organic compounds
2-(2,3-Dimethylphenyl)-1H-isoindole-1,3(2H)-dione
aDepartment of Chemistry, University of Sargodha, Sargodha, Pakistan, and bDepartment of Physics, University of Sargodha, Sargodha, Pakistan
*Correspondence e-mail: dmntahir_uos@yahoo.com
In the title compound, C16H13NO2, the 2,3-dimethylphenyl group and the 1H-isoindole-1,3(2H)-dione group are essentially planar, with r.m.s. deviations of 0.006 and 0.013 Å, respectively, and are oriented at an angle of 78.19 (3)° with respect to each other. In the crystal, weak C—H⋯O interactions link the molecules, forming a zigzag chain parallel to the b axis. Futhermore, C—H⋯π interactions are present between the C—H group of isoindole and the 2,3-dimethylphenyl benzene ring. The H atoms of the ortho-methyl group are statistically disordered over two positions. Such disorder might be related to the antagonism between intramolecular steric repulsions and intermolecular C—H⋯O interactions.
Related literature
For background to ); Chandrashekar et al. (1983); Izotova et al. (2009); Sarfraz et al. (2010); Tahir et al. (2010); Tariq et al. (2010).
containing 2,3-dimethylaniline and for related structures, see: Bocelli & Cantoni (1989Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2009); cell 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
https://doi.org/10.1107/S1600536810033386/dn2596sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810033386/dn2596Isup2.hkl
Equimolar quantities of 2,3-dimethylaniline and phthalic anhydride were refluxed in methanol for 48 h. The solution was kept at room temperature which affoarded white prism after 48 h.
The H-atoms were positioned geometrically (C–H = 0.93–0.96 Å) and refined as riding with Uiso(H) = xUeq(C), where x = 1.5 for methyl and x = 1.2 for aryl H-atoms.
The difference Fourier map showed that H-atoms of ortho-methyl are disordered. They were then geometrically located and treated as riding using the tools (AFIX 123) available in SHELXL97 (Sheldrick, 2008)
We have reported crystal structures of
containing 2,3-dimethylaniline (Sarfraz et al., 2010), (Tahir et al., 2010) and (Tariq et al., 2010). As part of our continuing interest in containing 2,3-dimethylaniline, we report here the structure of the title compound (I).The
of related compounds (II), N-phenylphthalimide (Izotova et al., 2009), (III) N-m-tolylphthalimide (Chandrashekar et al., 1983) and (IV) N-(o-tolyl)phthalimide (Bocelli & Cantoni, 1989) have been already published.In (I), the 2,3-dimethylanilinic moiety A (C1—C8) and the 1H-isoindole-1,3(2H)-dione group B (C9—C15/N1/O1/O2) are planar with r. m. s. deviations of 0.0056 and 0.0131 Å, respectively. The dihedral angle between A/B is 78.19 (3)° (Fig. 1).
The H-atoms of the ortho-methyl group are statistically disordered over two positions. Such disorder might be related to the antagonism between intramolecular C-H···N and intermolecular C-H···O interactions (Table 1). The weak C—H···O interactions links the molecule forming a non continuous zig-zag chain parallel to the b axis owing to the statistical distribution of the H atoms. Weak C-H···π interactions are also present (Table 1, where Cg2 is the centroid of the phenyl ring C1—C6).
