Table 3. Experimental details.

	I	II
Crystal data
Chemical formula	C13H10N2O	C13H10N2O
M r	210.23	210.23
Crystal system, space group	Monoclinic, C2/c	Orthorhombic, P b c a
Temperature (K)	193	193
a, b, c (Å)	18.0187 (9), 6.4455 (3), 18.7315 (10)	13.7925 (3), 7.2652 (1), 19.7956 (4)
α, β, γ (°)	90, 111.181 (3), 90	90, 90, 90
V (Å3)	2028.50 (18)	1983.62 (6)
Z	8	8
Radiation type	Mo Kα	Mo Kα
μ (mm−1)	0.09	0.09
Crystal size (mm)	0.51 × 0.23 × 0.14	0.37 × 0.33 × 0.19
Data collection
Diffractometer	Bruker APEXII CCD	Bruker APEXII CCD
Absorption correction	Multi-scan (SADABS; Krause et al., 2015 ▸)	Multi-scan (SADABS; Krause et al., 2015 ▸)
T min, T max	0.699, 0.746	0.712, 0.746
No. of measured, independent and observed [I > 2σ(I)] reflections	9328, 2350, 1956	34068, 2479, 2203
R int	0.031	0.036
(sin θ/λ)max (Å−1)	0.651	0.668
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.041, 0.104, 1.07	0.039, 0.099, 1.02
No. of reflections	2350	2479
No. of parameters	145	145
H-atom treatment	H-atom parameters constrained	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	0.18, −0.23	0.25, −0.38

Computer programs: APEX2 and SAINT (Bruker, 2012 ▸), SHELXT (Sheldrick, 2015a ▸), SHELXL (Sheldrick, 2015b ▸) and OLEX2 (Dolomanov et al., 2009 ▸).