organic compounds
of 4-{[(2,4-dihydroxybenzylidene)amino]methyl}cyclohexanecarboxylic acid
aDepartment of Chemistry, Institute of Natural Sciences, University of Gujrat, Gujrat 50700, Pakistan, and bDepartment of physics, University of Sargodha, Sargodha, Punjab, Pakistan
*Correspondence e-mail: dmntahir_uos@yahoo.com
In the title compound, C15H19NO4, the cyclohexyl ring adopts a chair conformation with both exocyclic C—C bonds in equatorial orientations. The dihedral angle between the basal plane of cyclohexyl ring and the 2,4-dihydroxybenzaldehyde moiety is 84.13 (13)°. An intramolecular O—H⋯N hydrogen bonds closes an S(6) ring. In the crystal, Oc—H⋯Op (c = carboxylic acid, p = phenol) hydrogen bonds link the molecules into [100] C(13) chains whereas an Op—H⋯Oc hydrogen bond generates [101] C(15) chains. Together, these bonds generate (010) sheets incorporating R22(20) loops. Weak C—H⋯O and C—H⋯π interactions also occur.
Keywords: crystal structure; Schiff base; benzaldehyde; hydrogen bonding.
CCDC reference: 1438286
1. Related literature
For the crystal structures of related et al. (2006, 2007); Nisar et al. (2011).
see: Shuja2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: APEX2 (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014/6 (Sheldrick, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and PLATON (Spek, 2009); software used to prepare material for publication: WinGX (Farrugia, 2012) and PLATON.
Supporting information
CCDC reference: 1438286
https://doi.org/10.1107/S2056989015022343/hb7548sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989015022343/hb7548Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S2056989015022343/hb7548Isup3.cml
Tranexamic acid (0.786 g, 5 mmol) and 2,4-dihydroxybenzaldehyde (0.661 g, 5 mmol) were disolved in 10 ml distilled water and 10 ml ethanol separately. These mixture were mixed and refluxed for 4 h to yield orange precipitate. The precipitates obtained were filtered and dried from which light orange plates of (I) were obtained after recrystallization in ethanol after one week.
Yield: 83%
Melting point:512 K.
The coordinates of H-atoms of carboxylic acid were refined with constraints. The H-atoms were positioned geometrically (C–H = 0.93 - 0.98 Å, O–H = 0.82 Å) and refined as riding with Uiso(H) = xUeq(C, O), where x = 1.5 for hydroxy and x = 1.2 for other H-atoms.
The title compound (I, Fig. 1) is the Schiff base ligand synthesized from tranexamic acid and 2,4-dihydroxybenzaldehyde. The reported crystal structures of the
of tranexamic acid are 2-[(4-carboxycyclohexyl)methylammoniomethyl]-6-hydroxyphenolate (Shuja et al., 2006), 4-((E)-(5-bromo-2-hydroxybenzylidene)aminomethyl)cyclohexane-1-carboxylic acid (Shuja et al., 2007) and 4-({[(E)-pyridin-3-ylmethylidene]amino}-methyl)cyclohexanecarboxylic acid (Nisar et al., 2011). The title compound is synthesized for various studies and complexation with different metals.In (I), the basal plane A (C3/C4/C6/C7) of cyclohexyl ring and the part of 2,4-dihydroxybenzaldehyde B (C9—C14) are planar with r. m. s. deviation of 0.0101 Å and 0.0387 Å, respectively. The dihedral angle between A/B is 84.13 (13)°. The apical C-atoms C2 and C5 are almost at an equal distance of -0.680 (6) Å and 0.648 (6) Å, respectively from the plane A. The carboxylic part C (O1/C1/O2) is oriented at dihedral angles of 31.6 (3)° from planes A.
There exist S(6) ring motif due to O—H···N interactions (Table 1, Fig. 1). Each molecule is linked to four molecules due to O—H···O interactions (Table 1, Fig. 2) with C(13) and C(15) chains. C(13) chains exist from the 2-hydroxy and carboxyl hydroxy groups, where as C(15) chains are created when 4-hydroxy and carbonyl O-atom interlink. The C9—H9···O1iii [iii = -x, -y + 1, -z] interactions generate R22(20) ring motif (Table 1, Fig. 2). Similarly, the O4—H4···O2ii [ii = x + 1, -y + 3/2, z + 1/2], C9—H9···O1iii and C14—H14···O3iv [iv = -x + 1, y - 1/2, -z + 1/2] interactions complete R33(15) ring motifs. In this way, the alternate R33(15) and R22(20) ring motifs stabilize the molecules in the form of 2-dimensional network with base vectors [1 0 0], [0 0 1] in the plane (0 1 0). A C—H···π interaction (Table 1) is also involved in the packing.
