organic compounds
2-Amino-1,3-thiazolium dihydrogen phosphate
aDepartment of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128 40 Prague 2, Czech Republic, and bInstitute of Physics of the ASCR, Na Slovance 2, 182 21 Prague 8, Czech Republic
*Correspondence e-mail: irena.mat@atlas.cz
In the title compound, C3H5N2S+·H2PO4−, the dihydrogen phosphate anions form infinite chains along [001] via short O—H⋯O hydrogen bonds. The 2-aminothiazolium cations interconnect these chains into a three-dimensional network by short linear or bifurcated N—H⋯O and weak C—H⋯O hydrogen bonds.
Related literature
For metal complexes of 2-aminothiazole and its derivatives used in medicine, see: De et al. (2008); Aridoss et al. (2009); Cukurovali et al. (2006); Franklin et al. (2008); Li et al. (2009); Alexandru et al. (2010); Mura et al. (2005). For the use of 2-aminothiazole in the decontamination of aqueous media or ethanol fuel, see: Cristante et al. (2006, 2007); Takeuchi et al. (2007). For uses of 2-aminothiazole and its derivatives as anticorrosive films, see: Ciftci et al. (2011); Solmaz (2011). For non-linear optical properties and for structural properties of closely related compounds, see: Yesilel et al. (2008); Matulková et al. (2007, 2008, 2011a,b).
Experimental
Crystal data
|
Refinement
|
Data collection: CrysAlis PRO (Agilent, 2010); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
https://doi.org/10.1107/S160053681104935X/im2339sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S160053681104935X/im2339Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S160053681104935X/im2339Isup3.cml
Crystals of the title compound were obtained from a solution of 1.0 g of 2-aminothiazole (97%, Aldrich) and 0.67 ml of phosphoric acid (85%, Lachema) in 200 ml of water. The solution was left to crystallize at room temperature for several weeks. The colourless crystals obtained were filtered off, washed with methanol and dried in vacuum desiccator over KOH.
H atoms attached to C atoms were calculated in geometrically idealized positions, Csp2 - H = 0.93 Å. The positions of H atoms attached to O and N atoms were localized in difference Fourier maps. All hydrogen atoms were constrained to ride on their parent atoms during
with Uiso(H) = 1.2 Ueq(pivot atom).2-Aminothiazole and its derivatives have been investigated as potential compounds for the modification of TiO2 or SiO2 particles used for the sorption and photocatalytic reduction of Hg(II) (Cristante et al., 2006) or phenol (Cristante et al., 2007) in aqueous solutions. 2-Aminothiazole can be also used for electrode modification (Ciftci et al., 2011; Solmaz, 2011) or for the detection of metal impurities (Takeuchi et al., 2007) in ethanol fuel.
Metal complexes of 2-aminothiazole and its derivatives have been studied for treatment of Alzheimers disease (Li et al., 2009), antitumor activity (Alexandru et al., 2010), and activity against leukemia (Mura et al., 2005). Thiazole derivatives have been used as antioxidants (De et al., 2008), antibacterial drugs (Aridoss et al., 2009) and fungicides (Cukurovali et al., 2006). Anti-inflammatory, analgesic and antipyretic activities were observed for thiazolyl and benzothiazolyl derivatives (Franklin et al., 2008).
Only one salt, bis(2-aminothiazolium) squarate dihydrate (Yesilel et al., 2008), was studied in detail for the extensive system of hydrogen bonds, which are very attractive not only in the biological and biochemical processes but also in the field of material and supramolecular chemistry.
