organic compounds
2,4-Diamino-5-(4-chlorophenyl)-6-ethylpyrimidin-1-ium 2-propanamidobenzoate
aDepartment of Advanced Technology Fusion, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143 701, Republic of Korea
*Correspondence e-mail: sampath@konkuk.ac.kr, sams76@gmail.com
In the title salt, C12H14ClN4+·C10H10NO3−, zwitterionic N—H⋯O interactions form an R22(8) ring. The is stabilized by N—H⋯O and N—H⋯N hydrogen bonds involving two different eight-membered rings. An N—H⋯O interaction occurs between the pyrimidine ring (donor) and carboxylate group (acceptor) while the other ring is formed by N—H⋯N interactions, which form a dimer between two symmetry-related salts. An intramolecular N—H⋯O hydrogen bond forms a six-membered ring in the benzoate. Intermolecular C—H⋯O interactions are also observed.
Related literature
For aminopyrimidine carboxylates, see: Chinnakali et al. (1999); Lynch & Jones (2004); Stanley et al. (2005). For aminopyrimidine and benzoic acid adducts, see: Balasubramani et al. (2005, 2006); Thanigaimani et al. (2006, 2007). For hydrogen bonding in molecular recognition and crystal engineering, see: Desiraju (1989). For puckering and asymmetry parameters, see: Cremer & Pople, (1975); Nardelli (1995).
Experimental
Crystal data
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Data collection
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Refinement
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Data collection: APEX2 (Bruker, 2004); cell SAINT (Bruker, 2004); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536811035501/ff2025sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811035501/ff2025Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811035501/ff2025Isup3.cml
A hot methanolic solution (20 ml) of 2,4-diamino-5-(4-chlorophenyl)-6- ethylpyrimidine and 2-(propanoylamino)benzoic acid in the ratio of 1:1 was warmed for 0.5 h over a water bath. The mixture was cooled slowly and kept at room temperature and after a few days, colourless crystals were obtained
H atoms were positioned geometrically and refined using a riding model with C—H = 0.93 Å for aromatic H, 0.97 Å for methylene, 0.96 Å for methyl H atoms and for aromatic NH2 and N—H = 0.86 Å. The Uiso parameters for H atoms were constrained to be 1.5Ueq of the
for the methyl H atoms and 1.2Ueq of the for the remaining H atoms.Aminopyrimidine-Carboxylate interactions are important since they are involved in protein-nucleic acids recognition and protein-drug binding. Hydrogen bonding plays a key role in molecular recognition and crystal engineering research (Desiraju, 1989). In general, aminopyrimidines posses self complementary hydrogen-bonded motifs forming a base pair which itself is a unique property. The adducts of carboxylic acid with 2-aminopyrimidine system form a graph-set motif R22(8) (Lynch & Jones, 2004). This motif is very robust in aminopyrimidine-carboxylic acid/carboxylates systems. The crystal structures of many aminopyrimidine carboxylates (Stanley et al., 2005) and
structures (Chinnakali et al.,1999) have been reported. Many structures of aminopyrimidine and benzoic acid adducts are also have been reported. Few of them are 2-amino-4,6-dimethoxy pyrimidine: 4-aminobenzoic acid (Thanigaimani et al., 2006), 2-amino-4,6-dimethoxypyrimidine: phthalic acid (Thanigaimani et al., 2007), 2-amino-4,6-dimethylpyrimidine: cinnamic acid (Balasubramani et al., 2005) and 2-amino-4,6-dimethylpyrimidine: 4-hydroxybenzoic acid (Balasubramani et al., 2006). All these reported structures have common features of heterosynthone formation. In the present study we report a salt (1:1) namely, 2,4-diamino-5-(4-chlorophenyl)-6-ethylpyrimidin-1-ium 2-propanamidobenzoate which forms a zwitterionic interaction between the molecules of aminopyrimidine and benzoate exhibit a motif R22(8) ring.The
of crystal contains a single molecule of each component of salt (Fig. 1). Interactions are found between the salt of aminopyrimidin-1-ium and benzoate via hydrogen bonds N2—H2B···O2 and N3—H3···O1 (Fig. 2). Here the pyrimidine acts as a donor which donates two H atoms to carboxylate O atoms (acceptor). In addition, a dimeric interaction through centre of inverted symmetry related salts via a hydrogen bond N4—H4A···N1 (Fig. 2) forms an eight membered ring. The dihedral angle between the rings, 4-chlorophenyl and 2,4-diaminopyrimidine is 63.8 (1)°. This value is higher than that in a biphenyl ring system. This may be due to the substitution of ethyl and amine groups at C4 and C6, respectively. An extended moiety of propanamido group is slightly deviating from the plane of benzoate moiety and the dihedral angle between these two is 10.8 (1)° (Cremer & Pople, 1975; Nardelli, 1995).The packing diagram of the molecule viewed down b-axis is shown in Fig. 3. Two symmetry related molecules of salt form the dimer and organize as a sheet. This sheet like dimers are connected through the hydrogen bonds N4—H4B···O3 & N2—H2A···O3 interactions. In addition, a six membered ring is formed by an intra-molecular interaction (N5—H5···O2)in benzoate molecule which also controls the molecules in crystal packing. Molecular packing is stabilized by many N—H···O and N—H···N types intra and intermolecular interactions (Table 1, Fig. 2).