For the crystal structures of related
see: Shuja et al. (2006, 2007); Nisar et al. (2011).Data collection: APEX2 (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014/6 (Sheldrick, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and PLATON (Spek, 2009); software used to prepare material for publication: WinGX (Farrugia, 2012) and PLATON (Spek, 2009).Fig. 1. View of the title compound with displacement ellipsoids drawn at the 50% probability level. The dotted line represents the intramolecular hydrogen bonding. | |
Fig. 2. A partial packing diagram, showig that molecules form R22(20) and R33(15) ring motifs. H atoms not involved in hydrogen-bonding interactions are omitted for clarity. |
C15H19NO4 | F(000) = 592 |
Mr = 277.31 | Dx = 1.298 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
a = 6.2399 (17) Å | Cell parameters from 1222 reflections |
b = 10.222 (2) Å | θ = 2.7–25.3° |
c = 22.251 (6) Å | µ = 0.09 mm−1 |
β = 90.232 (8)° | T = 296 K |
V = 1419.2 (6) Å3 | Plate, light orange |
Z = 4 | 0.33 × 0.27 × 0.14 mm |
Bruker Kappa APEXII CCD diffractometer | 2580 independent reflections |
Radiation source: fine-focus sealed tube | 1222 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.095 |
Detector resolution: 7.80 pixels mm-1 | θmax = 25.3°, θmin = 2.7° |
ω scans | h = −7→7 |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | k = −12→8 |
Tmin = 0.970, Tmax = 0.988 | l = −27→27 |
10670 measured reflections |
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)] = 0.077 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.214 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.01 | w = 1/[σ2(Fo2) + (0.0891P)2] where P = (Fo2 + 2Fc2)/3 |
2580 reflections | (Δ/σ)max < 0.001 |
186 parameters | Δρmax = 0.35 e Å−3 |
0 restraints | Δρmin = −0.26 e Å−3 |
C15H19NO4 | V = 1419.2 (6) Å3 |
Mr = 277.31 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 6.2399 (17) Å | µ = 0.09 mm−1 |
b = 10.222 (2) Å | T = 296 K |
c = 22.251 (6) Å | 0.33 × 0.27 × 0.14 mm |
β = 90.232 (8)° |
Bruker Kappa APEXII CCD diffractometer | 2580 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | 1222 reflections with I > 2σ(I) |
Tmin = 0.970, Tmax = 0.988 | Rint = 0.095 |
10670 measured reflections |
R[F2 > 2σ(F2)] = 0.077 | 0 restraints |
wR(F2) = 0.214 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.01 | Δρmax = 0.35 e Å−3 |
2580 reflections | Δρmin = −0.26 e Å−3 |
186 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 | ||
O1 | 0.0521 (6) | 0.7966 (3) | −0.09932 (14) | 0.0576 (10) | |
H1 | 0.082 (8) | 0.840 (5) | −0.132 (2) | 0.086* | |
O2 | −0.2047 (6) | 0.9366 (3) | −0.07558 (15) | 0.0717 (11) | |
