2-Amino-4-methyl­pyridinium 2-hy­droxy­benzoate

Hemamalini, M.; Fun, H.-K.

doi:10.1107/S160053681002965X

organic compounds

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ISSN: 2056-9890

Volume 66| Part 8| August 2010| Pages o2151-o2152

https://doi.org/10.1107/S160053681002965X

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2-Amino-4-methylpyridinium 2-hydroxybenzoate

Madhukar Hemamalini ^a and Hoong-Kun Fun ^a ^*‡

^aX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
^*Correspondence e-mail: hkfun@usm.my

(Received 21 July 2010; accepted 26 July 2010; online 31 July 2010)

The asymmetric unit of the title molecular salt, C₆H₉N₂⁺·C₇H₅O₃⁻, contains two cations and two anions. Both the salicylate anions contain an intramolecular O—H⋯O hydrogen bond, which generates an S(6) ring. Both the 2-amino-4-methylpyridine molecules are protonated at their pyridine N atoms. In the crystal, both cations form two N—H⋯O hydrogen bonds to their adjacent anions, forming ion pairs. Further N—H⋯O links generate sheets lying parallel to the ab plane. In addition, weak C—H⋯O bonds and aromatic π–π stacking interactions [centroid–centroid distances = 3.5691 (9) and 3.6215 (9) Å] are observed between the cations and anions.

Related literature

For related structures, see: Navarro Ranninger et al. (1985 ); Luque et al. (1997 ); Qin et al. (1999 ); Jin et al. (2001); Albrecht et al. (2003 ); Kvick & Noordik (1977 ). For hydrogen-bond motifs, see: Bernstein et al. (1995 ). For bond-length data, see: Allen et al. (1987 ). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986 ).

Experimental

Crystal data

C₆H₉N₂⁺·C₇H₅O₃⁻
M_r = 246.26
Triclinic, $[P \overline 1]$
a = 7.2417 (2) Å
b = 12.5520 (3) Å
c = 14.7699 (3) Å
α = 68.752 (2)°
β = 82.038 (2)°
γ = 88.824 (2)°
V = 1238.58 (5) Å³
Z = 4
Mo Kα radiation
μ = 0.10 mm⁻¹
T = 100 K
0.32 × 0.10 × 0.04 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2009 ) T_min = 0.971, T_max = 0.996
23090 measured reflections
8280 independent reflections
5112 reflections with I > 2σ(I)
R_int = 0.047

Refinement

R[F² > 2σ(F²)] = 0.056
wR(F²) = 0.155
S = 1.00
8280 reflections
359 parameters
H atoms treated by a mixture of independent and constrained refinement
Δρ_max = 0.38 e Å⁻³
Δρ_min = −0.28 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3A—H1A3⋯O2A	0.99 (2)	1.61 (2)	2.5310 (16)	154 (2)
N1A—H1NA⋯O1Bⁱ	0.99 (2)	1.71 (2)	2.6965 (17)	174 (2)
N2A—H2NA⋯O1Aⁱⁱ	0.90 (2)	1.99 (2)	2.8645 (19)	164 (2)
O3B—H1B3⋯O2B	0.94 (3)	1.62 (3)	2.5179 (16)	158 (2)
N2A—H3NA⋯O2Bⁱ	0.94 (2)	1.91 (2)	2.8468 (18)	178 (2)
N1B—H1NB⋯O2A	0.96 (2)	1.76 (2)	2.7186 (17)	172.7 (17)
N2B—H2NB⋯O1A	0.96 (2)	1.84 (2)	2.7976 (18)	177.0 (16)
N2B—H3NB⋯O1Bⁱⁱⁱ	0.93 (2)	1.88 (2)	2.8097 (19)	174.3 (13)
C8B—H8BA⋯O2B^iv	0.93	2.47	3.357 (2)	159
C10B—H10B⋯O3B	0.93	2.38	3.039 (2)	128
Symmetry codes: (i) -x+1, -y+1, -z+1; (ii) x, y+1, z; (iii) x, y-1, z; (iv) -x, -y, -z+1.

Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008 ); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009 ).

Supporting information

Crystal structure: contains datablocks global, I. DOI: https://doi.org/10.1107/S160053681002965X/hb5564sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S160053681002965X/hb5564Isup2.hkl

checkCIF report

Comment top

There are numerous examples of 2-amino-substituted pyridine compounds in which the 2-aminopyridines act as neutral ligands (Navarro Ranninger et al., 1985; Luque et al., 1997; Qin et al., 1999) or as protonated cations (Luque et al., 1997; Jin et al., 2001; Albrecht et al., 2003). In order to study some hydrogen bonding interactions, the synthesis and structure of the title salt, (I), is presented here.