For background to
containing 2,3-dimethylaniline and for related structures, see: Bocelli & Cantoni (1989); Chandrashekar et al. (1983); Izotova et al. (2009); Sarfraz et al. (2010); Tahir et al. (2010); Tariq et al. (2010).Data collection: APEX2 (Bruker, 2009); cell
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).Fig. 1. View of the title compound with the atom numbering scheme. The thermal ellipsoids are drawn at the 50% probability level. H-atoms are represented by small circles of arbitrary radii. |
C16H13NO2 | F(000) = 528 |
Mr = 251.27 | Dx = 1.295 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 1819 reflections |
a = 7.8222 (3) Å | θ = 2.6–25.2° |
b = 8.4576 (3) Å | µ = 0.09 mm−1 |
c = 19.4863 (6) Å | T = 296 K |
β = 91.441 (2)° | Prism, white |
V = 1288.75 (8) Å3 | 0.30 × 0.12 × 0.10 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 2320 independent reflections |
Radiation source: fine-focus sealed tube | 1819 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.029 |
Detector resolution: 8.10 pixels mm-1 | θmax = 25.2°, θmin = 2.6° |
ω scans | h = −8→9 |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | k = −10→10 |
Tmin = 0.980, Tmax = 0.993 | l = −23→23 |
9849 measured reflections |
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)] = 0.038 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.097 | H-atom parameters constrained |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0408P)2 + 0.2276P] where P = (Fo2 + 2Fc2)/3 |
2320 reflections | (Δ/σ)max < 0.001 |
173 parameters | Δρmax = 0.13 e Å−3 |
0 restraints | Δρmin = −0.13 e Å−3 |
C16H13NO2 | V = 1288.75 (8) Å3 |
Mr = 251.27 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 7.8222 (3) Å | µ = 0.09 mm−1 |
b = 8.4576 (3) Å | T = 296 K |
c = 19.4863 (6) Å | 0.30 × 0.12 × 0.10 mm |
β = 91.441 (2)° |
Bruker APEXII CCD diffractometer | 2320 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | 1819 reflections with I > 2σ(I) |
Tmin = 0.980, Tmax = 0.993 | Rint = 0.029 |
9849 measured reflections |
R[F2 > 2σ(F2)] = 0.038 | 0 restraints |
wR(F2) = 0.097 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.13 e Å−3 |
2320 reflections | Δρmin = −0.13 e Å−3 |
173 parameters |
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 > 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. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
O1 | 0.49485 (18) | 0.42949 (17) | 0.22907 (6) | 0.0925 (5) | |
O2 | 0.79930 (14) | 0.38827 (14) | 0.03357 (5) | 0.0628 (3) | |
N1 | 0.61379 (16) | 0.38436 (14) | 0.12397 (6) | 0.0490 (3) | |
C1 | 0.49387 (19) | 0.26593 (18) | 0.10015 (7) | 0.0467 (4) | |
C2 | 0.53838 (18) | 0.10792 (18) | 0.10503 (6) | 0.0450 (4) | |
C3 | 0.41581 (19) | −0.00524 (18) | 0.08357 (7) | 0.0489 (4) | |
C4 | 0.2583 (2) | 0.0467 (2) | 0.05916 (7) | 0.0598 (4) | |
