organic compounds
Acridinium 3-carboxypyrazine-2-carboxylate
aYoung Researchers Club, Islamic Azad University, North Tehran Branch, Tehran, Iran, bDepartment of Chemistry, Faculty of Science, Islamic Azad University, Khorramabad Branch, Khorramabad, Iran, and cInstitut de Physique, Universite de Neuchâtel, Rue Emile-Argand 11, CP 158, CH-2009 Neuchâtel, Switzerland
*Correspondence e-mail: attar_jafar@yahoo.com
The title 13H10N+·C6H3N2O4−, contains a protonated acridine cation and a 3-carboxypyrazine-2-carboxylate monoanion, which are linked together through O—H⋯O, N—H⋯O and weak C—H⋯O hydrogen bonds. These hydrogen bonds generate a C(10) chain graph-set motif. The is further stabilized by extensive π–π stacking interactions between nearly parallel [dihedral angle = 1.21(2)°] acridine systems. The shortest distance between the centroids of the six-membered rings within the cations is 3.6315 (8) Å. In addition, C—H⋯π edge-to-face interactions are present.
CRelated literature
For the biological activity of acridines, see: Talacki et al. (1974); Achenson (1956); Fan et al. (1997); Bandoli et al. (1994). For ion pairs reported from pyrazine-2,3-dicarboxylic acid, pz-2,3-dcH2, with various organic bases such as 8-hydroxyquinoline and guanidine, see: Smith et al. (2006a,b). For a recently reported proton-transfer compound of acridine and benzene-1,3,5-tricarboxylic acid, see: Derikvand et al. (2009). For graph-set analysis, see: Bernstein et al. (1995).
Experimental
Crystal data
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Data collection
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Refinement
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Data collection: X-AREA (Stoe & Cie, 2006); cell X-AREA; data reduction: X-RED32 (Stoe & Cie, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536810030588/om2349sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810030588/om2349Isup2.hkl
The reaction between a solution of pyrazine-2,3-dicarboxylic acid (160 mg, 1 mmol) in 20 ml water and acridine (180 mg, 1 mmol) in 10 ml methanol, in a 1:1 molar ratio, gave brown rod-like crystals after slow evaporation of the solvent at room temperature.
The OH and NH H-atoms were located in a difference electron-density map and were freely refined: O—H = 0.948 (7) Å, N—H = 0.944 (16) Å. The C-bound H-atoms were included in calculated positions and treated as riding atoms: C—H = 0.94 Å with Uiso(H) = 1.2Ueq(parent C-atom).
Acridine is structurally related to anthracene wherein one of the central CH groups is replaced by nitrogen. Acridines are found to have a wide range of biological activity, such as mutagenic, antitumor (Talacki et al., 1974) and antibacterial (Achenson, 1956) properties.The ability of acridine to interact with DNA is also established (Fan et al., 1997). In addition, acridine compounds are considered to be efficient drugs for the treatment of Alzheimer's disease (Bandoli et al., 1994). Pyrazine-2,3-dicarboxylic acid, pz-2,3-dcH2, has proved to be well suited for the construction of the multi-dimensional frameworks due to the presence of two adjacent carboxylic acid groups.
There have been several attempts to prepare proton transfer compounds involving
and For example, ion pairs have been reported between pz-2,3-dcH2 and various organic bases such as 8-hydroxy quinoline (Smith et al., 2006a) and guanidine (Smith et al., 2006b). The of a proton-transfer compound of acridine and benzene-1,3,5-tricarboxylic acid has been reported (Derikvand et al., 2009). In this work, we report a new proton transfer compound obtained from pyrazine-2,3-dicarboxylic acid as a proton donor and acridine as an acceptor.The molecular structure of the title compound (Fig. 1), confirmed the full proton transfer, i.e. protonation of the acridine N atom and deprotonation of one of the carboxylic acid groups in the pyrazine-2,3-dicarboxylic acid. The carboxylate groups of the anion are twisted by 46.09 (7) and 37.34 (7)° with respect to the aromatic ring of pyrazine.
