N,N′-Diphenyl­suberamide

Abstract

In the title compound (systematic name: N,N′-diphenyl­octanediamide), C₂₀H₂₄N₂O₂, the two phenyl rings make an inter­planar angle of 76.5 (2)°. The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds, which link the mol­ecules into chains running along the b axis. The crystal studied was non-merohedrally twinned, the fractional contribution of the minor twin component being 0.203 (2).

Related literature

For related structures, see: Gowda et al. (2007 ▶, 2009a ▶,b ▶).

Experimental

Crystal data

• C₂₀H₂₄N₂O₂

• M _r = 324.41

• Monoclinic,

• a = 18.2267 (9) Å

• b = 5.03097 (15) Å

• c = 38.1436 (15) Å

• β = 96.517 (4)°

• V = 3475.1 (2) ų

• Z = 8

• Mo Kα radiation

• μ = 0.08 mm⁻¹

• T = 295 K

• 0.58 × 0.33 × 0.05 mm

Data collection

• Oxford Diffraction Gemini R CCD diffractometer

• Absorption correction: analytical (CrysAlis PRO; Oxford Diffraction, 2009 ▶) T _min = 0.957, T _max = 0.996

• 27788 measured reflections

• 3027 independent reflections

• 2524 reflections with I > 2σ(I)

• R _int = 0.064

Refinement

• R[F ² > 2σ(F ²)] = 0.076

• wR(F ²) = 0.203

• S = 1.09

• 3027 reflections

• 224 parameters

• 2 restraints

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

• Δρ_max = 0.21 e Å⁻³

• Δρ_min = −0.22 e Å⁻³

Data collection: CrysAlis PRO (Oxford Diffraction, 2009 ▶); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: ORTEP-3 (Farrugia, 1997 ▶) and DIAMOND (Brandenburg, 2002 ▶); software used to prepare material for publication: SHELXL97, PLATON (Spek, 2009 ▶) and WinGX (Farrugia, 1999 ▶).

Supplementary Material

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Table 1. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O1i	0.84 (3)	2.17 (3)	3.004 (4)	173 (4)
N2—H2N⋯O2ii	0.84 (3)	2.13 (3)	2.937 (4)	161 (4)

Symmetry codes: (i) ; (ii) .

supplementary crystallographic information

Comment

The amide moiety is an important constituent of many biologically significant compounds. As a part of studying the effect of ring and side chain substitutions on the structures of this class of compounds (Gowda et al., 2007; 2009a,b), the crystal structure of N,N-bis(phenyl)-suberamide has been determined (I) (Fig. 1).

In the structure, the two phenyl rings make an interplanar angle of 76.5 (2)°. The plane of the aliphatic group C2/C7 makes dihedral angles of 26.3 (5)° with the amide group (N1, H1N, C1, O1) and 27.2 (5)° with the amide group (N2, H2N, C8, O2). The conformations of the amide groups with respect to the attached phenyl rings are given by the torsion angles of C14—C9—N1—C1 = -38.0 (6)° and C16—C15—N2—C8 = -42.2 (6)°. The structure is stabilized by two intramolecular hydrogen bonds (Table 1). The intermolecular N–H···O hydrogen bonds link the molecules into the chains running along the b-axis of the crystal (Fig. 2). The crystal is merohedrally twinned with the twin fraction of 0.203 (2).

Experimental

Suberic acid (0.3 mol) was heated with thionyl chloride (1.2 mol) at 120°C for 4 hours. The acid chloride obtained was treated with aniline (0.6 mol). The product obtained was added to crushed ice to obtain the white precipitate. It was thoroughly washed with water and then with saturated sodium bicarbonate solution and washed again with water. It was then given a wash with 2 N HCl. It was again washed with water, filtered, dried and recrystallised to constant point (186-188°C) from ethanol-Tetrahydrofuran mixture in the ratio 1:4.

Plate like colourless single crystals of the title compound used in X-ray diffraction studies were obtained by a slow evaporation of its solution at room temperature.

