organic compounds
Methyl 2-{2-[(E)-(2-hydroxy-3-methoxybenzylidene)amino]ethylamino}cyclopentene-1-carbodithioate
aDepartment of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran, bDepartment of Chemistry, University of Lorestan, Lorestan, Iran, and cDipartimento di Chimica Inorganica, Vill. S. Agata, Salita Sperone 31, Universita di Messina, 98166 Messina, Italy
*Correspondence e-mail: saiedmenati@gmail.com
In the title Schiff base compound, C17H22N2O2S2, which adopts an E configuration with respect to the imine C=N double bond, the C=N and N—C bond distances are 1.2789 (16) and 1.4546 (16) Å, respectively. In the molecule there are intramolecular O—H⋯N and N—H⋯S hydrogen bonds, and the CH=N—C substituent is almost coplanar with the benzene ring [C—N—C—C torsion angle = −178.80 (11)°]. The crystal packing is stabilized by intermolecular C—H⋯O and C—H⋯π interactions involving the aromatic ring.
Related literature
For properties and applications of Schiff base compounds, see: Sabater et al. (1999); Di Bella & Fragala (2002); Lecren et al. (2007); Güngör & Gürkan (2010). For related structures, see: Pereira et al. (2008); Kumar et al. (1995); Asadi et al. (2009).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2008); cell SAINT (Bruker, 2008); 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
10.1107/S1600536811002972/su2251sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811002972/su2251Isup2.hkl
Methyl-2-{N-(2-aminoethane)}-amino-1-cyclopentenedithiocarboxylate (Hcden) was prepared by literature methods. The compounds (1), (2) and (3) were prepared by the addition of an equimolar amount of a methanolic solution of the appropriate benzaldehydr, 2-hydroxy-3-methoxybenzaldehyde, 3,5-di-tert-butyl-2-hydroxybenzaldehyde and 3-hydroxy-4-methoxybenzaldehyde, respectively, to a methanolic solution of Hcden. The products obtained were recrystallized from methanol/chloroform 1:1 (V:V).
The H-atoms were included in calculated positons and treated as riding atoms: O—H = 0.82 Å, N—H = 0.86 Å, C—H = 0.93, 0.96 and 0.97 Å for CH, CH3 and CH2 H-atons, respectively, with with Uiso(H) = k × Ueq(C), where k = 1.5 for OH and CH3 H-atoms, and k = 1.2 for all other H-atoms.
Data collection: APEX2 (Bruker, 2008); cell
SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); 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).C17H22N2O2S2 | Z = 2 |
Mr = 350.49 | F(000) = 372 |
Triclinic, P1 | Dx = 1.300 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.7933 (2) Å | Cell parameters from 9856 reflections |
b = 10.3486 (2) Å | θ = 2.7–29.0° |
c = 11.9532 (3) Å | µ = 0.31 mm−1 |
α = 108.038 (1)° | T = 296 K |
β = 93.349 (1)° | Prismatic, black |
γ = 100.296 (1)° | 0.56 × 0.45 × 0.34 mm |