Non-covalent interactions cause the structure to form a self-assembled system. A hydrogen bonded motif is found involving the anion and cation fragments. The (pz-2,3-dcH)- units are linked to each other by O–H···O hydrogen bonds to form one-dimensional chains with a C(10) graph-set motif (Bernstein et al., 1995). In contrast, the N–H···O and C–H···O hydrogen bonds link the (acrH)+ cations to these chains (Fig. 2, Table 1). In addition, interactions consisting of π–π stacking with centroid-to-centroid distances of 3.6315 (8) to 3.7202 (9) Å between two acridine parallel rings are also present. Furthermore, C–H···π edge-to-face interactions are present involving the CH group of acridine with an aromatic ring of (pz-2,3-dcH)-, with a H···π distance of 2.95 Å for C18–H18···Cg1i [symmetry code: (i) 1 - x, 1/2 + y, 1/2 - z; Cg1= centroid of ring N1,N2,C1–C3; Fig. 3)]. The sum of these weak non-covalent interactions seems to play an important role in the crystal packing. The packing diagram of the title compound, showing the N—H···O and O—H···O hydrogen bonding, is shown in Fig. 4 and details are given in Table 1.
For the biological activity of acridines, see: Talacki et al. (1974); Achenson (1956); Fan et al. (1997); Bandoli et al. (1994). For ion pairs reported from pyrazine-2,3-dicarboxylic acid, pz-2,3-dcH2, with various organic bases such as 8-hydroxyquinoline and guanidine, see: Smith et al. (2006a,b). For a recently reported proton-transfer compound of acridine and benzene-1,3,5-tricarboxylic acid, see: Derikvand et al. (2009). For graph-set analysis, see: Bernstein et al. (1995).
Data collection: X-AREA (Stoe & Cie, 2006); cell
X-AREA (Stoe & Cie, 2006); data reduction: X-RED32 (Stoe & Cie, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C13H10N+·C6H3N2O4− | F(000) = 1440 |
Mr = 347.32 | Dx = 1.500 Mg m−3 |
Orthorhombic, Pbca | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ac 2ab | Cell parameters from 6855 reflections |
a = 10.0597 (9) Å | θ = 1.7–29.6° |
b = 15.0623 (12) Å | µ = 0.11 mm−1 |
c = 20.306 (2) Å | T = 223 K |
V = 3076.8 (5) Å3 | Rod, brown |
Z = 8 | 0.45 × 0.36 × 0.25 mm |
Stoe IPDS 2 diffractometer | 2639 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.037 |
Graphite monochromator | θmax = 29.2°, θmin = 2.6° |
Detector resolution: 6.67 pixels mm-1 | h = −13→8 |
φ and ω scans | k = −20→19 |
11459 measured reflections | l = −27→19 |
4070 independent reflections |
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)] = 0.036 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.080 | w = 1/[σ2(Fo2) + (0.0423P)2] where P = (Fo2 + 2Fc2)/3 |