O3 | 0.0919 (5) | 0.5993 (3) | 0.30231 (12) | 0.0465 (8) | |
H3 | 0.0041 | 0.6040 | 0.2749 | 0.070* | |
O4 | 0.7509 (5) | 0.3799 (3) | 0.33996 (14) | 0.0549 (9) | |
H4 | 0.7673 | 0.4399 | 0.3640 | 0.082* | |
N1 | −0.1192 (6) | 0.5339 (3) | 0.20228 (15) | 0.0426 (10) | |
C1 | −0.1074 (8) | 0.8366 (4) | −0.06681 (19) | 0.0441 (11) | |
C2 | −0.1625 (7) | 0.7441 (4) | −0.01567 (18) | 0.0430 (11) | |
H2 | −0.1976 | 0.6593 | −0.0337 | 0.052* | |
C3 | −0.3547 (7) | 0.7867 (5) | 0.0196 (2) | 0.0604 (14) | |
H3A | −0.4763 | 0.7979 | −0.0072 | 0.072* | |
H3B | −0.3256 | 0.8700 | 0.0389 | 0.072* | |
C4 | −0.4078 (7) | 0.6832 (5) | 0.06750 (19) | 0.0563 (13) | |
H4A | −0.5306 | 0.7123 | 0.0905 | 0.068* | |
H4B | −0.4464 | 0.6020 | 0.0477 | 0.068* | |
C5 | −0.2214 (6) | 0.6584 (4) | 0.10995 (18) | 0.0425 (11) | |
H5 | −0.1913 | 0.7394 | 0.1320 | 0.051* | |
C6 | −0.0247 (7) | 0.6216 (4) | 0.07511 (18) | 0.0498 (12) | |
H6A | −0.0470 | 0.5367 | 0.0566 | 0.060* | |
H6B | 0.0958 | 0.6142 | 0.1026 | 0.060* | |
C7 | 0.0299 (7) | 0.7226 (4) | 0.02570 (18) | 0.0470 (12) | |
H7A | 0.0706 | 0.8049 | 0.0442 | 0.056* | |
H7B | 0.1505 | 0.6913 | 0.0024 | 0.056* | |
C8 | −0.2828 (7) | 0.5528 (4) | 0.15533 (18) | 0.0454 (12) | |
H8A | −0.4172 | 0.5768 | 0.1741 | 0.054* | |
H8B | −0.3048 | 0.4708 | 0.1343 | 0.054* | |
C9 | 0.0253 (7) | 0.4422 (4) | 0.19944 (18) | 0.0418 (11) | |
H9 | 0.0123 | 0.3825 | 0.1681 | 0.050* | |
C10 | 0.1980 (7) | 0.4246 (4) | 0.23882 (18) | 0.0377 (11) | |
C11 | 0.2338 (7) | 0.5082 (3) | 0.28987 (19) | 0.0388 (11) | |
C12 | 0.4181 (7) | 0.4917 (4) | 0.32423 (18) | 0.0407 (11) | |
H12 | 0.4411 | 0.5447 | 0.3576 | 0.049* | |
C13 | 0.5676 (8) | 0.3976 (4) | 0.30947 (19) | 0.0419 (11) | |
C14 | 0.5317 (8) | 0.3123 (4) | 0.26061 (19) | 0.0460 (12) | |
H14 | 0.6298 | 0.2467 | 0.2516 | 0.055* | |
C15 | 0.3522 (7) | 0.3274 (4) | 0.2270 (2) | 0.0466 (12) | |
H15 | 0.3296 | 0.2712 | 0.1947 | 0.056* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.077 (3) | 0.055 (2) | 0.041 (2) | 0.0053 (17) | 0.0165 (19) | 0.0106 (15) |
O2 | 0.078 (3) | 0.070 (2) | 0.068 (2) | 0.026 (2) | 0.014 (2) | 0.0257 (19) |
O3 | 0.054 (2) | 0.0480 (18) | 0.0371 (18) | 0.0076 (16) | −0.0024 (15) | −0.0005 (14) |
O4 | 0.052 (2) | 0.053 (2) | 0.059 (2) | 0.0024 (16) | −0.0121 (18) | −0.0066 (16) |
N1 | 0.042 (2) | 0.049 (2) | 0.037 (2) | −0.0004 (18) | 0.0041 (19) | 0.0091 (17) |
C1 | 0.051 (3) | 0.045 (3) | 0.036 (3) | −0.005 (2) | −0.002 (2) | 0.001 (2) |
C2 | 0.044 (3) | 0.050 (3) | 0.036 (2) | −0.001 (2) | −0.003 (2) | 0.006 (2) |
C3 | 0.049 (3) | 0.081 (3) | 0.051 (3) | 0.021 (3) | 0.004 (3) | 0.011 (3) |
C4 | 0.031 (3) | 0.091 (4) | 0.046 (3) | 0.004 (3) | 0.006 (2) | 0.013 (3) |