Refinement

The crystal used for data collection was a non-merohedral twin. The twin law was found to be a twofold axis about the [1 0 4] direct lattice direction. The final refinement was made using the HKLF4 format of the HKL file, and using the INS file having the twin matrix (-1 0 0 / 0 -1 0 / 0.5 0 1) in the TWIN instruction. The fractional contribution of the minor twin component refined to 0.203 (2). The C-bounded hydrogen atoms were positioned with idealized geometry using a riding model with C–H = 0.93 Å or 0.97 Å. Amide H atoms were refined with N–H distance restrained to 0.85 (3) Å. The U_iso(H) values were set at 1.2U_eq(C, N).

Figures

Fig. 1.

Molecular structure of (I) showing the atom labelling scheme. Displacement ellipsoids are drawn at the 30% probability level and H atoms are represented as small spheres of arbitrary radii.

Fig. 2.

Part of crystal structure of (I) viewed down the a-axis. Intermolecular N–H···O hydrogen bonds (shown as dashed lines) connect the molecules into chains running along the b-axis of the crystal. Symmetry codes (i): x, y-1, z; (ii): x, y+1, z.

Crystal data

C20H24N2O2	F(000) = 1392
Mr = 324.41	Dx = 1.24 Mg m−3
Monoclinic, C2/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2yc	Cell parameters from 7864 reflections
a = 18.2267 (9) Å	θ = 1.9–27.4°
b = 5.03097 (15) Å	µ = 0.08 mm−1
c = 38.1436 (15) Å	T = 295 K
β = 96.517 (4)°	Plate, colourless
V = 3475.1 (2) Å3	0.58 × 0.33 × 0.05 mm
Z = 8

Data collection

Oxford Diffraction Gemini R CCD diffractometer	3027 independent reflections
graphite	2524 reflections with I > 2σ(I)
Detector resolution: 10.434 pixels mm-1	Rint = 0.064
ω scans	θmax = 25.0°, θmin = 2.2°
Absorption correction: analytical (CrysAlis PRO; Oxford Diffraction, 2009)	h = −21→21
Tmin = 0.957, Tmax = 0.996	k = −5→5
27788 measured reflections	l = −45→45

Refinement

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)] = 0.076	Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.203	H atoms treated by a mixture of independent and constrained refinement
S = 1.09	w = 1/[σ2(Fo2) + (0.0865P)2 + 8.373P] where P = (Fo2 + 2Fc2)/3
3027 reflections	(Δ/σ)max < 0.001
224 parameters	Δρmax = 0.21 e Å−3
2 restraints	Δρmin = −0.22 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 > 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 (Ų)

