organic compounds
Dimethyl 2-aminobiphenyl-4,4′-dicarboxylate
aDepartment of Chemistry and Biochemistry, University of Massachusetts Dartmouth, 285 Old Westport Road, North Dartmouth, MA 02747, USA, and bDepartment of Chemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
*Correspondence e-mail: dmanke@umassd.edu
The title compound, C16H15NO4, exhibits two near-planar aromatic ester groups with a maximum aryl–ester torsion angle of 1.9 (2)°. The dihedral angle between the benzene rings is 44.7 (1)°. In the crystal, N—H⋯O hydrogen bonding is observed along with C—H⋯O contacts, forming chanins along [101]. No π–π interactions were noted between the benzene rings.
Related literature
For the synthesis of the title compound, see: Olkhovik et al. (2008). For the crystal structures of the parent dimethyl-4,4′-dicarboxylate and its structurally characterized amino derivatives, see: Ritzerfeld et al. (2009); Nyburg et al. (1988). For metal-organic framework structures with this and related linkers, see: Deshpande et al. (2010); Lun et al. (2011); Gupta et al. (2012); Sudik et al. (2005).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2005); cell SAINT (Bruker, 2005); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536813010775/ff2103sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536813010775/ff2103Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536813010775/ff2103Isup3.cml
The compound was prepared by literature procedure (Olkhovik et al. 2008). Crystals suitable for single-crystal X-ray analysis were grown by slow evaporation of an ethanol solution.
All non-hydrogen atoms were refined anisotropically (SHELXL) by full matrix least squares on F2. Hydrogen atoms H1NA and H1NB were found from a Fourier difference map and were refined with fixed distance of 0.87 (005) Å and isotropic displacement parameter of 1.20 times Ueq of parent N atom. All other hydrogen atoms were placed in calculated positions and then refined with riding model with C—H lengths of 0.95 Å for (CH) and 0.98 Å for (CH3) and with isotropic displacement parameters set to 1.20 and 1.50 times Ueq of the parent C atom.
Biphenyl-4,4'-dicarboxylate and its derivatives are widely used in metal-organic (MOFs) frameworks as linkers (Sudik et al. 2005). One of the many advantages of MOFs is the ability to incorporate different functional groups within their pores. An area of interest is the inclusion of open
sites on the interior surfaces of MOFs. As a part of our efforts in this field, we prepared the previously reported dimethyl-2-aminobiphenyl-4,4'-dicarboxylate (Olkhovik et al. 2008) and report its structure herein.The molecular structure of the title compound is shown in Figure 1. The two phenyl rings demonstrate a dihedral angle of 135.3°. In the crystal, intermolecular hydrogen bonding is observed between N1–H1NA···O4 and N1H1NB···O2. There is also a close C–H···O contact along C4H4A···O2. No π-π interactions were noted between the phenyl rings. The packing for the title compound indicating hydrogen bonding is shown in Figure 2.
For the synthesis of the title compound, see: Olkhovik et al. (2008). For the crystal structures of the parent dimethyl-4,4'-dicarboxylate and its structurally characterized amino derivatives, see: Ritzerfeld et al. (2009); Nyburg et al. (1988). For metal-organic framework structures with this and related linkers, see: Deshpande et al. (2010); Lun et al. (2011); Gupta et al. (2012); Sudik et al. (2005).
