organic compounds
2-Methyl-3-(10H-phenothiazin-10-yl)buta-1,3-diene-1,1,4,4-tetracarbonitrile
aDepartment of Material Science and Chemistry, Wakayama University, Sakaedani, Wakayama 640-8510, Japan
*Correspondence e-mail: okuno@center.wakayama-u.ac.jp
In the title compound, C21H11N5S, the phenothiazine unit has a butterfly structure, and the central six-membered ring adopts a boat conformation. The dihedral angle between the benzene rings is 127.64 (6)°, which is smaller than those reported for similar compounds because of the steric repulsion between the phenothiazine and its tetracyano-1,3-butadiene substituent. The dicyanovinyl groups are almost orthogonal to one another, making a dihedral angle of 80.58 (6)°. In the crystal, the molecules are aligned along the b axis. Four kinds of weak C—H⋯N interactions are recognized, one of which connects the molecules into a one-dimensional array and the remaining three link these arrays.
Related literature
For applications of tetracyano-1,3-butadienes in photonics and non-linear optics, see: Faupel et al. (2007). For the preparation and structure of 10-(prop-1-yn-1-yl)-10H-phenothiazine, see: Zaugg et al. (1958); Umezono & Okuno (2012). For the structures of other related N-substituted phenothiazines, see: Chu & Van der Helm (1974, 1975); Tokunaga & Okuno (2012).
Experimental
Crystal data
|
Data collection: CrystalClear (Rigaku, 2008); cell CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: CrystalStructure (Rigaku, 2010).
Supporting information
https://doi.org/10.1107/S1600536813008799/sj5308sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536813008799/sj5308Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536813008799/sj5308Isup3.cml
A solution of 10-(prop-1-yn-1-yl)-10H-phenothiazine (0.50 g, 2.1 mmol) (Zaugg et al., 1958) in dichloromethane (25 ml) was added to a solution of ethene-1,1,2,2-tetracarbonitrile (0.27 g, 2.1 mmol) in dichloromethane (150 ml). The solution was stirred for a day and was concentrated by evaporation. The residue was purified by
(GPC) to give the title compound as pale blue powder (0.48 g, 62%). Single crystals with sufficient quality for X-ray crystallographic analysis were prepared by recrystallization from an acetonitrile solution.The C-bound H atoms were placed at ideal positions and were refined as riding on their parent C atoms. Uiso(H) values of the H atoms were set at 1.2Ueq(parent atom).
Tetracyano-1,3-butadienes, which are prepared by TCNE addition to acetylene compounds carrying an electron donating part, have been attracted interest from the viewpoint of applications in photonics and nonlinear optics (Faupel et al., 2007). The title compound, C21H11N5S1, is a TCNE adduct of 10-(prop-1-yn-1-yl)-10H-phenothiazine which is known as the first ynamine compound (Zaugg et al., 1958).
The phenothiazine moiety has a butterfly structure, and the central six-membered ring adopts a boat conformation (Fig. 1). The dihedral angle between the C1—C6 and C7—C12 planes is 127.64 (6)°. This is smaller than angles reported for related phenothiazine systems (Chu & Helm, 1974, 1975; Umezono & Okuno, 2012; Tokunaga & Okuno, 2012), and is presumably because of the steric repulsion between the phenothiazine ring system and its tetracyano-1,3-butadiene substituent. The structure around the N1 is pyrimidal and the N1 atom lies 0.1440 (14) Å out of the C1/C12/C13 plane. This plane is inclined at 10.84 (4)° to the C13/C16—C18/N2/N3 dicyanovinyl plane (r.m.s. deviation = 0.0095 Å), indicating good π-conjugation. This latter plane is approximately orthogonal to the other C14/C19—C21/N4/N5 plane (r.m.s. deviation = 0.0170 Å), with a dihedral angle of 80.58 (6)° between them.
The molecules align along the b axis. Four kinds of weak C—H···N interactions are recognized in each molecule, one of which connects the molecules within the one-dimensional array and the ramaining three link these arrays (Fig. 2, Table 1).
For applications of tetracyano-1,3-butadienes in photonics and non-linear optics, see: Faupel et al. (2007). For the preparation and structure of 10-(prop-1-yn-1-yl)-10H-phenothiazine, see: Zaugg et al. (1958); Umezono & Okuno (2012). For the structures of other related N-substituted phenothiazines, see: Chu & Van der Helm (1974, 1975); Tokunaga & Okuno (2012).
