organic compounds
H-benzo[h]chromene-3-carbonitrile
of 2-amino-4-phenyl-4aChemistry and Environmental Division, Manchester Metropolitan University, Manchester M1 5GD, England, bChemistry Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt, cSchool of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, England, dDepartment of Physics, Faculty of Sciences, Erciyes University, 38039 Kayseri, Turkey, eChemistry Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt, and fKirkuk University, College of Science, Department of Chemistry, Kirkuk, Iraq
*Correspondence e-mail: shaabankamel@yahoo.com
In the title compound, C20H14N2O, the plane of the phenyl ring is almost normal to that of the naphthalene ring system, forming a dihedral angle of 83.15 (8)°. The 4H-pyran ring fused with the naphthalene ring system has a flattened boat conformation. In the crystal, molecules are linked by pairs of N—H⋯N hydrogen bonds, forming inversion dimers with an R22(12) ring motif. The dimers are connected by C—H⋯π interactions, forming supramolecular chains along [010].
CCDC reference: 1406770
1. Related literature
For synthesis of chromene-containing compounds, see: Elagamey et al. (1988); El-Maghraby (2014). For industrial applications of aminochromenes, see: Ellis (1977); Hafez et al. (1987). For various biological activities of fused chromenes, see: Hiramoto et al. (1997); Bianchi & Tava (1987); Eiden & Denk (1991); Smith et al. (1998); Taylor et al. (1998). For the of the isomer of the title compound, 3-amino-1-phenyl-1H-benzo[f]chromene-2-carbonitrile, see: Akkurt et al. (2013).
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: CrystalClearSM Expert (Rigaku, 2012); cell CrystalClearSM Expert; data reduction: CrystalClearSM Expert; program(s) used to solve structure: SUPERFLIP (Palatinus & Chapuis, 2007); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: WinGX (Farrugia, 2012).
Supporting information
CCDC reference: 1406770
10.1107/S2056989015011536/tk5369sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S2056989015011536/tk5369Isup2.hkl
Supporting information file. DOI: 10.1107/S2056989015011536/tk5369Isup3.cml
To a solution of 1-naphthol (144 mg; 1 mmol) in 10 ml absolute ethanol, an equimolar amount of benzylidene-malononitrile (154 mg; 1 mmol) was added with constant stirring. The reaction mixture was refluxed for 3 h in the presence of a catalytic amount of piperidine. The reaction progress was monitored by TLC and after cooling, the formed precipitate was filtered off, washed with cold ethanol and dried under vacuum in a desiccator for 24 h. The solid was recrystallized from ethanol. Crystals suitable for X-ray crystallography were obtained by slow evaporation of a solution of the title compound in ethanol (yield 92%; m.p. 483 K).
The H atoms of the NH2 group were were refined. The H atoms attached to the C atoms were positioned geometrically, with C—H = 0.95 Å and C—H = 1.00 Å for aromatic and methine H, respectively, and with Uiso(H) = 1.2Ueq(C).