Data collection: APEX2 (Bruker, 2005); cell
SAINT (Bruker, 2005); data reduction: SAINT (Bruker, 2005); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. Molecular structure of the title compound, showing the atom labelling scheme. Displacement ellipsoids are drawn at the 50% probability level. H atoms are presented as spheres of arbitrary radius. | |
Fig. 2. Molecular packing of the title compound with hydrogen bonding shown as dashed lines. |
C16H15NO4 | F(000) = 600 |
Mr = 285.29 | Dx = 1.418 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 2401 reflections |
a = 12.955 (3) Å | θ = 2.9–24.9° |
b = 7.3460 (16) Å | µ = 0.10 mm−1 |
c = 14.422 (3) Å | T = 90 K |
β = 103.263 (10)° | Plate, colourless |
V = 1336.0 (5) Å3 | 0.28 × 0.12 × 0.06 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 2463 independent reflections |
Radiation source: fine-focus sealed tube | 1785 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.036 |
φ and ω scans | θmax = 25.5°, θmin = 3.0° |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | h = −15→15 |
Tmin = 0.972, Tmax = 0.994 | k = −8→8 |
9113 measured reflections | l = −17→17 |
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)] = 0.045 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.124 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.01 | w = 1/[σ2(Fo2) + (0.0609P)2 + 0.6328P] where P = (Fo2 + 2Fc2)/3 |
2463 reflections | (Δ/σ)max < 0.001 |
198 parameters | Δρmax = 0.27 e Å−3 |
2 restraints | Δρmin = −0.35 e Å−3 |
C16H15NO4 | V = 1336.0 (5) Å3 |
Mr = 285.29 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 12.955 (3) Å | µ = 0.10 mm−1 |
b = 7.3460 (16) Å | T = 90 K |
c = 14.422 (3) Å | 0.28 × 0.12 × 0.06 mm |
β = 103.263 (10)° |
Bruker APEXII CCD diffractometer | 2463 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | 1785 reflections with I > 2σ(I) |
Tmin = 0.972, Tmax = 0.994 | Rint = 0.036 |
9113 measured reflections |
R[F2 > 2σ(F2)] = 0.045 | 2 restraints |
wR(F2) = 0.124 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.01 | Δρmax = 0.27 e Å−3 |
2463 reflections | Δρmin = −0.35 e Å−3 |
198 parameters |
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. |
x | y | z | Uiso*/Ueq | ||
O1 | 0.06313 (12) | 0.5135 (2) | −0.10419 (10) | 0.0276 (4) | |
O2 | −0.00179 (13) | 0.7915 (2) | −0.09219 (11) | 0.0351 (4) | |
O3 | 0.71122 (11) | 0.6353 (2) | 0.53463 (9) | 0.0237 (4) | |
O4 | 0.61240 (12) | 0.7629 (2) | 0.62568 (10) | 0.0280 (4) | |
N1 | 0.22094 (16) | 1.0226 (3) | 0.21975 (14) | 0.0321 (5) | |
H1NB | 0.1839 (17) | 1.109 (2) | 0.1855 (15) | 0.038* | |
H1NA | 0.2785 (12) | 1.051 (3) | 0.2629 (13) | 0.038* | |
C1 | −0.00925 (17) | 0.4946 (3) | −0.19589 (14) | 0.0277 (5) | |
H1C | −0.0122 | 0.3668 | −0.2157 | 0.042* | |
H1B | 0.0153 | 0.5695 | −0.2428 | 0.042* | |
H1A | −0.0801 | 0.5349 | −0.1915 | 0.042* | |
C2 | 0.06020 (17) | 0.6717 (3) | −0.05967 (15) | 0.0215 (5) | |
C3 | 0.14017 (16) | 0.6815 (3) | 0.03194 (14) | 0.0201 (5) | |
C4 | 0.14580 (16) | 0.8404 (3) | 0.08492 (14) | 0.0205 (5) | |
