Table 2. Experimental details.

Crystal data
Chemical formula	C9H17N2O+·Cl−·C9H16N2O
M r	372.93
Crystal system, space group	Monoclinic, C2/c
Temperature (K)	90
a, b, c (Å)	20.2125 (8), 9.6926 (4), 10.1458 (3)
β (°)	100.445 (1)
V (Å3)	1954.74 (13)
Z	4
Radiation type	Mo Kα
μ (mm−1)	0.22
Crystal size (mm)	0.40 × 0.36 × 0.04
Data collection
Diffractometer	Bruker D8 Venture dual source
Absorption correction	Multi-scan (SADABS; Krause et al., 2015 ▸)
T min, T max	0.885, 0.988
No. of measured, independent and observed [I > 2σ(I)] reflections	31903, 2235, 2096
R int	0.032
(sin θ/λ)max (Å−1)	0.649
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.037, 0.096, 1.12
No. of reflections	2235
No. of parameters	144
No. of restraints	82
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)	0.67, −0.22

Computer programs: APEX3 (Bruker, 2016 ▸), SHELXT (Sheldrick, 2015a ▸), SHELXL2018/3 (Sheldrick, 2015b ▸), XP in SHELXTL and SHELX (Sheldrick, 2008 ▸), CIFFIX (Parkin, 2013 ▸) and PLATON (Spek, 2009 ▸).