H4 | 0.1775 | −0.0278 | 0.0449 | 0.072* | |
C5 | 0.2167 (2) | 0.2044 (2) | 0.05521 (8) | 0.0671 (5) | |
H5 | 0.1092 | 0.2354 | 0.0388 | 0.080* | |
C6 | 0.3357 (2) | 0.3165 (2) | 0.07580 (8) | 0.0579 (4) | |
H6 | 0.3099 | 0.4237 | 0.0733 | 0.069* | |
C7 | 0.7094 (2) | 0.0574 (2) | 0.13251 (8) | 0.0591 (4) | |
H7A | 0.7165 | −0.0559 | 0.1318 | 0.089* | 0.50 |
H7B | 0.7247 | 0.0945 | 0.1788 | 0.089* | 0.50 |
H7C | 0.7970 | 0.1010 | 0.1046 | 0.089* | 0.50 |
H7D | 0.7756 | 0.1490 | 0.1450 | 0.089* | 0.50 |
H7E | 0.7675 | −0.0015 | 0.0980 | 0.089* | 0.50 |
H7F | 0.6951 | −0.0079 | 0.1723 | 0.089* | 0.50 |
C8 | 0.4548 (2) | −0.1781 (2) | 0.08813 (9) | 0.0665 (5) | |
H8A | 0.3620 | −0.2372 | 0.0677 | 0.100* | |
H8B | 0.4697 | −0.2079 | 0.1354 | 0.100* | |
H8C | 0.5579 | −0.2001 | 0.0642 | 0.100* | |
C9 | 0.6040 (2) | 0.45618 (19) | 0.18862 (7) | 0.0555 (4) | |
C10 | 0.75207 (18) | 0.56363 (17) | 0.19457 (7) | 0.0457 (4) | |
C11 | 0.8017 (2) | 0.66315 (19) | 0.24722 (7) | 0.0562 (4) | |
H11 | 0.7393 | 0.6707 | 0.2871 | 0.067* | |
C12 | 0.9479 (2) | 0.7513 (2) | 0.23830 (8) | 0.0622 (4) | |
H12 | 0.9848 | 0.8199 | 0.2729 | 0.075* | |
C13 | 1.0403 (2) | 0.7399 (2) | 0.17923 (9) | 0.0652 (5) | |
H13 | 1.1387 | 0.8005 | 0.1749 | 0.078* | |
C14 | 0.9898 (2) | 0.6399 (2) | 0.12609 (8) | 0.0565 (4) | |
H14 | 1.0520 | 0.6326 | 0.0862 | 0.068* | |
C15 | 0.84406 (18) | 0.55212 (16) | 0.13486 (7) | 0.0432 (3) | |
C16 | 0.75805 (19) | 0.43515 (17) | 0.08932 (7) | 0.0463 (4) |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0969 (10) | 0.1151 (11) | 0.0678 (8) | −0.0452 (9) | 0.0465 (8) | −0.0311 (7) |
O2 | 0.0700 (8) | 0.0772 (8) | 0.0420 (6) | −0.0077 (6) | 0.0174 (5) | −0.0097 (5) |
N1 | 0.0550 (8) | 0.0515 (7) | 0.0412 (6) | −0.0075 (6) | 0.0130 (5) | −0.0041 (5) |
C1 | 0.0521 (9) | 0.0521 (9) | 0.0363 (7) | −0.0015 (7) | 0.0086 (6) | −0.0002 (6) |
C2 | 0.0462 (8) | 0.0558 (9) | 0.0332 (7) | 0.0017 (7) | 0.0064 (6) | 0.0019 (6) |
C3 | 0.0528 (9) | 0.0580 (9) | 0.0364 (7) | −0.0068 (7) | 0.0081 (6) | 0.0004 (6) |
C4 | 0.0569 (10) | 0.0754 (12) | 0.0469 (9) | −0.0121 (9) | 0.0012 (7) | 0.0016 (8) |
C5 | 0.0491 (10) | 0.0938 (14) | 0.0580 (10) | 0.0064 (10) | −0.0028 (8) | 0.0117 (9) |
C6 | 0.0560 (10) | 0.0646 (10) | 0.0532 (9) | 0.0073 (8) | 0.0041 (7) | 0.0079 (8) |
C7 | 0.0575 (10) | 0.0606 (10) | 0.0591 (9) | 0.0025 (8) | 0.0014 (8) | 0.0047 (8) |
C8 | 0.0784 (13) | 0.0584 (10) | 0.0630 (10) | −0.0083 (9) | 0.0117 (9) | −0.0041 (8) |
C9 | 0.0642 (10) | 0.0581 (10) | 0.0450 (8) | −0.0058 (8) | 0.0175 (7) | −0.0056 (7) |
C10 | 0.0514 (9) | 0.0451 (8) | 0.0410 (7) | 0.0039 (7) | 0.0063 (6) | 0.0009 (6) |
C11 | 0.0627 (11) | 0.0614 (10) | 0.0450 (8) | 0.0008 (8) | 0.0077 (7) | −0.0068 (7) |
C12 | 0.0637 (11) | 0.0645 (11) | 0.0581 (10) | −0.0053 (9) | −0.0037 (8) | −0.0118 (8) |