	x	y	z	Uiso*/Ueq
C1	0.0479 (2)	0.3940 (7)	0.55627 (10)	0.0357 (9)
C2	0.0772 (2)	0.2805 (8)	0.52403 (10)	0.0392 (9)
H2A	0.0358	0.2378	0.5067	0.047*
H2B	0.1029	0.1158	0.5306	0.047*
C3	0.1291 (2)	0.4621 (8)	0.50714 (10)	0.0398 (9)
H3A	0.1732	0.489	0.5235	0.048*
H3B	0.1055	0.6337	0.5028	0.048*
C4	0.1511 (2)	0.3560 (8)	0.47276 (10)	0.0398 (9)
H4A	0.1068	0.3257	0.4567	0.048*
H4B	0.1754	0.1857	0.4772	0.048*
C5	0.2020 (2)	0.5373 (8)	0.45507 (9)	0.0415 (10)
H5A	0.247	0.5627	0.4709	0.05*
H5B	0.1784	0.7095	0.4514	0.05*
C6	0.2222 (2)	0.4363 (8)	0.42003 (10)	0.0417 (10)
H6A	0.2457	0.2638	0.4235	0.05*
H6B	0.1775	0.4133	0.404	0.05*
C7	0.2735 (2)	0.6215 (8)	0.40346 (10)	0.0416 (10)
H7A	0.3186	0.6418	0.4194	0.05*
H7B	0.2505	0.795	0.4004	0.05*
C8	0.2930 (2)	0.5254 (7)	0.36811 (10)	0.0388 (9)
C9	−0.0140 (2)	0.2611 (7)	0.60821 (9)	0.0343 (8)
C10	−0.0691 (2)	0.0877 (9)	0.61530 (10)	0.0459 (10)
H10	−0.0822	−0.0522	0.5999	0.055*
C11	−0.1051 (3)	0.1199 (10)	0.64514 (11)	0.0565 (12)
H11	−0.1425	0.0034	0.6497	0.068*
C12	−0.0851 (3)	0.3247 (10)	0.66783 (11)	0.0595 (13)
H12	−0.109	0.3482	0.6879	0.071*
C13	−0.0299 (3)	0.4945 (9)	0.66109 (10)	0.0574 (12)
H13	−0.0168	0.633	0.6767	0.069*
C14	0.0070 (2)	0.4649 (8)	0.63144 (10)	0.0439 (10)
H14	0.0451	0.5798	0.6273	0.053*
C15	0.3338 (2)	0.6863 (7)	0.31213 (10)	0.0382 (9)
C16	0.3837 (2)	0.4959 (9)	0.30577 (11)	0.0517 (11)
H16	0.401	0.3772	0.3235	0.062*
C17	0.4088 (3)	0.4791 (11)	0.27288 (13)	0.0676 (14)
H17	0.4425	0.3479	0.2685	0.081*
C18	0.3837 (3)	0.6570 (11)	0.24667 (12)	0.0695 (15)
H18	0.4011	0.6476	0.2247	0.083*
C19	0.3336 (3)	0.8462 (11)	0.25299 (13)	0.0738 (16)
H19	0.3157	0.9633	0.2352	0.089*
C20	0.3091 (3)	0.8644 (9)	0.28602 (12)	0.0565 (12)
H20	0.2759	0.9971	0.2905	0.068*
N1	0.02190 (19)	0.2112 (6)	0.57763 (8)	0.0381 (8)
H1N	0.029 (2)	0.055 (6)	0.5713 (11)	0.046*
N2	0.3100 (2)	0.7191 (6)	0.34624 (9)	0.0405 (8)
