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The conformation of the N-H bond in the structure of the title compound (23DCPA), C8H7Cl2NO, is syn to either the ortho or meta chloro substituent. The geometric parameters of 23DCPA are similar to related amides. The amide H atom is simultaneously involved in an intramolecular hydrogen bond with the ortho Cl atom and an intermolecular hydrogen bond with the O atom of the carbonyl group.
Supporting information
CCDC reference: 613376
Key indicators
- Single-crystal X-ray study
- T = 299 K
- Mean (C-C) = 0.005 Å
- R factor = 0.041
- wR factor = 0.102
- Data-to-parameter ratio = 13.8
checkCIF/PLATON results
No syntax errors found
Alert level C
PLAT062_ALERT_4_C Rescale T(min) & T(max) by ..................... 1.24
PLAT152_ALERT_1_C Supplied and Calc Volume s.u. Inconsistent ..... ?
PLAT340_ALERT_3_C Low Bond Precision on C-C bonds (x 1000) Ang ... 5
Alert level G
ABSTM02_ALERT_3_G When printed, the submitted absorption T values will be
replaced by the scaled T values. Since the ratio of scaled T's
is identical to the ratio of reported T values, the scaling
does not imply a change to the absorption corrections used in
the study.
Ratio of Tmax expected/reported 1.239
Tmax scaled 0.778 Tmin scaled 0.601
0 ALERT level A = In general: serious problem
0 ALERT level B = Potentially serious problem
3 ALERT level C = Check and explain
1 ALERT level G = General alerts; check
1 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
0 ALERT type 2 Indicator that the structure model may be wrong or deficient
2 ALERT type 3 Indicator that the structure quality may be low
1 ALERT type 4 Improvement, methodology, query or suggestion
0 ALERT type 5 Informative message, check
Data collection: CAD-4-PC (Enraf–Nonius, 1996); cell refinement: CAD-4-PC; data reduction: REDU4 (Stoe & Cie, 1987); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: PLATON (Spek, 2003) and ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: SHELXL97.
N-(2,3-dichlorophenyl)acetamide
top
Crystal data top
C8H7Cl2NO | F(000) = 416 |
Mr = 204.05 | Dx = 1.557 Mg m−3 |
Monoclinic, P21/c | Cu Kα radiation, λ = 1.54180 Å |
Hall symbol: -P 2ybc | Cell parameters from 25 reflections |
a = 4.7524 (5) Å | θ = 4.7–24.3° |
b = 12.246 (1) Å | µ = 6.29 mm−1 |
c = 15.140 (1) Å | T = 299 K |
β = 98.915 (7)° | Needle, colourless |
V = 870.5 (1) Å3 | 0.28 × 0.06 × 0.04 mm |
Z = 4 | |
Data collection top
Enraf–Nonius CAD-4 diffractometer | 1072 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.033 |
Graphite monochromator | θmax = 66.9°, θmin = 4.7° |
ω/2θ scans | h = 0→5 |
Absorption correction: ψ scan (North et al., 1968) | k = −14→1 |
Tmin = 0.485, Tmax = 0.627 | l = −18→17 |
1923 measured reflections | 3 standard reflections every 120 min |
1560 independent reflections | intensity decay: 4.3% |
Refinement top
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.041 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.102 | w = 1/[σ2(Fo2) + (0.0415P)2 + 0.0972P] where P = (Fo2 + 2Fc2)/3 |
S = 1.06 | (Δ/σ)max = 0.002 |
1560 reflections | Δρmax = 0.27 e Å−3 |
113 parameters | Δρmin = −0.24 e Å−3 |
1 restraint | Extinction correction: SHELXL97, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0062 (6) |
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 | |
C1 | 0.0128 (7) | −0.3229 (3) | −0.0294 (2) | 0.0495 (9) | |
H1A | −0.0168 | −0.3908 | −0.0006 | 0.059* | |
H1B | 0.2123 | −0.3134 | −0.0312 | 0.059* | |
H1C | −0.0898 | −0.3236 | −0.0893 | 0.059* | |
C2 | −0.0917 (7) | −0.2313 (3) | 0.0215 (2) | 0.0404 (8) | |
C5 | 0.0701 (6) | −0.0852 (3) | 0.1298 (2) | 0.0359 (7) | |