Data collection: CrystalClear (Rigaku, 2008); cell
CrystalClear (Rigaku, 2008); data reduction: CrystalClear (Rigaku, 2008); program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: CrystalStructure (Rigaku, 2010).Fig. 1. The asymmetric unit of the title compound with atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level and H atoms are shown as small spheres. | |
Fig. 2. A view of the intermolecular interactions of the title compound. [Symmetry codes: (i) x, y + 1, z (ii) -x, y - 1/2, -z + 1 (iii) -x + 1, y - 1/2, -z (iv) -x + 1, y + 1/2, -z.] |
C21H11N5S | F(000) = 376.00 |
Mr = 365.41 | Dx = 1.342 Mg m−3 |
Monoclinic, P21 | Mo Kα radiation, λ = 0.71075 Å |
Hall symbol: P 2yb | Cell parameters from 3683 reflections |
a = 10.217 (3) Å | θ = 1.8–30.7° |
b = 7.848 (3) Å | µ = 0.19 mm−1 |
c = 11.369 (3) Å | T = 93 K |
β = 97.316 (4)° | Block, pale blue |
V = 904.2 (5) Å3 | 0.10 × 0.10 × 0.05 mm |
Z = 2 |
Rigaku Saturn724+ diffractometer | Rint = 0.022 |
Detector resolution: 28.445 pixels mm-1 | θmax = 27.5° |
ω scans | h = −12→13 |
7524 measured reflections | k = −9→10 |
3753 independent reflections | l = −14→14 |
3494 reflections with F2 > 2σ(F2) |
Refinement on F2 | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.032 | H-atom parameters constrained |
wR(F2) = 0.078 | w = 1/[σ2(Fo2) + (0.045P)2 + 0.1327P] where P = (Fo2 + 2Fc2)/3 |
S = 1.04 | (Δ/σ)max < 0.001 |
3753 reflections | Δρmax = 0.21 e Å−3 |
244 parameters | Δρmin = −0.25 e Å−3 |
1 restraint | Absolute structure: Flack (1983), 1526 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: 0.01 (6) |
Secondary atom site location: difference Fourier map |
C21H11N5S | V = 904.2 (5) Å3 |
Mr = 365.41 | Z = 2 |
Monoclinic, P21 | Mo Kα radiation |
a = 10.217 (3) Å | µ = 0.19 mm−1 |
b = 7.848 (3) Å | T = 93 K |
c = 11.369 (3) Å | 0.10 × 0.10 × 0.05 mm |
β = 97.316 (4)° |
Rigaku Saturn724+ diffractometer | 3494 reflections with F2 > 2σ(F2) |
7524 measured reflections | Rint = 0.022 |
3753 independent reflections |
R[F2 > 2σ(F2)] = 0.032 | H-atom parameters constrained |
wR(F2) = 0.078 | Δρmax = 0.21 e Å−3 |
S = 1.04 | Δρmin = −0.25 e Å−3 |
3753 reflections | Absolute structure: Flack (1983), 1526 Friedel pairs |
244 parameters | Absolute structure parameter: 0.01 (6) |
1 restraint |
Refinement. Refinement was performed using all reflections. The weighted R-factor (wR) and goodness of fit (S) are based on F2. R-factor (gt) are based on F. The threshold expression of F2 > 2.0 σ(F2) is used only for calculating R-factor (gt). |
x | y | z | Uiso*/Ueq | ||
S1 | 0.46875 (4) | 0.28150 (5) | 0.24265 (4) | 0.02108 (10) | |
N1 | 0.27521 (13) | 0.00720 (18) | 0.24818 (12) | 0.0165 (3) | |
N2 | 0.25743 (15) | −0.0784 (3) | −0.09700 (14) | 0.0250 (4) | |
N3 | −0.12618 (16) | 0.0506 (3) | −0.02155 (14) | 0.0300 (4) | |
