N-(4-Bromo­phen­yl)-2-(4-chloro­phen­yl)acetamide

The title compound, C₁₄H₁₁BrClNO, consists of chloro­benzene and bromo­benzene units which are linked at either end of the N-methyl­propionamide group. The chloro­benzene unit [maximum deviation = 0.005 (4) Å] makes a dihedral angle of 68.21 (19)° with the bromo­benzene unit [maximum deviation = 0.012 (3) Å]. In the crystal, N—H...O hydrogen bonds link the mol­ecules into chains along [010].

Key indicators

• Single-crystal X-ray study
• T = 296 K
• Mean [sigma](C-C) = 0.006 Å
• R factor = 0.059
• wR factor = 0.166
• Data-to-parameter ratio = 23.2

checkCIF/PLATON results

No syntax errors found



Alert level C
SHFSU01_ALERT_2_C  Test not performed. _refine_ls_shift/su_max and
            _refine_ls_shift/esd_max not present.
            Absolute value of the parameter shift to su ratio given   0.001
PLAT242_ALERT_2_C Check Low       Ueq as Compared to Neighbors for         C7
PLAT334_ALERT_2_C Small Average Benzene  C-C Dist. C1     -C6            1.37 Ang.
PLAT341_ALERT_3_C Low Bond Precision on  C-C Bonds ...............     0.0061 Ang
PLAT352_ALERT_3_C Short   N-H Bond (0.87A)   N1     -   H1N1   ...       0.71 Ang.
PLAT910_ALERT_3_C Missing # of FCF Reflections Below Th(Min) .....          1
PLAT911_ALERT_3_C Missing # FCF Refl Between THmin & STh/L=  0.600          5
PLAT912_ALERT_4_C Missing # of FCF Reflections Above STh/L=  0.600          9
PLAT913_ALERT_3_C Missing # of Very Strong Reflections in FCF ....          1

Alert level G
PLAT005_ALERT_5_G No _iucr_refine_instructions_details in CIF ....          ?
PLAT063_ALERT_4_G Crystal Size Likely too Large for Beam Size ....       0.69 mm
PLAT720_ALERT_4_G Number of Unusual/Non-Standard Labels ..........          1
PLAT960_ALERT_3_G Number of Intensities with I .LT. - 2*sig(I) ...          9

   0 ALERT level A = Most likely a serious problem - resolve or explain
   0 ALERT level B = A potentially serious problem, consider carefully
   9 ALERT level C = Check. Ensure it is not caused by an omission or oversight
   4 ALERT level G = General information/check it is not something unexpected

   0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   3 ALERT type 2 Indicator that the structure model may be wrong or deficient
   6 ALERT type 3 Indicator that the structure quality may be low
   3 ALERT type 4 Improvement, methodology, query or suggestion
   1 ALERT type 5 Informative message, check

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S1. Comment

N-Substituted 2-arylacetamides are very interesting compounds because of their structural similarity to the lateral chain of natural benzylpenicillin (Mijin & Marinkovic, 2006; Mijin et al., 2008). Amides are also used as ligands due to their excellent coordination abilities (Wu et al., 2008, 2010). Crystal structures of some acetamide derivatives viz., N-(4-chloro-1,3-benzothiazol-2-yl)-2-(3-methylphenyl) acetamide monohydrate, N-(3-chloro-4-fluorophenyl)-2,2-diphenylacetamide and N-(3-chloro-4-fluorophenyl)-2-(naphthalen-1-yl)acetamide (Praveen et al., 2011a,b,c) have been reported. In continuation of our work on synthesis of amides (Fun et al., 2011a,b) we report herein the crystal structure of the title compound.

The title compound (Fig. 1), consists of a chlorobenzene (C9–C14/Cl1) and bromobenzene (C1–C6/Br1) moieties which are attached to the N-methylpropionamide (N1/C7–C8/O1) group. The chlorobenzene moiety (maximum deviations of 0.005 (4) at atom C10) makes dihedral angle of 68.21 (19)° with bromobenzene moiety (maximum deviations of 0.012 (3) Å at atom C6). Bond lengths are comparable to those in related structures (Fun et al., 2011a,b).

In the crystal packing (Fig. 2), intermolecular N1—H1N1···O1 hydrogen bonds link the molecules into chains along [010].

