organic compounds
10-Ethyl-10H-phenothiazine-3-carbaldehyde
aDepartment of Chemistry, Anhui University, Hefei 230039, People's Republic of China, and Key Laboratory of Functional Inorganic Materials, Chemistry, Hefei 230039, People's Republic of China
*Correspondence e-mail: kong_lin2009@126.com
In the title molecule, C15H13NOS, the two benzene rings of the tricyclic fused-ring system are inclined at 21.1 (1)°. In the crystal, weak C—H⋯O hydrogen bonds link the molecules into chains along [001]. The crystal packing also exhibits π–π interactions with a distance of 3.801 (5) Å between the centroids of the benzene rings of neighbouring molecules.
Related literature
For related structures, see: Chu & Van der Helm (1975); Hdii et al. (1998); Li et al. (2009a,b).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 2002); cell SAINT (Bruker, 2002); 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/S1600536811047799/cv5184sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811047799/cv5184Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811047799/cv5184Isup3.cml
NaH (4.08 g, 0.17 mol) and DMF (5 ml) were added to a three-necked flask equipped with a magnetic stirrer and a reflux condenser, and then phenothiazine (20.0 g, 0.1 mol), DMF (10 ml) were added dropwisely (about 30 min), refluxed for another 20 min. Then C2 H5Br (17 ml) was dropped into the mixture and refluxed for 2 h with TLC detection. The pH of the solution was adjusted to acidic with hydrochloric acid then extracted with 500 ml of ethyl acetate, washed three times with distilled water, and dried with anhydrous magnesium sulfate. It was then filtered and concentrated to produce 18.2 g needle crystals in 80% yield.
N-ethyl-phenothiazine (11.35 g, 0.05 mol) and DMF (39 ml) were added to a three-necked flask in ice equipped with a magnetic stirrer and a reflux condenser, then POCl3 (92 ml) was added dropwisely (about 30 min), the mixture was refluxed for 1 h. Then the mixture was poured into ice to get light yellow solid. The pH of the mixture was adjusted to neutral with NaOH and extracted three times with 150 ml of ethyl acetate. The organic layer was washed with distilled water and then saturated brine. The organic extracts were dried with anhydrous magnesium sulfate. The solvent was removed in vacuo. The residue was purified by
on silica gel with petroleum ether as to give 7.6 g titled compound as a yellow solid in 60% yield. 1H NMR (400 MHz, CDCl3) 7.569 (s, 1H), 7.157 (t, 1H), 7.097 (d, J = 7.8 Hz, 1H), 6.912 (d, J = 6.4 Hz, 1H), 6.896 (d, J = 6.2 Hz, 1H), 3.974 (q, 2H), 1.447 (t,3H). 13C NMR (100 MHz). 89, 42.47, 114.40, 115.58, 123.30, 123.56, 124.51, 127.49, 127.59, 128.25, 130.16, 131.04, 189.98.The methine H atoms was located on a difference map and isotropically refined. All the rest H atoms were placed in geometrically idealized positions (C—H = 0.93 - 0.97 Å) and constrained to ride on their parent atoms, with Uiso(H) = 1.2-1.5 Ueq(C).
The title compound (I) is often used as intermediate in the synthesis of organic compounds with optical properties (Li et al., 2009a, b). Herewith we present its crystal structure.
In (I) (Fig.1), two benzene rings form the dihedral angles of 10.0 (8)° and 12.0 (8)°, respectively, with the thiomorpholine mean plane. The folding of the molecule is characterized by dihedral angle formed by two benzene rings, which is 21.1 (1) °. In the related compounds, 10-ethylphenothiazine (Chu et al., 1975) and 10-ethyl-3-nitrophenothiazine (Hdii et al., 1998), the corresponding dihedral angle is 44.9 (1) and 22.8 (1) °, respectively, showing that any substitution added to benzene ring flattens the tricycle. This tendency also observed in the structure of (E)-3-(10-ethyl-10H-phenothiazin-3-yl)acrylic acid (Li et al., 2009b), where these dihedral angles in two independent molecules are 25.3 (9) ° and 29.8 (8) °, respectively. The ethyl group in (I) is almost orthogonal to the thiazine ring, the torsion angle C6–N1—Cl4–C15 is 85.6 (1)°. While in 10-ethylphenothiazine (Chu et al., 1975), the corresponding angle is 146.1 (4) °, and in 10-ethyl-3-nitrophenothiazine (Hon et al., 1998) this angle is -84.9 (2)°. The aldehyde group is almost coplanar with its attached phenyl ring, the torsion angle C12–C11–C13–O1 being -2.59 °.