V = 895.19 (4) Å3 |
Bruker APEXII CCD diffractometer | 4761 independent reflections |
Radiation source: fine-focus sealed tube | 4235 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.019 |
ϕ and ω scans | θmax = 29.1°, θmin = 2.7° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −10→10 |
Tmin = 0.678, Tmax = 0.746 | k = −14→14 |
34525 measured reflections | l = −16→16 |
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)] = 0.036 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.109 | H-atom parameters constrained |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0602P)2 + 0.160P] where P = (Fo2 + 2Fc2)/3 |
4761 reflections | (Δ/σ)max = 0.002 |
211 parameters | Δρmax = 0.32 e Å−3 |
0 restraints | Δρmin = −0.23 e Å−3 |
C17H22N2O2S2 | γ = 100.296 (1)° |
Mr = 350.49 | V = 895.19 (4) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.7933 (2) Å | Mo Kα radiation |
b = 10.3486 (2) Å | µ = 0.31 mm−1 |
c = 11.9532 (3) Å | T = 296 K |
α = 108.038 (1)° | 0.56 × 0.45 × 0.34 mm |
β = 93.349 (1)° |
Bruker APEXII CCD diffractometer | 4761 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 4235 reflections with I > 2σ(I) |
Tmin = 0.678, Tmax = 0.746 | Rint = 0.019 |
34525 measured reflections |
R[F2 > 2σ(F2)] = 0.036 | 0 restraints |
wR(F2) = 0.109 | H-atom parameters constrained |
S = 1.05 | Δρmax = 0.32 e Å−3 |
4761 reflections | Δρmin = −0.23 e Å−3 |
211 parameters |
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. |
x | y | z | Uiso*/Ueq | ||
S1 | 0.34940 (5) | 0.35488 (3) | 0.20000 (3) | 0.05017 (11) | |
S2 | 0.29009 (5) | 0.64159 (4) | 0.22423 (3) | 0.05473 (11) | |
O1 | −0.09386 (17) | 1.17333 (16) | 0.37397 (12) | 0.0836 (4) | |
O2 | 0.00507 (12) | 1.04545 (10) | 0.17106 (8) | 0.0511 (2) | |
H2 | 0.0495 | 1.0077 | 0.1123 | 0.077* | |
N1 | 0.21120 (14) | 0.62955 (11) | −0.03025 (9) | 0.0435 (2) | |
H1 | 0.2184 | 0.6727 | 0.0445 | 0.052* | |
N2 | 0.23401 (13) | 0.92834 (10) | 0.05271 (10) | 0.0433 (2) | |
C1 | 0.3828 (3) | 0.4423 (2) | 0.35518 (14) | 0.0785 (5) | |
H1A | 0.4744 | 0.5239 | 0.3731 | 0.118* | |
H1B | 0.4162 | 0.3817 | 0.3953 | 0.118* | |
H1C | 0.2761 | 0.4687 | 0.3810 | 0.118* | |
C2 | 0.29524 (14) | 0.47869 (11) | 0.13773 (10) | 0.0375 (2) | |
C3 | 0.26114 (14) | 0.42536 (11) | 0.01462 (10) | 0.0365 (2) | |
C4 | 0.22487 (13) | 0.49886 (11) | −0.06190 (9) | 0.0360 (2) | |
C5 | 0.20752 (18) | 0.40864 (13) | −0.18882 (10) | 0.0465 (3) | |
H5A | 0.3113 | 0.4324 | −0.2252 | 0.056* | |
H5B | 0.1054 | 0.4178 | −0.2339 | 0.056* | |
C6 | 0.1871 (2) | 0.26237 (15) | −0.18208 (13) | 0.0625 (4) | |
H6A | 0.2465 | 0.2067 | −0.2422 | 0.075* | |
H6B | 0.0639 | 0.2176 | −0.1938 | 0.075* | |
C7 | 0.2702 (2) | 0.27904 (13) | −0.05846 (11) | 0.0503 (3) | |