S = 0.88 | (Δ/σ)max = 0.001 |
4070 reflections | Δρmax = 0.26 e Å−3 |
244 parameters | Δρmin = −0.15 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: 0.0053 (5) |
C13H10N+·C6H3N2O4− | V = 3076.8 (5) Å3 |
Mr = 347.32 | Z = 8 |
Orthorhombic, Pbca | Mo Kα radiation |
a = 10.0597 (9) Å | µ = 0.11 mm−1 |
b = 15.0623 (12) Å | T = 223 K |
c = 20.306 (2) Å | 0.45 × 0.36 × 0.25 mm |
Stoe IPDS 2 diffractometer | 2639 reflections with I > 2σ(I) |
11459 measured reflections | Rint = 0.037 |
4070 independent reflections |
R[F2 > 2σ(F2)] = 0.036 | 0 restraints |
wR(F2) = 0.080 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.88 | Δρmax = 0.26 e Å−3 |
4070 reflections | Δρmin = −0.15 e Å−3 |
244 parameters |
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 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 | ||
N3 | 0.39070 (12) | 0.36166 (6) | 0.33546 (5) | 0.0262 (3) | |
C7 | 0.30038 (14) | 0.30865 (7) | 0.30586 (6) | 0.0258 (3) | |
C8 | 0.20976 (15) | 0.25926 (7) | 0.34397 (6) | 0.0307 (4) | |
C9 | 0.11849 (16) | 0.20748 (8) | 0.31306 (7) | 0.0337 (4) | |
C10 | 0.11455 (15) | 0.20109 (7) | 0.24330 (7) | 0.0330 (4) | |
C11 | 0.20060 (14) | 0.24823 (8) | 0.20582 (7) | 0.0315 (4) | |
C12 | 0.29589 (14) | 0.30485 (7) | 0.23570 (6) | 0.0268 (3) | |
C13 | 0.38426 (15) | 0.35715 (7) | 0.20033 (6) | 0.0291 (4) | |
C14 | 0.47339 (14) | 0.41345 (7) | 0.23175 (6) | 0.0273 (3) | |
C15 | 0.56395 (15) | 0.46933 (8) | 0.19741 (7) | 0.0334 (4) | |
C16 | 0.64831 (16) | 0.52222 (8) | 0.23146 (7) | 0.0375 (4) | |
C17 | 0.64816 (16) | 0.52281 (8) | 0.30109 (7) | 0.0377 (4) | |
C18 | 0.56445 (15) | 0.47022 (8) | 0.33632 (7) | 0.0326 (4) | |
C19 | 0.47527 (14) | 0.41474 (7) | 0.30188 (6) | 0.0266 (3) | |
O1 | 0.09781 (10) | 0.19372 (5) | 0.01540 (5) | 0.0310 (3) | |
O2 | 0.02145 (11) | 0.12332 (6) | 0.10467 (5) | 0.0394 (3) | |
O3 | 0.43276 (10) | 0.18006 (5) | −0.04013 (4) | 0.0292 (3) | |
O4 | 0.37854 (10) | 0.18308 (5) | 0.06640 (4) | 0.0321 (3) | |
N1 | 0.12751 (12) | −0.03103 (6) | 0.04271 (5) | 0.0297 (3) | |
N2 | 0.35933 (12) | −0.00112 (6) | −0.02910 (5) | 0.0294 (3) | |
C1 | 0.17714 (13) | 0.05048 (7) | 0.03435 (6) | 0.0233 (3) | |
C2 | 0.19595 (15) | −0.09731 (7) | 0.01534 (7) | 0.0320 (4) | |
C3 | 0.30534 (15) | −0.08191 (7) | −0.02325 (7) | 0.0323 (4) | |
C4 | 0.29838 (13) | 0.06421 (7) | 0.00344 (5) | 0.0224 (3) | |
C5 | 0.09064 (13) | 0.12624 (7) | 0.05662 (6) | 0.0248 (3) | |
C6 | 0.37460 (13) | 0.15038 (7) | 0.01113 (6) | 0.0229 (3) | |
H3N | 0.4009 (17) | 0.3551 (9) | 0.3814 (8) | 0.040 (4)* | |
H8 | 0.21240 | 0.26210 | 0.39020 | 0.0370* | |