The title salt was prepared during the research motivated by the study of salts or cocrystals of the highly related aminotriazoles (Matulková et al., 2011a, 2008, 2007) and 2-aminothiazole (Matulková et al., 2011b), while searching for materials with potential non-linear optical properties. Unfortunately, the title salt, 2-aminothiazolium dihydrogen phosphate (Fig. 1), crystallizes in the monoclinic system in the centrosymmetric
P21/c, which excludes the existence of the second order non-linear optical properties. The of the title compound is based on chains of anions interconnected via two O—H···O hydrogen bonds with donor-acceptor distances 2.504 (2) and 2.596 (2) Å. Chains are interconnected by 2-aminothiazolium(1+) cations via N—H···O (2.728 (2)–3.202 (3) Å) and weak C—H···O (3.271 (3) Å) hydrogen bond interactions into a three-dimensional network. Each cation interacts with three anionic chains by means of two linear hydrogen bonds towards one of the chains, one linear hydrogen bond to another chain and one bifurcated hydrogen bond to the third chain (Fig. 3). The anionic chains are oriented along the axis c (see Fig. 2).For metal complexes of 2-aminothiazole and its derivatives used in medicine, see: De et al. (2008); Aridoss et al. (2009); Cukurovali et al. (2006); Franklin et al. (2008); Li et al. (2009); Alexandru et al. (2010); Mura et al. (2005). Forthe us of 2-aminothiazole in the decontamination of aqueous media or ethanol fuel, see: Cristante et al. (2006, 2007); Takeuchi et al. (2007). For uses of 2-aminothiazole and its derivatives as anticorrosive films, see: Ciftci et al. (2011); Solmaz (2011). For non-linear optical properties and for structural properties of closely related compounds, see: Yesilel et al. (2008); Matulková et al. (2007, 2008, 2011a,b).
Data collection: CrysAlis PRO (Agilent, 2010); cell
CrysAlis PRO (Agilent, 2010); data reduction: CrysAlis PRO (Agilent, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: publCIF (Westrip, 2010).Fig. 1. The molecular structure of 2-aminothiazolium dihydrogen phosphate. Displacement ellipsoids are drawn at the 50% probability level. | |
Fig. 2. Packing scheme of the anions in the crystals of 2-aminothiazolium dihydrogen phosphate (projection to ac plane). Dashed lines indicate the hydrogen bonds. | |
Fig. 3. Packing scheme of the structure of 2-aminothiazolium dihydrogen phosphate (projection to ac plane). Hydrogen bonds are indicated by dashed lines. |
C3H5N2S+·H2PO4− | F(000) = 408 |
Mr = 198.14 | Dx = 1.648 Mg m−3 |
Monoclinic, P21/c | Cu Kα radiation, λ = 1.5418 Å |
Hall symbol: -P 2ybc | Cell parameters from 6931 reflections |
a = 9.7581 (2) Å | θ = 4.5–66.8° |
b = 9.8826 (2) Å | µ = 5.35 mm−1 |
c = 8.2794 (1) Å | T = 120 K |
β = 90.680 (2)° | Plate, colourless |
V = 798.37 (2) Å3 | 0.47 × 0.17 × 0.13 mm |
Z = 4 |
Agilent Xcalibur Atlas Gemini ultra diffractometer | 1419 independent reflections |
Radiation source: Enhance Ultra (Cu) X-ray Source | 1389 reflections with I > 2σ(I) |
Mirror monochromator | Rint = 0.025 |
