| Crystal data | 
| Chemical formula | 
{[Ni(C10H8N2)(H2O)4](C6H3ClNO2)2·4H2O}n
 | 
| 
M
r
 | 
672.11 | 
| Crystal system, space group | 
Monoclinic, P21/n
 | 
| Temperature (K) | 
296 | 
| 
a, b, c (Å) | 
10.7997 (3), 11.2319 (2), 12.0225 (3) | 
| β (°) | 
95.184 (2) | 
| 
V (Å3) | 
1452.38 (6) | 
| 
Z
 | 
2 | 
| Radiation type | 
Mo Kα | 
| μ (mm−1) | 
0.92 | 
| Crystal size (mm) | 
0.24 × 0.18 × 0.16 | 
|   | 
| Data collection | 
| Diffractometer | 
Oxford Diffraction Xcalibur2 diffractometer with Sapphire 3 CCD detector | 
| Absorption correction | 
Multi-scan (CrysAlis PRO; Rigaku OD, 2018 ▸) | 
| 
T
min, T
max
 | 
0.927, 1.000 | 
| No. of measured, independent and observed [I > 2σ(I)] reflections | 
11778, 2541, 2144 | 
| 
R
int
 | 
0.025 | 
| (sin θ/λ)max (Å−1) | 
0.595 | 
|   | 
| Refinement | 
| 
R[F
2 > 2σ(F
2)], wR(F
2), S
 | 
0.029, 0.074, 1.07 | 
| No. of reflections | 
2541 | 
| No. of parameters | 
211 | 
| No. of restraints | 
12 | 
| H-atom treatment | 
H atoms treated by a mixture of independent and constrained refinement | 
| Δρmax, Δρmin (e Å−3) | 
0.23, −0.23 |