Table 2. Experimental details.

Crystal data
Chemical formula	C6H10N3O+·C7H4ClO2 −
M r	295.72
Crystal system, space group	Monoclinic, P21/c
Temperature (K)	296
a, b, c (Å)	10.1148 (8), 11.2236 (8), 14.579 (1)
β (°)	120.940 (5)
V (Å3)	1419.57 (19)
Z	4
Radiation type	Mo Kα
μ (mm−1)	0.28
Crystal size (mm)	0.35 × 0.30 × 0.20
Data collection
Diffractometer	Bruker Kappa APEXII CCD
Absorption correction	Multi-scan (SADABS; Bruker, 2004 ▸)
T min, T max	0.909, 0.946
No. of measured, independent and observed [I > 2σ(I)] reflections	10962, 3423, 2125
R int	0.024
(sin θ/λ)max (Å−1)	0.669
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.047, 0.152, 0.99
No. of reflections	3423
No. of parameters	188
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)	0.26, −0.35

Computer programs: APEX2, SAINT and XPREP (Bruker, 2004 ▸), SIR92 (Altomare et al., 1999 ▸), SHELXL2017 (Sheldrick, 2015 ▸), ORTEP-3 (Farrugia, 2012 ▸) and Mercury (Macrae et al., 2008 ▸).