Table 1. Experimental details.

	(1)	(2)	(3)
Crystal data
Chemical formula	C16H11N3	C17H13N3	C18H16N3 +·I−
M r	245.28	259.30	401.24
Crystal system, space group	Monoclinic, P21/c	Monoclinic, P21/c	Monoclinic, P21/n
Temperature (K)	100	100	230
a, b, c (Å)	13.5479 (5), 5.0242 (2), 17.3881 (7)	7.5095 (2), 12.1216 (3), 13.5616 (4)	9.8821 (2), 9.7125 (2), 17.9839 (4)
β (°)	101.382 (2)	92.547 (1)	103.676 (1)
V (Å3)	1160.28 (8)	1233.25 (6)	1677.15 (6)
Z	4	4	4
Radiation type	Mo Kα	Mo Kα	Mo Kα
μ (mm−1)	0.09	0.09	1.91
Crystal size (mm)	0.42 × 0.1 × 0.08	0.34 × 0.12 × 0.11	0.32 × 0.18 × 0.13
Data collection
Diffractometer	Bruker D8 Venture	Bruker D8 Venture	Bruker SMART APEXII
Absorption correction	Multi-scan (SADABS; Krause et al., 2015 ▸)	Multi-scan (SADABS; Krause et al., 2015 ▸)	Multi-scan (SADABS; Krause et al., 2015 ▸)
T min, T max	0.684, 0.746	0.685, 0.746	0.668, 0.746
No. of measured, independent and observed [I > 2σ(I)] reflections	16322, 2866, 2405	14029, 3280, 2803	28389, 4146, 3700
R int	0.036	0.035	0.026
(sin θ/λ)max (Å−1)	0.667	0.682	0.668
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.057, 0.140, 1.05	0.060, 0.146, 1.04	0.028, 0.067, 1.06
No. of reflections	2866	3280	4146
No. of parameters	216	233	201
H-atom treatment	All H-atom parameters refined	All H-atom parameters refined	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	0.39, −0.33	0.45, −0.34	0.72, −0.46

Computer programs: APEX3 and SAINT (Bruker, 2017 ▸), SHELXT (Sheldrick, 2015a ▸), SHELXL (Sheldrick, 2015b ▸), OLEX2 (Dolomanov et al., 2009 ▸) and publCIF (Westrip, 2010 ▸).