For aminopyrimidine carboxylates, see: Chinnakali et al. (1999); Lynch & Jones (2004); Stanley et al. (2005). For aminopyrimidine and benzoic acid adducts, see: Balasubramani et al. (2005, 2006); Thanigaimani et al. (2006, 2007). For hydrogen bonding in molecular recognition and crystal engineering, see: Desiraju (1989). For puckering and asymmetry parameters, see: Cremer & Pople, (1975); Nardelli (1995).
Data collection: APEX2 (Bruker, 2004); cell
SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: PLATON (Spek, 2009).Fig. 1. ORTEP diagram of the title molecule with the atom numbering scheme. Displacement ellipsoid are drawn at 30% probability level. | |
Fig. 2. Dimer interaction between the symmetry related salts of title compound. Dashed lines indicate the intra and intermolecular hydrogen bonds. | |
Fig. 3. Packing diagram of the title compound viewed down the b-axis. Dashed lines indicate the intra and intermolecular interactions between the molecules. |
C12H14ClN4+·C10H10NO3− | F(000) = 1856 |
Mr = 441.91 | Dx = 1.295 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
a = 22.144 (3) Å | Cell parameters from 17933 reflections |
b = 9.4915 (14) Å | θ = 1.9–28.0° |
c = 21.844 (3) Å | µ = 0.20 mm−1 |
β = 99.071 (3)° | T = 293 K |
V = 4533.7 (12) Å3 | Block, colorless |
Z = 8 | 0.50 × 0.45 × 0.42 mm |
Bruker SMART APEX CCD area-detector diffractometer | 2719 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.039 |
Graphite monochromator | θmax = 28.0°, θmin = 1.9° |
ω scans | h = −28→29 |
17933 measured reflections | k = −10→12 |
5077 independent reflections | l = −28→28 |
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)] = 0.088 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.228 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.1005P)2 + 1.940P] where P = (Fo2 + 2Fc2)/3 |
5077 reflections | (Δ/σ)max = 0.002 |
281 parameters | Δρmax = 0.29 e Å−3 |
0 restraints | Δρmin = −0.24 e Å−3 |
C12H14ClN4+·C10H10NO3− | V = 4533.7 (12) Å3 |
Mr = 441.91 | Z = 8 |
Monoclinic, C2/c | Mo Kα radiation |
a = 22.144 (3) Å | µ = 0.20 mm−1 |
b = 9.4915 (14) Å | T = 293 K |
c = 21.844 (3) Å | 0.50 × 0.45 × 0.42 mm |
β = 99.071 (3)° |
Bruker SMART APEX CCD area-detector diffractometer | 2719 reflections with I > 2σ(I) |
17933 measured reflections | Rint = 0.039 |
5077 independent reflections |
R[F2 > 2σ(F2)] = 0.088 | 0 restraints |
wR(F2) = 0.228 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.29 e Å−3 |