H7A | 0.2050 | 0.2117 | −0.0272 | 0.060* | |
H7B | 0.3911 | 0.2676 | −0.0596 | 0.060* | |
C8 | 0.18503 (17) | 0.70860 (13) | −0.10912 (11) | 0.0461 (3) | |
H8A | 0.0618 | 0.7121 | −0.1197 | 0.055* | |
H8B | 0.2189 | 0.6634 | −0.1861 | 0.055* | |
C9 | 0.29423 (16) | 0.85464 (13) | −0.05752 (12) | 0.0453 (3) | |
H9A | 0.4167 | 0.8509 | −0.0428 | 0.054* | |
H9B | 0.2850 | 0.9041 | −0.1138 | 0.054* | |
C10 | 0.33243 (16) | 0.95933 (13) | 0.15062 (12) | 0.0454 (3) | |
H10 | 0.4421 | 0.9356 | 0.1493 | 0.054* | |
C11 | 0.27848 (17) | 1.03029 (12) | 0.26352 (11) | 0.0461 (3) | |
C12 | 0.11586 (17) | 1.06993 (12) | 0.26856 (11) | 0.0449 (3) | |
C13 | 0.0665 (2) | 1.13836 (16) | 0.37903 (14) | 0.0592 (3) | |
C14 | 0.1797 (3) | 1.16566 (19) | 0.48081 (14) | 0.0744 (5) | |
H14 | 0.1466 | 1.2100 | 0.5541 | 0.089* | |
C15 | 0.3412 (3) | 1.1281 (2) | 0.47537 (15) | 0.0780 (5) | |
H15 | 0.4165 | 1.1487 | 0.5447 | 0.094* | |
C16 | 0.3908 (2) | 1.06093 (17) | 0.36880 (15) | 0.0652 (4) | |
H16 | 0.4993 | 1.0353 | 0.3658 | 0.078* | |
C17 | −0.1453 (3) | 1.2484 (3) | 0.4833 (2) | 0.1217 (11) | |
H17A | −0.1475 | 1.1949 | 0.5363 | 0.183* | |
H17B | −0.2603 | 1.2659 | 0.4696 | 0.183* | |
H17C | −0.0630 | 1.3351 | 0.5180 | 0.183* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0626 (2) | 0.04592 (18) | 0.04539 (17) | 0.01308 (14) | 0.00025 (14) | 0.01981 (13) |
S2 | 0.0818 (3) | 0.04600 (18) | 0.03766 (16) | 0.02337 (16) | 0.00973 (15) | 0.00942 (13) |
O1 | 0.0729 (7) | 0.0936 (10) | 0.0702 (8) | 0.0283 (7) | 0.0167 (6) | −0.0007 (7) |
O2 | 0.0478 (5) | 0.0523 (5) | 0.0496 (5) | 0.0163 (4) | −0.0034 (4) | 0.0101 (4) |
N1 | 0.0560 (6) | 0.0407 (5) | 0.0373 (5) | 0.0170 (4) | 0.0067 (4) | 0.0138 (4) |
N2 | 0.0452 (5) | 0.0389 (5) | 0.0488 (5) | 0.0130 (4) | 0.0043 (4) | 0.0167 (4) |
C1 | 0.1227 (16) | 0.0735 (11) | 0.0439 (7) | 0.0214 (10) | 0.0018 (9) | 0.0266 (7) |
C2 | 0.0363 (5) | 0.0385 (5) | 0.0389 (5) | 0.0075 (4) | 0.0053 (4) | 0.0142 (4) |
C3 | 0.0356 (5) | 0.0345 (5) | 0.0381 (5) | 0.0071 (4) | 0.0032 (4) | 0.0105 (4) |
C4 | 0.0321 (4) | 0.0382 (5) | 0.0369 (5) | 0.0070 (4) | 0.0033 (4) | 0.0112 (4) |
C5 | 0.0549 (7) | 0.0438 (6) | 0.0359 (5) | 0.0074 (5) | −0.0013 (5) | 0.0088 (5) |
C6 | 0.0919 (11) | 0.0417 (7) | 0.0447 (7) | 0.0121 (7) | −0.0077 (7) | 0.0050 (5) |
C7 | 0.0654 (8) | 0.0371 (6) | 0.0449 (6) | 0.0130 (5) | −0.0009 (5) | 0.0085 (5) |
C8 | 0.0547 (6) | 0.0463 (6) | 0.0427 (6) | 0.0181 (5) | 0.0050 (5) | 0.0183 (5) |
C9 | 0.0466 (6) | 0.0467 (6) | 0.0522 (7) | 0.0177 (5) | 0.0123 (5) | 0.0240 (5) |
C10 | 0.0434 (6) | 0.0392 (6) | 0.0575 (7) | 0.0114 (4) | 0.0007 (5) | 0.0208 (5) |
C11 | 0.0531 (6) | 0.0378 (5) | 0.0486 (6) | 0.0098 (5) | −0.0049 (5) | 0.0174 (5) |