H9 | 0.05680 | 0.17530 | 0.33830 | 0.0400* | |
H10 | 0.05170 | 0.16390 | 0.22300 | 0.0400* | |
H11 | 0.19720 | 0.24340 | 0.15970 | 0.0380* | |
H13 | 0.38380 | 0.35440 | 0.15410 | 0.0350* | |
H15 | 0.56520 | 0.46950 | 0.15110 | 0.0400* | |
H16 | 0.70780 | 0.55910 | 0.20850 | 0.0450* | |
H17 | 0.70730 | 0.56050 | 0.32350 | 0.0450* | |
H18 | 0.56590 | 0.47080 | 0.38260 | 0.0390* | |
H1 | 0.0346 (19) | 0.2380 (10) | 0.0263 (8) | 0.051 (5)* | |
H2 | 0.16840 | −0.15610 | 0.02270 | 0.0380* | |
H3 | 0.34360 | −0.12960 | −0.04630 | 0.0390* |
U11 | U22 | U33 | U12 | U13 | U23 | |
N3 | 0.0286 (6) | 0.0282 (5) | 0.0218 (5) | 0.0012 (4) | −0.0019 (5) | 0.0008 (4) |
C7 | 0.0276 (7) | 0.0236 (5) | 0.0262 (6) | 0.0030 (5) | −0.0019 (6) | 0.0002 (4) |
C8 | 0.0344 (8) | 0.0307 (6) | 0.0270 (6) | −0.0001 (5) | 0.0011 (6) | 0.0019 (5) |
C9 | 0.0338 (8) | 0.0288 (6) | 0.0385 (7) | −0.0013 (6) | 0.0026 (6) | 0.0029 (5) |
C10 | 0.0312 (8) | 0.0274 (5) | 0.0403 (7) | −0.0006 (5) | −0.0052 (7) | −0.0038 (5) |
C11 | 0.0347 (8) | 0.0306 (6) | 0.0293 (6) | 0.0043 (6) | −0.0046 (6) | −0.0047 (5) |
C12 | 0.0290 (7) | 0.0264 (5) | 0.0249 (6) | 0.0051 (5) | −0.0016 (6) | −0.0004 (4) |
C13 | 0.0327 (8) | 0.0316 (6) | 0.0230 (6) | 0.0053 (5) | −0.0010 (6) | 0.0023 (5) |
C14 | 0.0286 (7) | 0.0263 (5) | 0.0271 (6) | 0.0055 (5) | −0.0014 (6) | 0.0035 (5) |
C15 | 0.0383 (9) | 0.0304 (6) | 0.0316 (7) | 0.0037 (6) | 0.0023 (6) | 0.0087 (5) |
C16 | 0.0364 (9) | 0.0298 (6) | 0.0464 (8) | −0.0021 (6) | 0.0033 (7) | 0.0089 (6) |
C17 | 0.0366 (9) | 0.0289 (6) | 0.0475 (8) | −0.0035 (6) | −0.0036 (7) | −0.0011 (5) |
C18 | 0.0356 (8) | 0.0302 (6) | 0.0320 (7) | 0.0001 (6) | −0.0038 (6) | −0.0021 (5) |
C19 | 0.0273 (7) | 0.0237 (5) | 0.0288 (6) | 0.0036 (5) | −0.0008 (6) | 0.0016 (5) |
O1 | 0.0317 (6) | 0.0247 (4) | 0.0365 (5) | 0.0077 (4) | 0.0062 (4) | 0.0064 (3) |
O2 | 0.0492 (7) | 0.0356 (4) | 0.0333 (5) | 0.0027 (5) | 0.0135 (5) | 0.0015 (4) |
O3 | 0.0357 (6) | 0.0276 (4) | 0.0244 (4) | −0.0102 (4) | 0.0000 (4) | 0.0008 (3) |
O4 | 0.0382 (6) | 0.0310 (4) | 0.0271 (4) | −0.0074 (4) | −0.0005 (4) | −0.0061 (3) |
N1 | 0.0293 (6) | 0.0233 (5) | 0.0364 (6) | −0.0043 (4) | −0.0031 (5) | 0.0027 (4) |
N2 | 0.0288 (6) | 0.0261 (5) | 0.0334 (6) | −0.0002 (4) | −0.0018 (5) | −0.0049 (4) |
C1 | 0.0251 (7) | 0.0219 (5) | 0.0229 (6) | −0.0011 (5) | −0.0039 (5) | 0.0016 (4) |
C2 | 0.0325 (8) | 0.0192 (5) | 0.0442 (7) | −0.0035 (5) | −0.0090 (7) | 0.0000 (5) |
C3 | 0.0328 (8) | 0.0233 (5) | 0.0407 (8) | 0.0024 (5) | −0.0059 (6) | −0.0080 (5) |
C4 | 0.0253 (7) | 0.0210 (5) | 0.0209 (5) | 0.0002 (4) | −0.0042 (5) | 0.0009 (4) |