5077 reflections | Δρmin = −0.24 e Å−3 |
281 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 | ||
Cl1 | 0.62790 (7) | −0.12826 (18) | 0.25493 (7) | 0.1465 (7) | |
O1 | 0.25218 (12) | 0.3854 (3) | 0.05381 (12) | 0.0926 (9) | |
O2 | 0.25430 (14) | 0.2607 (4) | 0.13892 (13) | 0.1067 (11) | |
O3 | 0.37717 (11) | 0.3960 (3) | 0.33389 (11) | 0.0809 (7) | |
N1 | 0.43891 (11) | 0.3633 (3) | −0.01402 (11) | 0.0567 (7) | |
N2 | 0.34901 (13) | 0.3749 (3) | −0.08192 (12) | 0.0708 (8) | |
H2A | 0.3626 | 0.4469 | −0.0994 | 0.085* | |
H2B | 0.3130 | 0.3430 | −0.0953 | 0.085* | |
N3 | 0.36043 (12) | 0.2008 (3) | −0.00894 (12) | 0.0640 (7) | |
H3 | 0.3237 | 0.1738 | −0.0228 | 0.077* | |
N4 | 0.52835 (12) | 0.3481 (3) | 0.05255 (12) | 0.0654 (7) | |
H4A | 0.5399 | 0.4220 | 0.0348 | 0.078* | |
H4B | 0.5525 | 0.3093 | 0.0825 | 0.078* | |
N5 | 0.32811 (13) | 0.3417 (3) | 0.23743 (12) | 0.0763 (9) | |
H5 | 0.2990 | 0.2900 | 0.2188 | 0.092* | |
C2 | 0.38321 (14) | 0.3137 (3) | −0.03469 (14) | 0.0567 (8) | |
C4 | 0.39373 (15) | 0.1283 (4) | 0.03825 (14) | 0.0620 (9) | |
C5 | 0.45211 (14) | 0.1711 (3) | 0.06071 (13) | 0.0562 (8) | |
C6 | 0.47322 (14) | 0.2937 (3) | 0.03366 (13) | 0.0544 (8) | |
C7 | 0.49398 (15) | 0.0933 (4) | 0.10941 (14) | 0.0590 (8) | |
C8 | 0.51370 (18) | −0.0416 (4) | 0.09988 (16) | 0.0780 (10) | |
H8 | 0.4995 | −0.0873 | 0.0627 | 0.094* | |
C9 | 0.5542 (2) | −0.1100 (4) | 0.1447 (2) | 0.0925 (13) | |
H9 | 0.5666 | −0.2014 | 0.1378 | 0.111* | |
C10 | 0.57609 (18) | −0.0431 (5) | 0.19934 (18) | 0.0828 (11) | |
C11 | 0.55717 (17) | 0.0894 (5) | 0.21009 (16) | 0.0770 (11) | |
H11 | 0.5722 | 0.1341 | 0.2473 | 0.092* | |
C12 | 0.51563 (16) | 0.1586 (4) | 0.16609 (15) | 0.0676 (9) | |
H12 | 0.5021 | 0.2484 | 0.1742 | 0.081* | |
C13 | 0.36238 (19) | 0.0048 (4) | 0.06172 (18) | 0.0857 (12) | |
H13A | 0.3875 | −0.0302 | 0.0990 | 0.103* | |
H13B | 0.3238 | 0.0360 | 0.0729 | 0.103* | |
C14 | 0.3503 (3) | −0.1118 (5) | 0.0168 (3) | 0.1222 (18) | |
H14A | 0.3300 | −0.1870 | 0.0348 | 0.183* | |
H14B | 0.3883 | −0.1455 | 0.0064 | 0.183* | |
H14C | 0.3247 | −0.0788 | −0.0200 | 0.183* | |
C15 | 0.33329 (14) | 0.4293 (4) | 0.13458 (15) | 0.0596 (8) | |
C16 | 0.36330 (15) | 0.5078 (4) | 0.09550 (16) | 0.0663 (9) | |
H16 | 0.3467 | 0.5132 | 0.0537 | 0.080* | |
C17 | 0.41712 (16) | 0.5788 (4) | 0.11626 (18) | 0.0754 (10) | |
H17 | 0.4364 | 0.6313 | 0.0891 | 0.090* | |
C18 | 0.44141 (17) | 0.5700 (4) | 0.17795 (19) | 0.0833 (11) | |
H18 | 0.4777 | 0.6169 | 0.1927 | 0.100* | |
