organic compounds
2-Amino-6-methyl-1,3-benzothiazole–octanedioic acid (2/1)
aCollege of Chemistry and Life Science, Tianjin Key Laboratory of Structure and Performance for Functional Molecule, Tianjin Normal University, Tianjin 300387, People's Republic of China
*Correspondence e-mail: luckyms@126.com
Cocrystallization of 2-amino-6-methy-1,3-benzothiazole with octanedioic acid in a mixed methanol–water medium afforded the title 2:1 cocrystal, 2C8H8N2S·C8H14O4. The octanedioic acid molecule is located on an inversion centre. In the crystal, intermolecular N—H⋯O and O—H⋯O hydrogen bonds connect the components into a three-dimensional network.
Related literature
For molecular self-assembly and its application in crystal engineering, see: Yang et al. (2007); Hunter (1993); Zhao et al. (2007). For the structures and properties of metal complexes and co-crystals with aminobenzothiazole and its derivatives, see: Shi et al. (2009); Lynch et al. (1999); Chen et al. (2008); Zhang et al. (2009). For the structure and performance of octanedioic acid-based metal complexes and co-crystals, see: Geraghty et al. (1999); McCann et al. (1995); Peral et al. (2001).
Experimental
Crystal data
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Refinement
|
Data collection: APEX2 (Bruker, 2003); cell SAINT (Bruker, 2001); 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) and DIAMOND (Brandenburg & Berndt, 1999); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536809042652/bt5102sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809042652/bt5102Isup2.hkl
2-Amino-6-methylbenzothiazole (16.4 mg, 0.1 mmol) and octanedioic acid (17.4 mg, 0.1 mmol) were dissolved in a mixed methanol-water solution (1:1, 10 ml). The resulting mixture was stirring for one hour and filtered. The colorless filtrate was left to stand at room temperature. The colorless block-shaped crystals suitable for x-ray diffraction were isolated by slow evaporation of the solvent in one week (yield: 30.0% based on 2-amino-6-methylbenzothiazole). Analysis calculated for C48H60N8O8S4: C 57.35, H 6.02, N 11.15%; found: C 57.55, H 6.00, N 11.48%.
H-atoms were located in difference maps, but were subsequently placed in calculated positions and treated as riding, with C–H = 0.93 (aromatic) or 0.96 (methyl and methylene)Å, O – H = 0.82 Å, and N – H = 0.86 Å. All H atoms were allocated displacement parameters related to those of their parent atoms [Uiso(H)] = 1.2 Ueq (C, N, O) or Uiso(H)] = 1.5 Ueq (Cmethyl)].
Nowadays, molecular self-assembly driven by popular coordination bonds and weak intermolecular non-covalent interactions (hydrogen-bonding, π···π stack, electrostatic interactions and so on), has been attracting more and more interest in biochemistry, life science and new material fields (Hunter, 1993; Yang et al., 2007; Zhao et al., 2007). In this regard, aminobenzothiazole and its varios derivatives have been becoming one of the excellent building blocks with multiple hydrogen-bonding and metal ion binding sites and have been extensively applied in new materials, biochemistry and agriculture chemistry, due to the lower toxicity, high biological activity and excellent chemical reactivity (Shi et al., 2009; Lynch et al., 1999; Chen et al., 2008; Zhang et al., 2009).On the other hand, the long octanedioic acid with variable deprotonated form and flexible aliphatic chain has also exhibited novel functions in the fields of metal complexes and molecular co-crystals (McCann et al. 1995; Peral et al. 2001; Geraghty et al. 1999).
Herein, as a continuation of molecular assembly behavior in the solid state, the rigid 2-amino-6-methy-1,3-benzothiazole and flexible octanedioic acid were selected as building blocks to cocrystallize. Consequently, an intermolecular hydrogen bonded adduct, (I), was obtained in the mixed methanol-water medium, exhibiting three-dimensional network by intermolecular hydrogen-bonding interactions.