Detector resolution: 10.3874 pixels mm-1 | θmax = 66.9°, θmin = 4.5° |
Rotation method data acquisition using ω scans | h = −11→11 |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2010) | k = −11→11 |
Tmin = 0.453, Tmax = 1.000 | l = −9→7 |
7670 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)] = 0.027 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.070 | H-atom parameters constrained |
S = 1.07 | w = 1/[σ2(Fo2) + (0.0339P)2 + 0.5451P] where P = (Fo2 + 2Fc2)/3 |
1419 reflections | (Δ/σ)max = 0.001 |
100 parameters | Δρmax = 0.30 e Å−3 |
0 restraints | Δρmin = −0.37 e Å−3 |
C3H5N2S+·H2PO4− | V = 798.37 (2) Å3 |
Mr = 198.14 | Z = 4 |
Monoclinic, P21/c | Cu Kα radiation |
a = 9.7581 (2) Å | µ = 5.35 mm−1 |
b = 9.8826 (2) Å | T = 120 K |
c = 8.2794 (1) Å | 0.47 × 0.17 × 0.13 mm |
β = 90.680 (2)° |
Agilent Xcalibur Atlas Gemini ultra diffractometer | 1419 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2010) | 1389 reflections with I > 2σ(I) |
Tmin = 0.453, Tmax = 1.000 | Rint = 0.025 |
7670 measured reflections |
R[F2 > 2σ(F2)] = 0.027 | 0 restraints |
wR(F2) = 0.070 | H-atom parameters constrained |
S = 1.07 | Δρmax = 0.30 e Å−3 |
1419 reflections | Δρmin = −0.37 e Å−3 |
100 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. The hydrogen atoms were be localized from the difference Fourier map. Despite of that,all hydrogen atoms connected to C were constrained to ideal positions. The distance in N—H and O—H groups were left unrestrained. The isotropic temperature parameters of hydrogen atoms were calculated as 1.2*Ueq of the parent atom. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.66442 (17) | 0.80237 (17) | 0.1326 (2) | 0.0234 (4) | |
C2 | 0.85753 (17) | 0.75229 (19) | −0.0086 (2) | 0.0283 (4) | |
H1C2 | 0.9367 | 0.7716 | −0.0657 | 0.034* | |
C3 | 0.81429 (18) | 0.62710 (18) | 0.0206 (2) | 0.0301 (4) | |
H1C3 | 0.8591 | 0.5492 | −0.0132 | 0.036* | |
N1 | 0.57066 (15) | 0.87839 (15) | 0.20091 (19) | 0.0303 (4) | |
H1N1 | 0.5829 | 0.9648 | 0.2168 | 0.036* | |
H2N1 | 0.5099 | 0.8487 | 0.2540 | 0.036* | |
N2 | 0.77265 (14) | 0.85134 (15) | 0.05485 (17) | 0.0237 (3) | |
H1N2 | 0.7837 | 0.9509 | 0.0454 | 0.028* | |
O1 | 0.66404 (15) | 0.33219 (15) | 0.06047 (15) | 0.0400 (4) | |
H1O1 | 0.6636 | 0.3367 | −0.0481 | 0.048* | |
O2 | 0.65458 (14) | 0.14664 (14) | 0.25914 (15) | 0.0338 (3) | |
O3 | 0.80601 (12) | 0.12283 (11) | 0.01267 (14) | 0.0243 (3) | |
O4 | 0.87030 (12) | 0.28418 (13) | 0.23071 (15) | 0.0301 (3) | |
H1O4 | 0.8469 | 0.3189 | 0.3326 | 0.036* | |
P1 | 0.74805 (4) | 0.21447 (4) | 0.14002 (5) | 0.02120 (14) | |
S1 | 0.66311 (4) | 0.62775 (4) | 0.13014 (5) | 0.02763 (15) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0219 (8) | 0.0251 (9) | 0.0234 (9) | −0.0034 (6) | 0.0016 (6) | −0.0005 (6) |
C2 | 0.0210 (8) | 0.0331 (9) | 0.0310 (9) | 0.0010 (7) | 0.0049 (7) | −0.0035 (8) |
C3 | 0.0220 (9) | 0.0288 (10) | 0.0398 (10) | 0.0024 (7) | 0.0051 (7) | −0.0049 (7) |
N1 | 0.0277 (8) | 0.0262 (8) | 0.0373 (9) | −0.0053 (6) | 0.0157 (7) | −0.0039 (6) |