C5 | 0.0248 (7) | 0.0237 (5) | 0.0259 (6) | −0.0029 (5) | −0.0020 (5) | 0.0003 (4) |
C6 | 0.0207 (7) | 0.0216 (5) | 0.0263 (6) | 0.0006 (4) | −0.0026 (5) | 0.0005 (4) |
O1—C5 | 1.3187 (14) | C14—C15 | 1.4229 (19) |
O2—C5 | 1.1993 (16) | C15—C16 | 1.354 (2) |
O3—C6 | 1.2750 (15) | C16—C17 | 1.414 (2) |
O4—C6 | 1.2263 (14) | C17—C18 | 1.360 (2) |
O1—H1 | 0.948 (17) | C18—C19 | 1.4115 (19) |
N3—C7 | 1.3507 (17) | C8—H8 | 0.9400 |
N3—C19 | 1.3520 (16) | C9—H9 | 0.9400 |
N3—H3N | 0.944 (16) | C10—H10 | 0.9400 |
N1—C2 | 1.3340 (16) | C11—H11 | 0.9400 |
N1—C1 | 1.3362 (15) | C13—H13 | 0.9400 |
N2—C4 | 1.3345 (15) | C15—H15 | 0.9400 |
N2—C3 | 1.3379 (15) | C16—H16 | 0.9400 |
C7—C8 | 1.4083 (18) | C17—H17 | 0.9400 |
C7—C12 | 1.4265 (17) | C18—H18 | 0.9400 |
C8—C9 | 1.358 (2) | C1—C4 | 1.3872 (18) |
C9—C10 | 1.420 (2) | C1—C5 | 1.5046 (16) |
C10—C11 | 1.3538 (19) | C2—C3 | 1.371 (2) |
C11—C12 | 1.4193 (18) | C4—C6 | 1.5156 (16) |
C12—C13 | 1.3881 (18) | C2—H2 | 0.9400 |
C13—C14 | 1.3893 (18) | C3—H3 | 0.9400 |
C14—C19 | 1.4243 (17) | ||
C5—O1—H1 | 111.0 (10) | C11—C10—H10 | 120.00 |
C7—N3—C19 | 123.26 (11) | C12—C11—H11 | 120.00 |
C19—N3—H3N | 119.5 (10) | C10—C11—H11 | 120.00 |
C7—N3—H3N | 116.8 (9) | C12—C13—H13 | 119.00 |
C1—N1—C2 | 116.22 (11) | C14—C13—H13 | 119.00 |
C3—N2—C4 | 116.12 (11) | C14—C15—H15 | 120.00 |
N3—C7—C12 | 119.30 (11) | C16—C15—H15 | 120.00 |
C8—C7—C12 | 120.47 (11) | C17—C16—H16 | 120.00 |
N3—C7—C8 | 120.21 (11) | C15—C16—H16 | 120.00 |
C7—C8—C9 | 119.14 (12) | C16—C17—H17 | 119.00 |
C8—C9—C10 | 121.24 (13) | C18—C17—H17 | 119.00 |
C9—C10—C11 | 120.48 (13) | C17—C18—H18 | 121.00 |
C10—C11—C12 | 120.44 (13) | C19—C18—H18 | 121.00 |
C11—C12—C13 | 123.53 (12) | N1—C1—C5 | 116.27 (11) |
C7—C12—C13 | 118.28 (11) | C4—C1—C5 | 122.10 (10) |
C7—C12—C11 | 118.19 (12) | N1—C1—C4 | 121.53 (11) |
C12—C13—C14 | 121.48 (11) | N1—C2—C3 | 121.73 (10) |
C13—C14—C19 | 118.43 (11) | N2—C3—C2 | 122.05 (11) |
C15—C14—C19 | 118.26 (11) | N2—C4—C1 | 121.20 (10) |
C13—C14—C15 | 123.31 (12) | N2—C4—C6 | 116.75 (11) |
C14—C15—C16 | 119.94 (13) | C1—C4—C6 | 121.73 (10) |
C15—C16—C17 | 120.91 (13) | O1—C5—C1 | 111.23 (10) |
C16—C17—C18 | 121.55 (13) | O2—C5—C1 | 123.53 (10) |
C17—C18—C19 | 118.55 (13) | O1—C5—O2 | 125.20 (11) |
N3—C19—C18 | 120.01 (11) | O3—C6—C4 | 116.64 (10) |
N3—C19—C14 | 119.20 (11) | O4—C6—C4 | 117.04 (10) |
C14—C19—C18 | 120.79 (12) | O3—C6—O4 | 126.26 (11) |
C7—C8—H8 | 120.00 | N1—C2—H2 | 119.00 |
C9—C8—H8 | 120.00 | C3—C2—H2 | 119.00 |
C8—C9—H9 | 119.00 | N2—C3—H3 | 119.00 |
C10—C9—H9 | 119.00 | C2—C3—H3 | 119.00 |
C9—C10—H10 | 120.00 | ||