In the crystal, weak intermolecular C—H···O hydrogen bonds (Table 1) link molecules into chains along [001]. The crystal packing exhibits π···π interactions with the distance of 3.801 (5) Å between the centroids of benzene rings from the neighbouring molecules.
For the related structures, see: Chu & Van der Helm (1975); Hdii et al. (1998); Li et al. (2009a,b).
Data collection: SMART (Bruker, 2002); cell
SAINT (Bruker, 2002); data reduction: SAINT (Bruker, 2002); 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. : The molecular structure of the title molecule with 50% probability displacement ellipsoids. |
C15H13NOS | F(000) = 1072 |
Mr = 255.32 | Dx = 1.346 Mg m−3 |
Orthorhombic, Pbca | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ac 2ab | Cell parameters from 7387 reflections |
a = 8.0867 (1) Å | θ = 2.7–27.1° |
b = 15.3271 (3) Å | µ = 0.24 mm−1 |
c = 20.3369 (4) Å | T = 296 K |
V = 2520.67 (8) Å3 | Needle, yellow |
Z = 8 | 0.20 × 0.10 × 0.10 mm |
Bruker SMART APEX diffractometer | 2225 independent reflections |
Radiation source: fine-focus sealed tube | 1909 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.028 |
phi and ω scans | θmax = 25.0°, θmin = 2.0° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −9→9 |
Tmin = 0.953, Tmax = 0.976 | k = −17→18 |
17210 measured reflections | l = −22→24 |
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) = 0.109 | w = 1/[σ2(Fo2) + (0.048P)2 + 1.0328P] where P = (Fo2 + 2Fc2)/3 |
S = 1.08 | (Δ/σ)max = 0.030 |
2225 reflections | Δρmax = 0.40 e Å−3 |
167 parameters | Δρmin = −0.42 e Å−3 |
0 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0062 (8) |
C15H13NOS | V = 2520.67 (8) Å3 |
Mr = 255.32 | Z = 8 |
Orthorhombic, Pbca | Mo Kα radiation |
a = 8.0867 (1) Å | µ = 0.24 mm−1 |
b = 15.3271 (3) Å | T = 296 K |
c = 20.3369 (4) Å | 0.20 × 0.10 × 0.10 mm |
Bruker SMART APEX diffractometer | 2225 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 1909 reflections with I > 2σ(I) |
Tmin = 0.953, Tmax = 0.976 | Rint = 0.028 |
17210 measured reflections |
R[F2 > 2σ(F2)] = 0.041 | 0 restraints |
wR(F2) = 0.109 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.08 | Δρmax = 0.40 e Å−3 |
2225 reflections | Δρmin = −0.42 e Å−3 |
167 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 | ||
S1 | 0.24520 (8) | 0.67345 (3) | 0.06193 (3) | 0.0654 (2) | |
C6 | 0.0560 (2) | 0.57828 (11) | 0.14810 (8) | 0.0434 (4) | |
N1 | 0.13723 (18) | 0.50268 (9) | 0.12517 (7) | 0.0460 (4) | |
C1 | 0.0870 (2) | 0.66009 (11) | 0.12020 (9) | 0.0473 (4) | |
C8 | 0.1974 (2) | 0.49538 (11) | 0.06126 (8) | 0.0415 (4) | |
O1 | 0.4535 (2) | 0.53800 (12) | −0.16387 (7) | 0.0733 (4) | |
C12 | 0.3099 (2) | 0.56256 (12) | −0.03694 (9) | 0.0480 (4) | |
H12 | 0.3371 | 0.6129 | −0.0601 | 0.058* | |
C11 | 0.3359 (2) | 0.48174 (13) | −0.06591 (8) | 0.0488 (4) | |
C14 | 0.1335 (2) | 0.42393 (12) | 0.16677 (10) | 0.0541 (5) | |