C5 | 0.039 (3) | 0.051 (3) | 0.038 (3) | 0.004 (2) | 0.001 (2) | 0.000 (2) |
C6 | 0.045 (3) | 0.064 (3) | 0.040 (3) | 0.005 (2) | 0.002 (2) | 0.012 (2) |
C7 | 0.038 (3) | 0.063 (3) | 0.040 (3) | −0.004 (2) | −0.002 (2) | 0.009 (2) |
C8 | 0.041 (3) | 0.054 (3) | 0.042 (3) | 0.000 (2) | 0.005 (2) | 0.005 (2) |
C9 | 0.049 (3) | 0.044 (3) | 0.032 (3) | −0.010 (2) | 0.003 (2) | −0.001 (2) |
C10 | 0.044 (3) | 0.035 (2) | 0.035 (2) | −0.003 (2) | 0.003 (2) | −0.0015 (19) |
C11 | 0.053 (3) | 0.027 (2) | 0.037 (3) | −0.001 (2) | 0.012 (2) | 0.0063 (19) |
C12 | 0.053 (3) | 0.034 (2) | 0.035 (3) | −0.005 (2) | −0.005 (2) | −0.0015 (19) |
C13 | 0.049 (3) | 0.034 (2) | 0.043 (3) | −0.006 (2) | 0.000 (2) | 0.003 (2) |
C14 | 0.054 (3) | 0.032 (2) | 0.052 (3) | 0.002 (2) | 0.010 (3) | −0.006 (2) |
C15 | 0.056 (3) | 0.036 (2) | 0.047 (3) | −0.005 (2) | 0.003 (3) | −0.010 (2) |
O1—C1 | 1.299 (5) | C5—C8 | 1.528 (5) |
O1—H1 | 0.88 (5) | C5—H5 | 0.9800 |
O2—C1 | 1.205 (5) | C6—C7 | 1.547 (5) |
O3—C11 | 1.316 (4) | C6—H6A | 0.9700 |
O3—H3 | 0.8200 | C6—H6B | 0.9700 |
O4—C13 | 1.340 (5) | C7—H7A | 0.9700 |
O4—H4 | 0.8200 | C7—H7B | 0.9700 |
N1—C9 | 1.303 (5) | C8—H8A | 0.9700 |
N1—C8 | 1.470 (5) | C8—H8B | 0.9700 |
C1—C2 | 1.520 (5) | C9—C10 | 1.398 (6) |
C2—C3 | 1.501 (5) | C9—H9 | 0.9300 |
C2—C7 | 1.526 (6) | C10—C15 | 1.409 (5) |
C2—H2 | 0.9800 | C10—C11 | 1.438 (5) |
C3—C4 | 1.538 (6) | C11—C12 | 1.388 (6) |
C3—H3A | 0.9700 | C12—C13 | 1.381 (5) |
C3—H3B | 0.9700 | C12—H12 | 0.9300 |
C4—C5 | 1.517 (6) | C13—C14 | 1.411 (5) |
C4—H4A | 0.9700 | C14—C15 | 1.353 (6) |
C4—H4B | 0.9700 | C14—H14 | 0.9300 |
C5—C6 | 1.502 (5) | C15—H15 | 0.9300 |
C1—O1—H1 | 118 (3) | C7—C6—H6B | 109.1 |
C11—O3—H3 | 109.5 | H6A—C6—H6B | 107.8 |
C13—O4—H4 | 109.5 | C2—C7—C6 | 110.5 (3) |
C9—N1—C8 | 122.6 (4) | C2—C7—H7A | 109.6 |
O2—C1—O1 | 124.3 (4) | C6—C7—H7A | 109.6 |
O2—C1—C2 | 122.3 (4) | C2—C7—H7B | 109.6 |
O1—C1—C2 | 113.4 (4) | C6—C7—H7B | 109.6 |
C3—C2—C1 | 113.2 (4) | H7A—C7—H7B | 108.1 |
C3—C2—C7 | 110.8 (4) | N1—C8—C5 | 112.8 (3) |
C1—C2—C7 | 111.2 (3) | N1—C8—H8A | 109.0 |
C3—C2—H2 | 107.1 | C5—C8—H8A | 109.0 |
C1—C2—H2 | 107.1 | N1—C8—H8B | 109.0 |
C7—C2—H2 | 107.1 | C5—C8—H8B | 109.0 |
C2—C3—C4 | 109.7 (4) | H8A—C8—H8B | 107.8 |
C2—C3—H3A | 109.7 | N1—C9—C10 | 126.5 (4) |
C4—C3—H3A | 109.7 | N1—C9—H9 | 116.8 |
C2—C3—H3B | 109.7 | C10—C9—H9 | 116.8 |
C4—C3—H3B | 109.7 | C9—C10—C15 | 119.9 (4) |
H3A—C3—H3B | 108.2 | C9—C10—C11 | 122.4 (4) |
C5—C4—C3 | 112.3 (4) | C15—C10—C11 | 117.5 (4) |
C5—C4—H4A | 109.1 | O3—C11—C12 | 121.8 (4) |
C3—C4—H4A | 109.1 | O3—C11—C10 | 119.0 (4) |
C5—C4—H4B | 109.1 | C12—C11—C10 | 119.3 (4) |
