oxford Diffraction, 2009); data reduction: CrysAlis RED (Oxford Diffraction, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. Molecular structure of the title compound, showing the atom labelling scheme and displacement ellipsoids are drawn at the 50% probability level.
[Figure 2] Fig. 2. Molecular packing of (I) with hydrogen bonding shown as dashed lines.
2,4-Dichloro-N-(2,3-dichlorophenyl)benzenesulfonamide top
Crystal data top
C12H7Cl4NO2SF(000) = 744
Mr = 371.05Dx = 1.714 Mg m−3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 2527 reflections
a = 9.0756 (6) Åθ = 3.1–27.7°
b = 9.7406 (7) ŵ = 0.97 mm−1
c = 16.432 (1) ÅT = 293 K
β = 98.157 (6)°Prism, light pink
V = 1437.92 (17) Å30.48 × 0.48 × 0.40 mm
Z = 4
Data collection top
Oxford Diffraction Xcalibur
diffractometer with a Sapphire CCD detector		2929 independent reflections
Radiation source: fine-focus sealed tube2377 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.011
Rotation method data acquisition using ω scansθmax = 26.4°, θmin = 3.1°
Absorption correction: multi-scan
(CrysAlis RED; Oxford Diffraction, 2009)		h = −11→11
Tmin = 0.654, Tmax = 0.699k = −12→6
5584 measured reflectionsl = −20→7
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)] = 0.031Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.085H atoms treated by a mixture of independent and constrained refinement
S = 1.06 w = 1/[σ2(Fo2) + (0.0428P)2 + 0.4988P]
where P = (Fo2 + 2Fc2)/3
2929 reflections(Δ/σ)max < 0.001
184 parametersΔρmax = 0.35 e Å−3
1 restraintΔρmin = −0.33 e Å−3
Crystal data top
C12H7Cl4NO2SV = 1437.92 (17) Å3
Mr = 371.05Z = 4
Monoclinic, P21/cMo Kα radiation
a = 9.0756 (6) ŵ = 0.97 mm−1
b = 9.7406 (7) ÅT = 293 K
c = 16.432 (1) Å0.48 × 0.48 × 0.40 mm
β = 98.157 (6)°
Data collection top
Oxford Diffraction Xcalibur
diffractometer with a Sapphire CCD detector		2929 independent reflections
Absorption correction: multi-scan
(CrysAlis RED; Oxford Diffraction, 2009)		2377 reflections with I > 2σ(I)
Tmin = 0.654, Tmax = 0.699Rint = 0.011
5584 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0311 restraint
wR(F2) = 0.085H atoms treated by a mixture of independent and constrained refinement
S = 1.06Δρmax = 0.35 e Å−3
2929 reflectionsΔρmin = −0.33 e Å−3
184 parameters
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
Cl11.01332 (7)0.16349 (7)0.03990 (4)0.06229 (19)
Cl20.68073 (12)0.57632 (9)−0.09497 (6)0.0992 (3)
Cl30.75598 (6)−0.10291 (6)0.09622 (4)0.05174 (16)
Cl40.41139 (7)−0.13998 (7)0.06337 (4)0.06117 (19)
S10.94908 (5)0.25929 (6)0.22226 (3)0.03991 (14)
O10.90401 (17)0.33724 (18)0.28772 (9)0.0522 (4)
O21.10217 (15)0.22678 (18)0.22388 (10)0.0533 (4)
N10.86340 (18)0.11137 (19)0.21735 (11)0.0407 (4)
H1N0.907 (2)0.052 (2)0.1941 (13)0.049*
C10.8791 (2)0.3472 (2)0.13079 (12)0.0381 (4)
C20.9078 (2)0.3066 (2)0.05351 (13)0.0420 (5)
C30.8482 (3)0.3780 (2)−0.01612 (14)0.0518 (6)
H30.86920.3517−0.06770.062*
C40.7580 (3)0.4880 (3)−0.00799 (15)0.0581 (6)
C50.7266 (3)0.5302 (3)0.06718 (18)0.0644 (7)
H50.66460.60510.07140.077*
C60.7884 (3)0.4598 (2)0.13660 (15)0.0521 (6)
H60.76880.48840.18800.063*
C70.7057 (2)0.0989 (2)0.20112 (11)0.0348 (4)
C80.6430 (2)−0.0002 (2)0.14600 (11)0.0357 (4)
C90.4892 (2)−0.0153 (2)0.13160 (12)0.0408 (5)
C100.3983 (2)0.0671 (3)0.16999 (14)0.0497 (6)
H100.29550.05700.15940.060*
C110.4611 (2)0.1651 (3)0.22439 (15)0.0520 (6)
H110.39980.22170.25060.062*
C120.6134 (2)0.1808 (2)0.24075 (14)0.0464 (5)
H120.65420.24650.27840.056*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Cl10.0608 (4)0.0666 (4)0.0633 (4)0.0104 (3)0.0221 (3)−0.0190 (3)