Related literature

For the structural similarity of N-substituted 2-arylacetamides to the lateral chain of natural benzylpenicillin, see: Mijin & Marinkovic (2006); Mijin et al. (2008). For the coordination abilities of amides, see: Wu et al. (2008, 2010). For related structures, see: Praveen et al. (2011a,b,c); Fun et al. (2011a,b).

S2. Experimental

4-Chlorophenylacetic acid (0.170g, 1mmol) and 4-bromoaniline (0.172g, 1mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride(1.0g, 0.01mol) and were dissolved in dichloromethane (20mL). The mixture was stirred in presence of triethylamine at 273 K for about 3 h. The contents were poured into 100 ml of ice-cold aqueous hydrochloric acid with stirring, which was extracted thrice with dichloromethane. Organic layer was washed with saturated NaHCO₃ solution and brine solution, dried and concentrated under reduced pressure to give the title compound (I). Single crystals were grown from dichloromethane mixture by the slow evaporation method mp: 439–441 k.

S3. Refinement

N-bound H atom was located in a difference map and were refind freely. [N–H = 0.71 (4) Å] The remaining H atoms were positioned geometrically and were refined with a riding model with U_iso(H) = 1.2 U_eq(C) [C–H = 0.933, 0.9700 Å].

Computing details

Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).

Figures

	Fig. 1. The molecular structure of the title compound, showing 30% probability displacement ellipsoids and the atom numbering scheme.
	Fig. 2. A view of the crystal packing where N1—H1N1···O1 hydrogen bonds (dashed lines) link the molecules into chains along [010]. Hydrogen atoms not involved in hydrogen bonding have been omitted for clarity.

N-(4-Bromophenyl)-2-(4-chlorophenyl)acetamide

Crystal data

C14H11BrClNO	F(000) = 648
Mr = 324.60	Dx = 1.613 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 1975 reflections
a = 15.584 (8) Å	θ = 2.5–24.6°
b = 4.763 (3) Å	µ = 3.26 mm^−1
c = 18.139 (10) Å	T = 296 K
β = 96.984 (11)°	Plate, colourless
V = 1336.5 (12) Å^3	0.69 × 0.19 × 0.06 mm
Z = 4

Data collection

Bruker SMART APEXII CCD area-detector diffractometer	3880 independent reflections
Radiation source: fine-focus sealed tube	1970 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.076
ϕ and ω scans	θmax = 30.0°, θmin = 2.3°
Absorption correction: multi-scan (SADABS; Bruker, 2009)	h = −21→21
Tmin = 0.211, Tmax = 0.826	k = −6→6
12836 measured reflections	l = −25→24

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.059	Hydrogen site location: inferred from neighbouring sites
wR(F^2) = 0.166	H atoms treated by a mixture of independent and constrained refinement
S = 1.03	w = 1/[σ^2(Fo^2) + (0.P)^2 + 0.5271P] where P = (Fo^2 + 2Fc^2)/3
3880 reflections	(Δ/σ)max < 0.001
167 parameters	Δρmax = 0.52 e Å^−3
0 restraints	Δρmin = −0.54 e Å^−3