C3—C4—H4B | 109.1 | C13—C12—C11 | 120.8 (4) |
H4A—C4—H4B | 107.9 | C13—C12—H12 | 119.6 |
C6—C5—C4 | 110.3 (3) | C11—C12—H12 | 119.6 |
C6—C5—C8 | 111.8 (3) | O4—C13—C12 | 123.4 (4) |
C4—C5—C8 | 109.6 (3) | O4—C13—C14 | 116.1 (4) |
C6—C5—H5 | 108.3 | C12—C13—C14 | 120.6 (4) |
C4—C5—H5 | 108.3 | C15—C14—C13 | 118.9 (4) |
C8—C5—H5 | 108.3 | C15—C14—H14 | 120.5 |
C5—C6—C7 | 112.5 (3) | C13—C14—H14 | 120.5 |
C5—C6—H6A | 109.1 | C14—C15—C10 | 122.8 (4) |
C7—C6—H6A | 109.1 | C14—C15—H15 | 118.6 |
C5—C6—H6B | 109.1 | C10—C15—H15 | 118.6 |
O2—C1—C2—C3 | 3.2 (6) | C8—N1—C9—C10 | 173.6 (4) |
O1—C1—C2—C3 | −176.7 (4) | N1—C9—C10—C15 | −174.5 (4) |
O2—C1—C2—C7 | −122.3 (5) | N1—C9—C10—C11 | 1.4 (6) |
O1—C1—C2—C7 | 57.8 (5) | C9—C10—C11—O3 | 4.4 (6) |
C1—C2—C3—C4 | 176.2 (4) | C15—C10—C11—O3 | −179.5 (3) |
C7—C2—C3—C4 | −58.1 (5) | C9—C10—C11—C12 | −174.8 (4) |
C2—C3—C4—C5 | 57.8 (5) | C15—C10—C11—C12 | 1.3 (5) |
C3—C4—C5—C6 | −55.2 (5) | O3—C11—C12—C13 | −178.3 (3) |
C3—C4—C5—C8 | −178.7 (3) | C10—C11—C12—C13 | 0.8 (6) |
C4—C5—C6—C7 | 53.5 (5) | C11—C12—C13—O4 | 178.0 (4) |
C8—C5—C6—C7 | 175.7 (4) | C11—C12—C13—C14 | −2.8 (6) |
C3—C2—C7—C6 | 56.7 (5) | O4—C13—C14—C15 | −178.2 (4) |
C1—C2—C7—C6 | −176.5 (4) | C12—C13—C14—C15 | 2.5 (6) |
C5—C6—C7—C2 | −54.6 (5) | C13—C14—C15—C10 | −0.3 (6) |
C9—N1—C8—C5 | −96.8 (5) | C9—C10—C15—C14 | 174.6 (4) |
C6—C5—C8—N1 | 63.9 (5) | C11—C10—C15—C14 | −1.5 (6) |
C4—C5—C8—N1 | −173.5 (3) |
Cg2 is the centroid of the C10–C15 benzene ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O3i | 0.88 (5) | 1.58 (5) | 2.447 (4) | 168 (5) |
O3—H3···N1 | 0.82 | 1.92 | 2.667 (4) | 150 |
O4—H4···O2ii | 0.82 | 1.85 | 2.669 (4) | 174 |
C9—H9···O1iii | 0.93 | 2.42 | 3.338 (5) | 170 |
C14—H14···O3iv | 0.93 | 2.60 | 3.499 (5) | 164 |
C5—H5···Cg2v | 0.98 | 2.97 | 3.772 (5) | 140 |
Symmetry codes: (i) x, −y+3/2, z−1/2; (ii) x+1, −y+3/2, z+1/2; (iii) −x, −y+1, −z; (iv) −x+1, y−1/2, −z+1/2; (v) −x, y+1/2, −z+1/2. |
Cg2 is the centroid of the C10–C15 benzene ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O3i | 0.88 (5) | 1.58 (5) | 2.447 (4) | 168 (5) |
O3—H3···N1 | 0.82 | 1.92 | 2.667 (4) | 150 |
O4—H4···O2ii | 0.82 | 1.85 | 2.669 (4) | 174 |
C9—H9···O1iii | 0.93 | 2.42 | 3.338 (5) | 170 |
C14—H14···O3iv | 0.93 | 2.60 | 3.499 (5) | 164 |
C5—H5···Cg2v | 0.98 | 2.97 | 3.772 (5) | 140 |
Symmetry codes: (i) x, −y+3/2, z−1/2; (ii) x+1, −y+3/2, z+1/2; (iii) −x, −y+1, −z; (iv) −x+1, y−1/2, −z+1/2; (v) −x, y+1/2, −z+1/2. |
Acknowledgements
The authors acknowledge the provision of funds for the purchase of diffractometer and encouragement by the Ex-Vice Chancellor, University of Sargodha, Pakistan.