C19—N3—C7—C8 | −176.00 (12) | C13—C14—C19—N3 | −0.13 (18) |
C19—N3—C7—C12 | 2.58 (18) | C13—C14—C19—C18 | 179.56 (12) |
C7—N3—C19—C14 | −2.11 (18) | C13—C14—C15—C16 | −179.74 (13) |
C7—N3—C19—C18 | 178.21 (12) | C19—C14—C15—C16 | −0.39 (19) |
C1—N1—C2—C3 | −4.7 (2) | C15—C14—C19—N3 | −179.52 (11) |
C2—N1—C1—C4 | −4.93 (18) | C15—C14—C19—C18 | 0.17 (18) |
C2—N1—C1—C5 | 171.56 (11) | C14—C15—C16—C17 | 0.1 (2) |
C3—N2—C4—C6 | 165.73 (11) | C15—C16—C17—C18 | 0.4 (2) |
C3—N2—C4—C1 | −7.87 (17) | C16—C17—C18—C19 | −0.6 (2) |
C4—N2—C3—C2 | −1.7 (2) | C17—C18—C19—C14 | 0.33 (19) |
N3—C7—C12—C11 | 179.63 (11) | C17—C18—C19—N3 | −179.97 (13) |
N3—C7—C12—C13 | −0.81 (18) | N1—C1—C4—N2 | 11.70 (18) |
C12—C7—C8—C9 | 0.41 (19) | N1—C1—C4—C6 | −161.58 (11) |
N3—C7—C8—C9 | 178.98 (12) | C5—C1—C4—N2 | −164.58 (11) |
C8—C7—C12—C11 | −1.79 (18) | C5—C1—C4—C6 | 22.15 (17) |
C8—C7—C12—C13 | 177.77 (12) | N1—C1—C5—O1 | −140.94 (11) |
C7—C8—C9—C10 | 1.2 (2) | N1—C1—C5—O2 | 36.83 (18) |
C8—C9—C10—C11 | −1.4 (2) | C4—C1—C5—O1 | 35.52 (16) |
C9—C10—C11—C12 | −0.1 (2) | C4—C1—C5—O2 | −146.71 (13) |
C10—C11—C12—C13 | −177.91 (12) | N1—C2—C3—N2 | 8.4 (2) |
C10—C11—C12—C7 | 1.62 (19) | N2—C4—C6—O3 | 45.62 (15) |
C11—C12—C13—C14 | 178.19 (12) | N2—C4—C6—O4 | −131.77 (12) |
C7—C12—C13—C14 | −1.35 (19) | C1—C4—C6—O3 | −140.82 (12) |
C12—C13—C14—C15 | −178.83 (12) | C1—C4—C6—O4 | 41.78 (17) |
C12—C13—C14—C19 | 1.81 (19) |
Cg1 is the centroid of the N1,N2,C1–C4 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O3i | 0.948 (17) | 1.628 (17) | 2.5736 (13) | 174.7 (16) |
N3—H3N···O3ii | 0.944 (16) | 1.709 (16) | 2.6374 (13) | 167.0 (13) |
C10—H10···O2 | 0.94 | 2.50 | 3.1896 (17) | 131 |
C18—H18···Cg1iii | 0.94 | 2.95 | 3.7213 (16) | 140 |
Symmetry codes: (i) x−1/2, −y+1/2, −z; (ii) x, −y+1/2, z+1/2; (iii) −x+1, y+1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C13H10N+·C6H3N2O4− |
Mr | 347.32 |
Crystal system, space group | Orthorhombic, Pbca |
Temperature (K) | 223 |
a, b, c (Å) | 10.0597 (9), 15.0623 (12), 20.306 (2) |
V (Å3) | 3076.8 (5) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.11 |
Crystal size (mm) | 0.45 × 0.36 × 0.25 |
Data collection | |
Diffractometer | Stoe IPDS 2 |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 11459, 4070, 2639 |
Rint | 0.037 |
(sin θ/λ)max (Å−1) | 0.687 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.036, 0.080, 0.88 |
No. of reflections | 4070 |
No. of parameters | 244 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.26, −0.15 |
Computer programs: X-AREA (Stoe & Cie, 2006), X-RED32 (Stoe & Cie, 2006), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009).