C19 | 0.41304 (16) | 0.4932 (4) | 0.21807 (18) | 0.0774 (10) | |
H19 | 0.4303 | 0.4888 | 0.2597 | 0.093* | |
C20 | 0.35892 (15) | 0.4216 (4) | 0.19784 (15) | 0.0620 (8) | |
C21 | 0.27569 (16) | 0.3551 (4) | 0.10749 (16) | 0.0687 (9) | |
C22 | 0.33649 (17) | 0.3327 (4) | 0.29967 (16) | 0.0758 (10) | |
C23 | 0.2921 (2) | 0.2325 (7) | 0.3252 (2) | 0.1161 (17) | |
H23A | 0.2583 | 0.2126 | 0.2924 | 0.139* | |
H23B | 0.3131 | 0.1442 | 0.3363 | 0.139* | |
C24 | 0.2684 (5) | 0.2828 (11) | 0.3771 (4) | 0.247 (6) | |
H24A | 0.2412 | 0.2139 | 0.3898 | 0.371* | |
H24B | 0.2465 | 0.3689 | 0.3665 | 0.371* | |
H24C | 0.3014 | 0.2999 | 0.4104 | 0.371* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.1356 (12) | 0.1739 (14) | 0.1179 (10) | 0.0501 (10) | −0.0176 (8) | 0.0603 (10) |
O1 | 0.0793 (17) | 0.122 (2) | 0.0646 (15) | −0.0330 (16) | −0.0247 (13) | 0.0108 (15) |
O2 | 0.097 (2) | 0.132 (3) | 0.0758 (17) | −0.0575 (19) | −0.0334 (15) | 0.0152 (17) |
O3 | 0.0685 (15) | 0.104 (2) | 0.0626 (14) | 0.0039 (14) | −0.0119 (12) | −0.0153 (14) |
N1 | 0.0503 (14) | 0.0625 (16) | 0.0522 (14) | −0.0062 (13) | −0.0077 (11) | 0.0027 (12) |
N2 | 0.0611 (16) | 0.0756 (19) | 0.0667 (17) | −0.0151 (15) | −0.0177 (14) | 0.0160 (15) |
N3 | 0.0519 (15) | 0.0730 (19) | 0.0613 (16) | −0.0176 (14) | −0.0093 (12) | 0.0036 (14) |
N4 | 0.0542 (15) | 0.0687 (18) | 0.0675 (17) | −0.0089 (14) | −0.0082 (13) | 0.0185 (14) |
N5 | 0.0629 (17) | 0.100 (2) | 0.0574 (17) | −0.0223 (17) | −0.0183 (14) | −0.0015 (16) |
C2 | 0.0562 (19) | 0.0574 (19) | 0.0522 (17) | −0.0120 (16) | −0.0045 (15) | −0.0012 (15) |
C4 | 0.062 (2) | 0.067 (2) | 0.0534 (18) | −0.0103 (17) | −0.0020 (15) | 0.0032 (16) |
C5 | 0.0576 (18) | 0.061 (2) | 0.0484 (16) | −0.0032 (16) | 0.0024 (14) | 0.0017 (14) |
C6 | 0.0513 (17) | 0.060 (2) | 0.0494 (17) | −0.0062 (16) | 0.0014 (14) | −0.0001 (14) |
C7 | 0.0579 (18) | 0.065 (2) | 0.0528 (18) | −0.0041 (16) | 0.0051 (15) | 0.0059 (15) |
C8 | 0.098 (3) | 0.072 (3) | 0.061 (2) | 0.006 (2) | 0.005 (2) | 0.0003 (18) |
C9 | 0.116 (4) | 0.078 (3) | 0.085 (3) | 0.033 (3) | 0.020 (3) | 0.019 (2) |
C10 | 0.075 (2) | 0.104 (3) | 0.068 (2) | 0.014 (2) | 0.005 (2) | 0.026 (2) |
C11 | 0.072 (2) | 0.099 (3) | 0.055 (2) | −0.005 (2) | −0.0049 (18) | 0.009 (2) |
C12 | 0.069 (2) | 0.073 (2) | 0.058 (2) | 0.0008 (18) | 0.0028 (17) | 0.0016 (17) |
C13 | 0.081 (3) | 0.089 (3) | 0.080 (2) | −0.021 (2) | −0.009 (2) | 0.016 (2) |
C14 | 0.132 (4) | 0.085 (3) | 0.139 (4) | −0.026 (3) | −0.013 (4) | 0.007 (3) |