N2 | 0.0216 (7) | 0.0245 (7) | 0.0250 (7) | −0.0023 (5) | 0.0050 (5) | −0.0015 (6) |
O1 | 0.0515 (9) | 0.0436 (8) | 0.0247 (7) | 0.0265 (7) | −0.0028 (6) | −0.0091 (6) |
O2 | 0.0347 (7) | 0.0371 (7) | 0.0300 (7) | −0.0138 (6) | 0.0155 (5) | −0.0113 (6) |
O3 | 0.0287 (6) | 0.0216 (6) | 0.0227 (6) | 0.0031 (5) | 0.0089 (5) | 0.0001 (4) |
O4 | 0.0228 (6) | 0.0444 (8) | 0.0231 (6) | −0.0071 (5) | 0.0070 (5) | −0.0071 (5) |
P1 | 0.0201 (2) | 0.0230 (2) | 0.0207 (2) | 0.00071 (15) | 0.00549 (16) | −0.00254 (15) |
S1 | 0.0252 (2) | 0.0228 (2) | 0.0351 (3) | −0.00293 (15) | 0.00515 (18) | −0.00053 (16) |
C1—N1 | 1.317 (2) | N1—H2N1 | 0.7980 |
C1—N2 | 1.334 (2) | N2—H1N2 | 0.9934 |
C1—S1 | 1.726 (2) | O1—P1 | 1.564 (1) |
C2—C3 | 1.330 (3) | O1—H1O1 | 0.8996 |
C2—N2 | 1.389 (2) | O2—P1 | 1.508 (1) |
C2—H1C2 | 0.9300 | O3—P1 | 1.505 (1) |
C3—S1 | 1.741 (2) | O4—P1 | 1.562 (1) |
C3—H1C3 | 0.9300 | O4—H1O4 | 0.9413 |
N1—H1N1 | 0.8718 | ||
N1—C1—N2 | 123.9 (2) | C1—N2—C2 | 113.9 (2) |
N1—C1—S1 | 124.79 (13) | C1—N2—H1N2 | 119.0 |
N2—C1—S1 | 111.3 (2) | C2—N2—H1N2 | 127.1 |
C3—C2—N2 | 113.3 (2) | P1—O1—H1O1 | 117.0 |
C3—C2—H1C2 | 123.4 | P1—O4—H1O4 | 113.5 |
N2—C2—H1C2 | 123.4 | O3—P1—O2 | 115.19 (7) |
C2—C3—S1 | 111.3 (1) | O3—P1—O4 | 108.11 (7) |
C2—C3—H1C3 | 124.3 | O2—P1—O4 | 110.24 (7) |
S1—C3—H1C3 | 124.3 | O3—P1—O1 | 110.61 (7) |
C1—N1—H1N1 | 121.9 | O2—P1—O1 | 106.73 (8) |
C1—N1—H2N1 | 123.4 | O4—P1—O1 | 105.54 (8) |
H1N1—N1—H2N1 | 112.3 | C1—S1—C3 | 90.21 (8) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N1···O2i | 0.87 | 1.96 | 2.815 (2) | 167 |
N1—H2N1···O1ii | 0.80 | 2.31 | 3.076 (2) | 162 |
N1—H2N1···O2ii | 0.80 | 2.56 | 3.194 (2) | 137 |
N2—H1N2···O3i | 0.99 | 1.73 | 2.726 (2) | 175 |
O1—H1O1···O2iii | 0.90 | 1.61 | 2.504 (2) | 176 |
O4—H1O4···O3iv | 0.94 | 1.65 | 2.593 (2) | 179 |
C2—H1C2···O4v | 0.93 | 2.40 | 3.268 (2) | 155 |
Symmetry codes: (i) x, y+1, z; (ii) −x+1, y+1/2, −z+1/2; (iii) x, −y+1/2, z−1/2; (iv) x, −y+1/2, z+1/2; (v) −x+2, −y+1, −z. |
Experimental details
Crystal data | |
Chemical formula | C3H5N2S+·H2PO4− |
Mr | 198.14 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 120 |
a, b, c (Å) | 9.7581 (2), 9.8826 (2), 8.2794 (1) |
β (°) | 90.680 (2) |
V (Å3) | 798.37 (2) |
Z | 4 |
Radiation type | Cu Kα |
µ (mm−1) | 5.35 |
Crystal size (mm) | 0.47 × 0.17 × 0.13 |
Data collection | |
Diffractometer | Agilent Xcalibur Atlas Gemini ultra |
Absorption correction | Multi-scan (CrysAlis PRO; Agilent, 2010) |
Tmin, Tmax | 0.453, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7670, 1419, 1389 |
Rint | 0.025 |
(sin θ/λ)max (Å−1) | 0.596 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.027, 0.070, 1.07 |
No. of reflections | 1419 |
No. of parameters | 100 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.30, −0.37 |
Computer programs: CrysAlis PRO (Agilent, 2010), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2003), publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N1···O2i | 0.87 | 1.96 | 2.815 (2) | 167 |
N1—H2N1···O1ii | 0.80 | 2.31 | 3.076 (2) | 162 |