The asymmetric unit of the title compound consists of two crystallographically independent 2-amino-4-methylpyridinium cations (A and B) and two salicylate anions (A and B) (Fig. 1). Each 2-amino-4-methylpyridinium cation is planar, with a maximum deviation of 0.004 (1) Å for atom N1A in cation A and 0.006 (2) Å for atom C11B in cation B. In the cations, protonation at atoms N1A and N1B lead to a slight increase in the C9A—N1A—C10A [122.06 (14)°] and C9B—N1B—C10B [121.76 (13)°] angles compared to those observed in an unprotonated structure (Kvick & Noordik, 1977). The bond lengths (Allen et al., 1987) and angles are normal.

In the crystal structure (Fig. 2), the carboxylate groups of each salicylate anions interact with the corresponding 2-amino-4-methylpyridinium cations via a pair of N—H···O hydrogen bonds forming an R₂²(8) ring motif (Bernstein et al., 1995). Furthermore, these motifs are connected via N—H···O hydrogen bonds, forming a two-dimensional network parallel to the ab-plane. There is an intramolecular O—H···O hydrogen bond in the salicylate anions, which generates an S(6) ring motif. In addition, weak C—H···O and π–π interactions are observed between the cation-anion pairs, [Cg1(N1A/C8A–C12A)& Cg4(C1A–C6A)] and [Cg2(N1B/C8B–C12B) & Cg3(C1B–C6B)], with centroid-centroid distances of 3.5691 (9) Å (1+x, y, z) and 3.6215 (9) Å (-1+x, y, z), respectively.

Related literature top

For related structures, see: Navarro Ranninger et al. (1985); Luque et al. (1997); Qin et al. (1999); Jin et al. (2001); Albrecht et al. (2003); Kvick & Noordik (1977). For hydrogen-bond motifs, see: Bernstein et al. (1995). For bond-length data, see: Allen et al. (1987). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986).

Experimental top

A hot methanol solution (20 ml) of 2-amino-4-methylpyridine (54 mg, Aldrich) and salicylic acid (69 mg, Merck) were mixed and warmed over a heating magnetic stirrer hotplate for a few minutes. The resulting solution was allowed to cool slowly at room temperature and colourless needles of (I) appeared after a few days.

Structure description top

For related structures, see: Navarro Ranninger et al. (1985); Luque et al. (1997); Qin et al. (1999); Jin et al. (2001); Albrecht et al. (2003); Kvick & Noordik (1977). For hydrogen-bond motifs, see: Bernstein et al. (1995). For bond-length data, see: Allen et al. (1987). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986).

Computing details top

Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).

Figures top

	Fig. 1. The asymmetric unit of the title compound. Displacement ellipsoids are drawn at the 50% probability level.
	Fig. 2. Hydrogen bonding patterns in compound (I).

2-Amino-4-methylpyridinium 2-hydroxybenzoate top

Crystal data top

C₆H₉N₂⁺·C₇H₅O₃⁻	Z = 4
M_r = 246.26	F(000) = 520
Triclinic, P1	D_x = 1.321 Mg m⁻³
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 7.2417 (2) Å	Cell parameters from 3981 reflections
b = 12.5520 (3) Å	θ = 2.7–31.4°
c = 14.7699 (3) Å	µ = 0.10 mm⁻¹
α = 68.752 (2)°	T = 100 K
β = 82.038 (2)°	Needle, colourless
γ = 88.824 (2)°	0.32 × 0.10 × 0.04 mm
V = 1238.58 (5) Å³

Data collection top

Bruker APEXII CCD diffractometer	8280 independent reflections
Radiation source: fine-focus sealed tube	5112 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.047
φ and ω scans	θ_max = 31.6°, θ_min = 1.5°
Absorption correction: multi-scan (SADABS; Bruker, 2009)	h = −10→10
T_min = 0.971, T_max = 0.996	k = −15→18
23090 measured reflections	l = −21→21