C12 | 0.0517 (6) | 0.0365 (5) | 0.0459 (6) | 0.0074 (5) | 0.0000 (5) | 0.0146 (5) |
C13 | 0.0685 (9) | 0.0524 (7) | 0.0531 (8) | 0.0121 (6) | 0.0091 (6) | 0.0119 (6) |
C14 | 0.1066 (14) | 0.0683 (10) | 0.0437 (7) | 0.0165 (10) | 0.0050 (8) | 0.0136 (7) |
C15 | 0.1076 (14) | 0.0729 (11) | 0.0508 (8) | 0.0220 (10) | −0.0196 (9) | 0.0196 (8) |
C16 | 0.0735 (9) | 0.0595 (8) | 0.0619 (9) | 0.0192 (7) | −0.0176 (7) | 0.0202 (7) |
C17 | 0.0930 (15) | 0.127 (2) | 0.1020 (17) | 0.0243 (15) | 0.0333 (13) | −0.0292 (16) |
S1—C2 | 1.7666 (11) | C6—H6A | 0.9700 |
S1—C1 | 1.7740 (16) | C6—H6B | 0.9700 |
S2—C2 | 1.6918 (12) | C7—H7A | 0.9700 |
O1—C13 | 1.365 (2) | C7—H7B | 0.9700 |
O1—C17 | 1.420 (2) | C8—C9 | 1.5134 (18) |
O2—C12 | 1.3377 (15) | C8—H8A | 0.9700 |
O2—H2 | 0.8201 | C8—H8B | 0.9700 |
N1—C4 | 1.3126 (15) | C9—H9A | 0.9700 |
N1—C8 | 1.4541 (15) | C9—H9B | 0.9700 |
N1—H1 | 0.8595 | C10—C11 | 1.4493 (19) |
N2—C10 | 1.2789 (16) | C10—H10 | 0.9300 |
N2—C9 | 1.4546 (16) | C11—C12 | 1.3991 (18) |
C1—H1A | 0.9600 | C11—C16 | 1.4055 (18) |
C1—H1B | 0.9600 | C12—C13 | 1.4037 (19) |
C1—H1C | 0.9600 | C13—C14 | 1.382 (2) |
C2—C3 | 1.3926 (15) | C14—C15 | 1.381 (3) |
C3—C4 | 1.4046 (15) | C14—H14 | 0.9300 |
C3—C7 | 1.5124 (16) | C15—C16 | 1.364 (3) |
C4—C5 | 1.4984 (15) | C15—H15 | 0.9300 |
C5—C6 | 1.521 (2) | C16—H16 | 0.9300 |
C5—H5A | 0.9700 | C17—H17A | 0.9600 |
C5—H5B | 0.9700 | C17—H17B | 0.9600 |
C6—C7 | 1.5243 (19) | C17—H17C | 0.9600 |
C2—S1—C1 | 104.65 (7) | N1—C8—C9 | 109.96 (10) |
C13—O1—C17 | 116.50 (17) | N1—C8—H8A | 109.7 |
C12—O2—H2 | 109.5 | C9—C8—H8A | 109.7 |
C4—N1—C8 | 126.44 (10) | N1—C8—H8B | 109.7 |
C4—N1—H1 | 116.8 | C9—C8—H8B | 109.7 |
C8—N1—H1 | 116.7 | H8A—C8—H8B | 108.2 |
C10—N2—C9 | 119.45 (11) | N2—C9—C8 | 110.36 (10) |
S1—C1—H1A | 109.5 | N2—C9—H9A | 109.6 |
S1—C1—H1B | 109.5 | C8—C9—H9A | 109.6 |
H1A—C1—H1B | 109.5 | N2—C9—H9B | 109.6 |
S1—C1—H1C | 109.5 | C8—C9—H9B | 109.6 |
H1A—C1—H1C | 109.5 | H9A—C9—H9B | 108.1 |
H1B—C1—H1C | 109.5 | N2—C10—C11 | 122.07 (11) |
C3—C2—S2 | 126.69 (9) | N2—C10—H10 | 119.0 |
C3—C2—S1 | 112.17 (8) | C11—C10—H10 | 119.0 |
S2—C2—S1 | 121.14 (7) | C12—C11—C16 | 119.61 (14) |
C2—C3—C4 | 126.43 (10) | C12—C11—C10 | 120.49 (11) |
C2—C3—C7 | 124.42 (10) | C16—C11—C10 | 119.90 (13) |
C4—C3—C7 | 109.03 (10) | O2—C12—C11 | 122.13 (12) |
N1—C4—C3 | 126.24 (10) | O2—C12—C13 | 118.47 (12) |
N1—C4—C5 | 122.93 (10) | C11—C12—C13 | 119.40 (12) |
C3—C4—C5 | 110.81 (10) | O1—C13—C14 | 125.93 (15) |
C4—C5—C6 | 103.91 (10) | O1—C13—C12 | 114.69 (14) |
C4—C5—H5A | 111.0 | C14—C13—C12 | 119.38 (15) |
C6—C5—H5A | 111.0 | C15—C14—C13 | 121.06 (16) |
C4—C5—H5B | 111.0 | C15—C14—H14 | 119.5 |
C6—C5—H5B | 111.0 | C13—C14—H14 | 119.5 |
H5A—C5—H5B | 109.0 | C16—C15—C14 | 120.29 (15) |