C15 | 0.0490 (17) | 0.063 (2) | 0.0607 (19) | 0.0016 (16) | −0.0089 (15) | −0.0106 (16) |
C16 | 0.061 (2) | 0.076 (2) | 0.0568 (18) | −0.0003 (18) | −0.0051 (16) | −0.0004 (17) |
C17 | 0.055 (2) | 0.084 (3) | 0.084 (3) | −0.0058 (19) | 0.0027 (18) | 0.006 (2) |
C18 | 0.061 (2) | 0.090 (3) | 0.091 (3) | −0.017 (2) | −0.013 (2) | 0.002 (2) |
C19 | 0.065 (2) | 0.086 (3) | 0.071 (2) | −0.012 (2) | −0.0202 (18) | 0.000 (2) |
C20 | 0.0519 (18) | 0.066 (2) | 0.0625 (19) | −0.0002 (17) | −0.0091 (15) | −0.0040 (17) |
C21 | 0.062 (2) | 0.078 (2) | 0.060 (2) | −0.0134 (19) | −0.0081 (17) | −0.0059 (19) |
C22 | 0.065 (2) | 0.095 (3) | 0.061 (2) | 0.008 (2) | −0.0099 (18) | −0.005 (2) |
C23 | 0.100 (3) | 0.174 (5) | 0.073 (3) | −0.012 (3) | 0.009 (2) | 0.015 (3) |
C24 | 0.312 (13) | 0.252 (10) | 0.206 (9) | −0.147 (10) | 0.126 (9) | −0.044 (8) |
Cl1—C10 | 1.734 (4) | C10—C11 | 1.357 (6) |
O1—C21 | 1.240 (4) | C11—C12 | 1.387 (5) |
O2—C21 | 1.265 (4) | C11—H11 | 0.9300 |
O3—C22 | 1.232 (4) | C12—H12 | 0.9300 |
N1—C2 | 1.331 (4) | C13—C14 | 1.475 (6) |
N1—C6 | 1.360 (4) | C13—H13A | 0.9700 |
N2—C2 | 1.315 (4) | C13—H13B | 0.9700 |
N2—H2A | 0.8600 | C14—H14A | 0.9600 |
N2—H2B | 0.8600 | C14—H14B | 0.9600 |
N3—C2 | 1.345 (4) | C14—H14C | 0.9600 |
N3—C4 | 1.356 (4) | C15—C16 | 1.380 (5) |
N3—H3 | 0.8600 | C15—C20 | 1.410 (4) |
N4—C6 | 1.330 (4) | C15—C21 | 1.495 (5) |
N4—H4A | 0.8600 | C16—C17 | 1.382 (5) |
N4—H4B | 0.8600 | C16—H16 | 0.9300 |
N5—C22 | 1.346 (4) | C17—C18 | 1.372 (5) |
N5—C20 | 1.405 (4) | C17—H17 | 0.9300 |
N5—H5 | 0.8600 | C18—C19 | 1.366 (5) |
C4—C5 | 1.370 (4) | C18—H18 | 0.9300 |
C4—C13 | 1.494 (5) | C19—C20 | 1.388 (5) |
C5—C6 | 1.417 (4) | C19—H19 | 0.9300 |
C5—C7 | 1.492 (4) | C22—C23 | 1.534 (6) |
C7—C8 | 1.379 (5) | C23—C24 | 1.406 (9) |
C7—C12 | 1.400 (4) | C23—H23A | 0.9700 |
C8—C9 | 1.381 (5) | C23—H23B | 0.9700 |
C8—H8 | 0.9300 | C24—H24A | 0.9600 |
C9—C10 | 1.372 (6) | C24—H24B | 0.9600 |
C9—H9 | 0.9300 | C24—H24C | 0.9600 |
C2—N1—C6 | 117.6 (3) | C14—C13—H13B | 108.8 |
C2—N2—H2A | 120.0 | C4—C13—H13B | 108.8 |
C2—N2—H2B | 120.0 | H13A—C13—H13B | 107.7 |
H2A—N2—H2B | 120.0 | C13—C14—H14A | 109.5 |
C2—N3—C4 | 121.8 (3) | C13—C14—H14B | 109.5 |
C2—N3—H3 | 119.1 | H14A—C14—H14B | 109.5 |
C4—N3—H3 | 119.1 | C13—C14—H14C | 109.5 |
C6—N4—H4A | 120.0 | H14A—C14—H14C | 109.5 |
C6—N4—H4B | 120.0 | H14B—C14—H14C | 109.5 |
H4A—N4—H4B | 120.0 | C16—C15—C20 | 118.4 (3) |
C22—N5—C20 | 130.8 (3) | C16—C15—C21 | 118.3 (3) |