N4 | −0.03764 (19) | −0.3121 (3) | 0.2637 (2) | 0.0404 (5) | |
N5 | −0.20384 (18) | 0.1361 (3) | 0.42695 (17) | 0.0368 (5) | |
C1 | 0.30948 (16) | 0.0842 (3) | 0.36326 (14) | 0.0173 (4) | |
C2 | 0.26062 (16) | 0.0219 (3) | 0.46368 (14) | 0.0192 (4) | |
C3 | 0.29033 (17) | 0.1081 (3) | 0.57034 (15) | 0.0239 (4) | |
C4 | 0.36780 (17) | 0.2539 (3) | 0.57534 (15) | 0.0253 (4) | |
C5 | 0.42255 (17) | 0.3100 (3) | 0.47617 (16) | 0.0235 (4) | |
C6 | 0.39519 (16) | 0.2229 (3) | 0.36953 (14) | 0.0181 (4) | |
C7 | 0.48704 (16) | 0.0732 (3) | 0.18623 (13) | 0.0167 (4) | |
C8 | 0.59958 (17) | 0.0265 (3) | 0.13638 (14) | 0.0199 (4) | |
C9 | 0.61205 (17) | −0.1403 (3) | 0.09858 (15) | 0.0209 (4) | |
C10 | 0.51615 (17) | −0.2620 (3) | 0.11218 (15) | 0.0210 (4) | |
C11 | 0.40235 (15) | −0.2157 (3) | 0.16050 (13) | 0.0190 (3) | |
C12 | 0.38819 (16) | −0.0473 (3) | 0.19417 (14) | 0.0165 (4) | |
C13 | 0.15512 (16) | 0.0349 (2) | 0.18619 (14) | 0.0162 (4) | |
C14 | 0.05534 (16) | 0.1133 (3) | 0.25659 (14) | 0.0180 (4) | |
C15 | 0.05982 (17) | 0.3019 (3) | 0.27492 (15) | 0.0218 (4) | |
C16 | 0.11722 (16) | 0.0065 (3) | 0.06727 (15) | 0.0169 (4) | |
C17 | 0.19996 (17) | −0.0424 (3) | −0.01964 (15) | 0.0190 (4) | |
C18 | −0.01790 (17) | 0.0327 (3) | 0.01951 (14) | 0.0208 (4) | |
C19 | −0.03508 (17) | 0.0124 (3) | 0.29768 (15) | 0.0202 (4) | |
C20 | −0.03738 (18) | −0.1681 (3) | 0.27904 (18) | 0.0253 (4) | |
C21 | −0.13076 (18) | 0.0814 (3) | 0.36816 (17) | 0.0260 (4) | |
H2 | 0.2078 | −0.0780 | 0.4593 | 0.0231* | |
H3 | 0.2577 | 0.0674 | 0.6398 | 0.0287* | |
H4 | 0.3837 | 0.3162 | 0.6474 | 0.0303* | |
H5 | 0.4783 | 0.4073 | 0.4814 | 0.0282* | |
H8 | 0.6668 | 0.1077 | 0.1284 | 0.0239* | |
H9 | 0.6875 | −0.1719 | 0.0627 | 0.0250* | |
H10 | 0.5281 | −0.3765 | 0.0886 | 0.0252* | |
H11 | 0.3361 | −0.2976 | 0.1702 | 0.0228* | |
H15A | 0.0728 | 0.3268 | 0.3601 | 0.0261* | |
H15B | −0.0234 | 0.3525 | 0.2389 | 0.0261* | |
H15C | 0.1330 | 0.3500 | 0.2378 | 0.0261* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0262 (2) | 0.0173 (2) | 0.0209 (2) | −0.00254 (18) | 0.00752 (15) | 0.00042 (16) |
N1 | 0.0147 (7) | 0.0192 (8) | 0.0154 (7) | −0.0000 (6) | 0.0014 (5) | −0.0034 (6) |
N2 | 0.0252 (8) | 0.0294 (9) | 0.0208 (8) | 0.0023 (7) | 0.0040 (6) | −0.0002 (7) |
N3 | 0.0214 (8) | 0.0444 (11) | 0.0240 (8) | 0.0023 (8) | 0.0017 (7) | −0.0006 (7) |
N4 | 0.0411 (11) | 0.0224 (10) | 0.0632 (14) | −0.0058 (8) | 0.0282 (10) | −0.0079 (9) |
N5 | 0.0355 (10) | 0.0319 (11) | 0.0470 (11) | −0.0014 (8) | 0.0204 (9) | −0.0128 (8) |
C1 | 0.0180 (8) | 0.0184 (9) | 0.0151 (8) | 0.0022 (7) | 0.0008 (6) | −0.0008 (7) |
C2 | 0.0175 (8) | 0.0192 (9) | 0.0215 (8) | 0.0015 (7) | 0.0040 (7) | 0.0028 (7) |
C3 | 0.0217 (9) | 0.0338 (11) | 0.0168 (8) | 0.0078 (8) | 0.0047 (7) | 0.0035 (7) |
C4 | 0.0232 (9) | 0.0339 (12) | 0.0180 (8) | 0.0067 (8) | −0.0003 (7) | −0.0069 (8) |
