Table 2. Experimental details.

Crystal data
Chemical formula	C10H9N2O+·Br−·H2O
M r	271.12
Crystal system, space group	Monoclinic, P21/c
Temperature (K)	133
a, b, c (Å)	5.7882 (1), 9.2095 (2), 20.2485 (4)
β (°)	91.701 (1)
V (Å3)	1078.90 (4)
Z	4
Radiation type	Mo Kα
μ (mm−1)	3.79
Crystal size (mm)	0.05 × 0.04 × 0.03
Data collection
Diffractometer	Nonius KappaCCD
Absorption correction	Multi-scan (SADABS; Sheldrick, 2002 ▸)
T min, T max	0.557, 0.746
No. of measured, independent and observed [I > 2σ(I)] reflections	12419, 2465, 2226
R int	0.030
(sin θ/λ)max (Å−1)	0.649
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.023, 0.052, 1.07
No. of reflections	2465
No. of parameters	190
No. of restraints	32
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)	0.46, −0.51

Computer programs: COLLECT (Nonius, 1998 ▸), DENZO (Otwinowski & Minor, 1997 ▸), SHELXS97 (Sheldrick, 2008), SHELXL2018 (Sheldrick, 2015 ▸), ORTEP-3 for Windows (Farrugia, 2012 ▸) and Mercury (Macrae et al., 2006 ▸).