C22—N5—H5 | 114.6 | C20—C15—C21 | 123.4 (3) |
C20—N5—H5 | 114.6 | C15—C16—C17 | 122.3 (3) |
N2—C2—N1 | 119.9 (3) | C15—C16—H16 | 118.8 |
N2—C2—N3 | 118.2 (3) | C17—C16—H16 | 118.8 |
N1—C2—N3 | 121.9 (3) | C18—C17—C16 | 118.5 (4) |
N3—C4—C5 | 119.4 (3) | C18—C17—H17 | 120.8 |
N3—C4—C13 | 115.6 (3) | C16—C17—H17 | 120.8 |
C5—C4—C13 | 125.0 (3) | C19—C18—C17 | 120.9 (3) |
C4—C5—C6 | 116.6 (3) | C19—C18—H18 | 119.5 |
C4—C5—C7 | 123.6 (3) | C17—C18—H18 | 119.5 |
C6—C5—C7 | 119.7 (3) | C18—C19—C20 | 121.2 (3) |
N4—C6—N1 | 115.1 (3) | C18—C19—H19 | 119.4 |
N4—C6—C5 | 122.4 (3) | C20—C19—H19 | 119.4 |
N1—C6—C5 | 122.5 (3) | C19—C20—N5 | 123.1 (3) |
C8—C7—C12 | 118.2 (3) | C19—C20—C15 | 118.7 (3) |
C8—C7—C5 | 121.9 (3) | N5—C20—C15 | 118.1 (3) |
C12—C7—C5 | 119.9 (3) | O1—C21—O2 | 122.7 (3) |
C7—C8—C9 | 121.0 (4) | O1—C21—C15 | 118.0 (3) |
C7—C8—H8 | 119.5 | O2—C21—C15 | 119.2 (3) |
C9—C8—H8 | 119.5 | O3—C22—N5 | 123.6 (4) |
C10—C9—C8 | 120.0 (4) | O3—C22—C23 | 122.0 (3) |
C10—C9—H9 | 120.0 | N5—C22—C23 | 114.4 (3) |
C8—C9—H9 | 120.0 | C24—C23—C22 | 115.1 (6) |
C11—C10—C9 | 120.2 (4) | C24—C23—H23A | 108.5 |
C11—C10—Cl1 | 120.0 (3) | C22—C23—H23A | 108.5 |
C9—C10—Cl1 | 119.9 (4) | C24—C23—H23B | 108.5 |
C10—C11—C12 | 120.5 (4) | C22—C23—H23B | 108.5 |
C10—C11—H11 | 119.7 | H23A—C23—H23B | 107.5 |
C12—C11—H11 | 119.7 | C23—C24—H24A | 109.5 |
C11—C12—C7 | 120.0 (4) | C23—C24—H24B | 109.5 |
C11—C12—H12 | 120.0 | H24A—C24—H24B | 109.5 |
C7—C12—H12 | 120.0 | C23—C24—H24C | 109.5 |
C14—C13—C4 | 114.0 (4) | H24A—C24—H24C | 109.5 |
C14—C13—H13A | 108.8 | H24B—C24—H24C | 109.5 |
C4—C13—H13A | 108.8 | ||
C6—N1—C2—N2 | −178.0 (3) | C10—C11—C12—C7 | −1.6 (5) |
C6—N1—C2—N3 | 1.5 (5) | C8—C7—C12—C11 | 1.9 (5) |
C4—N3—C2—N2 | 177.3 (3) | C5—C7—C12—C11 | −176.4 (3) |
C4—N3—C2—N1 | −2.2 (5) | N3—C4—C13—C14 | 67.1 (5) |
C2—N3—C4—C5 | 0.3 (5) | C5—C4—C13—C14 | −112.8 (4) |
C2—N3—C4—C13 | −179.6 (3) | C20—C15—C16—C17 | −0.1 (5) |
N3—C4—C5—C6 | 2.0 (5) | C21—C15—C16—C17 | −179.3 (3) |
C13—C4—C5—C6 | −178.1 (3) | C15—C16—C17—C18 | 0.2 (6) |
N3—C4—C5—C7 | −175.7 (3) | C16—C17—C18—C19 | −0.2 (6) |
C13—C4—C5—C7 | 4.2 (5) | C17—C18—C19—C20 | 0.1 (6) |
C2—N1—C6—N4 | −179.8 (3) | C18—C19—C20—N5 | −179.8 (3) |
C2—N1—C6—C5 | 1.0 (4) | C18—C19—C20—C15 | 0.0 (6) |
C4—C5—C6—N4 | 178.1 (3) | C22—N5—C20—C19 | 10.9 (6) |
C7—C5—C6—N4 | −4.1 (5) | C22—N5—C20—C15 | −168.9 (4) |
C4—C5—C6—N1 | −2.7 (5) | C16—C15—C20—C19 | 0.0 (5) |
C7—C5—C6—N1 | 175.0 (3) | C21—C15—C20—C19 | 179.2 (3) |