Refinement top

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)] = 0.056	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.155	H atoms treated by a mixture of independent and constrained refinement
S = 1.00	w = 1/[σ²(F_o²) + (0.0755P)²] where P = (F_o² + 2F_c²)/3
8280 reflections	(Δ/σ)_max < 0.001
359 parameters	Δρ_max = 0.38 e Å⁻³
0 restraints	Δρ_min = −0.28 e Å⁻³

Crystal data top

C₆H₉N₂⁺·C₇H₅O₃⁻	γ = 88.824 (2)°
M_r = 246.26	V = 1238.58 (5) Å³
Triclinic, P1	Z = 4
a = 7.2417 (2) Å	Mo Kα radiation
b = 12.5520 (3) Å	µ = 0.10 mm⁻¹
c = 14.7699 (3) Å	T = 100 K
α = 68.752 (2)°	0.32 × 0.10 × 0.04 mm
β = 82.038 (2)°

Data collection top

Bruker APEXII CCD diffractometer	8280 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2009)	5112 reflections with I > 2σ(I)
T_min = 0.971, T_max = 0.996	R_int = 0.047
23090 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.056	0 restraints
wR(F²) = 0.155	H atoms treated by a mixture of independent and constrained refinement
S = 1.00	Δρ_max = 0.38 e Å⁻³
8280 reflections	Δρ_min = −0.28 e Å⁻³
359 parameters

Special details top

Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K.

Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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 > 2σ(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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
O1A	0.68689 (15)	−0.11656 (9)	0.22307 (8)	0.0266 (3)
O2A	0.61939 (14)	0.06247 (9)	0.20906 (8)	0.0243 (2)
O3A	0.85815 (16)	0.22440 (9)	0.12227 (8)	0.0255 (2)
C1A	0.9761 (2)	0.14446 (13)	0.10815 (11)	0.0204 (3)
C2A	1.1562 (2)	0.18050 (15)	0.05960 (12)	0.0290 (4)
H2AA	1.1918	0.2575	0.0369	0.035*
C3A	1.2811 (2)	0.10169 (17)	0.04530 (13)	0.0366 (4)
H3AA	1.4012	0.1260	0.0133	0.044*
C4A	1.2299 (2)	−0.01322 (16)	0.07799 (13)	0.0350 (4)
H4AA	1.3150	−0.0660	0.0684	0.042*
C5A	1.0506 (2)	−0.04874 (14)	0.12505 (12)	0.0263 (3)
H5AA	1.0156	−0.1257	0.1462	0.032*
C6A	0.9217 (2)	0.02859 (13)	0.14131 (10)	0.0198 (3)
C7A	0.7306 (2)	−0.01258 (12)	0.19453 (11)	0.0200 (3)
N1A	0.68931 (17)	0.46245 (11)	0.40308 (10)	0.0214 (3)
N2A	0.74130 (19)	0.65677 (12)	0.35534 (11)	0.0247 (3)
C8A	0.6621 (2)	0.57734 (14)	0.23833 (11)	0.0239 (3)
H8AA	0.6670	0.6489	0.1885	0.029*
C9A	0.6984 (2)	0.56827 (13)	0.33225 (11)	0.0207 (3)
C10A	0.6458 (2)	0.36749 (13)	0.38600 (12)	0.0243 (3)
H10A	0.6395	0.2966	0.4368	0.029*
C11A	0.6114 (2)	0.37414 (15)	0.29629 (13)	0.0281 (4)
H11A	0.5826	0.3084	0.2852	0.034*
C12A	0.6199 (2)	0.48242 (15)	0.21964 (12)	0.0257 (3)
C13A	0.5855 (2)	0.49005 (17)	0.11939 (13)	0.0338 (4)
H13A	0.6056	0.5677	0.0745	0.051*
H13B	0.4593	0.4655	0.1225	0.051*
H13C	0.6698	0.4417	0.0971	0.051*
O1B	0.24453 (15)	0.57634 (9)	0.41257 (8)	0.0228 (2)
O2B	0.17672 (15)	0.39175 (8)	0.45092 (8)	0.0239 (2)
O3B	0.08596 (16)	0.31742 (9)	0.32564 (9)	0.0257 (3)
C1B	0.10480 (19)	0.42674 (12)	0.26094 (11)	0.0192 (3)
C2B	0.0707 (2)	0.44786 (13)	0.16487 (12)	0.0223 (3)
H2BA	0.0358	0.3880	0.1471	0.027*
C3B	0.0891 (2)	0.55775 (13)	0.09701 (11)	0.0229 (3)
H3BA	0.0664	0.5716	0.0333	0.027*
C4B	0.1412 (2)	0.64860 (13)	0.12204 (11)	0.0234 (3)
H4BA	0.1538	0.7225	0.0755	0.028*
C5B	0.1739 (2)	0.62728 (13)	0.21704 (11)	0.0212 (3)
H5BA	0.2080	0.6878	0.2340	0.025*
C6B	0.15685 (19)	0.51694 (12)	0.28802 (11)	0.0174 (3)
C7B	0.19489 (19)	0.49451 (12)	0.39042 (11)	0.0183 (3)
N1B	0.26797 (18)	−0.00016 (10)	0.30554 (9)	0.0190 (3)
N2B	0.34027 (19)	−0.18896 (11)	0.33877 (10)	0.0242 (3)
C8B	0.0346 (2)	−0.14199 (13)	0.40050 (11)	0.0202 (3)
H8BA	−0.0036	−0.2186	0.4305	0.024*
C9B	0.2159 (2)	−0.11240 (12)	0.34789 (11)	0.0188 (3)
C10B	0.1505 (2)	0.08329 (12)	0.31225 (11)	0.0203 (3)
H10B	0.1904	0.1595	0.2817	0.024*
C11B	−0.0243 (2)	0.05709 (13)	0.36292 (11)	0.0218 (3)
H11B	−0.1028	0.1148	0.3680	0.026*
C12B	−0.0857 (2)	−0.05856 (13)	0.40769 (10)	0.0207 (3)
C13B	−0.2817 (2)	−0.08836 (15)	0.46052 (12)	0.0277 (4)
H13D	−0.2952	−0.1695	0.4954	0.042*
H13E	−0.3683	−0.0649	0.4138	0.042*
H13F	−0.3067	−0.0497	0.5061	0.042*
H1A3	0.743 (3)	0.1794 (19)	0.1574 (17)	0.061 (7)*
H1NA	0.719 (3)	0.4528 (17)	0.4688 (16)	0.049 (6)*
H2NA	0.748 (3)	0.7276 (17)	0.3090 (14)	0.035 (5)*