As shown in Fig. 1, the
of (I) contains one neutral 2-amino-6-methy-1,3-benzothiazole molecule with no crystallographically imposed symmetry and half a octanedioic acid located on a centre of inversion. Obviously, no proton transfer was observed for the neutral cocrystal, which is different from the 2-aminobenzothiazolium 2,4-dicarboxybenzoate monohydrate (Zhang et al., 2009). The exocyclic amino group of 2-amino-6-methy-1,3-benzothiazole is roughly coplanar with the benzothiazole ring. Similarily, the carboxylic residues of octanedioic acid are also co-planar with their long aliphatic chain. In the packing structure of I, two pairs of the intermolecuar O2—H2 ···N1 and N2—H2A ···O1 hydrogen-bonding interactions (Table 1) connect the two 2-amino-6-methy-1,3-benzothiazole molecules and one octanedioic acid into a trimer. Furthermore, the adjacent trimers are hydrogen-bonded together by N2—H2B···O1 to generate a three dimensional network.For the molecular self-assembly and its application in crystal engineering, see: Yang et al. (2007); Hunter (1993); Zhao et al. (2007). For the structures and properties of metal complexes and co-crystals with aminobenzothiazole and its derivatives, see: Shi et al. (2009); Lynch et al. (1999); Chen et al. (2008); Zhang et al. (2009). For the structure and performance of octanedioic acid-based metal complexes and co-crystals, see: Geraghty et al. (1999); McCann et al. (1995); Peral et al. (2001).
Data collection: APEX2 (Bruker, 2003); cell
SAINT (Bruker, 2001); data reduction: SAINT (Bruker, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg & Berndt, 1999); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).2C8H8N2S·C8H14O4 | F(000) = 532 |
Mr = 502.64 | Dx = 1.295 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
a = 12.4372 (12) Å | Cell parameters from 2130 reflections |
b = 7.9165 (8) Å | θ = 2.5–24.4° |
c = 16.6061 (12) Å | µ = 0.24 mm−1 |
β = 127.992 (5)° | T = 293 K |
V = 1288.6 (2) Å3 | Block, colourless |
Z = 2 | 0.25 × 0.20 × 0.18 mm |
Bruker APEXII CCD area-detector diffractometer | 2271 independent reflections |
Radiation source: fine-focus sealed tube | 1767 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.019 |
φ and ω scans | θmax = 25.0°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −14→13 |
Tmin = 0.942, Tmax = 0.958 | k = −7→9 |
6745 measured reflections | l = −19→19 |
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)] = 0.033 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.098 | H-atom parameters constrained |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0501P)2 + 0.215P] where P = (Fo2 + 2Fc2)/3 |
2271 reflections | (Δ/σ)max = 0.001 |
156 parameters | Δρmax = 0.16 e Å−3 |
0 restraints | Δρmin = −0.20 e Å−3 |
2C8H8N2S·C8H14O4 | V = 1288.6 (2) Å3 |
Mr = 502.64 | Z = 2 |
Monoclinic, P21/c | Mo Kα radiation |
a = 12.4372 (12) Å | µ = 0.24 mm−1 |
b = 7.9165 (8) Å | T = 293 K |
c = 16.6061 (12) Å | 0.25 × 0.20 × 0.18 mm |
β = 127.992 (5)° |
Bruker APEXII CCD area-detector diffractometer | 2271 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 1767 reflections with I > 2σ(I) |
Tmin = 0.942, Tmax = 0.958 | Rint = 0.019 |
6745 measured reflections |
R[F2 > 2σ(F2)] = 0.033 | 0 restraints |
wR(F2) = 0.098 | H-atom parameters constrained |
S = 1.05 | Δρmax = 0.16 e Å−3 |