C4—C5—C7—C8 | 63.2 (5) | C16—C15—C20—N5 | 179.9 (3) |
C6—C5—C7—C8 | −114.4 (4) | C21—C15—C20—N5 | −1.0 (5) |
C4—C5—C7—C12 | −118.5 (4) | C16—C15—C21—O1 | −11.5 (5) |
C6—C5—C7—C12 | 63.9 (4) | C20—C15—C21—O1 | 169.3 (3) |
C12—C7—C8—C9 | −0.7 (5) | C16—C15—C21—O2 | 165.7 (3) |
C5—C7—C8—C9 | 177.6 (3) | C20—C15—C21—O2 | −13.5 (5) |
C7—C8—C9—C10 | −0.9 (6) | C20—N5—C22—O3 | −2.3 (6) |
C8—C9—C10—C11 | 1.3 (6) | C20—N5—C22—C23 | 179.6 (4) |
C8—C9—C10—Cl1 | −178.9 (3) | O3—C22—C23—C24 | 44.3 (8) |
C9—C10—C11—C12 | −0.1 (6) | N5—C22—C23—C24 | −137.5 (7) |
Cl1—C10—C11—C12 | −179.8 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N5—H5···O2 | 0.86 | 1.89 | 2.605 (4) | 140 |
N2—H2A···O3i | 0.86 | 2.15 | 2.977 (4) | 163 |
N4—H4A···N1ii | 0.86 | 2.16 | 2.988 (4) | 163 |
N3—H3···O1iii | 0.86 | 1.80 | 2.660 (4) | 178 |
C14—H14C···O1iii | 0.96 | 2.53 | 3.323 (6) | 140 |
N2—H2B···O2iii | 0.86 | 1.91 | 2.746 (4) | 164 |
N4—H4B···O3iv | 0.86 | 2.35 | 3.017 (3) | 134 |
Symmetry codes: (i) x, −y+1, z−1/2; (ii) −x+1, −y+1, −z; (iii) −x+1/2, −y+1/2, −z; (iv) −x+1, y, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C12H14ClN4+·C10H10NO3− |
Mr | 441.91 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 293 |
a, b, c (Å) | 22.144 (3), 9.4915 (14), 21.844 (3) |
β (°) | 99.071 (3) |
V (Å3) | 4533.7 (12) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.20 |
Crystal size (mm) | 0.50 × 0.45 × 0.42 |
Data collection | |
Diffractometer | Bruker SMART APEX CCD area-detector |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 17933, 5077, 2719 |
Rint | 0.039 |
(sin θ/λ)max (Å−1) | 0.660 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.088, 0.228, 1.06 |
No. of reflections | 5077 |
No. of parameters | 281 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.29, −0.24 |
Computer programs: APEX2 (Bruker, 2004), SAINT (Bruker, 2004), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997), PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
N5—H5···O2 | 0.86 | 1.89 | 2.605 (4) | 140 |
N2—H2A···O3i | 0.86 | 2.15 | 2.977 (4) | 163 |
N4—H4A···N1ii | 0.86 | 2.16 | 2.988 (4) | 163 |
N3—H3···O1iii | 0.86 | 1.80 | 2.660 (4) | 178 |
C14—H14C···O1iii | 0.96 | 2.53 | 3.323 (6) | 140 |
N2—H2B···O2iii | 0.86 | 1.91 | 2.746 (4) | 164 |
N4—H4B···O3iv | 0.86 | 2.35 | 3.017 (3) | 134 |
Symmetry codes: (i) x, −y+1, z−1/2; (ii) −x+1, −y+1, −z; (iii) −x+1/2, −y+1/2, −z; (iv) −x+1, y, −z+1/2. |
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.