H1B3	0.111 (3)	0.327 (2)	0.3833 (18)	0.063 (7)*
H3NA	0.769 (3)	0.6423 (17)	0.4187 (16)	0.044 (6)*
H1NB	0.390 (3)	0.0191 (17)	0.2677 (14)	0.046 (6)*
H2NB	0.457 (3)	−0.1645 (16)	0.2974 (14)	0.039 (5)*
H3NB	0.302 (2)	−0.2656 (16)	0.3608 (13)	0.029 (5)*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
O1A	0.0262 (6)	0.0192 (5)	0.0306 (6)	−0.0005 (4)	−0.0029 (5)	−0.0047 (5)
O2A	0.0183 (5)	0.0199 (5)	0.0321 (6)	0.0006 (4)	−0.0010 (4)	−0.0071 (5)
O3A	0.0233 (6)	0.0201 (5)	0.0297 (6)	−0.0014 (4)	0.0001 (5)	−0.0061 (5)
C1A	0.0193 (7)	0.0240 (7)	0.0168 (7)	0.0010 (6)	−0.0036 (6)	−0.0057 (6)
C2A	0.0231 (8)	0.0311 (9)	0.0268 (9)	−0.0053 (7)	0.0022 (6)	−0.0052 (7)
C3A	0.0234 (8)	0.0492 (11)	0.0310 (10)	−0.0004 (8)	0.0051 (7)	−0.0104 (8)
C4A	0.0281 (9)	0.0431 (10)	0.0323 (10)	0.0099 (8)	0.0014 (7)	−0.0145 (8)
C5A	0.0272 (8)	0.0280 (8)	0.0239 (8)	0.0064 (6)	−0.0042 (6)	−0.0099 (7)
C6A	0.0192 (7)	0.0234 (7)	0.0162 (7)	0.0026 (6)	−0.0040 (5)	−0.0062 (6)
C7A	0.0208 (7)	0.0206 (7)	0.0176 (7)	0.0015 (6)	−0.0063 (6)	−0.0046 (6)
N1A	0.0196 (6)	0.0233 (6)	0.0208 (7)	0.0000 (5)	−0.0031 (5)	−0.0073 (5)
N2A	0.0277 (7)	0.0210 (7)	0.0242 (7)	0.0021 (5)	−0.0069 (6)	−0.0057 (6)
C8A	0.0165 (7)	0.0309 (8)	0.0208 (8)	0.0033 (6)	−0.0028 (6)	−0.0052 (6)
C9A	0.0137 (6)	0.0239 (7)	0.0227 (8)	0.0024 (5)	−0.0021 (6)	−0.0067 (6)
C10A	0.0216 (7)	0.0223 (7)	0.0279 (8)	−0.0023 (6)	−0.0024 (6)	−0.0079 (6)
C11A	0.0218 (8)	0.0332 (9)	0.0330 (9)	−0.0034 (7)	−0.0017 (7)	−0.0171 (7)
C12A	0.0136 (7)	0.0395 (9)	0.0255 (8)	0.0008 (6)	−0.0022 (6)	−0.0138 (7)
C13A	0.0239 (8)	0.0534 (11)	0.0275 (9)	−0.0020 (8)	−0.0040 (7)	−0.0185 (8)
O1B	0.0295 (6)	0.0175 (5)	0.0216 (6)	−0.0026 (4)	−0.0058 (4)	−0.0065 (4)
O2B	0.0298 (6)	0.0162 (5)	0.0225 (6)	−0.0027 (4)	−0.0036 (5)	−0.0030 (4)
O3B	0.0318 (6)	0.0153 (5)	0.0302 (6)	−0.0019 (4)	−0.0077 (5)	−0.0070 (5)
C1B	0.0150 (6)	0.0170 (7)	0.0252 (8)	0.0019 (5)	−0.0024 (6)	−0.0073 (6)
C2B	0.0196 (7)	0.0245 (7)	0.0280 (8)	0.0012 (6)	−0.0054 (6)	−0.0149 (7)
C3B	0.0193 (7)	0.0297 (8)	0.0222 (8)	0.0031 (6)	−0.0055 (6)	−0.0117 (7)
C4B	0.0238 (8)	0.0223 (7)	0.0218 (8)	0.0008 (6)	−0.0036 (6)	−0.0053 (6)
C5B	0.0226 (7)	0.0194 (7)	0.0225 (8)	−0.0010 (6)	−0.0032 (6)	−0.0087 (6)
C6B	0.0132 (6)	0.0180 (7)	0.0207 (7)	0.0000 (5)	−0.0024 (5)	−0.0067 (6)
C7B	0.0152 (7)	0.0174 (7)	0.0209 (7)	0.0010 (5)	−0.0016 (5)	−0.0058 (6)
N1B	0.0184 (6)	0.0159 (6)	0.0217 (6)	−0.0014 (5)	−0.0032 (5)	−0.0053 (5)
N2B	0.0221 (7)	0.0158 (6)	0.0330 (8)	−0.0004 (5)	−0.0030 (6)	−0.0071 (6)
C8B	0.0214 (7)	0.0181 (7)	0.0188 (7)	−0.0048 (6)	−0.0033 (6)	−0.0034 (6)
C9B	0.0216 (7)	0.0162 (7)	0.0185 (7)	−0.0001 (5)	−0.0066 (6)	−0.0048 (6)
C10B	0.0235 (7)	0.0160 (7)	0.0214 (7)	0.0010 (6)	−0.0067 (6)	−0.0056 (6)
C11B	0.0229 (8)	0.0229 (7)	0.0216 (8)	0.0035 (6)	−0.0066 (6)	−0.0093 (6)
C12B	0.0208 (7)	0.0264 (8)	0.0148 (7)	−0.0008 (6)	−0.0056 (6)	−0.0061 (6)
C13B	0.0202 (8)	0.0356 (9)	0.0251 (8)	−0.0018 (7)	−0.0020 (6)	−0.0087 (7)