C5—C6—C7 | 105.86 (10) | C16—C15—H15 | 119.9 |
C5—C6—H6A | 110.6 | C14—C15—H15 | 119.9 |
C7—C6—H6A | 110.6 | C15—C16—C11 | 120.26 (16) |
C5—C6—H6B | 110.6 | C15—C16—H16 | 119.9 |
C7—C6—H6B | 110.6 | C11—C16—H16 | 119.9 |
H6A—C6—H6B | 108.7 | O1—C17—H17A | 109.5 |
C3—C7—C6 | 104.22 (10) | O1—C17—H17B | 109.5 |
C3—C7—H7A | 110.9 | H17A—C17—H17B | 109.5 |
C6—C7—H7A | 110.9 | O1—C17—H17C | 109.5 |
C3—C7—H7B | 110.9 | H17A—C17—H17C | 109.5 |
C6—C7—H7B | 110.9 | H17B—C17—H17C | 109.5 |
H7A—C7—H7B | 108.9 | ||
C1—S1—C2—C3 | −178.88 (11) | N1—C8—C9—N2 | −64.63 (13) |
C1—S1—C2—S2 | 1.58 (11) | C9—N2—C10—C11 | −178.80 (11) |
S2—C2—C3—C4 | 3.59 (17) | N2—C10—C11—C12 | −1.23 (19) |
S1—C2—C3—C4 | −175.92 (9) | N2—C10—C11—C16 | 179.42 (12) |
S2—C2—C3—C7 | 179.08 (10) | C16—C11—C12—O2 | 178.90 (13) |
S1—C2—C3—C7 | −0.43 (15) | C10—C11—C12—O2 | −0.45 (18) |
C8—N1—C4—C3 | 175.70 (11) | C16—C11—C12—C13 | −0.74 (19) |
C8—N1—C4—C5 | −2.59 (19) | C10—C11—C12—C13 | 179.91 (12) |
C2—C3—C4—N1 | −2.38 (19) | C17—O1—C13—C14 | 2.1 (3) |
C7—C3—C4—N1 | −178.45 (11) | C17—O1—C13—C12 | −177.20 (19) |
C2—C3—C4—C5 | 176.08 (11) | O2—C12—C13—O1 | −0.1 (2) |
C7—C3—C4—C5 | 0.01 (13) | C11—C12—C13—O1 | 179.54 (13) |
N1—C4—C5—C6 | −166.44 (12) | O2—C12—C13—C14 | −179.49 (14) |
C3—C4—C5—C6 | 15.04 (14) | C11—C12—C13—C14 | 0.2 (2) |
C4—C5—C6—C7 | −23.83 (16) | O1—C13—C14—C15 | −178.55 (18) |
C2—C3—C7—C6 | 168.79 (12) | C12—C13—C14—C15 | 0.7 (3) |
C4—C3—C7—C6 | −15.05 (15) | C13—C14—C15—C16 | −1.1 (3) |
C5—C6—C7—C3 | 23.93 (16) | C14—C15—C16—C11 | 0.5 (3) |
C4—N1—C8—C9 | −140.36 (12) | C12—C11—C16—C15 | 0.4 (2) |
C10—N2—C9—C8 | 111.43 (12) | C10—C11—C16—C15 | 179.77 (15) |
Cg is the centroid of the C11–C16 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···S2 | 0.86 | 2.32 | 3.0275 (11) | 140 |
O2—H2···N2 | 0.82 | 1.85 | 2.5806 (14) | 147 |
C9—H9B···O2i | 0.97 | 2.51 | 3.1166 (16) | 120 |
C1—H1C···Cgii | 0.96 | 2.95 | 3.617 (2) | 128 |
Symmetry codes: (i) −x, −y+2, −z; (ii) x, y−1, z. |
Experimental details
Crystal data | |
Chemical formula | C17H22N2O2S2 |
Mr | 350.49 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 296 |
a, b, c (Å) | 7.7933 (2), 10.3486 (2), 11.9532 (3) |
α, β, γ (°) | 108.038 (1), 93.349 (1), 100.296 (1) |
V (Å3) | 895.19 (4) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.31 |
Crystal size (mm) | 0.56 × 0.45 × 0.34 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.678, 0.746 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 34525, 4761, 4235 |
Rint | 0.019 |
(sin θ/λ)max (Å−1) | 0.684 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.036, 0.109, 1.05 |
No. of reflections | 4761 |
No. of parameters | 211 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.32, −0.23 |