Special details

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 > 2sigma(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
Br1	0.28762 (3)	0.70007 (12)	0.35364 (3)	0.0891 (3)
O1	−0.1362 (2)	0.6167 (5)	0.3893 (3)	0.1018 (14)
N1	−0.0827 (2)	1.0487 (6)	0.37965 (19)	0.0562 (9)
Cl1	−0.52585 (7)	0.1650 (2)	0.38444 (7)	0.0663 (3)
C1	0.0462 (3)	0.7777 (7)	0.4237 (2)	0.0594 (10)
H1A	0.0171	0.6980	0.4604	0.071*
C2	0.1300 (3)	0.7001 (8)	0.4179 (2)	0.0607 (10)
H2A	0.1574	0.5677	0.4504	0.073*
C3	0.1732 (3)	0.8182 (8)	0.3642 (2)	0.0573 (9)
C4	0.1331 (3)	1.0177 (8)	0.3172 (2)	0.0667 (11)
H4A	0.1627	1.1011	0.2814	0.080*
C5	0.0495 (3)	1.0933 (8)	0.3232 (3)	0.0652 (11)
H5A	0.0226	1.2285	0.2914	0.078*
C6	0.0047 (2)	0.9718 (6)	0.3758 (2)	0.0471 (8)
C7	−0.1479 (3)	0.8708 (6)	0.3853 (2)	0.0597 (10)
C8	−0.2359 (3)	1.0010 (7)	0.3854 (3)	0.0756 (14)
H8A	−0.2475	1.1210	0.3421	0.091*
H8B	−0.2354	1.1186	0.4291	0.091*
C9	−0.3081 (3)	0.7905 (7)	0.3849 (3)	0.0626 (12)
C10	−0.3510 (3)	0.6898 (7)	0.3188 (3)	0.0634 (11)
H10A	−0.3350	0.7532	0.2740	0.076*
C11	−0.4175 (3)	0.4957 (7)	0.3185 (2)	0.0578 (9)
H11A	−0.4465	0.4305	0.2739	0.069*
C12	−0.4396 (2)	0.4024 (7)	0.3850 (2)	0.0491 (9)
C13	−0.3986 (3)	0.4935 (8)	0.4515 (2)	0.0577 (9)
H13A	−0.4145	0.4264	0.4960	0.069*
C14	−0.3332 (3)	0.6879 (8)	0.4508 (3)	0.0625 (11)
H14A	−0.3049	0.7522	0.4957	0.075*
H1N1	−0.087 (3)	1.197 (8)	0.376 (2)	0.058 (12)*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Br1	0.0498 (3)	0.1141 (5)	0.1047 (5)	0.0028 (2)	0.0147 (3)	−0.0110 (3)
O1	0.0549 (17)	0.0276 (11)	0.223 (4)	0.0063 (11)	0.018 (2)	−0.0026 (17)
N1	0.055 (2)	0.0268 (13)	0.086 (2)	0.0063 (12)	0.0059 (17)	−0.0021 (13)
Cl1	0.0496 (6)	0.0703 (6)	0.0804 (8)	−0.0048 (4)	0.0137 (5)	−0.0103 (5)
C1	0.059 (2)	0.0541 (19)	0.067 (3)	0.0103 (16)	0.011 (2)	0.0114 (17)
C2	0.057 (2)	0.060 (2)	0.065 (3)	0.0104 (17)	0.004 (2)	0.0087 (18)
C3	0.048 (2)	0.058 (2)	0.065 (3)	−0.0049 (16)	0.005 (2)	−0.0097 (18)
C4	0.062 (3)	0.073 (2)	0.066 (3)	−0.014 (2)	0.013 (2)	0.012 (2)
C5	0.064 (3)	0.0519 (19)	0.076 (3)	−0.0053 (18)	−0.004 (2)	0.0184 (18)
C6	0.0466 (19)	0.0307 (14)	0.063 (2)	0.0002 (13)	0.0010 (17)	−0.0045 (14)
C7	0.055 (2)	0.0294 (14)	0.094 (3)	0.0085 (14)	0.006 (2)	−0.0064 (16)
C8	0.052 (2)	0.0350 (16)	0.140 (4)	0.0064 (15)	0.011 (3)	−0.009 (2)
C9	0.047 (2)	0.0377 (16)	0.102 (4)	0.0123 (14)	0.006 (2)	−0.0054 (18)
C10	0.070 (3)	0.0524 (19)	0.069 (3)	0.0048 (18)	0.010 (2)	0.0058 (18)
C11	0.058 (2)	0.057 (2)	0.058 (2)	0.0030 (17)	0.0024 (19)	−0.0067 (17)
C12	0.0416 (19)	0.0458 (17)	0.060 (2)	0.0098 (14)	0.0067 (18)	−0.0048 (15)
C13	0.050 (2)	0.068 (2)	0.054 (2)	0.0101 (17)	0.0044 (18)	−0.0076 (18)
C14	0.055 (2)	0.060 (2)	0.070 (3)	0.0101 (18)	−0.003 (2)	−0.0201 (19)

Geometric parameters (Å, º)