Geometric parameters (Å, º) top

O1A—C7A	1.2500 (18)	O1B—C7B	1.2580 (17)
O2A—C7A	1.2843 (16)	O2B—C7B	1.2722 (17)
O3A—C1A	1.3591 (17)	O3B—C1B	1.3549 (18)
O3A—H1A3	0.99 (2)	O3B—H1B3	0.94 (2)
C1A—C2A	1.396 (2)	C1B—C2B	1.402 (2)
C1A—C6A	1.402 (2)	C1B—C6B	1.404 (2)
C2A—C3A	1.380 (2)	C2B—C3B	1.376 (2)
C2A—H2AA	0.9300	C2B—H2BA	0.9300
C3A—C4A	1.385 (3)	C3B—C4B	1.393 (2)
C3A—H3AA	0.9300	C3B—H3BA	0.9300
C4A—C5A	1.384 (2)	C4B—C5B	1.383 (2)
C4A—H4AA	0.9300	C4B—H4BA	0.9300
C5A—C6A	1.3933 (19)	C5B—C6B	1.397 (2)
C5A—H5AA	0.9300	C5B—H5BA	0.9300
C6A—C7A	1.495 (2)	C6B—C7B	1.499 (2)
N1A—C10A	1.356 (2)	N1B—C9B	1.3550 (18)
N1A—C9A	1.3566 (19)	N1B—C10B	1.3584 (18)
N1A—H1NA	0.99 (2)	N1B—H1NB	0.96 (2)
N2A—C9A	1.329 (2)	N2B—C9B	1.3331 (18)
N2A—H2NA	0.90 (2)	N2B—H2NB	0.96 (2)
N2A—H3NA	0.93 (2)	N2B—H3NB	0.930 (19)
C8A—C12A	1.366 (2)	C8B—C12B	1.373 (2)
C8A—C9A	1.411 (2)	C8B—C9B	1.412 (2)
C8A—H8AA	0.9300	C8B—H8BA	0.9300
C10A—C11A	1.355 (2)	C10B—C11B	1.359 (2)
C10A—H10A	0.9300	C10B—H10B	0.9300
C11A—C12A	1.415 (2)	C11B—C12B	1.411 (2)
C11A—H11A	0.9300	C11B—H11B	0.9300
C12A—C13A	1.504 (2)	C12B—C13B	1.506 (2)
C13A—H13A	0.9600	C13B—H13D	0.9600
C13A—H13B	0.9600	C13B—H13E	0.9600
C13A—H13C	0.9600	C13B—H13F	0.9600

C1A—O3A—H1A3	103.3 (12)	C1B—O3B—H1B3	101.2 (14)
O3A—C1A—C2A	118.13 (14)	O3B—C1B—C2B	117.87 (13)
O3A—C1A—C6A	121.82 (13)	O3B—C1B—C6B	121.75 (13)
C2A—C1A—C6A	120.05 (14)	C2B—C1B—C6B	120.38 (13)
C3A—C2A—C1A	119.90 (16)	C3B—C2B—C1B	119.53 (13)
C3A—C2A—H2AA	120.0	C3B—C2B—H2BA	120.2
C1A—C2A—H2AA	120.0	C1B—C2B—H2BA	120.2
C2A—C3A—C4A	120.78 (16)	C2B—C3B—C4B	121.15 (14)
C2A—C3A—H3AA	119.6	C2B—C3B—H3BA	119.4
C4A—C3A—H3AA	119.6	C4B—C3B—H3BA	119.4
C5A—C4A—C3A	119.30 (15)	C5B—C4B—C3B	119.05 (14)
C5A—C4A—H4AA	120.4	C5B—C4B—H4BA	120.5
C3A—C4A—H4AA	120.4	C3B—C4B—H4BA	120.5
C4A—C5A—C6A	121.29 (16)	C4B—C5B—C6B	121.54 (14)
C4A—C5A—H5AA	119.4	C4B—C5B—H5BA	119.2
C6A—C5A—H5AA	119.4	C6B—C5B—H5BA	119.2
C5A—C6A—C1A	118.66 (14)	C5B—C6B—C1B	118.36 (13)
C5A—C6A—C7A	120.15 (14)	C5B—C6B—C7B	121.13 (13)
C1A—C6A—C7A	121.18 (12)	C1B—C6B—C7B	120.50 (13)
O1A—C7A—O2A	123.35 (14)	O1B—C7B—O2B	123.09 (14)
O1A—C7A—C6A	119.44 (12)	O1B—C7B—C6B	119.41 (13)
O2A—C7A—C6A	117.21 (13)	O2B—C7B—C6B	117.49 (12)
C10A—N1A—C9A	122.06 (14)	C9B—N1B—C10B	121.76 (13)
C10A—N1A—H1NA	118.1 (12)	C9B—N1B—H1NB	117.6 (12)
C9A—N1A—H1NA	119.8 (12)	C10B—N1B—H1NB	120.6 (12)
C9A—N2A—H2NA	119.0 (12)	C9B—N2B—H2NB	120.4 (11)
C9A—N2A—H3NA	118.2 (12)	C9B—N2B—H3NB	119.0 (11)
H2NA—N2A—H3NA	122.8 (17)	H2NB—N2B—H3NB	119.2 (16)
C12A—C8A—C9A	120.89 (15)	C12B—C8B—C9B	120.48 (13)
C12A—C8A—H8AA	119.6	C12B—C8B—H8BA	119.8
C9A—C8A—H8AA	119.6	C9B—C8B—H8BA	119.8
N2A—C9A—N1A	118.14 (14)	N2B—C9B—N1B	117.99 (13)
N2A—C9A—C8A	124.06 (15)	N2B—C9B—C8B	123.61 (13)
N1A—C9A—C8A	117.80 (14)	N1B—C9B—C8B	118.39 (13)
C11A—C10A—N1A	121.14 (15)	N1B—C10B—C11B	121.03 (14)
C11A—C10A—H10A	119.4	N1B—C10B—H10B	119.5
N1A—C10A—H10A	119.4	C11B—C10B—H10B	119.5
C10A—C11A—C12A	119.10 (15)	C10B—C11B—C12B	119.38 (13)
C10A—C11A—H11A	120.4	C10B—C11B—H11B	120.3
C12A—C11A—H11A	120.4	C12B—C11B—H11B	120.3
C8A—C12A—C11A	119.01 (15)	C8B—C12B—C11B	118.95 (13)
C8A—C12A—C13A	121.66 (16)	C8B—C12B—C13B	121.20 (14)
C11A—C12A—C13A	119.33 (15)	C11B—C12B—C13B	119.84 (13)
C12A—C13A—H13A	109.5	C12B—C13B—H13D	109.5
C12A—C13A—H13B	109.5	C12B—C13B—H13E	109.5
H13A—C13A—H13B	109.5	H13D—C13B—H13E	109.5
C12A—C13A—H13C	109.5	C12B—C13B—H13F	109.5
H13A—C13A—H13C	109.5	H13D—C13B—H13F	109.5
H13B—C13A—H13C	109.5	H13E—C13B—H13F	109.5