C5 | 0.0203 (8) | 0.0246 (11) | 0.0251 (9) | −0.0011 (8) | 0.0009 (7) | −0.0074 (7) |
C6 | 0.0180 (8) | 0.0194 (8) | 0.0171 (8) | 0.0018 (7) | 0.0030 (7) | 0.0009 (6) |
C7 | 0.0187 (8) | 0.0174 (8) | 0.0136 (7) | 0.0018 (7) | 0.0002 (6) | 0.0012 (6) |
C8 | 0.0175 (8) | 0.0266 (9) | 0.0154 (8) | 0.0004 (8) | 0.0018 (6) | 0.0037 (7) |
C9 | 0.0183 (8) | 0.0294 (10) | 0.0152 (8) | 0.0064 (8) | 0.0034 (6) | 0.0018 (7) |
C10 | 0.0221 (9) | 0.0224 (10) | 0.0172 (8) | 0.0048 (7) | −0.0020 (7) | −0.0039 (6) |
C11 | 0.0177 (8) | 0.0210 (8) | 0.0175 (7) | 0.0000 (8) | −0.0009 (6) | −0.0019 (7) |
C12 | 0.0156 (8) | 0.0210 (8) | 0.0126 (7) | 0.0030 (7) | 0.0002 (6) | −0.0011 (6) |
C13 | 0.0180 (8) | 0.0109 (8) | 0.0199 (8) | −0.0016 (7) | 0.0033 (6) | −0.0001 (6) |
C14 | 0.0188 (9) | 0.0173 (9) | 0.0173 (8) | 0.0015 (7) | −0.0001 (6) | −0.0016 (6) |
C15 | 0.0243 (9) | 0.0173 (10) | 0.0244 (8) | 0.0010 (8) | 0.0057 (7) | −0.0003 (7) |
C16 | 0.0159 (8) | 0.0155 (8) | 0.0195 (8) | −0.0017 (7) | 0.0033 (6) | 0.0002 (7) |
C17 | 0.0184 (8) | 0.0193 (9) | 0.0186 (8) | −0.0000 (7) | 0.0003 (7) | 0.0007 (6) |
C18 | 0.0230 (10) | 0.0238 (9) | 0.0159 (8) | 0.0027 (8) | 0.0037 (7) | −0.0016 (7) |
C19 | 0.0197 (8) | 0.0179 (9) | 0.0234 (8) | 0.0010 (7) | 0.0045 (7) | −0.0050 (7) |
C20 | 0.0208 (9) | 0.0246 (10) | 0.0331 (10) | −0.0042 (7) | 0.0139 (8) | −0.0049 (8) |
C21 | 0.0234 (10) | 0.0231 (10) | 0.0329 (10) | −0.0047 (8) | 0.0090 (8) | −0.0066 (8) |
S1—C6 | 1.7701 (18) | C11—C12 | 1.389 (3) |
S1—C7 | 1.7745 (19) | C13—C14 | 1.505 (3) |
N1—C1 | 1.443 (2) | C13—C16 | 1.376 (3) |
N1—C12 | 1.440 (3) | C14—C15 | 1.495 (3) |
N1—C13 | 1.352 (2) | C14—C19 | 1.345 (3) |
N2—C17 | 1.153 (3) | C16—C17 | 1.432 (3) |
N3—C18 | 1.153 (3) | C16—C18 | 1.432 (3) |
N4—C20 | 1.143 (3) | C19—C20 | 1.432 (3) |
N5—C21 | 1.147 (3) | C19—C21 | 1.446 (3) |
C1—C2 | 1.392 (3) | C2—H2 | 0.950 |
C1—C6 | 1.393 (3) | C3—H3 | 0.950 |
C2—C3 | 1.388 (3) | C4—H4 | 0.950 |
C3—C4 | 1.388 (3) | C5—H5 | 0.950 |
C4—C5 | 1.392 (3) | C8—H8 | 0.950 |
C5—C6 | 1.389 (3) | C9—H9 | 0.950 |
C7—C8 | 1.394 (3) | C10—H10 | 0.950 |
C7—C12 | 1.395 (3) | C11—H11 | 0.950 |
C8—C9 | 1.389 (3) | C15—H15A | 0.980 |
C9—C10 | 1.391 (3) | C15—H15B | 0.980 |
C10—C11 | 1.396 (3) | C15—H15C | 0.980 |
C6—S1—C7 | 97.49 (9) | C13—C16—C18 | 119.09 (16) |
C1—N1—C12 | 113.32 (13) | C17—C16—C18 | 113.70 (15) |
C1—N1—C13 | 120.28 (14) | N2—C17—C16 | 174.02 (18) |
C12—N1—C13 | 123.30 (14) | N3—C18—C16 | 178.0 (2) |
N1—C1—C2 | 121.70 (15) | C14—C19—C20 | 122.01 (18) |
N1—C1—C6 | 116.87 (15) | C14—C19—C21 | 120.99 (18) |
C2—C1—C6 | 121.43 (15) | C20—C19—C21 | 116.93 (17) |
C1—C2—C3 | 118.95 (17) | N4—C20—C19 | 179.1 (3) |
C2—C3—C4 | 119.83 (17) | N5—C21—C19 | 178.0 (2) |
C3—C4—C5 | 120.88 (17) | C1—C2—H2 | 120.520 |
C4—C5—C6 | 119.61 (17) | C3—C2—H2 | 120.526 |