2271 reflections | Δρmin = −0.20 e Å−3 |
156 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 | ||
S1 | 0.27303 (5) | −0.11551 (6) | 1.15536 (3) | 0.06084 (19) | |
O1 | 0.41522 (14) | 0.48915 (16) | 1.10448 (9) | 0.0707 (4) | |
O2 | 0.24755 (15) | 0.39416 (17) | 0.95120 (9) | 0.0743 (4) | |
H2 | 0.2495 | 0.3168 | 0.9849 | 0.111* | |
N1 | 0.23024 (15) | 0.12817 (17) | 1.03421 (11) | 0.0561 (4) | |
N2 | 0.40617 (17) | 0.1802 (2) | 1.20575 (12) | 0.0760 (5) | |
H2A | 0.4222 | 0.2778 | 1.1924 | 0.091* | |
H2B | 0.4541 | 0.1450 | 1.2679 | 0.091* | |
C1 | 0.13613 (17) | 0.0017 (2) | 0.97271 (13) | 0.0517 (4) | |
C2 | 0.14393 (17) | −0.1411 (2) | 1.02435 (13) | 0.0534 (4) | |
C3 | 0.0586 (2) | −0.2780 (3) | 0.97316 (14) | 0.0700 (6) | |
H3 | 0.0656 | −0.3730 | 1.0090 | 0.084* | |
C4 | −0.0376 (2) | −0.2717 (3) | 0.86769 (15) | 0.0711 (6) | |
C5 | −0.0446 (2) | −0.1297 (3) | 0.81731 (15) | 0.0716 (6) | |
H5 | −0.1090 | −0.1260 | 0.7465 | 0.086* | |
C6 | 0.03990 (19) | 0.0074 (3) | 0.86719 (13) | 0.0656 (5) | |
H6 | 0.0325 | 0.1020 | 0.8308 | 0.079* | |
C7 | 0.30726 (18) | 0.0837 (2) | 1.13027 (13) | 0.0541 (4) | |
C8 | −0.1328 (3) | −0.4193 (4) | 0.81008 (19) | 0.1066 (9) | |
H8A | −0.1898 | −0.3967 | 0.7381 | 0.160* | |
H8B | −0.1888 | −0.4354 | 0.8311 | 0.160* | |
H8C | −0.0803 | −0.5196 | 0.8246 | 0.160* | |
C9 | 0.33968 (18) | 0.5053 (2) | 1.01209 (13) | 0.0537 (4) | |
C10 | 0.34445 (19) | 0.6517 (2) | 0.95779 (13) | 0.0570 (5) | |
H10A | 0.2554 | 0.7052 | 0.9163 | 0.068* | |
H10B | 0.3616 | 0.6092 | 0.9118 | 0.068* | |
C11 | 0.45049 (18) | 0.7847 (2) | 1.02578 (12) | 0.0541 (4) | |
H11A | 0.5402 | 0.7330 | 1.0659 | 0.065* | |
H11B | 0.4351 | 0.8265 | 1.0728 | 0.065* | |
C12 | 0.44826 (18) | 0.9325 (2) | 0.96670 (13) | 0.0564 (4) | |
H12A | 0.4649 | 0.8906 | 0.9204 | 0.068* | |
H12B | 0.3580 | 0.9825 | 0.9257 | 0.068* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0674 (3) | 0.0618 (3) | 0.0453 (3) | −0.0065 (2) | 0.0307 (2) | 0.0036 (2) |
O1 | 0.0878 (9) | 0.0557 (8) | 0.0427 (7) | −0.0119 (7) | 0.0270 (7) | 0.0017 (6) |
O2 | 0.0888 (10) | 0.0590 (9) | 0.0466 (7) | −0.0179 (7) | 0.0274 (7) | 0.0011 (6) |
N1 | 0.0597 (9) | 0.0503 (9) | 0.0469 (8) | 0.0005 (7) | 0.0272 (7) | 0.0031 (7) |
N2 | 0.0856 (12) | 0.0609 (10) | 0.0485 (9) | −0.0145 (9) | 0.0246 (9) | −0.0005 (8) |
C1 | 0.0489 (9) | 0.0540 (10) | 0.0480 (9) | 0.0032 (8) | 0.0276 (8) | 0.0002 (8) |
C2 | 0.0515 (10) | 0.0613 (11) | 0.0464 (9) | −0.0034 (8) | 0.0296 (8) | 0.0004 (8) |
C3 | 0.0740 (13) | 0.0726 (14) | 0.0621 (12) | −0.0200 (11) | 0.0413 (11) | −0.0048 (10) |
C4 | 0.0610 (12) | 0.0830 (15) | 0.0565 (11) | −0.0164 (11) | 0.0296 (10) | −0.0111 (11) |
C5 | 0.0592 (12) | 0.0876 (16) | 0.0461 (10) | −0.0005 (11) | 0.0215 (9) | −0.0039 (11) |
C6 | 0.0621 (11) | 0.0698 (13) | 0.0470 (10) | 0.0057 (10) | 0.0245 (9) | 0.0068 (9) |
C7 | 0.0588 (10) | 0.0519 (10) | 0.0460 (9) | 0.0016 (8) | 0.0294 (9) | 0.0009 (8) |
C8 | 0.0974 (18) | 0.117 (2) | 0.0769 (16) | −0.0487 (16) | 0.0392 (14) | −0.0237 (15) |
C9 | 0.0618 (11) | 0.0464 (10) | 0.0449 (10) | 0.0025 (8) | 0.0288 (9) | 0.0002 (8) |
C10 | 0.0641 (11) | 0.0534 (10) | 0.0465 (9) | 0.0020 (9) | 0.0304 (9) | 0.0046 (8) |
C11 | 0.0611 (11) | 0.0489 (10) | 0.0479 (9) | 0.0039 (8) | 0.0313 (9) | 0.0055 (8) |