Cg1 is the centroid of the N1,N2,C1–C4 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O3i | 0.948 (17) | 1.628 (17) | 2.5736 (13) | 174.7 (16) |
N3—H3N···O3ii | 0.944 (16) | 1.709 (16) | 2.6374 (13) | 167.0 (13) |
C10—H10···O2 | 0.94 | 2.50 | 3.1896 (17) | 131 |
C18—H18···Cg1iii | 0.94 | 2.95 | 3.7213 (16) | 140 |
Symmetry codes: (i) x−1/2, −y+1/2, −z; (ii) x, −y+1/2, z+1/2; (iii) −x+1, y+1/2, −z+1/2. |
Acknowledgements
HSE thanks the staff of the X-ray Application LAB, CSEM, Neuch\^atel for access to the X-ray diffraction equipment.
References
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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.
Acridine is structurally related to anthracene wherein one of the central CH groups is replaced by nitrogen. Acridines are found to have a wide range of biological activity, such as mutagenic, antitumor (Talacki et al., 1974) and antibacterial (Achenson, 1956) properties.The ability of acridine to interact with DNA is also established (Fan et al., 1997). In addition, acridine compounds are considered to be efficient drugs for the treatment of Alzheimer's disease (Bandoli et al., 1994). Pyrazine-2,3-dicarboxylic acid, pz-2,3-dcH2, has proved to be well suited for the construction of the multi-dimensional frameworks due to the presence of two adjacent carboxylic acid groups.
There have been several attempts to prepare proton transfer compounds involving carboxylic acids and amines. For example, ion pairs have been reported between pz-2,3-dcH2 and various organic bases such as 8-hydroxy quinoline (Smith et al., 2006a) and guanidine (Smith et al., 2006b). The crystal structure of a proton-transfer compound of acridine and benzene-1,3,5-tricarboxylic acid has been reported (Derikvand et al., 2009). In this work, we report a new proton transfer compound obtained from pyrazine-2,3-dicarboxylic acid as a proton donor and acridine as an acceptor.
The molecular structure of the title compound (Fig. 1), confirmed the full proton transfer, i.e. protonation of the acridine N atom and deprotonation of one of the carboxylic acid groups in the pyrazine-2,3-dicarboxylic acid. The carboxylate groups of the anion are twisted by 46.09 (7) and 37.34 (7)° with respect to the aromatic ring of pyrazine.
Non-covalent interactions cause the structure to form a self-assembled system. A hydrogen bonded motif is found involving the anion and cation fragments. The (pz-2,3-dcH)- units are linked to each other by O–H···O hydrogen bonds to form one-dimensional chains with a C(10) graph-set motif (Bernstein et al., 1995). In contrast, the N–H···O and C–H···O hydrogen bonds link the (acrH)+ cations to these chains (Fig. 2, Table 1). In addition, interactions consisting of π–π stacking with centroid-to-centroid distances of 3.6315 (8) to 3.7202 (9) Å between two acridine parallel rings are also present. Furthermore, C–H···π edge-to-face interactions are present involving the CH group of acridine with an aromatic ring of (pz-2,3-dcH)-, with a H···π distance of 2.95 Å for C18–H18···Cg1i [symmetry code: (i) 1 - x, 1/2 + y, 1/2 - z; Cg1= centroid of ring N1,N2,C1–C3; Fig. 3)]. The sum of these weak non-covalent interactions seems to play an important role in the crystal packing. The unit cell packing diagram of the title compound, showing the N—H···O and O—H···O hydrogen bonding, is shown in Fig. 4 and details are given in Table 1.