S1—C6—C1 | 119.39 (13) | C2—C3—H3 | 120.088 |
S1—C6—C5 | 121.62 (14) | C4—C3—H3 | 120.079 |
C1—C6—C5 | 118.99 (16) | C3—C4—H4 | 119.564 |
S1—C7—C8 | 121.29 (14) | C5—C4—H4 | 119.554 |
S1—C7—C12 | 119.38 (13) | C4—C5—H5 | 120.189 |
C8—C7—C12 | 119.32 (16) | C6—C5—H5 | 120.199 |
C7—C8—C9 | 119.11 (17) | C7—C8—H8 | 120.448 |
C8—C9—C10 | 121.28 (17) | C9—C8—H8 | 120.446 |
C9—C10—C11 | 119.94 (18) | C8—C9—H9 | 119.360 |
C10—C11—C12 | 118.51 (17) | C10—C9—H9 | 119.363 |
N1—C12—C7 | 116.93 (15) | C9—C10—H10 | 120.029 |
N1—C12—C11 | 121.16 (15) | C11—C10—H10 | 120.035 |
C7—C12—C11 | 121.71 (16) | C10—C11—H11 | 120.744 |
N1—C13—C14 | 114.81 (14) | C12—C11—H11 | 120.746 |
N1—C13—C16 | 127.51 (16) | C14—C15—H15A | 109.470 |
C14—C13—C16 | 117.63 (14) | C14—C15—H15B | 109.468 |
C13—C14—C15 | 117.89 (15) | C14—C15—H15C | 109.466 |
C13—C14—C19 | 119.08 (16) | H15A—C15—H15B | 109.474 |
C15—C14—C19 | 123.01 (17) | H15A—C15—H15C | 109.475 |
C13—C16—C17 | 127.17 (15) | H15B—C15—H15C | 109.474 |
D—H···A | D—H | H···A | D···A | D—H···A |
C15—H15B···N4i | 0.98 | 2.65 | 3.186 (3) | 114 |
C2—H2···N5ii | 0.95 | 2.59 | 3.352 (3) | 137 |
C10—H10···N2iii | 0.95 | 2.70 | 3.413 (3) | 133 |
C8—H8···N2iv | 0.95 | 2.62 | 3.480 (3) | 151 |
Symmetry codes: (i) x, y+1, z; (ii) −x, y−1/2, −z+1; (iii) −x+1, y−1/2, −z; (iv) −x+1, y+1/2, −z. |
Experimental details
Crystal data | |
Chemical formula | C21H11N5S |
Mr | 365.41 |
Crystal system, space group | Monoclinic, P21 |
Temperature (K) | 93 |
a, b, c (Å) | 10.217 (3), 7.848 (3), 11.369 (3) |
β (°) | 97.316 (4) |
V (Å3) | 904.2 (5) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.19 |
Crystal size (mm) | 0.10 × 0.10 × 0.05 |
Data collection | |
Diffractometer | Rigaku Saturn724+ |
Absorption correction | – |
No. of measured, independent and observed [F2 > 2σ(F2)] reflections | 7524, 3753, 3494 |
Rint | 0.022 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.032, 0.078, 1.04 |
No. of reflections | 3753 |
No. of parameters | 244 |
No. of restraints | 1 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.21, −0.25 |
Absolute structure | Flack (1983), 1526 Friedel pairs |
Absolute structure parameter | 0.01 (6) |
Computer programs: CrystalClear (Rigaku, 2008), SIR92 (Altomare et al., 1994), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 2012), CrystalStructure (Rigaku, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
C15—H15B···N4i | 0.98 | 2.654 | 3.186 (3) | 114 |
C2—H2···N5ii | 0.95 | 2.593 | 3.352 (3) | 137 |
C10—H10···N2iii | 0.95 | 2.696 | 3.413 (3) | 133 |
C8—H8···N2iv | 0.95 | 2.620 | 3.480 (3) | 151 |
Symmetry codes: (i) x, y+1, z; (ii) −x, y−1/2, −z+1; (iii) −x+1, y−1/2, −z; (iv) −x+1, y+1/2, −z. |
Acknowledgements
This work was supported by Research for Promoting Technological Seeds from the Japan Science and Technology Agency (JST).