H4A | 0.0976 | 0.9367 | 0.0624 | 0.025* | |
C5 | 0.22104 (16) | 0.8614 (3) | 0.17076 (14) | 0.0190 (5) | |
C6 | 0.29167 (16) | 0.7167 (3) | 0.20412 (14) | 0.0181 (5) | |
C7 | 0.28276 (16) | 0.5577 (3) | 0.14953 (14) | 0.0206 (5) | |
H7A | 0.3294 | 0.4592 | 0.1719 | 0.025* | |
C8 | 0.20895 (17) | 0.5381 (3) | 0.06445 (14) | 0.0212 (5) | |
H8A | 0.2052 | 0.4286 | 0.0287 | 0.025* | |
C9 | 0.37584 (16) | 0.7249 (3) | 0.29319 (14) | 0.0188 (5) | |
C10 | 0.35757 (16) | 0.7869 (3) | 0.37973 (14) | 0.0198 (5) | |
H10A | 0.2899 | 0.8339 | 0.3819 | 0.024* | |
C11 | 0.43708 (17) | 0.7805 (3) | 0.46212 (14) | 0.0209 (5) | |
H11A | 0.4235 | 0.8229 | 0.5204 | 0.025* | |
C12 | 0.53657 (16) | 0.7127 (3) | 0.46029 (14) | 0.0188 (5) | |
C13 | 0.55552 (17) | 0.6511 (3) | 0.37448 (14) | 0.0211 (5) | |
H13A | 0.6233 | 0.6040 | 0.3725 | 0.025* | |
C14 | 0.47657 (16) | 0.6582 (3) | 0.29247 (14) | 0.0215 (5) | |
H14A | 0.4909 | 0.6170 | 0.2342 | 0.026* | |
C15 | 0.62115 (16) | 0.7076 (3) | 0.54930 (15) | 0.0198 (5) | |
C16 | 0.79774 (17) | 0.6225 (3) | 0.61760 (15) | 0.0258 (5) | |
H16A | 0.8590 | 0.5660 | 0.5999 | 0.039* | |
H16B | 0.7760 | 0.5480 | 0.6662 | 0.039* | |
H16C | 0.8170 | 0.7446 | 0.6431 | 0.039* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0266 (9) | 0.0302 (9) | 0.0209 (8) | 0.0058 (7) | −0.0052 (7) | −0.0085 (7) |
O2 | 0.0427 (10) | 0.0261 (9) | 0.0284 (9) | 0.0092 (8) | −0.0087 (8) | −0.0008 (7) |
O3 | 0.0201 (8) | 0.0284 (8) | 0.0188 (8) | 0.0022 (7) | −0.0030 (6) | −0.0014 (6) |
O4 | 0.0283 (9) | 0.0359 (9) | 0.0183 (8) | 0.0000 (7) | 0.0019 (7) | −0.0053 (7) |
N1 | 0.0321 (12) | 0.0302 (11) | 0.0304 (12) | 0.0010 (9) | −0.0001 (9) | −0.0020 (9) |
C1 | 0.0267 (12) | 0.0343 (13) | 0.0168 (11) | 0.0013 (10) | −0.0059 (9) | −0.0066 (9) |
C2 | 0.0238 (11) | 0.0199 (11) | 0.0203 (11) | 0.0008 (9) | 0.0038 (9) | 0.0003 (9) |
C3 | 0.0204 (11) | 0.0224 (11) | 0.0171 (11) | −0.0025 (9) | 0.0033 (9) | −0.0003 (9) |
C4 | 0.0203 (11) | 0.0193 (10) | 0.0213 (11) | 0.0015 (9) | 0.0035 (9) | 0.0018 (9) |
C5 | 0.0204 (11) | 0.0201 (11) | 0.0175 (10) | −0.0030 (9) | 0.0062 (9) | −0.0013 (9) |
C6 | 0.0166 (10) | 0.0229 (11) | 0.0155 (10) | −0.0017 (9) | 0.0052 (9) | 0.0000 (8) |
C7 | 0.0196 (11) | 0.0210 (11) | 0.0205 (11) | 0.0022 (9) | 0.0032 (9) | 0.0002 (9) |
C8 | 0.0234 (11) | 0.0201 (11) | 0.0197 (11) | 0.0001 (9) | 0.0037 (9) | −0.0026 (9) |
C9 | 0.0209 (11) | 0.0168 (10) | 0.0176 (10) | −0.0035 (9) | 0.0019 (9) | −0.0006 (8) |
C10 | 0.0191 (11) | 0.0207 (11) | 0.0191 (11) | −0.0001 (9) | 0.0036 (9) | −0.0021 (9) |
C11 | 0.0251 (12) | 0.0202 (11) | 0.0177 (11) | 0.0001 (9) | 0.0055 (9) | −0.0028 (8) |
C12 | 0.0205 (11) | 0.0163 (10) | 0.0181 (11) | −0.0032 (9) | 0.0014 (9) | 0.0014 (8) |
C13 | 0.0187 (11) | 0.0243 (12) | 0.0202 (11) | 0.0001 (9) | 0.0044 (9) | −0.0008 (9) |
C14 | 0.0218 (11) | 0.0274 (12) | 0.0162 (10) | −0.0021 (9) | 0.0060 (9) | −0.0048 (9) |
C15 | 0.0227 (12) | 0.0151 (10) | 0.0204 (11) | −0.0042 (9) | 0.0023 (9) | 0.0021 (9) |