Data collection: CrystalClearSM Expert (Rigaku, 2012); cell
CrystalClearSM Expert (Rigaku, 2012); data reduction: CrystalClearSM Expert (Rigaku, 2012); program(s) used to solve structure: SUPERFLIP (Palatinus & Chapuis, 2007); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: WinGX (Farrugia, 2012).C20H14N2O | F(000) = 312 |
Mr = 298.33 | Dx = 1.357 Mg m−3 |
Monoclinic, P21 | Cu Kα radiation, λ = 1.54178 Å |
Hall symbol: P 2yb | Cell parameters from 5573 reflections |
a = 9.1662 (1) Å | θ = 6.3–66.6° |
b = 5.7246 (1) Å | µ = 0.67 mm−1 |
c = 13.9177 (2) Å | T = 100 K |
β = 90.153 (1)° | Block, brown |
V = 730.30 (2) Å3 | 0.28 × 0.13 × 0.10 mm |
Z = 2 |
Rigaku AFC11 diffractometer | 2201 independent reflections |
Radiation source: Rotating Anode | 2184 reflections with I > 2σ(I) |
Detector resolution: 22.2222 pixels mm-1 | Rint = 0.029 |
profile data from ω–scans | θmax = 66.7°, θmin = 4.8° |
Absorption correction: multi-scan (CrystalClear-SM Expert; Rigaku, 2012) | h = −10→10 |
Tmin = 0.883, Tmax = 1.000 | k = −6→6 |
5778 measured reflections | l = −16→16 |
Refinement on F2 | Hydrogen site location: mixed |
Least-squares matrix: full | H atoms treated by a mixture of independent and constrained refinement |
R[F2 > 2σ(F2)] = 0.031 | w = 1/[σ2(FO2) + (0.0642P)2 + 0.1186P] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.093 | (Δ/σ)max < 0.001 |
S = 1.09 | Δρmax = 0.14 e Å−3 |
2201 reflections | Δρmin = −0.15 e Å−3 |
216 parameters | Absolute structure: Flack x determined using 775 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013) |
1 restraint | Absolute structure parameter: 0.2 (3) |
C20H14N2O | V = 730.30 (2) Å3 |
Mr = 298.33 | Z = 2 |
Monoclinic, P21 | Cu Kα radiation |
a = 9.1662 (1) Å | µ = 0.67 mm−1 |
b = 5.7246 (1) Å | T = 100 K |
c = 13.9177 (2) Å | 0.28 × 0.13 × 0.10 mm |
β = 90.153 (1)° |
Rigaku AFC11 diffractometer | 2201 independent reflections |
Absorption correction: multi-scan (CrystalClear-SM Expert; Rigaku, 2012) | 2184 reflections with I > 2σ(I) |
Tmin = 0.883, Tmax = 1.000 | Rint = 0.029 |
5778 measured reflections |
R[F2 > 2σ(F2)] = 0.031 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.093 | Δρmax = 0.14 e Å−3 |
S = 1.09 | Δρmin = −0.15 e Å−3 |
2201 reflections | Absolute structure: Flack x determined using 775 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013) |
216 parameters | Absolute structure parameter: 0.2 (3) |
1 restraint |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles |
Refinement. Refinement on F2 for ALL reflections except those flagged by the user for potential systematic errors. Weighted R-factors wR and all goodnesses of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The observed criterion of F2 > σ(F2) is used only for calculating -R-factor-obs 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 | 0.64120 (15) | 0.8755 (3) | 0.32053 (9) | 0.0250 (4) | |
N1 | 0.5228 (2) | 0.9831 (4) | 0.18837 (13) | 0.0279 (6) | |
N2 | 0.58898 (19) | 0.5238 (4) | 0.01142 (12) | 0.0305 (6) | |
C1 | 0.6097 (2) | 0.8195 (4) | 0.22720 (13) | 0.0223 (5) | |
C2 | 0.6647 (2) | 0.6252 (4) | 0.18462 (14) | 0.0228 (6) | |
C3 | 0.7792 (2) | 0.4700 (4) | 0.23142 (13) | 0.0222 (6) | |
C4 | 0.7851 (2) | 0.5235 (4) | 0.33777 (13) | 0.0225 (6) | |
C5 | 0.8612 (2) | 0.3703 (4) | 0.40074 (14) | 0.0264 (6) | |
C6 | 0.8631 (2) | 0.4068 (4) | 0.49782 (15) | 0.0286 (6) | |
C7 | 0.7877 (2) | 0.5997 (4) | 0.53815 (14) | 0.0255 (6) | |
C8 | 0.7844 (2) | 0.6408 (5) | 0.63859 (14) | 0.0297 (6) | |
C9 | 0.7137 (2) | 0.8309 (5) | 0.67554 (14) | 0.0301 (6) | |
C10 | 0.6403 (2) | 0.9868 (5) | 0.61433 (15) | 0.0307 (6) | |
C11 | 0.6388 (2) | 0.9514 (4) | 0.51680 (14) | 0.0275 (6) | |
C12 | 0.7134 (2) | 0.7592 (4) | 0.47686 (14) | 0.0239 (6) | |
C13 | 0.7165 (2) | 0.7126 (4) | 0.37642 (13) | 0.0226 (6) | |
C14 | 0.6217 (2) | 0.5720 (4) | 0.08901 (13) | 0.0241 (6) | |
C15 | 0.9263 (2) | 0.4943 (4) | 0.18151 (13) | 0.0222 (6) | |
C16 | 0.9754 (2) | 0.3182 (4) | 0.12136 (13) | 0.0261 (6) | |
C17 | 1.1057 (2) | 0.3423 (5) | 0.07107 (14) | 0.0301 (6) | |
C18 | 1.1876 (2) | 0.5433 (5) | 0.08102 (14) | 0.0301 (6) | |
C19 | 1.1396 (2) | 0.7208 (5) | 0.14112 (14) | 0.0293 (6) | |
C20 | 1.0097 (2) | 0.6961 (4) | 0.19070 (14) | 0.0260 (6) | |
H1A | 0.474 (3) | 1.088 (5) | 0.2297 (18) | 0.034 (7)* | |
H1B | 0.501 (3) | 0.971 (6) | 0.125 (2) | 0.040 (7)* | |
H3 | 0.74660 | 0.30430 | 0.22390 | 0.0270* | |
H5 | 0.91180 | 0.24000 | 0.37480 | 0.0320* | |
H6 | 0.91520 | 0.30260 | 0.53850 | 0.0340* | |
H8 | 0.83200 | 0.53470 | 0.68080 | 0.0360* | |
H9 | 0.71420 | 0.85760 | 0.74290 | 0.0360* | |
H10 | 0.59130 | 1.11800 | 0.64070 | 0.0370* | |
H11 | 0.58740 | 1.05650 | 0.47620 | 0.0330* | |
H16 | 0.91940 | 0.17950 | 0.11430 | 0.0310* | |
H17 | 1.13830 | 0.22050 | 0.03000 | 0.0360* | |
H18 | 1.27650 | 0.56020 | 0.04680 | 0.0360* | |
H19 | 1.19580 | 0.85910 | 0.14820 | 0.0350* | |
H20 | 0.97710 | 0.81850 | 0.23150 | 0.0310* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0306 (8) | 0.0258 (8) | 0.0186 (6) | 0.0031 (7) | −0.0059 (5) | −0.0008 (6) |
N1 | 0.0309 (9) | 0.0322 (11) | 0.0205 (9) | 0.0045 (9) | −0.0056 (7) | −0.0012 (8) |
N2 | 0.0297 (9) | 0.0375 (12) | 0.0243 (9) | 0.0007 (9) | −0.0046 (7) | −0.0041 (8) |
C1 | 0.0219 (9) | 0.0273 (11) | 0.0178 (8) | −0.0041 (9) | −0.0026 (7) | 0.0026 (8) |