N1—H2N1···O2ii | 0.80 | 2.56 | 3.194 (2) | 137 |
N2—H1N2···O3i | 0.99 | 1.73 | 2.726 (2) | 175 |
O1—H1O1···O2iii | 0.90 | 1.61 | 2.504 (2) | 176 |
O4—H1O4···O3iv | 0.94 | 1.65 | 2.593 (2) | 179 |
C2—H1C2···O4v | 0.93 | 2.40 | 3.268 (2) | 155 |
Symmetry codes: (i) x, y+1, z; (ii) −x+1, y+1/2, −z+1/2; (iii) x, −y+1/2, z−1/2; (iv) x, −y+1/2, z+1/2; (v) −x+2, −y+1, −z. |
Acknowledgements
This work was supported financially by the Czech Science Foundation (grant No. 203/09/0878) and is part of the Long-term Research Plan of the Ministry of Education of the Czech Republic (No. MSM 0021620857), the Institutional research plan No. AVOZ10100521 of the Institute of Physics and the project Praemium Academiae of the Academy of Science of the Czech Republic.
References
Agilent (2010). CrysAlis PRO. Agilent Technologies, Yarnton, England. Google Scholar
Alexandru, M.-G., Velikovic, T. C., Jitaru, I., Grguric-Sipka, S. & Draghici, C. (2010). Cent. Eur. J. Chem. 8, 639–645. Web of Science CSD CrossRef CAS Google Scholar
Aridoss, G., Amirthaganesan, S., Kim, M. S., Kim, J. T. & Jeong, Y. T. (2009). Eur. J. Med. Chem. 44, 4199–4210. Web of Science CrossRef PubMed CAS Google Scholar
Ciftci, H., Testereci, H. N. & Oktem, Z. (2011). Polym. Bull. 66, 747–760. CAS Google Scholar
Cristante, V. M., Araujo, A. B., Jorge, S. M. A., Florentino, A. O., Valente, J. S. P. & Padilha, P. M. (2006). J. Braz. Chem. Soc. 17, 453–457. Web of Science CrossRef CAS Google Scholar
Cristante, V. M., Jorge, S. M. A., Valente, J. P. S., Saeki, M. J., Florentino, A. O. & Padilha, P. M. (2007). Thin Solid Films, 515, 5334–5340. CrossRef CAS Google Scholar
Cukurovali, A., Yilmaz, I., Gur, S. & Kazaz, C. (2006). Eur. J. Med. Chem. 41, 201–207. Web of Science CrossRef PubMed CAS Google Scholar
De, S., Adhikari, S., Tilak-Jain, J., Menon, V. P. & Devasagayam, T. P. A. (2008). Chem. Biol. Interact. 173, 215–223. Web of Science CrossRef PubMed CAS Google Scholar
Franklin, P. X., Pillai, A. D., Rathod, P. D., Yerande, S., Nivsarkar, M., Padh, H., Vasu, K. K. & Sudarsanam, V. (2008). Eur. J. Med. Chem. 43, 129–134. Web of Science CrossRef PubMed CAS Google Scholar
Li, J., Du, J., Xia, L., Liu, H., Yao, X. & Liu, M. (2009). Anal. Chim. Acta, 631, 29–39. Web of Science CrossRef PubMed CAS Google Scholar
Matulková, I., Císařová, I. & Němec, I. (2011a). Acta Cryst. E67, o18–o19. Web of Science CSD CrossRef IUCr Journals Google Scholar
Matulková, I., Němec, I., Cihelka, J., Pojarová, M. & Dušek, M. (2011b). Acta Cryst. E67, o3216–o3217. Web of Science CSD CrossRef IUCr Journals Google Scholar
Matulková, I., Němec, I., Císařová, I., Němec, P. & Mička, Z. (2007). J. Mol. Struct. 834–836, 328–335. Google Scholar
Matulková, I., Němec, I., Teubner, K., Němec, P. & Mička, Z. (2008). J. Mol. Struct. 837, 46–60. Google Scholar
Mura, P., Piccioli, F., Gabbiani, C., Camalli, M. & Messori, L. (2005). Inorg. Chem. 44, 4897–4899. Web of Science CSD CrossRef PubMed CAS Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Solmaz, R. (2011). Progr. Org. Coat. 70, 122–126. Web of Science CrossRef CAS Google Scholar