Computer programs: APEX2 (Bruker, 2008), SAINT (Bruker, 2008), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
Cg is the centroid of the C11–C16 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···S2 | 0.86 | 2.32 | 3.0275 (11) | 140 |
O2—H2···N2 | 0.82 | 1.85 | 2.5806 (14) | 147 |
C9—H9B···O2i | 0.97 | 2.51 | 3.1166 (16) | 120 |
C1—H1C···Cgii | 0.96 | 2.95 | 3.617 (2) | 128 |
Symmetry codes: (i) −x, −y+2, −z; (ii) x, y−1, z. |
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Reflecting their usual relative ease of synthesis and excellent imine bonding properties, Schiff base compounds have been extensively investigated for more than a century. They have been employed in areas that include analytical and bioinorganic chemistry, non-linear optics, fluorescence studies, catalysis and materials chemistry (Sabater et al., 1999; Di Bella et al., 2002; Lecren et al., 2007). The development of simple methods to produce asymmetric products remains an area of considerable research activity (Güngör et al., 2010). In the other hand, it is well known that N and S atoms play a key role in the coordination of metals at the active sites of numerous metallobiomolecules. We are particularly interested in the synthesis and characterization of such asymmetric Schiff base compounds.
Three new asymmetric Schiff base compounds, (E)-methyl 2-(2-(2-hydroxy-3-methoxybenzylideneamino)ethylamino)cyclopent-1- enecarbodithioate (1), (E)-methyl 2-(2-(3,5-di-tert-butyl-2-hydroxybenzylideneamino)ethylamino) cyclopent-1-enecarbodithioate (2) and (E)-methyl 2-(2-(3-hydroxy-4-methoxybenzylideneamino)ethylamino) cyclopent-1- enecarbodithioate (3) have been prepared. Herein we report on the crystal structure of compound (1).
The molecular structure of compound (1) (Fig. 1) is similar to those of analogous derivatives (Pereira et al., 2008; Kumar et al., 1995; Asadi et al., 2009). The title molecule adopts an E configuration with respect to the imine C═N double bond, with a C11—C10—N2—C9 torsion angle of -178.80 (11)°. The C12—O2 bond distance of 1.3377 (15) Å suggests that it is the phenol-imine tautomer. The contraction of the C10═N2 bond [1.2789 (16) Å] is also in agreement with the phenol-imine tautomer. As for the methoxy group, the O1—C13 and O1—C17 bond distances are 1.365 (2) and 1.420 (2) Å, respectively, and the C13—O1—C17 bond angle is 116.50 (17) Å. The planarity of the molecule is stabilized by intramolecular O—H···N and N–H···S hydrogen bonds (Fig. 1 and Table 1). However, there are no intermolecular hydrogen bonds associated with the methoxy group.
The crystal packing in compound (1) is stabilized by C—H···O and C—H···π interactions; the later involving the aromatic ring (C11—C16) and the C1—H1C H-atom (Fig. 2 and Table 1).