References
Bruker (2005). SADABS. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Bruker (2007). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849–854. Web of Science CrossRef CAS IUCr Journals Google Scholar
Nisar, M., Ali, I., Tahir, M. N., Qayum, M. & Marwat, I. K. (2011). Acta Cryst. E67, o1058. Web of Science CSD CrossRef IUCr Journals Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Sheldrick, G. M. (2015). Acta Cryst. C71, 3–8. Web of Science CrossRef IUCr Journals Google Scholar
Shuja, S., Ali, S., Khalid, N., Labat, G. & Stoeckli-Evans, H. (2006). Acta Cryst. E62, o4786–o4788. Web of Science CSD CrossRef IUCr Journals Google Scholar
Shuja, S., Ali, S., Khalid, N. & Parvez, M. (2007). Acta Cryst. E63, o879–o880. Web of Science CSD CrossRef IUCr Journals Google Scholar
Spek, A. L. (2009). Acta Cryst. D65, 148–155. Web of Science CrossRef CAS IUCr Journals Google Scholar
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The title compound (I, Fig. 1) is the Schiff base ligand synthesized from tranexamic acid and 2,4-dihydroxybenzaldehyde. The reported crystal structures of the Schiff bases of tranexamic acid are 2-[(4-carboxycyclohexyl)methylammoniomethyl]-6-hydroxyphenolate (Shuja et al., 2006), 4-((E)-(5-bromo-2-hydroxybenzylidene)aminomethyl)cyclohexane-1-carboxylic acid (Shuja et al., 2007) and 4-({[(E)-pyridin-3-ylmethylidene]amino}-methyl)cyclohexanecarboxylic acid (Nisar et al., 2011). The title compound is synthesized for various studies and complexation with different metals.
In (I), the basal plane A (C3/C4/C6/C7) of cyclohexyl ring and the part of 2,4-dihydroxybenzaldehyde B (C9—C14) are planar with r. m. s. deviation of 0.0101 Å and 0.0387 Å, respectively. The dihedral angle between A/B is 84.13 (13)°. The apical C-atoms C2 and C5 are almost at an equal distance of -0.680 (6) Å and 0.648 (6) Å, respectively from the plane A. The carboxylic part C (O1/C1/O2) is oriented at dihedral angles of 31.6 (3)° from planes A.
There exist S(6) ring motif due to O—H···N interactions (Table 1, Fig. 1). Each molecule is linked to four molecules due to O—H···O interactions (Table 1, Fig. 2) with C(13) and C(15) chains. C(13) chains exist from the 2-hydroxy and carboxyl hydroxy groups, where as C(15) chains are created when 4-hydroxy and carbonyl O-atom interlink. The C9—H9···O1iii [iii = -x, -y + 1, -z] interactions generate R22(20) ring motif (Table 1, Fig. 2). Similarly, the O4—H4···O2ii [ii = x + 1, -y + 3/2, z + 1/2], C9—H9···O1iii and C14—H14···O3iv [iv = -x + 1, y - 1/2, -z + 1/2] interactions complete R33(15) ring motifs. In this way, the alternate R33(15) and R22(20) ring motifs stabilize the molecules in the form of 2-dimensional network with base vectors [1 0 0], [0 0 1] in the plane (0 1 0). A C—H···π interaction (Table 1) is also involved in the packing.