Spek, A. L. (2003). J. Appl. Cryst. 36, 7–13. Web of Science CrossRef CAS IUCr Journals Google Scholar
Takeuchi, R. M., Santos, A. L., Padilha, P. M. & Stradiotto, N. R. (2007). Talanta, 71, 771–777. Web of Science CrossRef PubMed CAS Google Scholar
Westrip, S. P. (2010). J. Appl. Cryst. 43, 920–925. Web of Science CrossRef CAS IUCr Journals Google Scholar
Yesilel, O. Y., Odabaşoğlu, M. & Büyükgüngör, O. (2008). J. Mol. Struct. 874, 151–158. CAS Google Scholar
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.
2-Aminothiazole and its derivatives have been investigated as potential compounds for the modification of TiO2 or SiO2 particles used for the sorption and photocatalytic reduction of Hg(II) (Cristante et al., 2006) or phenol (Cristante et al., 2007) in aqueous solutions. 2-Aminothiazole can be also used for electrode modification (Ciftci et al., 2011; Solmaz, 2011) or for the detection of metal impurities (Takeuchi et al., 2007) in ethanol fuel.
Metal complexes of 2-aminothiazole and its derivatives have been studied for treatment of Alzheimers disease (Li et al., 2009), antitumor activity (Alexandru et al., 2010), and activity against leukemia (Mura et al., 2005). Thiazole derivatives have been used as antioxidants (De et al., 2008), antibacterial drugs (Aridoss et al., 2009) and fungicides (Cukurovali et al., 2006). Anti-inflammatory, analgesic and antipyretic activities were observed for thiazolyl and benzothiazolyl derivatives (Franklin et al., 2008).
Only one salt, bis(2-aminothiazolium) squarate dihydrate (Yesilel et al., 2008), was studied in detail for the extensive system of hydrogen bonds, which are very attractive not only in the biological and biochemical processes but also in the field of material and supramolecular chemistry.
The title salt was prepared during the research motivated by the study of salts or cocrystals of the highly related aminotriazoles (Matulková et al., 2011a, 2008, 2007) and 2-aminothiazole (Matulková et al., 2011b), while searching for materials with potential non-linear optical properties. Unfortunately, the title salt, 2-aminothiazolium dihydrogen phosphate (Fig. 1), crystallizes in the monoclinic system in the centrosymmetric space group P21/c, which excludes the existence of the second order non-linear optical properties. The crystal structure of the title compound is based on chains of anions interconnected via two O—H···O hydrogen bonds with donor-acceptor distances 2.504 (2) and 2.596 (2) Å. Chains are interconnected by 2-aminothiazolium(1+) cations via N—H···O (2.728 (2)–3.202 (3) Å) and weak C—H···O (3.271 (3) Å) hydrogen bond interactions into a three-dimensional network. Each cation interacts with three anionic chains by means of two linear hydrogen bonds towards one of the chains, one linear hydrogen bond to another chain and one bifurcated hydrogen bond to the third chain (Fig. 3). The anionic chains are oriented along the axis c (see Fig. 2).