Br1—C3	1.902 (4)	C5—H5A	0.9300
O1—C7	1.225 (4)	C7—C8	1.506 (5)
N1—C7	1.337 (5)	C8—C9	1.506 (5)
N1—C6	1.421 (5)	C8—H8A	0.9700
N1—H1N1	0.71 (4)	C8—H8B	0.9700
Cl1—C12	1.756 (4)	C9—C10	1.384 (6)
C1—C2	1.374 (6)	C9—C14	1.391 (6)
C1—C6	1.374 (5)	C10—C11	1.388 (6)
C1—H1A	0.9300	C10—H10A	0.9300
C2—C3	1.370 (6)	C11—C12	1.369 (5)
C2—H2A	0.9300	C11—H11A	0.9300
C3—C4	1.376 (6)	C12—C13	1.364 (5)
C4—C5	1.369 (6)	C13—C14	1.379 (6)
C4—H4A	0.9300	C13—H13A	0.9300
C5—C6	1.376 (5)	C14—H14A	0.9300
C7—N1—C6	125.6 (3)	C7—C8—C9	113.9 (3)
C7—N1—H1N1	125 (4)	C7—C8—H8A	108.8
C6—N1—H1N1	109 (4)	C9—C8—H8A	108.8
C2—C1—C6	120.7 (4)	C7—C8—H8B	108.8
C2—C1—H1A	119.6	C9—C8—H8B	108.8
C6—C1—H1A	119.6	H8A—C8—H8B	107.7
C3—C2—C1	119.8 (4)	C10—C9—C14	117.7 (4)
C3—C2—H2A	120.1	C10—C9—C8	121.2 (4)
C1—C2—H2A	120.1	C14—C9—C8	121.1 (4)
C2—C3—C4	120.0 (4)	C9—C10—C11	121.1 (4)
C2—C3—Br1	119.9 (3)	C9—C10—H10A	119.4
C4—C3—Br1	120.2 (3)	C11—C10—H10A	119.4
C5—C4—C3	119.8 (4)	C12—C11—C10	118.6 (4)
C5—C4—H4A	120.1	C12—C11—H11A	120.7
C3—C4—H4A	120.1	C10—C11—H11A	120.7
C4—C5—C6	120.8 (4)	C13—C12—C11	122.4 (4)
C4—C5—H5A	119.6	C13—C12—Cl1	119.1 (3)
C6—C5—H5A	119.6	C11—C12—Cl1	118.6 (3)
C1—C6—C5	118.8 (4)	C12—C13—C14	118.2 (4)
C1—C6—N1	121.5 (3)	C12—C13—H13A	120.9
C5—C6—N1	119.7 (3)	C14—C13—H13A	120.9
O1—C7—N1	121.5 (3)	C13—C14—C9	122.0 (4)
O1—C7—C8	122.4 (3)	C13—C14—H14A	119.0
N1—C7—C8	116.1 (3)	C9—C14—H14A	119.0
C6—C1—C2—C3	0.4 (6)	O1—C7—C8—C9	−4.4 (7)
C1—C2—C3—C4	1.2 (6)	N1—C7—C8—C9	174.7 (4)
C1—C2—C3—Br1	−177.5 (3)	C7—C8—C9—C10	−89.3 (5)
C2—C3—C4—C5	−1.4 (6)	C7—C8—C9—C14	89.9 (5)
Br1—C3—C4—C5	177.3 (3)	C14—C9—C10—C11	0.8 (5)
C3—C4—C5—C6	−0.1 (6)	C8—C9—C10—C11	180.0 (3)
C2—C1—C6—C5	−1.8 (6)	C9—C10—C11—C12	−0.7 (5)
C2—C1—C6—N1	178.2 (3)	C10—C11—C12—C13	0.1 (5)
C4—C5—C6—C1	1.7 (6)	C10—C11—C12—Cl1	178.1 (3)
C4—C5—C6—N1	−178.4 (4)	C11—C12—C13—C14	0.4 (5)
C7—N1—C6—C1	−46.6 (6)	Cl1—C12—C13—C14	−177.6 (3)
C7—N1—C6—C5	133.5 (4)	C12—C13—C14—C9	−0.3 (5)
C6—N1—C7—O1	1.5 (7)	C10—C9—C14—C13	−0.3 (5)
C6—N1—C7—C8	−177.6 (4)	C8—C9—C14—C13	−179.5 (3)

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1N1···O1^i	0.71 (4)	2.17 (4)	2.843 (4)	160 (5)

Symmetry code: (i) x, y+1, z.