O3A—C1A—C2A—C3A	178.90 (15)	O3B—C1B—C2B—C3B	−179.74 (13)
C6A—C1A—C2A—C3A	−0.7 (2)	C6B—C1B—C2B—C3B	0.2 (2)
C1A—C2A—C3A—C4A	0.5 (3)	C1B—C2B—C3B—C4B	0.0 (2)
C2A—C3A—C4A—C5A	0.3 (3)	C2B—C3B—C4B—C5B	−0.3 (2)
C3A—C4A—C5A—C6A	−0.9 (3)	C3B—C4B—C5B—C6B	0.4 (2)
C4A—C5A—C6A—C1A	0.6 (2)	C4B—C5B—C6B—C1B	−0.1 (2)
C4A—C5A—C6A—C7A	−178.47 (15)	C4B—C5B—C6B—C7B	179.23 (13)
O3A—C1A—C6A—C5A	−179.39 (14)	O3B—C1B—C6B—C5B	179.82 (13)
C2A—C1A—C6A—C5A	0.2 (2)	C2B—C1B—C6B—C5B	−0.1 (2)
O3A—C1A—C6A—C7A	−0.4 (2)	O3B—C1B—C6B—C7B	0.4 (2)
C2A—C1A—C6A—C7A	179.26 (14)	C2B—C1B—C6B—C7B	−179.52 (12)
C5A—C6A—C7A—O1A	−1.0 (2)	C5B—C6B—C7B—O1B	−0.6 (2)
C1A—C6A—C7A—O1A	−179.99 (14)	C1B—C6B—C7B—O1B	178.75 (13)
C5A—C6A—C7A—O2A	178.56 (14)	C5B—C6B—C7B—O2B	−179.89 (13)
C1A—C6A—C7A—O2A	−0.5 (2)	C1B—C6B—C7B—O2B	−0.52 (19)
C10A—N1A—C9A—N2A	179.75 (14)	C10B—N1B—C9B—N2B	−179.26 (13)
C10A—N1A—C9A—C8A	−0.5 (2)	C10B—N1B—C9B—C8B	−0.3 (2)
C12A—C8A—C9A—N2A	179.56 (14)	C12B—C8B—C9B—N2B	179.36 (14)
C12A—C8A—C9A—N1A	−0.2 (2)	C12B—C8B—C9B—N1B	0.4 (2)
C9A—N1A—C10A—C11A	0.8 (2)	C9B—N1B—C10B—C11B	0.7 (2)
N1A—C10A—C11A—C12A	−0.5 (2)	N1B—C10B—C11B—C12B	−1.2 (2)
C9A—C8A—C12A—C11A	0.5 (2)	C9B—C8B—C12B—C11B	−0.9 (2)
C9A—C8A—C12A—C13A	−178.45 (14)	C9B—C8B—C12B—C13B	177.87 (14)
C10A—C11A—C12A—C8A	−0.2 (2)	C10B—C11B—C12B—C8B	1.3 (2)
C10A—C11A—C12A—C13A	178.81 (14)	C10B—C11B—C12B—C13B	−177.53 (14)