C2 | 0.0202 (9) | 0.0293 (12) | 0.0190 (9) | −0.0025 (9) | −0.0022 (7) | 0.0002 (8) |
C3 | 0.0226 (9) | 0.0205 (10) | 0.0236 (10) | −0.0015 (9) | −0.0021 (7) | −0.0009 (8) |
C4 | 0.0191 (9) | 0.0272 (12) | 0.0213 (9) | −0.0039 (8) | −0.0007 (7) | 0.0010 (8) |
C5 | 0.0249 (9) | 0.0270 (12) | 0.0272 (10) | 0.0003 (10) | 0.0001 (7) | 0.0025 (9) |
C6 | 0.0276 (10) | 0.0325 (13) | 0.0256 (10) | −0.0010 (10) | −0.0044 (8) | 0.0074 (9) |
C7 | 0.0220 (9) | 0.0321 (12) | 0.0223 (9) | −0.0050 (9) | −0.0013 (7) | 0.0029 (9) |
C8 | 0.0259 (10) | 0.0414 (14) | 0.0219 (9) | −0.0058 (10) | −0.0031 (8) | 0.0058 (9) |
C9 | 0.0275 (10) | 0.0427 (14) | 0.0200 (9) | −0.0106 (11) | 0.0002 (7) | −0.0028 (10) |
C10 | 0.0296 (10) | 0.0356 (13) | 0.0268 (10) | −0.0044 (11) | 0.0024 (8) | −0.0060 (9) |
C11 | 0.0280 (10) | 0.0298 (12) | 0.0246 (10) | −0.0018 (10) | −0.0018 (8) | −0.0021 (9) |
C12 | 0.0202 (9) | 0.0301 (12) | 0.0214 (9) | −0.0064 (9) | −0.0012 (7) | 0.0006 (8) |
C13 | 0.0214 (9) | 0.0251 (11) | 0.0213 (9) | −0.0029 (9) | −0.0031 (7) | 0.0036 (8) |
C14 | 0.0226 (9) | 0.0263 (11) | 0.0235 (10) | −0.0010 (9) | 0.0001 (7) | 0.0003 (9) |
C15 | 0.0227 (10) | 0.0265 (11) | 0.0173 (8) | 0.0004 (9) | −0.0025 (7) | 0.0029 (8) |
C16 | 0.0301 (10) | 0.0250 (12) | 0.0231 (9) | 0.0024 (10) | −0.0032 (7) | −0.0016 (8) |
C17 | 0.0319 (11) | 0.0346 (13) | 0.0238 (9) | 0.0069 (10) | 0.0008 (7) | −0.0020 (10) |
C18 | 0.0245 (10) | 0.0429 (14) | 0.0230 (9) | 0.0041 (10) | 0.0002 (7) | 0.0067 (9) |
C19 | 0.0264 (10) | 0.0328 (12) | 0.0286 (10) | −0.0040 (10) | −0.0030 (8) | 0.0056 (9) |
C20 | 0.0274 (10) | 0.0263 (12) | 0.0244 (10) | 0.0001 (10) | −0.0001 (8) | −0.0024 (9) |
O1—C1 | 1.368 (2) | C11—C12 | 1.410 (3) |
O1—C13 | 1.396 (3) | C12—C13 | 1.424 (3) |
N1—C1 | 1.342 (3) | C15—C20 | 1.391 (3) |
N2—C14 | 1.154 (3) | C15—C16 | 1.386 (3) |
C1—C2 | 1.358 (3) | C16—C17 | 1.393 (3) |
N1—H1B | 0.91 (3) | C17—C18 | 1.381 (4) |
N1—H1A | 0.95 (3) | C18—C19 | 1.388 (3) |
C2—C14 | 1.420 (3) | C19—C20 | 1.385 (3) |
C2—C3 | 1.520 (3) | C3—H3 | 1.0000 |
C3—C4 | 1.512 (3) | C5—H5 | 0.9500 |
C3—C15 | 1.525 (3) | C6—H6 | 0.9500 |
C4—C13 | 1.363 (3) | C8—H8 | 0.9500 |
C4—C5 | 1.422 (3) | C9—H9 | 0.9500 |
C5—C6 | 1.367 (3) | C10—H10 | 0.9500 |
C6—C7 | 1.419 (3) | C11—H11 | 0.9500 |
C7—C12 | 1.422 (3) | C16—H16 | 0.9500 |
C7—C8 | 1.418 (3) | C17—H17 | 0.9500 |
C8—C9 | 1.368 (4) | C18—H18 | 0.9500 |
C9—C10 | 1.404 (3) | C19—H19 | 0.9500 |
C10—C11 | 1.373 (3) | C20—H20 | 0.9500 |
C1—O1—C13 | 118.39 (17) | C3—C15—C20 | 121.36 (18) |
O1—C1—N1 | 110.02 (18) | C16—C15—C20 | 118.70 (17) |
O1—C1—C2 | 121.91 (18) | C15—C16—C17 | 120.8 (2) |
N1—C1—C2 | 128.06 (18) | C16—C17—C18 | 119.9 (2) |
