Table 3. Experimental details.

Crystal data
Chemical formula	[Ni(C16H13ClN2O3)(C3H4N2)]
M r	443.52
Crystal system, space group	Tetragonal, I41/a
Temperature (K)	295
a, c (Å)	30.879 (4), 8.0750 (16)
V (Å3)	7700 (3)
Z	16
Radiation type	Mo Kα
μ (mm−1)	1.18
Crystal size (mm)	0.35 × 0.25 × 0.16
Data collection
Diffractometer	Bruker APEXII CCD area detector
Absorption correction	Multi-scan (SADABS; Bruker, 2003 ▸)
T min, T max	0.735, 0.860
No. of measured, independent and observed [I > 2σ(I)] reflections	23938, 4924, 3431
R int	0.038
(sin θ/λ)max (Å−1)	0.678
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.038, 0.106, 1.00
No. of reflections	4924
No. of parameters	259
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)	0.79, −0.21

Computer programs: APEX2 and SAINT (Bruker, 2003 ▸), SHELXT (Sheldrick, 2015a ▸), SHELXL (Sheldrick, 2015b ▸) and OLEX2 (Dolomanov et al., 2009 ▸).