H14A | 0.1398 | 0.4419 | 0.2124 | 0.065* | |
H14B | 0.2313 | 0.3894 | 0.1574 | 0.065* | |
C7 | 0.2448 (2) | 0.56995 (11) | 0.02515 (9) | 0.0434 (4) | |
C2 | 0.0052 (3) | 0.73369 (13) | 0.14222 (10) | 0.0583 (5) | |
H2 | 0.0247 | 0.7871 | 0.1219 | 0.070* | |
C5 | −0.0556 (2) | 0.57511 (13) | 0.20039 (10) | 0.0554 (5) | |
H5 | −0.0786 | 0.5219 | 0.2204 | 0.066* | |
C13 | 0.4132 (3) | 0.47568 (17) | −0.13082 (10) | 0.0598 (5) | |
C9 | 0.2197 (2) | 0.41474 (12) | 0.03065 (10) | 0.0506 (5) | |
H9 | 0.1869 | 0.3643 | 0.0525 | 0.061* | |
C10 | 0.2888 (2) | 0.40786 (13) | −0.03095 (10) | 0.0540 (5) | |
H10 | 0.3043 | 0.3530 | −0.0495 | 0.065* | |
C15 | −0.0183 (3) | 0.36605 (15) | 0.15823 (12) | 0.0694 (6) | |
H15A | −0.1153 | 0.3976 | 0.1714 | 0.104* | |
H15B | −0.0068 | 0.3148 | 0.1850 | 0.104* | |
H15C | −0.0282 | 0.3492 | 0.1129 | 0.104* | |
C4 | −0.1325 (3) | 0.64997 (17) | 0.22290 (11) | 0.0677 (6) | |
H4 | −0.2044 | 0.6465 | 0.2585 | 0.081* | |
C3 | −0.1046 (3) | 0.72895 (16) | 0.19376 (11) | 0.0679 (6) | |
H3 | −0.1590 | 0.7787 | 0.2085 | 0.081* | |
H13 | 0.429 (4) | 0.4148 (18) | −0.1460 (14) | 0.102* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0860 (4) | 0.0370 (3) | 0.0734 (4) | −0.0115 (2) | 0.0224 (3) | −0.0011 (2) |
C6 | 0.0406 (9) | 0.0475 (10) | 0.0421 (9) | 0.0007 (7) | −0.0072 (7) | 0.0005 (7) |
N1 | 0.0503 (8) | 0.0407 (8) | 0.0471 (8) | 0.0021 (6) | 0.0024 (7) | 0.0102 (6) |
C1 | 0.0509 (10) | 0.0449 (10) | 0.0461 (10) | 0.0015 (8) | −0.0072 (8) | −0.0011 (8) |
C8 | 0.0400 (8) | 0.0382 (9) | 0.0464 (9) | −0.0009 (7) | −0.0030 (7) | 0.0056 (7) |
O1 | 0.0770 (10) | 0.0945 (12) | 0.0485 (8) | −0.0086 (9) | 0.0078 (7) | −0.0013 (8) |
C12 | 0.0490 (10) | 0.0496 (10) | 0.0455 (10) | −0.0053 (8) | −0.0021 (8) | 0.0086 (8) |
C11 | 0.0427 (10) | 0.0585 (12) | 0.0453 (10) | 0.0012 (8) | −0.0057 (7) | −0.0019 (8) |
C14 | 0.0547 (11) | 0.0518 (11) | 0.0558 (11) | 0.0035 (9) | −0.0008 (9) | 0.0213 (8) |
C7 | 0.0452 (10) | 0.0373 (9) | 0.0476 (10) | −0.0012 (7) | −0.0013 (8) | 0.0041 (7) |
C2 | 0.0629 (12) | 0.0484 (11) | 0.0635 (12) | 0.0078 (9) | −0.0119 (10) | −0.0070 (9) |
C5 | 0.0503 (10) | 0.0677 (13) | 0.0481 (10) | −0.0041 (9) | −0.0001 (9) | 0.0016 (9) |
C13 | 0.0505 (11) | 0.0781 (15) | 0.0508 (11) | 0.0003 (11) | −0.0066 (9) | −0.0080 (11) |
C9 | 0.0541 (11) | 0.0371 (9) | 0.0607 (12) | −0.0007 (8) | 0.0000 (9) | 0.0055 (8) |
C10 | 0.0545 (11) | 0.0474 (11) | 0.0600 (12) | 0.0036 (9) | −0.0063 (9) | −0.0085 (9) |
C15 | 0.0670 (13) | 0.0598 (13) | 0.0813 (15) | −0.0072 (10) | 0.0038 (11) | 0.0263 (11) |
C4 | 0.0539 (12) | 0.0902 (17) | 0.0589 (12) | 0.0050 (11) | 0.0047 (10) | −0.0172 (12) |
C3 | 0.0597 (12) | 0.0707 (14) | 0.0732 (14) | 0.0152 (11) | −0.0059 (11) | −0.0206 (12) |
S1—C7 | 1.7538 (18) | C14—H14A | 0.9700 |
S1—C1 | 1.756 (2) | C14—H14B | 0.9700 |
C6—C5 | 1.396 (3) | C2—C3 | 1.376 (3) |
C6—C1 | 1.399 (2) | C2—H2 | 0.9300 |
C6—N1 | 1.411 (2) | C5—C4 | 1.383 (3) |