Aminopyrimidine-Carboxylate interactions are important since they are involved in protein-nucleic acids recognition and protein-drug binding. Hydrogen bonding plays a key role in molecular recognition and crystal engineering research (Desiraju, 1989). In general, aminopyrimidines posses self complementary hydrogen-bonded motifs forming a base pair which itself is a unique property. The adducts of carboxylic acid with 2-aminopyrimidine system form a graph-set motif R22(8) (Lynch & Jones, 2004). This motif is very robust in aminopyrimidine-carboxylic acid/carboxylates systems. The crystal structures of many aminopyrimidine carboxylates (Stanley et al., 2005) and co-crystal structures (Chinnakali et al.,1999) have been reported. Many structures of aminopyrimidine and benzoic acid adducts are also have been reported. Few of them are 2-amino-4,6-dimethoxy pyrimidine: 4-aminobenzoic acid (Thanigaimani et al., 2006), 2-amino-4,6-dimethoxypyrimidine: phthalic acid (Thanigaimani et al., 2007), 2-amino-4,6-dimethylpyrimidine: cinnamic acid (Balasubramani et al., 2005) and 2-amino-4,6-dimethylpyrimidine: 4-hydroxybenzoic acid (Balasubramani et al., 2006). All these reported structures have common features of heterosynthone formation. In the present study we report a salt (1:1) namely, 2,4-diamino-5-(4-chlorophenyl)-6-ethylpyrimidin-1-ium 2-propanamidobenzoate which forms a zwitterionic interaction between the molecules of aminopyrimidine and benzoate exhibit a motif R22(8) ring.
The asymmetric unit of crystal contains a single molecule of each component of salt (Fig. 1). Interactions are found between the salt of aminopyrimidin-1-ium and benzoate via hydrogen bonds N2—H2B···O2 and N3—H3···O1 (Fig. 2). Here the pyrimidine acts as a donor which donates two H atoms to carboxylate O atoms (acceptor). In addition, a dimeric interaction through centre of inverted symmetry related salts via a hydrogen bond N4—H4A···N1 (Fig. 2) forms an eight membered ring. The dihedral angle between the rings, 4-chlorophenyl and 2,4-diaminopyrimidine is 63.8 (1)°. This value is higher than that in a biphenyl ring system. This may be due to the substitution of ethyl and amine groups at C4 and C6, respectively. An extended moiety of propanamido group is slightly deviating from the plane of benzoate moiety and the dihedral angle between these two is 10.8 (1)° (Cremer & Pople, 1975; Nardelli, 1995).
The packing diagram of the molecule viewed down b-axis is shown in Fig. 3. Two symmetry related molecules of salt form the dimer and organize as a sheet. This sheet like dimers are connected through the hydrogen bonds N4—H4B···O3 & N2—H2A···O3 interactions. In addition, a six membered ring is formed by an intra-molecular interaction (N5—H5···O2)in benzoate molecule which also controls the molecules in crystal packing. Molecular packing is stabilized by many N—H···O and N—H···N types intra and intermolecular interactions (Table 1, Fig. 2).