C1—N1—H1B | 118 (2) | C17—C18—C19 | 119.82 (18) |
H1A—N1—H1B | 123 (3) | C18—C19—C20 | 120.0 (2) |
C1—N1—H1A | 118.7 (16) | C15—C20—C19 | 120.8 (2) |
C1—C2—C3 | 123.25 (17) | C2—C3—H3 | 108.00 |
C1—C2—C14 | 118.83 (19) | C4—C3—H3 | 108.00 |
C3—C2—C14 | 117.76 (18) | C15—C3—H3 | 108.00 |
C2—C3—C15 | 111.21 (16) | C4—C5—H5 | 119.00 |
C4—C3—C15 | 113.46 (15) | C6—C5—H5 | 119.00 |
C2—C3—C4 | 108.89 (17) | C5—C6—H6 | 120.00 |
C3—C4—C13 | 122.12 (18) | C7—C6—H6 | 120.00 |
C3—C4—C5 | 119.65 (19) | C7—C8—H8 | 120.00 |
C5—C4—C13 | 118.21 (17) | C9—C8—H8 | 120.00 |
C4—C5—C6 | 121.3 (2) | C8—C9—H9 | 120.00 |
C5—C6—C7 | 120.32 (19) | C10—C9—H9 | 120.00 |
C8—C7—C12 | 118.3 (2) | C9—C10—H10 | 120.00 |
C6—C7—C8 | 122.1 (2) | C11—C10—H10 | 120.00 |
C6—C7—C12 | 119.69 (18) | C10—C11—H11 | 120.00 |
C7—C8—C9 | 120.9 (2) | C12—C11—H11 | 120.00 |
C8—C9—C10 | 120.29 (19) | C15—C16—H16 | 120.00 |
C9—C10—C11 | 120.6 (2) | C17—C16—H16 | 120.00 |
C10—C11—C12 | 120.1 (2) | C16—C17—H17 | 120.00 |
C11—C12—C13 | 122.97 (19) | C18—C17—H17 | 120.00 |
C7—C12—C11 | 119.76 (18) | C17—C18—H18 | 120.00 |
C7—C12—C13 | 117.26 (19) | C19—C18—H18 | 120.00 |
O1—C13—C12 | 114.26 (18) | C18—C19—H19 | 120.00 |
O1—C13—C4 | 122.59 (16) | C20—C19—H19 | 120.00 |
C4—C13—C12 | 123.14 (19) | C15—C20—H20 | 120.00 |
N2—C14—C2 | 178.3 (2) | C19—C20—H20 | 120.00 |
C3—C15—C16 | 119.85 (19) | ||
C13—O1—C1—N1 | 172.70 (17) | C4—C5—C6—C7 | 0.3 (3) |
C13—O1—C1—C2 | −8.3 (3) | C5—C6—C7—C8 | 178.6 (2) |
C1—O1—C13—C4 | 13.6 (3) | C5—C6—C7—C12 | −1.8 (3) |
C1—O1—C13—C12 | −165.44 (17) | C6—C7—C8—C9 | 178.5 (2) |
O1—C1—C2—C3 | −7.7 (3) | C12—C7—C8—C9 | −1.1 (3) |
O1—C1—C2—C14 | 176.97 (18) | C6—C7—C12—C11 | −179.80 (18) |
N1—C1—C2—C3 | 171.1 (2) | C6—C7—C12—C13 | 1.3 (3) |
N1—C1—C2—C14 | −4.2 (3) | C8—C7—C12—C11 | −0.2 (3) |
C1—C2—C3—C4 | 16.6 (3) | C8—C7—C12—C13 | −179.15 (19) |
C1—C2—C3—C15 | −109.1 (2) | C7—C8—C9—C10 | 1.3 (3) |
C14—C2—C3—C4 | −168.01 (18) | C8—C9—C10—C11 | −0.2 (3) |
C14—C2—C3—C15 | 66.3 (2) | C9—C10—C11—C12 | −1.1 (3) |
C2—C3—C4—C5 | 167.12 (18) | C10—C11—C12—C7 | 1.3 (3) |
C2—C3—C4—C13 | −11.3 (3) | C10—C11—C12—C13 | −179.9 (2) |
C15—C3—C4—C5 | −68.5 (3) | C7—C12—C13—O1 | 179.84 (17) |
C15—C3—C4—C13 | 113.1 (2) | C7—C12—C13—C4 | 0.8 (3) |
C2—C3—C15—C16 | −105.1 (2) | C11—C12—C13—O1 | 0.9 (3) |
C2—C3—C15—C20 | 71.3 (2) | C11—C12—C13—C4 | −178.1 (2) |
C4—C3—C15—C16 | 131.7 (2) | C3—C15—C16—C17 | 176.54 (18) |
C4—C3—C15—C20 | −51.9 (3) | C20—C15—C16—C17 | 0.1 (3) |
C3—C4—C5—C6 | −176.86 (18) | C3—C15—C20—C19 | −176.69 (18) |
C13—C4—C5—C6 | 1.6 (3) | C16—C15—C20—C19 | −0.3 (3) |
C3—C4—C13—O1 | −2.7 (3) | C15—C16—C17—C18 | 0.1 (3) |