N1—C8 | 1.392 (2) | C5—H5 | 0.9300 |
N1—C14 | 1.474 (2) | C13—H13 | 0.99 (3) |
C1—C2 | 1.382 (3) | C9—C10 | 1.376 (3) |
C8—C9 | 1.396 (3) | C9—H9 | 0.9300 |
C8—C7 | 1.412 (2) | C10—H10 | 0.9300 |
O1—C13 | 1.212 (3) | C15—H15A | 0.9600 |
C12—C7 | 1.372 (3) | C15—H15B | 0.9600 |
C12—C11 | 1.388 (3) | C15—H15C | 0.9600 |
C12—H12 | 0.9300 | C4—C3 | 1.366 (3) |
C11—C10 | 1.390 (3) | C4—H4 | 0.9300 |
C11—C13 | 1.463 (3) | C3—H3 | 0.9300 |
C14—C15 | 1.524 (3) | ||
C7—S1—C1 | 100.44 (8) | C3—C2—C1 | 120.8 (2) |
C5—C6—C1 | 117.13 (17) | C3—C2—H2 | 119.6 |
C5—C6—N1 | 121.61 (16) | C1—C2—H2 | 119.6 |
C1—C6—N1 | 121.24 (16) | C4—C5—C6 | 120.93 (19) |
C8—N1—C6 | 122.48 (14) | C4—C5—H5 | 119.5 |
C8—N1—C14 | 118.49 (15) | C6—C5—H5 | 119.5 |
C6—N1—C14 | 118.24 (15) | O1—C13—C11 | 124.4 (2) |
C2—C1—C6 | 120.97 (18) | O1—C13—H13 | 122.3 (17) |
C2—C1—S1 | 118.17 (15) | C11—C13—H13 | 113.3 (17) |
C6—C1—S1 | 120.58 (14) | C10—C9—C8 | 121.78 (17) |
N1—C8—C9 | 122.20 (15) | C10—C9—H9 | 119.1 |
N1—C8—C7 | 121.03 (15) | C8—C9—H9 | 119.1 |
C9—C8—C7 | 116.73 (16) | C9—C10—C11 | 120.97 (18) |
C7—C12—C11 | 121.50 (17) | C9—C10—H10 | 119.5 |
C7—C12—H12 | 119.3 | C11—C10—H10 | 119.5 |
C11—C12—H12 | 119.3 | C14—C15—H15A | 109.5 |
C12—C11—C10 | 117.92 (17) | C14—C15—H15B | 109.5 |
C12—C11—C13 | 120.29 (19) | H15A—C15—H15B | 109.5 |
C10—C11—C13 | 121.78 (19) | C14—C15—H15C | 109.5 |
N1—C14—C15 | 115.30 (16) | H15A—C15—H15C | 109.5 |
N1—C14—H14A | 108.4 | H15B—C15—H15C | 109.5 |
C15—C14—H14A | 108.4 | C3—C4—C5 | 121.2 (2) |
N1—C14—H14B | 108.4 | C3—C4—H4 | 119.4 |
C15—C14—H14B | 108.4 | C5—C4—H4 | 119.4 |
H14A—C14—H14B | 107.5 | C4—C3—C2 | 118.9 (2) |
C12—C7—C8 | 121.06 (16) | C4—C3—H3 | 120.5 |
C12—C7—S1 | 117.80 (13) | C2—C3—H3 | 120.5 |
C8—C7—S1 | 120.72 (14) | ||
C5—C6—N1—C8 | 155.35 (17) | N1—C8—C7—C12 | 177.55 (16) |
C1—C6—N1—C8 | −26.1 (2) | C9—C8—C7—C12 | −0.1 (3) |
C5—C6—N1—C14 | −14.3 (2) | N1—C8—C7—S1 | 5.2 (2) |
C1—C6—N1—C14 | 164.21 (16) | C9—C8—C7—S1 | −172.52 (13) |
C5—C6—C1—C2 | −2.4 (3) | C1—S1—C7—C12 | 157.90 (15) |
N1—C6—C1—C2 | 179.03 (16) | C1—S1—C7—C8 | −29.47 (16) |
C5—C6—C1—S1 | 171.37 (14) | C6—C1—C2—C3 | 2.3 (3) |
N1—C6—C1—S1 | −7.2 (2) | S1—C1—C2—C3 | −171.58 (16) |
C7—S1—C1—C2 | −155.68 (15) | C1—C6—C5—C4 | 0.5 (3) |
C7—S1—C1—C6 | 30.42 (16) | N1—C6—C5—C4 | 179.09 (17) |
C6—N1—C8—C9 | −155.31 (17) | C12—C11—C13—O1 | −2.6 (3) |
C14—N1—C8—C9 | 14.4 (3) | C10—C11—C13—O1 | 178.44 (19) |
C6—N1—C8—C7 | 27.1 (2) | N1—C8—C9—C10 | −175.86 (17) |
C14—N1—C8—C7 | −163.21 (16) | C7—C8—C9—C10 | 1.8 (3) |
C7—C12—C11—C10 | 2.1 (3) | C8—C9—C10—C11 | −1.5 (3) |
C7—C12—C11—C13 | −176.89 (17) | C12—C11—C10—C9 | −0.5 (3) |
C8—N1—C14—C15 | −84.5 (2) | C13—C11—C10—C9 | 178.53 (18) |
C6—N1—C14—C15 | 85.6 (2) | C6—C5—C4—C3 | 1.5 (3) |
C11—C12—C7—C8 | −1.8 (3) | C5—C4—C3—C2 | −1.6 (3) |
C11—C12—C7—S1 | 170.76 (14) | C1—C2—C3—C4 | −0.3 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C14—H14A···O1i | 0.97 | 2.64 | 3.563 (3) | 158 |
