Table 3. Experimental details.

	(I)	(II)
Crystal data
Chemical formula	C6H3ClN2	C6H3ClN2
M r	138.55	138.55
Crystal system, space group	Monoclinic, P21/n	Monoclinic, P21/n
Temperature (K)	125	125
a, b, c (Å)	3.813 (5), 14.047 (19), 11.356 (15)	6.1739 (15), 15.238 (4), 7.0123 (18)
β (°)	96.806 (19)	112.492 (4)
V (Å3)	604.0 (14)	609.5 (3)
Z	4	4
Radiation type	Mo Kα	Mo Kα
μ (mm−1)	0.52	0.52
Crystal size (mm)	0.25 × 0.10 × 0.04	0.20 × 0.15 × 0.03
Data collection
Diffractometer	Bruker APEXII CCD	Bruker APEXII CCD
Absorption correction	Multi-scan (SADABS; Bruker, 2013 ▸)	Multi-scan (SADABS; Bruker, 2013 ▸)
T min, T max	0.67, 0.98	0.82, 0.98
No. of measured, independent and observed [I > 2σ(I)] reflections	12191, 1852, 1498	15460, 1868, 1657
R int	0.063	0.031
(sin θ/λ)max (Å−1)	0.715	0.717
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.050, 0.135, 1.12	0.028, 0.082, 1.09
No. of reflections	1852	1868
No. of parameters	82	82
H-atom treatment	H-atom parameters constrained	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	0.53, −0.37	0.48, −0.19

Computer programs: APEX2 and SAINT (Bruker, 2013 ▸), SHELXS2014 and SHELXTL2014 (Sheldrick, 2008 ▸), SHELXL2014 (Sheldrick, 2015 ▸), OLEX2 (Dolomanov et al., 2009 ▸) and Mercury (Macrae et al., 2008 ▸).