Cl20.1211 (7)0.0792 (6)0.0854 (6)−0.0130 (5)−0.0259 (5)0.0308 (4)
Cl30.0468 (3)0.0479 (3)0.0614 (4)0.0047 (2)0.0107 (2)−0.0119 (3)
Cl40.0561 (3)0.0688 (4)0.0549 (3)−0.0229 (3)−0.0052 (3)0.0012 (3)
S10.0291 (2)0.0476 (3)0.0424 (3)−0.0015 (2)0.00272 (19)−0.0094 (2)
O10.0480 (9)0.0646 (11)0.0438 (8)−0.0037 (8)0.0059 (7)−0.0187 (8)
O20.0271 (7)0.0690 (11)0.0625 (10)−0.0014 (7)0.0024 (6)−0.0085 (8)
N10.0285 (8)0.0427 (10)0.0509 (10)0.0034 (7)0.0062 (7)−0.0019 (8)
C10.0331 (10)0.0361 (10)0.0454 (11)−0.0060 (8)0.0062 (8)−0.0092 (9)
C20.0360 (10)0.0416 (11)0.0493 (11)−0.0095 (9)0.0091 (9)−0.0104 (10)
C30.0543 (13)0.0543 (14)0.0466 (13)−0.0207 (11)0.0062 (10)−0.0030 (11)
C40.0650 (15)0.0444 (13)0.0601 (15)−0.0169 (12)−0.0079 (12)0.0059 (12)
C50.0662 (16)0.0376 (13)0.0855 (19)0.0047 (11)−0.0028 (14)−0.0026 (13)
C60.0571 (14)0.0413 (12)0.0579 (13)0.0037 (10)0.0076 (11)−0.0120 (11)
C70.0292 (9)0.0391 (11)0.0364 (10)0.0017 (8)0.0056 (8)0.0047 (8)
C80.0351 (10)0.0364 (10)0.0363 (10)0.0029 (8)0.0077 (8)0.0078 (8)
C90.0356 (10)0.0461 (12)0.0395 (10)−0.0064 (9)0.0012 (8)0.0114 (9)
C100.0267 (10)0.0639 (15)0.0591 (14)0.0009 (10)0.0081 (9)0.0148 (12)
C110.0362 (11)0.0587 (15)0.0649 (15)0.0070 (10)0.0203 (10)0.0001 (12)
C120.0405 (11)0.0502 (13)0.0505 (12)0.0005 (10)0.0135 (9)−0.0053 (10)
Geometric parameters (Å, º) top
Cl1—C21.723 (2)C3—H30.9300
Cl2—C41.729 (2)C4—C51.370 (4)
Cl3—C81.720 (2)C5—C61.380 (3)
Cl4—C91.734 (2)C5—H50.9300
S1—O21.4216 (15)C6—H60.9300
S1—O11.4232 (15)C7—C121.384 (3)
S1—N11.6338 (18)C7—C81.389 (3)
S1—C11.768 (2)C8—C91.390 (3)
N1—C71.424 (2)C9—C101.368 (3)
N1—H1N0.825 (16)C10—C111.375 (3)
C1—C61.383 (3)C10—H100.9300
C1—C21.390 (3)C11—C121.379 (3)
C2—C31.382 (3)C11—H110.9300
C3—C41.366 (4)C12—H120.9300
O2—S1—O1119.32 (9)C6—C5—H5120.5
O2—S1—N1105.16 (10)C5—C6—C1120.9 (2)
O1—S1—N1108.79 (10)C5—C6—H6119.6
O2—S1—C1110.86 (10)C1—C6—H6119.6
O1—S1—C1106.09 (10)C12—C7—C8119.22 (18)
N1—S1—C1105.90 (9)C12—C7—N1121.45 (18)
C7—N1—S1122.92 (14)C8—C7—N1119.31 (17)
C7—N1—H1N112.9 (17)C7—C8—C9119.53 (18)
S1—N1—H1N112.7 (17)C7—C8—Cl3119.83 (14)
C6—C1—C2118.7 (2)C9—C8—Cl3120.64 (16)
C6—C1—S1118.10 (16)C10—C9—C8121.1 (2)
C2—C1—S1123.21 (16)C10—C9—Cl4119.52 (16)
C3—C2—C1120.7 (2)C8—C9—Cl4119.40 (17)
C3—C2—Cl1117.35 (17)C9—C10—C11119.09 (19)
C1—C2—Cl1121.91 (17)C9—C10—H10120.5
C4—C3—C2118.9 (2)C11—C10—H10120.5
C4—C3—H3120.5C10—C11—C12121.0 (2)
C2—C3—H3120.5C10—C11—H11119.5
C3—C4—C5121.9 (2)C12—C11—H11119.5
C3—C4—Cl2119.2 (2)C11—C12—C7120.1 (2)
C5—C4—Cl2119.0 (2)C11—C12—H12120.0
C4—C5—C6119.0 (2)C7—C12—H12120.0
C4—C5—H5120.5
O2—S1—N1—C7−169.42 (16)C4—C5—C6—C1−0.9 (4)
O1—S1—N1—C761.68 (19)C2—C1—C6—C50.4 (3)
C1—S1—N1—C7−51.98 (18)S1—C1—C6—C5−178.02 (19)
O2—S1—C1—C6−136.46 (17)S1—N1—C7—C12−45.7 (3)
O1—S1—C1—C6−5.5 (2)S1—N1—C7—C8136.06 (17)
N1—S1—C1—C6109.99 (18)C12—C7—C8—C90.0 (3)
O2—S1—C1—C245.2 (2)N1—C7—C8—C9178.29 (18)
O1—S1—C1—C2176.12 (16)C12—C7—C8—Cl3−179.99 (16)
N1—S1—C1—C2−68.37 (19)N1—C7—C8—Cl3−1.8 (3)
C6—C1—C2—C30.7 (3)C7—C8—C9—C100.9 (3)
S1—C1—C2—C3179.01 (16)Cl3—C8—C9—C10−179.07 (16)
C6—C1—C2—Cl1−177.34 (17)C7—C8—C9—Cl4−179.51 (15)
S1—C1—C2—Cl11.0 (3)Cl3—C8—C9—Cl40.5 (2)
C1—C2—C3—C4−1.3 (3)C8—C9—C10—C11−0.8 (3)
Cl1—C2—C3—C4176.82 (17)Cl4—C9—C10—C11179.58 (17)
C2—C3—C4—C50.8 (4)C9—C10—C11—C12−0.2 (3)
C2—C3—C4—Cl2−179.01 (17)C10—C11—C12—C71.1 (4)
C3—C4—C5—C60.2 (4)C8—C7—C12—C11−1.0 (3)
Cl2—C4—C5—C6−179.9 (2)N1—C7—C12—C11−179.2 (2)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N1—H1N···Cl30.83 (2)2.47 (2)2.9526 (19)118 (2)