C6 | 0.2434 (6) | −0.0729 (3) | 0.2121 (2) | 0.0358 (7) | |
C7 | 0.2093 (8) | 0.0171 (3) | 0.2651 (2) | 0.0425 (8) | |
C8 | 0.0025 (8) | 0.0941 (3) | 0.2378 (2) | 0.0510 (9) | |
H8 | −0.0199 | 0.1542 | 0.2737 | 0.061* | |
C9 | −0.1704 (8) | 0.0808 (3) | 0.1567 (3) | 0.0523 (9) | |
H9 | −0.3120 | 0.1319 | 0.1382 | 0.063* | |
C10 | −0.1366 (7) | −0.0070 (3) | 0.1027 (2) | 0.0443 (8) | |
H10 | −0.2532 | −0.0141 | 0.0477 | 0.053* | |
N4 | 0.1139 (5) | −0.1758 (2) | 0.07566 (18) | 0.0389 (6) | |
H4N | 0.286 (3) | −0.197 (3) | 0.079 (2) | 0.047* | |
O3 | −0.3435 (5) | −0.2085 (2) | 0.01501 (18) | 0.0601 (8) | |
Cl11 | 0.49749 (19) | −0.17057 (7) | 0.24850 (6) | 0.0466 (3) | |
Cl12 | 0.4238 (2) | 0.03476 (8) | 0.36764 (6) | 0.0625 (3) | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
C1 | 0.0390 (19) | 0.055 (2) | 0.053 (2) | −0.0027 (18) | 0.0024 (16) | −0.0118 (18) |
C2 | 0.0310 (17) | 0.048 (2) | 0.0413 (18) | −0.0029 (15) | 0.0018 (14) | 0.0052 (15) |
C5 | 0.0319 (16) | 0.0365 (16) | 0.0401 (16) | −0.0003 (15) | 0.0074 (13) | 0.0003 (15) |
C6 | 0.0311 (16) | 0.0354 (17) | 0.0416 (17) | −0.0012 (14) | 0.0081 (13) | 0.0036 (14) |
C7 | 0.0440 (19) | 0.043 (2) | 0.0417 (18) | −0.0076 (16) | 0.0102 (15) | −0.0009 (15) |
C8 | 0.055 (2) | 0.041 (2) | 0.061 (2) | 0.0029 (19) | 0.0212 (18) | −0.0035 (17) |
C9 | 0.047 (2) | 0.044 (2) | 0.069 (2) | 0.0127 (18) | 0.0208 (18) | 0.0090 (19) |
C10 | 0.0368 (19) | 0.051 (2) | 0.0444 (18) | 0.0086 (16) | 0.0054 (15) | 0.0074 (16) |
N4 | 0.0231 (13) | 0.0485 (16) | 0.0432 (15) | 0.0051 (13) | −0.0008 (11) | −0.0042 (13) |
O3 | 0.0255 (13) | 0.0772 (19) | 0.0760 (19) | −0.0016 (12) | 0.0026 (12) | −0.0145 (15) |
Cl11 | 0.0419 (4) | 0.0454 (4) | 0.0487 (5) | 0.0050 (4) | −0.0052 (3) | 0.0029 (4) |
Cl12 | 0.0705 (7) | 0.0662 (6) | 0.0486 (5) | −0.0100 (5) | 0.0022 (4) | −0.0136 (5) |
Geometric parameters (Å, º) top
C1—C2 | 1.490 (5) | C6—Cl11 | 1.728 (3) |
C1—H1A | 0.9600 | C7—C8 | 1.379 (5) |
C1—H1B | 0.9600 | C7—Cl12 | 1.734 (3) |
C1—H1C | 0.9600 | C8—C9 | 1.377 (5) |
C2—O3 | 1.217 (4) | C8—H8 | 0.9300 |
C2—N4 | 1.357 (4) | C9—C10 | 1.376 (5) |
C5—C10 | 1.387 (4) | C9—H9 | 0.9300 |
C5—C6 | 1.391 (4) | C10—H10 | 0.9300 |
C5—N4 | 1.414 (4) | N4—H4N | 0.850 (10) |
C6—C7 | 1.387 (4) | | |
| | | |
C2—C1—H1A | 109.5 | C8—C7—C6 | 120.8 (3) |
C2—C1—H1B | 109.5 | C8—C7—Cl12 | 118.4 (3) |
H1A—C1—H1B | 109.5 | C6—C7—Cl12 | 120.8 (3) |
C2—C1—H1C | 109.5 | C9—C8—C7 | 119.0 (3) |
H1A—C1—H1C | 109.5 | C9—C8—H8 | 120.5 |
H1B—C1—H1C | 109.5 | C7—C8—H8 | 120.5 |
O3—C2—N4 | 122.7 (3) | C10—C9—C8 | 120.9 (3) |
O3—C2—C1 | 122.2 (3) | C10—C9—H9 | 119.5 |
N4—C2—C1 | 115.0 (3) | C8—C9—H9 | 119.5 |
C10—C5—C6 | 119.0 (3) | C9—C10—C5 | 120.4 (3) |
C10—C5—N4 | 122.1 (3) | C9—C10—H10 | 119.8 |
C6—C5—N4 | 119.0 (3) | C5—C10—H10 | 119.8 |
C7—C6—C5 | 119.9 (3) | C2—N4—C5 | 125.9 (3) |
C7—C6—Cl11 | 120.3 (3) | C2—N4—H4N | 119 (2) |
C5—C6—Cl11 | 119.9 (2) | C5—N4—H4N | 115 (2) |
| | | |
C10—C5—C6—C7 | −0.7 (5) | Cl12—C7—C8—C9 | −179.6 (3) |
N4—C5—C6—C7 | 178.1 (3) | C7—C8—C9—C10 | −0.8 (6) |
C10—C5—C6—Cl11 | 178.6 (2) | C8—C9—C10—C5 | 1.1 (5) |
N4—C5—C6—Cl11 | −2.6 (4) | C6—C5—C10—C9 | −0.3 (5) |
C5—C6—C7—C8 | 1.0 (5) | N4—C5—C10—C9 | −179.1 (3) |
Cl11—C6—C7—C8 | −178.3 (3) | O3—C2—N4—C5 | −1.1 (5) |
C5—C6—C7—Cl12 | −179.6 (2) | C1—C2—N4—C5 | 179.2 (3) |
Cl11—C6—C7—Cl12 | 1.1 (4) | C10—C5—N4—C2 | −36.0 (5) |
C6—C7—C8—C9 | −0.2 (5) | C6—C5—N4—C2 | 145.3 (3) |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N4—H4N···Cl11 | 0.85 (1) | 2.63 (3) | 2.949 (3) | 104 (2) |
N4—H4N···O3i | 0.85 (1) | 2.14 (2) | 2.896 (4) | 148 (3) |
Symmetry code: (i) x+1, y, z. |
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