C13 | 0.0554 (10) | 0.0726 (12) | 0.0677 (11) | −0.0122 (9) | 0.0030 (8) | −0.0031 (9) |
C14 | 0.0520 (10) | 0.0662 (10) | 0.0516 (9) | −0.0021 (8) | 0.0103 (7) | 0.0020 (8) |
C15 | 0.0460 (8) | 0.0444 (8) | 0.0394 (7) | 0.0049 (7) | 0.0045 (6) | 0.0039 (6) |
C16 | 0.0507 (9) | 0.0494 (9) | 0.0392 (7) | 0.0038 (7) | 0.0090 (6) | 0.0029 (6) |
O1—C9 | 1.1982 (17) | C7—H7D | 0.9600 |
O2—C16 | 1.2079 (16) | C7—H7E | 0.9600 |
N1—C16 | 1.3972 (17) | C7—H7F | 0.9600 |
N1—C9 | 1.4025 (18) | C8—H8A | 0.9600 |
N1—C1 | 1.4411 (19) | C8—H8B | 0.9600 |
C1—C6 | 1.382 (2) | C8—H8C | 0.9600 |
C1—C2 | 1.384 (2) | C9—C10 | 1.474 (2) |
C2—C3 | 1.411 (2) | C10—C11 | 1.375 (2) |
C2—C7 | 1.491 (2) | C10—C15 | 1.3867 (18) |
C3—C4 | 1.381 (2) | C11—C12 | 1.380 (2) |
C3—C8 | 1.496 (2) | C11—H11 | 0.9300 |
C4—C5 | 1.375 (3) | C12—C13 | 1.378 (2) |
C4—H4 | 0.9300 | C12—H12 | 0.9300 |
C5—C6 | 1.381 (2) | C13—C14 | 1.386 (2) |
C5—H5 | 0.9300 | C13—H13 | 0.9300 |
C6—H6 | 0.9300 | C14—C15 | 1.375 (2) |
C7—H7A | 0.9600 | C14—H14 | 0.9300 |
C7—H7B | 0.9600 | C15—C16 | 1.479 (2) |
C7—H7C | 0.9600 | ||
C16—N1—C9 | 111.33 (12) | C2—C7—H7F | 109.5 |
C16—N1—C1 | 125.81 (11) | H7A—C7—H7F | 56.3 |
C9—N1—C1 | 122.73 (11) | H7B—C7—H7F | 56.3 |
C6—C1—C2 | 122.96 (14) | H7C—C7—H7F | 141.1 |
C6—C1—N1 | 117.74 (14) | H7D—C7—H7F | 109.5 |
C2—C1—N1 | 119.25 (13) | H7E—C7—H7F | 109.5 |
C1—C2—C3 | 117.84 (14) | C3—C8—H8A | 109.5 |
C1—C2—C7 | 121.57 (14) | C3—C8—H8B | 109.5 |
C3—C2—C7 | 120.59 (14) | H8A—C8—H8B | 109.5 |
C4—C3—C2 | 118.69 (15) | C3—C8—H8C | 109.5 |
C4—C3—C8 | 120.68 (15) | H8A—C8—H8C | 109.5 |
C2—C3—C8 | 120.62 (15) | H8B—C8—H8C | 109.5 |
C5—C4—C3 | 122.39 (16) | O1—C9—N1 | 124.41 (15) |
C5—C4—H4 | 118.8 | O1—C9—C10 | 129.49 (14) |
C3—C4—H4 | 118.8 | N1—C9—C10 | 106.09 (11) |
C4—C5—C6 | 119.53 (16) | C11—C10—C15 | 121.76 (14) |
C4—C5—H5 | 120.2 | C11—C10—C9 | 129.95 (13) |
C6—C5—H5 | 120.2 | C15—C10—C9 | 108.29 (12) |
C5—C6—C1 | 118.59 (16) | C10—C11—C12 | 117.11 (14) |
C5—C6—H6 | 120.7 | C10—C11—H11 | 121.4 |
C1—C6—H6 | 120.7 | C12—C11—H11 | 121.4 |
C2—C7—H7A | 109.5 | C13—C12—C11 | 121.42 (15) |
C2—C7—H7B | 109.5 | C13—C12—H12 | 119.3 |
H7A—C7—H7B | 109.5 | C11—C12—H12 | 119.3 |
C2—C7—H7C | 109.5 | C12—C13—C14 | 121.41 (16) |
H7A—C7—H7C | 109.5 | C12—C13—H13 | 119.3 |
H7B—C7—H7C | 109.5 | C14—C13—H13 | 119.3 |
C2—C7—H7D | 109.5 | C15—C14—C13 | 117.26 (14) |
H7A—C7—H7D | 141.1 | C15—C14—H14 | 121.4 |
H7B—C7—H7D | 56.3 | C13—C14—H14 | 121.4 |
H7C—C7—H7D | 56.3 | C14—C15—C10 | 121.05 (13) |
C2—C7—H7E | 109.5 | C14—C15—C16 | 130.74 (12) |
H7A—C7—H7E | 56.3 | C10—C15—C16 | 108.21 (12) |
H7B—C7—H7E | 141.1 | O2—C16—N1 | 124.82 (14) |
H7C—C7—H7E | 56.3 | O2—C16—C15 | 129.14 (13) |
H7D—C7—H7E | 109.5 | N1—C16—C15 | 106.04 (11) |
Cg2 is the centroid of the C1—C6 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7D···N1 | 0.96 | 2.39 | 2.868 (2) | 110 |