C16 | 0.0220 (12) | 0.0291 (12) | 0.0216 (11) | 0.0012 (10) | −0.0047 (9) | 0.0014 (10) |
O1—C2 | 1.332 (2) | C6—C9 | 1.483 (3) |
O1—C1 | 1.442 (2) | C7—C8 | 1.379 (3) |
O2—C2 | 1.211 (2) | C7—H7A | 0.9500 |
O3—C15 | 1.342 (2) | C8—H8A | 0.9500 |
O3—C16 | 1.443 (2) | C9—C14 | 1.396 (3) |
O4—C15 | 1.204 (2) | C9—C10 | 1.399 (3) |
N1—C5 | 1.379 (3) | C10—C11 | 1.383 (3) |
N1—H1NB | 0.877 (5) | C10—H10A | 0.9500 |
N1—H1NA | 0.879 (5) | C11—C12 | 1.388 (3) |
C1—H1C | 0.9800 | C11—H11A | 0.9500 |
C1—H1B | 0.9800 | C12—C13 | 1.391 (3) |
C1—H1A | 0.9800 | C12—C15 | 1.485 (3) |
C2—C3 | 1.482 (3) | C13—C14 | 1.376 (3) |
C3—C4 | 1.388 (3) | C13—H13A | 0.9500 |
C3—C8 | 1.390 (3) | C14—H14A | 0.9500 |
C4—C5 | 1.397 (3) | C16—H16A | 0.9800 |
C4—H4A | 0.9500 | C16—H16B | 0.9800 |
C5—C6 | 1.413 (3) | C16—H16C | 0.9800 |
C6—C7 | 1.399 (3) | ||
C2—O1—C1 | 116.20 (16) | C7—C8—H8A | 120.6 |
C15—O3—C16 | 115.67 (16) | C3—C8—H8A | 120.6 |
C5—N1—H1NB | 113.4 (17) | C14—C9—C10 | 118.07 (19) |
C5—N1—H1NA | 117.6 (17) | C14—C9—C6 | 118.81 (18) |
H1NB—N1—H1NA | 120 (2) | C10—C9—C6 | 123.01 (19) |
O1—C1—H1C | 109.5 | C11—C10—C9 | 120.68 (19) |
O1—C1—H1B | 109.5 | C11—C10—H10A | 119.7 |
H1C—C1—H1B | 109.5 | C9—C10—H10A | 119.7 |
O1—C1—H1A | 109.5 | C10—C11—C12 | 120.51 (18) |
H1C—C1—H1A | 109.5 | C10—C11—H11A | 119.7 |
H1B—C1—H1A | 109.5 | C12—C11—H11A | 119.7 |
O2—C2—O1 | 122.46 (19) | C11—C12—C13 | 119.20 (19) |
O2—C2—C3 | 125.17 (19) | C11—C12—C15 | 119.80 (18) |
O1—C2—C3 | 112.37 (17) | C13—C12—C15 | 121.00 (19) |
C4—C3—C8 | 120.21 (18) | C14—C13—C12 | 120.3 (2) |
C4—C3—C2 | 117.99 (18) | C14—C13—H13A | 119.9 |
C8—C3—C2 | 121.80 (18) | C12—C13—H13A | 119.9 |
C3—C4—C5 | 121.22 (19) | C13—C14—C9 | 121.25 (18) |
C3—C4—H4A | 119.4 | C13—C14—H14A | 119.4 |
C5—C4—H4A | 119.4 | C9—C14—H14A | 119.4 |
N1—C5—C4 | 117.78 (19) | O4—C15—O3 | 123.07 (19) |
N1—C5—C6 | 123.24 (18) | O4—C15—C12 | 125.2 (2) |
C4—C5—C6 | 118.97 (18) | O3—C15—C12 | 111.68 (17) |
C7—C6—C5 | 118.25 (18) | O3—C16—H16A | 109.5 |
C7—C6—C9 | 118.09 (18) | O3—C16—H16B | 109.5 |
C5—C6—C9 | 123.65 (18) | H16A—C16—H16B | 109.5 |
C8—C7—C6 | 122.60 (19) | O3—C16—H16C | 109.5 |
C8—C7—H7A | 118.7 | H16A—C16—H16C | 109.5 |
C6—C7—H7A | 118.7 | H16B—C16—H16C | 109.5 |
C7—C8—C3 | 118.75 (19) | ||
C1—O1—C2—O2 | 2.4 (3) | C5—C6—C9—C14 | −136.4 (2) |
C1—O1—C2—C3 | −177.63 (17) | C7—C6—C9—C10 | −133.4 (2) |
O2—C2—C3—C4 | −0.5 (3) | C5—C6—C9—C10 | 47.5 (3) |
O1—C2—C3—C4 | 179.46 (17) | C14—C9—C10—C11 | −0.5 (3) |
O2—C2—C3—C8 | −179.8 (2) | C6—C9—C10—C11 | 175.68 (19) |
O1—C2—C3—C8 | 0.2 (3) | C9—C10—C11—C12 | 0.1 (3) |
C8—C3—C4—C5 | 1.0 (3) | C10—C11—C12—C13 | 0.0 (3) |
C2—C3—C4—C5 | −178.30 (18) | C10—C11—C12—C15 | 179.73 (18) |
C3—C4—C5—N1 | −179.38 (19) | C11—C12—C13—C14 | 0.3 (3) |
C3—C4—C5—C6 | −0.6 (3) | C15—C12—C13—C14 | −179.44 (18) |
N1—C5—C6—C7 | 178.43 (19) | C12—C13—C14—C9 | −0.7 (3) |
C4—C5—C6—C7 | −0.2 (3) | C10—C9—C14—C13 | 0.8 (3) |
N1—C5—C6—C9 | −2.5 (3) | C6—C9—C14—C13 | −175.55 (18) |
C4—C5—C6—C9 | 178.85 (18) | C16—O3—C15—O4 | 1.7 (3) |