H2N	0.302 (2)	0.868 (6)	0.3547 (11)	0.049*
O1	0.04456 (18)	0.6348 (5)	0.56139 (8)	0.0503 (8)
O2	0.2948 (2)	0.2890 (6)	0.36057 (9)	0.0652 (10)

Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
C1	0.041 (2)	0.029 (2)	0.038 (2)	0.0025 (17)	0.0096 (17)	−0.0019 (17)
C2	0.050 (2)	0.032 (2)	0.038 (2)	−0.0012 (18)	0.0144 (18)	−0.0054 (17)
C3	0.046 (2)	0.037 (2)	0.038 (2)	−0.0056 (18)	0.0141 (17)	−0.0075 (17)
C4	0.044 (2)	0.038 (2)	0.039 (2)	−0.0018 (18)	0.0125 (17)	−0.0048 (17)
C5	0.052 (2)	0.038 (2)	0.037 (2)	−0.0057 (19)	0.0163 (18)	−0.0080 (18)
C6	0.055 (2)	0.031 (2)	0.042 (2)	−0.0081 (18)	0.0166 (19)	−0.0062 (17)
C7	0.051 (2)	0.033 (2)	0.042 (2)	−0.0046 (19)	0.0131 (19)	−0.0038 (18)
C8	0.050 (2)	0.026 (2)	0.044 (2)	−0.0011 (18)	0.0215 (19)	−0.0072 (17)
C9	0.039 (2)	0.0295 (19)	0.0347 (19)	0.0036 (17)	0.0069 (16)	0.0021 (15)
C10	0.057 (3)	0.043 (2)	0.039 (2)	−0.007 (2)	0.0131 (19)	−0.0037 (18)
C11	0.060 (3)	0.058 (3)	0.056 (3)	0.002 (2)	0.029 (2)	0.011 (2)
C12	0.079 (3)	0.062 (3)	0.042 (2)	0.013 (3)	0.030 (2)	0.005 (2)
C13	0.089 (3)	0.047 (3)	0.037 (2)	0.005 (3)	0.011 (2)	−0.009 (2)
C14	0.051 (2)	0.040 (2)	0.041 (2)	−0.0034 (19)	0.0109 (19)	−0.0051 (19)
C15	0.046 (2)	0.030 (2)	0.041 (2)	−0.0092 (17)	0.0134 (18)	−0.0034 (17)
C16	0.060 (3)	0.049 (2)	0.050 (2)	0.008 (2)	0.021 (2)	0.002 (2)
C17	0.081 (3)	0.060 (3)	0.070 (3)	0.005 (3)	0.042 (3)	−0.009 (3)
C18	0.102 (4)	0.066 (3)	0.046 (3)	−0.018 (3)	0.035 (3)	−0.009 (3)
C19	0.113 (5)	0.063 (3)	0.047 (3)	−0.005 (3)	0.019 (3)	0.013 (3)
C20	0.072 (3)	0.042 (3)	0.058 (3)	0.002 (2)	0.017 (2)	0.004 (2)
N1	0.0527 (19)	0.0262 (16)	0.0384 (17)	−0.0009 (15)	0.0174 (15)	−0.0018 (14)
N2	0.054 (2)	0.0263 (17)	0.0446 (19)	−0.0037 (15)	0.0198 (16)	−0.0016 (15)
O1	0.072 (2)	0.0293 (15)	0.0548 (18)	0.0002 (14)	0.0316 (16)	−0.0006 (13)
O2	0.110 (3)	0.0280 (16)	0.067 (2)	−0.0056 (17)	0.051 (2)	−0.0043 (14)