Symmetry code: (i) −x+1/2, −y+1, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C15H13NOS |
Mr | 255.32 |
Crystal system, space group | Orthorhombic, Pbca |
Temperature (K) | 296 |
a, b, c (Å) | 8.0867 (1), 15.3271 (3), 20.3369 (4) |
V (Å3) | 2520.67 (8) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.24 |
Crystal size (mm) | 0.20 × 0.10 × 0.10 |
Data collection | |
Diffractometer | Bruker SMART APEX |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.953, 0.976 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 17210, 2225, 1909 |
Rint | 0.028 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.041, 0.109, 1.08 |
No. of reflections | 2225 |
No. of parameters | 167 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.40, −0.42 |
Computer programs: SMART (Bruker, 2002), SAINT (Bruker, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
C14—H14A···O1i | 0.97 | 2.64 | 3.563 (3) | 158.3 |
Symmetry code: (i) −x+1/2, −y+1, z+1/2. |
Acknowledgements
We gratefully acknowledge the NSFC (grant Nos. 21071001, 50873001 and 20875001), the Science and Technological Fund of Anhui Province for Outstanding Youth (grant No. 10040606Y22) and the 211 Project of Anhui University for supporting this study.
References
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The title compound (I) is often used as intermediate in the synthesis of organic compounds with optical properties (Li et al., 2009a, b). Herewith we present its crystal structure.
In (I) (Fig.1), two benzene rings form the dihedral angles of 10.0 (8)° and 12.0 (8)°, respectively, with the thiomorpholine mean plane. The folding of the molecule is characterized by dihedral angle formed by two benzene rings, which is 21.1 (1) °. In the related compounds, 10-ethylphenothiazine (Chu et al., 1975) and 10-ethyl-3-nitrophenothiazine (Hdii et al., 1998), the corresponding dihedral angle is 44.9 (1) and 22.8 (1) °, respectively, showing that any substitution added to benzene ring flattens the tricycle. This tendency also observed in the structure of (E)-3-(10-ethyl-10H-phenothiazin-3-yl)acrylic acid (Li et al., 2009b), where these dihedral angles in two independent molecules are 25.3 (9) ° and 29.8 (8) °, respectively. The ethyl group in (I) is almost orthogonal to the thiazine ring, the torsion angle C6–N1—Cl4–C15 is 85.6 (1)°. While in 10-ethylphenothiazine (Chu et al., 1975), the corresponding angle is 146.1 (4) °, and in 10-ethyl-3-nitrophenothiazine (Hon et al., 1998) this angle is -84.9 (2)°. The aldehyde group is almost coplanar with its attached phenyl ring, the torsion angle C12–C11–C13–O1 being -2.59 °.
In the crystal, weak intermolecular C—H···O hydrogen bonds (Table 1) link molecules into chains along [001]. The crystal packing exhibits π···π interactions with the distance of 3.801 (5) Å between the centroids of benzene rings from the neighbouring molecules.