C12 | 0.0618 (11) | 0.0547 (10) | 0.0475 (9) | 0.0039 (8) | 0.0310 (9) | 0.0085 (8) |
S1—C2 | 1.7469 (18) | C5—C6 | 1.377 (3) |
S1—C7 | 1.7491 (19) | C5—H5 | 0.9300 |
O1—C9 | 1.2159 (19) | C6—H6 | 0.9300 |
O2—C9 | 1.297 (2) | C8—H8A | 0.9600 |
O2—H2 | 0.8200 | C8—H8B | 0.9600 |
N1—C7 | 1.306 (2) | C8—H8C | 0.9600 |
N1—C1 | 1.394 (2) | C9—C10 | 1.492 (2) |
N2—C7 | 1.331 (2) | C10—C11 | 1.513 (2) |
N2—H2A | 0.8599 | C10—H10A | 0.9700 |
N2—H2B | 0.8601 | C10—H10B | 0.9700 |
C1—C2 | 1.386 (2) | C11—C12 | 1.516 (2) |
C1—C6 | 1.387 (2) | C11—H11A | 0.9700 |
C2—C3 | 1.383 (3) | C11—H11B | 0.9700 |
C3—C4 | 1.386 (3) | C12—C12i | 1.507 (4) |
C3—H3 | 0.9300 | C12—H12A | 0.9700 |
C4—C5 | 1.371 (3) | C12—H12B | 0.9700 |
C4—C8 | 1.513 (3) | ||
C2—S1—C7 | 88.84 (8) | C4—C8—H8A | 109.5 |
C9—O2—H2 | 109.5 | C4—C8—H8B | 109.5 |
C7—N1—C1 | 110.78 (15) | H8A—C8—H8B | 109.5 |
C7—N2—H2A | 120.0 | C4—C8—H8C | 109.5 |
C7—N2—H2B | 120.0 | H8A—C8—H8C | 109.5 |
H2A—N2—H2B | 120.0 | H8B—C8—H8C | 109.5 |
C2—C1—C6 | 119.08 (17) | O1—C9—O2 | 122.54 (16) |
C2—C1—N1 | 115.16 (15) | O1—C9—C10 | 123.85 (16) |
C6—C1—N1 | 125.76 (17) | O2—C9—C10 | 113.60 (15) |
C3—C2—C1 | 121.59 (17) | C9—C10—C11 | 115.48 (14) |
C3—C2—S1 | 128.73 (15) | C9—C10—H10A | 108.4 |
C1—C2—S1 | 109.67 (13) | C11—C10—H10A | 108.4 |
C2—C3—C4 | 119.16 (19) | C9—C10—H10B | 108.4 |
C2—C3—H3 | 120.4 | C11—C10—H10B | 108.4 |
C4—C3—H3 | 120.4 | H10A—C10—H10B | 107.5 |
C5—C4—C3 | 118.79 (19) | C10—C11—C12 | 113.19 (14) |
C5—C4—C8 | 121.09 (19) | C10—C11—H11A | 108.9 |
C3—C4—C8 | 120.1 (2) | C12—C11—H11A | 108.9 |
C4—C5—C6 | 122.73 (18) | C10—C11—H11B | 108.9 |
C4—C5—H5 | 118.6 | C12—C11—H11B | 108.9 |
C6—C5—H5 | 118.6 | H11A—C11—H11B | 107.8 |
C5—C6—C1 | 118.65 (19) | C12i—C12—C11 | 113.92 (17) |
C5—C6—H6 | 120.7 | C12i—C12—H12A | 108.8 |
C1—C6—H6 | 120.7 | C11—C12—H12A | 108.8 |
N1—C7—N2 | 123.60 (17) | C12i—C12—H12B | 108.8 |
N1—C7—S1 | 115.54 (13) | C11—C12—H12B | 108.8 |
N2—C7—S1 | 120.86 (14) | H12A—C12—H12B | 107.7 |
C7—N1—C1—C2 | −0.4 (2) | C8—C4—C5—C6 | 179.7 (2) |
C7—N1—C1—C6 | −179.52 (17) | C4—C5—C6—C1 | 0.1 (3) |
C6—C1—C2—C3 | 0.3 (3) | C2—C1—C6—C5 | −0.2 (3) |
N1—C1—C2—C3 | −178.90 (17) | N1—C1—C6—C5 | 178.93 (18) |
C6—C1—C2—S1 | 179.83 (14) | C1—N1—C7—N2 | 179.78 (17) |
N1—C1—C2—S1 | 0.64 (19) | C1—N1—C7—S1 | 0.0 (2) |
C7—S1—C2—C3 | 178.97 (19) | C2—S1—C7—N1 | 0.34 (15) |
C7—S1—C2—C1 | −0.53 (13) | C2—S1—C7—N2 | −179.49 (17) |
C1—C2—C3—C4 | −0.4 (3) | O1—C9—C10—C11 | −0.7 (3) |
S1—C2—C3—C4 | −179.81 (16) | O2—C9—C10—C11 | −179.99 (16) |
C2—C3—C4—C5 | 0.3 (3) | C9—C10—C11—C12 | −178.51 (16) |
C2—C3—C4—C8 | −179.5 (2) | C10—C11—C12—C12i | 179.07 (19) |
C3—C4—C5—C6 | −0.2 (3) |
Symmetry code: (i) −x+1, −y+2, −z+2. |
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2···N1 | 0.82 | 1.79 | 2.5973 (19) | 169 |
N2—H2B···O1ii | 0.86 | 2.10 | 2.922 (2) | 159 |
N2—H2A···O1 | 0.86 | 2.19 | 3.009 (2) | 160 |
Symmetry code: (ii) −x+1, y−1/2, −z+5/2. |
Experimental details
Crystal data | |
Chemical formula | 2C8H8N2S·C8H14O4 |
Mr | 502.64 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 12.4372 (12), 7.9165 (8), 16.6061 (12) |
β (°) | 127.992 (5) |
V (Å3) | 1288.6 (2) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.24 |
Crystal size (mm) | 0.25 × 0.20 × 0.18 |
Data collection | |