Geometric parameters (Å, °)

C1—O1	1.229 (5)	C9—N1	1.423 (5)
C1—N1	1.350 (5)	C10—C11	1.386 (6)
C1—C2	1.508 (5)	C10—H10	0.93
C2—C3	1.510 (5)	C11—C12	1.368 (7)
C2—H2A	0.97	C11—H11	0.93
C2—H2B	0.97	C12—C13	1.366 (7)
C3—C4	1.512 (5)	C12—H12	0.93
C3—H3A	0.97	C13—C14	1.388 (6)
C3—H3B	0.97	C13—H13	0.93
C4—C5	1.513 (5)	C14—H14	0.93
C4—H4A	0.97	C15—C16	1.362 (6)
C4—H4B	0.97	C15—C20	1.377 (6)
C5—C6	1.514 (5)	C15—N2	1.427 (5)
C5—H5A	0.97	C16—C17	1.385 (6)
C5—H5B	0.97	C16—H16	0.93
C6—C7	1.509 (5)	C17—C18	1.381 (7)
C6—H6A	0.97	C17—H17	0.93
C6—H6B	0.97	C18—C19	1.360 (8)
C7—C8	1.512 (5)	C18—H18	0.93
C7—H7A	0.97	C19—C20	1.387 (7)
C7—H7B	0.97	C19—H19	0.93
C8—O2	1.225 (5)	C20—H20	0.93
C8—N2	1.342 (5)	N1—H1N	0.84 (3)
C9—C10	1.380 (6)	N2—H2N	0.84 (3)
C9—C14	1.381 (5)
O1—C1—N1	123.3 (3)	C10—C9—C14	119.9 (3)
O1—C1—C2	122.1 (3)	C10—C9—N1	117.5 (3)
N1—C1—C2	114.5 (3)	C14—C9—N1	122.5 (3)
C1—C2—C3	114.6 (3)	C9—C10—C11	120.7 (4)
C1—C2—H2A	108.6	C9—C10—H10	119.7
C3—C2—H2A	108.6	C11—C10—H10	119.7
C1—C2—H2B	108.6	C12—C11—C10	119.3 (4)
C3—C2—H2B	108.6	C12—C11—H11	120.3
H2A—C2—H2B	107.6	C10—C11—H11	120.3
C2—C3—C4	113.4 (3)	C13—C12—C11	120.1 (4)
C2—C3—H3A	108.9	C13—C12—H12	119.9
C4—C3—H3A	108.9	C11—C12—H12	119.9
C2—C3—H3B	108.9	C12—C13—C14	121.4 (4)
C4—C3—H3B	108.9	C12—C13—H13	119.3
H3A—C3—H3B	107.7	C14—C13—H13	119.3
C3—C4—C5	114.2 (3)	C9—C14—C13	118.5 (4)
C3—C4—H4A	108.7	C9—C14—H14	120.7
C5—C4—H4A	108.7	C13—C14—H14	120.7
C3—C4—H4B	108.7	C16—C15—C20	120.0 (4)
C5—C4—H4B	108.7	C16—C15—N2	121.5 (4)
H4A—C4—H4B	107.6	C20—C15—N2	118.4 (4)
C4—C5—C6	114.5 (3)	C15—C16—C17	120.0 (4)
C4—C5—H5A	108.6	C15—C16—H16	120
C6—C5—H5A	108.6	C17—C16—H16	120
C4—C5—H5B	108.6	C18—C17—C16	120.0 (5)
C6—C5—H5B	108.6	C18—C17—H17	120
H5A—C5—H5B	107.6	C16—C17—H17	120
C7—C6—C5	112.8 (3)	C19—C18—C17	119.9 (4)
C7—C6—H6A	109	C19—C18—H18	120
C5—C6—H6A	109	C17—C18—H18	120
C7—C6—H6B	109	C18—C19—C20	120.0 (5)
C5—C6—H6B	109	C18—C19—H19	120
H6A—C6—H6B	107.8	C20—C19—H19	120
C6—C7—C8	113.3 (3)	C15—C20—C19	120.1 (5)
C6—C7—H7A	108.9	C15—C20—H20	119.9
C8—C7—H7A	108.9	C19—C20—H20	119.9
C6—C7—H7B	108.9	C1—N1—C9	126.9 (3)
C8—C7—H7B	108.9	C1—N1—H1N	113 (3)
H7A—C7—H7B	107.7	C9—N1—H1N	120 (3)
O2—C8—N2	123.0 (4)	C8—N2—C15	126.8 (3)
O2—C8—C7	122.3 (4)	C8—N2—H2N	110 (3)
N2—C8—C7	114.6 (3)	C15—N2—H2N	123 (3)
O1—C1—C2—C3	23.9 (6)	C20—C15—C16—C17	−0.9 (7)
N1—C1—C2—C3	−159.8 (3)	N2—C15—C16—C17	−176.4 (4)
C1—C2—C3—C4	−173.8 (3)	C15—C16—C17—C18	0.7 (8)
C2—C3—C4—C5	179.0 (4)	C16—C17—C18—C19	−1.0 (8)
C3—C4—C5—C6	−178.1 (4)	C17—C18—C19—C20	1.7 (8)
C4—C5—C6—C7	−179.4 (4)	C16—C15—C20—C19	1.5 (7)
C5—C6—C7—C8	−178.9 (4)	N2—C15—C20—C19	177.1 (4)
C6—C7—C8—O2	−29.1 (6)	C18—C19—C20—C15	−1.9 (8)
C6—C7—C8—N2	152.7 (4)	O1—C1—N1—C9	1.5 (7)
C14—C9—C10—C11	1.7 (6)	C2—C1—N1—C9	−174.8 (4)
N1—C9—C10—C11	178.2 (4)	C10—C9—N1—C1	145.5 (4)
C9—C10—C11—C12	−0.6 (7)	C14—C9—N1—C1	−38.0 (6)
C10—C11—C12—C13	−0.2 (7)	O2—C8—N2—C15	−1.4 (7)
C11—C12—C13—C14	0.0 (7)	C7—C8—N2—C15	176.8 (4)
C10—C9—C14—C13	−2.0 (6)	C16—C15—N2—C8	−42.2 (6)
N1—C9—C14—C13	−178.3 (4)	C20—C15—N2—C8	142.3 (4)
C12—C13—C14—C9	1.1 (7)

Hydrogen-bond geometry (Å, °)

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1N···O1i	0.84 (3)	2.17 (3)	3.004 (4)	173 (4)
N2—H2N···O2ii	0.84 (3)	2.13 (3)	2.937 (4)	161 (4)

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