C5—C6—C7—C8 | 0.8 (3) | C16—O3—C15—C12 | −179.20 (16) |
C9—C6—C7—C8 | −178.35 (19) | C11—C12—C15—O4 | −2.0 (3) |
C6—C7—C8—C3 | −0.5 (3) | C13—C12—C15—O4 | 177.7 (2) |
C4—C3—C8—C7 | −0.4 (3) | C11—C12—C15—O3 | 178.96 (18) |
C2—C3—C8—C7 | 178.82 (19) | C13—C12—C15—O3 | −1.3 (3) |
C7—C6—C9—C14 | 42.7 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1NB···O2i | 0.88 (1) | 2.54 (2) | 3.304 (3) | 146 (2) |
N1—H1NA···O4ii | 0.88 (1) | 2.33 (1) | 3.147 (2) | 155 (2) |
C4—H4A···O2i | 0.95 | 2.44 | 3.301 (3) | 150 |
Symmetry codes: (i) −x, −y+2, −z; (ii) −x+1, −y+2, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C16H15NO4 |
Mr | 285.29 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 90 |
a, b, c (Å) | 12.955 (3), 7.3460 (16), 14.422 (3) |
β (°) | 103.263 (10) |
V (Å3) | 1336.0 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.28 × 0.12 × 0.06 |
Data collection | |
Diffractometer | Bruker APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2005) |
Tmin, Tmax | 0.972, 0.994 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9113, 2463, 1785 |
Rint | 0.036 |
(sin θ/λ)max (Å−1) | 0.607 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.045, 0.124, 1.01 |
No. of reflections | 2463 |
No. of parameters | 198 |
No. of restraints | 2 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.27, −0.35 |
Computer programs: APEX2 (Bruker, 2005), SAINT (Bruker, 2005), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1NB···O2i | 0.877 (5) | 2.541 (15) | 3.304 (3) | 146 (2) |
N1—H1NA···O4ii | 0.879 (5) | 2.328 (12) | 3.147 (2) | 155 (2) |
C4—H4A···O2i | 0.95 | 2.44 | 3.301 (3) | 150.4 |
Symmetry codes: (i) −x, −y+2, −z; (ii) −x+1, −y+2, −z+1. |
Acknowledgements
RLL thanks the Jean Dreyfus Boissevain Lectureship for Undergraduate Institutions, the UMass Dartmouth Office of Undergraduate Research Award and the UMass Dartmouth Honors Summer Research Grant for funding. DRM gratefully acknowledges support from the UMass Dartmouth Chancellor's Research Fund and the Joseph P. Healey Endowment.
References
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Biphenyl-4,4'-dicarboxylate and its derivatives are widely used in metal-organic (MOFs) frameworks as linkers (Sudik et al. 2005). One of the many advantages of MOFs is the ability to incorporate different functional groups within their pores. An area of interest is the inclusion of open Lewis base sites on the interior surfaces of MOFs. As a part of our efforts in this field, we prepared the previously reported dimethyl-2-aminobiphenyl-4,4'-dicarboxylate (Olkhovik et al. 2008) and report its structure herein.
The molecular structure of the title compound is shown in Figure 1. The two phenyl rings demonstrate a dihedral angle of 135.3°. In the crystal, intermolecular hydrogen bonding is observed between N1–H1NA···O4 and N1H1NB···O2. There is also a close C–H···O contact along C4H4A···O2. No π-π interactions were noted between the phenyl rings. The packing for the title compound indicating hydrogen bonding is shown in Figure 2.