Diffractometer | Bruker APEXII CCD area-detector |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.942, 0.958 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 6745, 2271, 1767 |
Rint | 0.019 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.033, 0.098, 1.05 |
No. of reflections | 2271 |
No. of parameters | 156 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.16, −0.20 |
Computer programs: APEX2 (Bruker, 2003), SAINT (Bruker, 2001), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg & Berndt, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2···N1 | 0.82 | 1.79 | 2.5973 (19) | 168.5 |
N2—H2B···O1i | 0.86 | 2.10 | 2.922 (2) | 159.1 |
N2—H2A···O1 | 0.86 | 2.19 | 3.009 (2) | 159.8 |
Symmetry code: (i) −x+1, y−1/2, −z+5/2. |
Acknowledgements
The author gratefully acknowledges financial support by Tianjin Normal University.
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Nowadays, molecular self-assembly driven by popular coordination bonds and weak intermolecular non-covalent interactions (hydrogen-bonding, π···π stack, electrostatic interactions and so on), has been attracting more and more interest in biochemistry, life science and new material fields (Hunter, 1993; Yang et al., 2007; Zhao et al., 2007). In this regard, aminobenzothiazole and its varios derivatives have been becoming one of the excellent building blocks with multiple hydrogen-bonding and metal ion binding sites and have been extensively applied in new materials, biochemistry and agriculture chemistry, due to the lower toxicity, high biological activity and excellent chemical reactivity (Shi et al., 2009; Lynch et al., 1999; Chen et al., 2008; Zhang et al., 2009).On the other hand, the long octanedioic acid with variable deprotonated form and flexible aliphatic chain has also exhibited novel functions in the fields of metal complexes and molecular co-crystals (McCann et al. 1995; Peral et al. 2001; Geraghty et al. 1999).
Herein, as a continuation of molecular assembly behavior in the solid state, the rigid 2-amino-6-methy-1,3-benzothiazole and flexible octanedioic acid were selected as building blocks to cocrystallize. Consequently, an intermolecular hydrogen bonded adduct, (I), was obtained in the mixed methanol-water medium, exhibiting three-dimensional network by intermolecular hydrogen-bonding interactions.
As shown in Fig. 1, the asymmetric unit of (I) contains one neutral 2-amino-6-methy-1,3-benzothiazole molecule with no crystallographically imposed symmetry and half a octanedioic acid located on a centre of inversion. Obviously, no proton transfer was observed for the neutral cocrystal, which is different from the 2-aminobenzothiazolium 2,4-dicarboxybenzoate monohydrate (Zhang et al., 2009). The exocyclic amino group of 2-amino-6-methy-1,3-benzothiazole is roughly coplanar with the benzothiazole ring. Similarily, the carboxylic residues of octanedioic acid are also co-planar with their long aliphatic chain. In the packing structure of I, two pairs of the intermolecuar O2—H2 ···N1 and N2—H2A ···O1 hydrogen-bonding interactions (Table 1) connect the two 2-amino-6-methy-1,3-benzothiazole molecules and one octanedioic acid into a trimer. Furthermore, the adjacent trimers are hydrogen-bonded together by N2—H2B···O1 to generate a three dimensional network.