C7—H7F···O1i | 0.96 | 2.52 | 3.3486 (19) | 145 |
C8—H8C···Cg2ii | 0.96 | 2.89 | 3.5644 (18) | 128 |
C11—H11···Cg2iii | 0.93 | 2.77 | 3.6798 (15) | 166 |
Symmetry codes: (i) −x+1, y−1/2, −z+1/2; (ii) −x+1, −y, −z; (iii) −x+1, y+1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C16H13NO2 |
Mr | 251.27 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 296 |
a, b, c (Å) | 7.8222 (3), 8.4576 (3), 19.4863 (6) |
β (°) | 91.441 (2) |
V (Å3) | 1288.75 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.30 × 0.12 × 0.10 |
Data collection | |
Diffractometer | Bruker APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2005) |
Tmin, Tmax | 0.980, 0.993 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9849, 2320, 1819 |
Rint | 0.029 |
(sin θ/λ)max (Å−1) | 0.600 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.038, 0.097, 1.04 |
No. of reflections | 2320 |
No. of parameters | 173 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.13, −0.13 |
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).
Cg2 is the centroid of the C1—C6 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7D···N1 | 0.96 | 2.39 | 2.868 (2) | 110.4 |
C7—H7F···O1i | 0.96 | 2.52 | 3.3486 (19) | 145.1 |
C8—H8C···Cg2ii | 0.96 | 2.89 | 3.5644 (18) | 128 |
C11—H11···Cg2iii | 0.93 | 2.77 | 3.6798 (15) | 166 |
Symmetry codes: (i) −x+1, y−1/2, −z+1/2; (ii) −x+1, −y, −z; (iii) −x+1, y+1/2, −z+1/2. |
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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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
We have reported crystal structures of Schiff bases containing 2,3-dimethylaniline (Sarfraz et al., 2010), (Tahir et al., 2010) and (Tariq et al., 2010). As part of our continuing interest in Schiff bases containing 2,3-dimethylaniline, we report here the structure of the title compound (I).
The crystal structure of related compounds (II), N-phenylphthalimide (Izotova et al., 2009), (III) N-m-tolylphthalimide (Chandrashekar et al., 1983) and (IV) N-(o-tolyl)phthalimide (Bocelli & Cantoni, 1989) have been already published.
In (I), the 2,3-dimethylanilinic moiety A (C1—C8) and the 1H-isoindole-1,3(2H)-dione group B (C9—C15/N1/O1/O2) are planar with r. m. s. deviations of 0.0056 and 0.0131 Å, respectively. The dihedral angle between A/B is 78.19 (3)° (Fig. 1).
The H-atoms of the ortho-methyl group are statistically disordered over two positions. Such disorder might be related to the antagonism between intramolecular C-H···N and intermolecular C-H···O interactions (Table 1). The weak C—H···O interactions links the molecule forming a non continuous zig-zag chain parallel to the b axis owing to the statistical distribution of the H atoms. Weak C-H···π interactions are also present (Table 1, where Cg2 is the centroid of the phenyl ring C1—C6).