C3—C4—C13—C12 | 176.26 (18) | C16—C17—C18—C19 | −0.1 (3) |
C5—C4—C13—O1 | 178.81 (18) | C17—C18—C19—C20 | −0.2 (3) |
C5—C4—C13—C12 | −2.2 (3) | C18—C19—C20—C15 | 0.3 (3) |
Cg1 is the centroid of the C15–C20 phenyl ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1B···N2i | 0.91 (3) | 2.09 (3) | 2.970 (2) | 163 (3) |
C9—H9···Cg1ii | 0.95 | 2.88 | 3.574 (2) | 131 |
Symmetry codes: (i) −x+1, y+1/2, −z; (ii) −x+2, y+1/2, −z+1. |
Cg1 is the centroid of the C15–C20 phenyl ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1B···N2i | 0.91 (3) | 2.09 (3) | 2.970 (2) | 163 (3) |
C9—H9···Cg1ii | 0.95 | 2.88 | 3.574 (2) | 131 |
Symmetry codes: (i) −x+1, y+1/2, −z; (ii) −x+2, y+1/2, −z+1. |
Acknowledgements
The authors would like to express their thanks to the National Crystallography Service, Southampton, UK, for providing the X-ray data.
References
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Among synthetic heterocyclic compounds, aminochromenes represent an important class of organic compounds being the main components of many naturally occurring products (Elagamey et al., 1988; El-Maghraby, 2014). They are used for the chemical synthesis of cosmetics, pigments (Ellis, 1977), and potentially biodegradable agrochemicals (Hafez, et al., 1987). Fused chromene systems have displayed a broad spectrum of biological activities such as mutagenicity (Hiramoto, et al., 1997), sex pheromonal (Bianchi & Tava, 1987), central nervous system (CNS) activities (Eiden & Denk, 1991) and inhibitors for influenza virus sialidases (Smith et al., 1998; Taylor et al., 1998). In this context and following our strategy for the synthesis of bio-active molecules, we herein report the synthesis and crystal structure of the title compound.
As seen in Fig. 1, the C4–C13 naphthalene ring system of the title compound is essentially planar [maximum deviations = -0.020 (2) Å for C4 and -0.016 (2) Å for C8]. The C15–C20 phenyl ring makes a dihedral angle of 83.15 (8)° with the mean plane of the naphthalene ring. The 4H-pyran ring (O1/C1–C4/C13) in the title compound is puckered [the puckering parameters (Cremer & Pople, 1975) are QT = 0.177 (2) Å, θ = 98.2 (6) ° and ϕ = 342.9 (7) °. The structural geometric parameters of the title compound are normal and are consistent with those of the isomer compound 3-amino-1-phenyl-1H-benzo[f]chromene-2-carbonitrile (Akkurt et al., 2013). Both isomers crystallizes in the same monoclinic space group P21 and their unit-cell parameters are almost equal.
In the crystal, pairs of N—H···N hydrogen bonds form inversion dimers with an R22(12) ring motif (Table 1 and Fig. 2). In addition, C—H···π interactions are observed.