References
Altomare, A., Cascarano, G., Giacovazzo, C., Guagliardi, A., Burla, M. C., Polidori, G. & Camalli, M. (1994). J. Appl. Cryst. 27, 435. CrossRef Web of Science IUCr Journals Google Scholar
Chu, S. S. C. & Van der Helm, D. (1974). Acta Cryst. B30, 2489–2490. CSD CrossRef IUCr Journals Web of Science Google Scholar
Chu, S. S. C. & Van der Helm, D. (1975). Acta Cryst. B31, 1179–1183. CSD CrossRef CAS IUCr Journals Web of Science Google Scholar
Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849–854. Web of Science CrossRef CAS IUCr Journals Google Scholar
Faupel, F., Dimitrakopoulos, C., Kahn, A. & Wöll, C. (2007). Chem. Rev. 107, 923–1386. Google Scholar
Flack, H. D. (1983). Acta Cryst. A39, 876–881. CrossRef CAS Web of Science IUCr Journals Google Scholar
Rigaku (2008). CrystalClear. Rigaku Corporation, Tokyo, Japan. Google Scholar
Rigaku (2010). CrystalStructure. Rigaku Corporation, Tokyo, Japan. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Tokunaga, E. & Okuno, T. (2012). Acta Cryst. E68, o3369. CSD CrossRef IUCr Journals Google Scholar
Umezono, S. & Okuno, T. (2012). Acta Cryst. E68, o2790. CSD CrossRef IUCr Journals Google Scholar
Zaugg, H. E., Sweett, L. R. & Stone, G. R. (1958). J. Org. Chem. 23, 1389–1390. CrossRef CAS Web of Science Google Scholar
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.
Tetracyano-1,3-butadienes, which are prepared by TCNE addition to acetylene compounds carrying an electron donating part, have been attracted interest from the viewpoint of applications in photonics and nonlinear optics (Faupel et al., 2007). The title compound, C21H11N5S1, is a TCNE adduct of 10-(prop-1-yn-1-yl)-10H-phenothiazine which is known as the first ynamine compound (Zaugg et al., 1958).
The phenothiazine moiety has a butterfly structure, and the central six-membered ring adopts a boat conformation (Fig. 1). The dihedral angle between the C1—C6 and C7—C12 planes is 127.64 (6)°. This is smaller than angles reported for related phenothiazine systems (Chu & Helm, 1974, 1975; Umezono & Okuno, 2012; Tokunaga & Okuno, 2012), and is presumably because of the steric repulsion between the phenothiazine ring system and its tetracyano-1,3-butadiene substituent. The structure around the N1 is pyrimidal and the N1 atom lies 0.1440 (14) Å out of the C1/C12/C13 plane. This plane is inclined at 10.84 (4)° to the C13/C16—C18/N2/N3 dicyanovinyl plane (r.m.s. deviation = 0.0095 Å), indicating good π-conjugation. This latter plane is approximately orthogonal to the other C14/C19—C21/N4/N5 plane (r.m.s. deviation = 0.0170 Å), with a dihedral angle of 80.58 (6)° between them.
The molecules align along the b axis. Four kinds of weak C—H···N interactions are recognized in each molecule, one of which connects the molecules within the one-dimensional array and the ramaining three link these arrays (Fig. 2, Table 1).