Experimental details

Crystal data
Chemical formulaC12H7Cl4NO2S
Mr371.05
Crystal system, space groupMonoclinic, P21/c
Temperature (K)293
a, b, c (Å)9.0756 (6), 9.7406 (7), 16.432 (1)
β (°) 98.157 (6)
V (Å3)1437.92 (17)
Z4
Radiation typeMo Kα
µ (mm−1)0.97
Crystal size (mm)0.48 × 0.48 × 0.40
Data collection
DiffractometerOxford Diffraction Xcalibur
diffractometer with a Sapphire CCD detector
Absorption correctionMulti-scan
(CrysAlis RED; Oxford Diffraction, 2009)
Tmin, Tmax0.654, 0.699
No. of measured, independent and
observed [I > 2σ(I)] reflections		5584, 2929, 2377
Rint0.011
(sin θ/λ)max (Å−1)0.625
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.031, 0.085, 1.06
No. of reflections2929
No. of parameters184
No. of restraints1
H-atom treatmentH atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)0.35, −0.33

Computer programs: CrysAlis CCD (Oxford Diffraction, 2009), CrysAlis RED (Oxford Diffraction, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009).

Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N1—H1N···Cl30.825 (16)2.47 (2)2.9526 (19)118.1 (19)
 

Acknowledgements

VZR thanks the University Grants Commission, Government of India, New Delhi, for the award of an RFSMS fellowship.

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ISSN: 2056-9890
Volume 67| Part 11| November 2011| Page o2893
doi:10.1107/S1600536811040980
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