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O3A—H1A3···O2A	0.99 (2)	1.61 (2)	2.5310 (16)	154 (2)
N1A—H1NA···O1Bⁱ	0.99 (2)	1.71 (2)	2.6965 (17)	174 (2)
N2A—H2NA···O1Aⁱⁱ	0.90 (2)	1.99 (2)	2.8645 (19)	164 (2)
O3B—H1B3···O2B	0.94 (3)	1.62 (3)	2.5179 (16)	158 (2)
N2A—H3NA···O2Bⁱ	0.94 (2)	1.91 (2)	2.8468 (18)	178 (2)
N1B—H1NB···O2A	0.96 (2)	1.76 (2)	2.7186 (17)	172.7 (17)
N2B—H2NB···O1A	0.96 (2)	1.84 (2)	2.7976 (18)	177.0 (16)
N2B—H3NB···O1Bⁱⁱⁱ	0.93 (2)	1.88 (2)	2.8097 (19)	174.3 (13)
C8B—H8BA···O2B^iv	0.93	2.47	3.357 (2)	159
C10B—H10B···O3B	0.93	2.38	3.039 (2)	128

Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x, y+1, z; (iii) x, y−1, z; (iv) −x, −y, −z+1.

Experimental details

Crystal data
Chemical formula	C₆H₉N₂⁺·C₇H₅O₃⁻
M_r	246.26
Crystal system, space group	Triclinic, P1
Temperature (K)	100
a, b, c (Å)	7.2417 (2), 12.5520 (3), 14.7699 (3)
α, β, γ (°)	68.752 (2), 82.038 (2), 88.824 (2)
V (Å³)	1238.58 (5)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	0.10
Crystal size (mm)	0.32 × 0.10 × 0.04

Data collection
Diffractometer	Bruker APEXII CCD
Absorption correction	Multi-scan (SADABS; Bruker, 2009)
T_min, T_max	0.971, 0.996
No. of measured, independent and observed [I > 2σ(I)] reflections	23090, 8280, 5112
R_int	0.047
(sin θ/λ)_max (Å⁻¹)	0.737

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.056, 0.155, 1.00
No. of reflections	8280
No. of parameters	359
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	0.38, −0.28

Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O3A—H1A3···O2A	0.99 (2)	1.61 (2)	2.5310 (16)	154 (2)
N1A—H1NA···O1Bⁱ	0.99 (2)	1.71 (2)	2.6965 (17)	174 (2)
N2A—H2NA···O1Aⁱⁱ	0.90 (2)	1.99 (2)	2.8645 (19)	164 (2)
O3B—H1B3···O2B	0.94 (3)	1.62 (3)	2.5179 (16)	158 (2)
N2A—H3NA···O2Bⁱ	0.94 (2)	1.91 (2)	2.8468 (18)	178 (2)
N1B—H1NB···O2A	0.96 (2)	1.76 (2)	2.7186 (17)	172.7 (17)
N2B—H2NB···O1A	0.96 (2)	1.84 (2)	2.7976 (18)	177.0 (16)
N2B—H3NB···O1Bⁱⁱⁱ	0.93 (2)	1.88 (2)	2.8097 (19)	174.3 (13)
C8B—H8BA···O2B^iv	0.93	2.47	3.357 (2)	159
C10B—H10B···O3B	0.93	2.38	3.039 (2)	128

Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x, y+1, z; (iii) x, y−1, z; (iv) −x, −y, −z+1.

Footnotes

‡Thomson Reuters ResearcherID: A-3561-2009.

Acknowledgements

MH and HKF thank the Malaysian Government and Universiti Sains Malaysia for the Research University Golden Goose grant No. 1001/PFIZIK/811012. MH also thanks Universiti Sains Malaysia for a post-doctoral research fellowship.

References

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