Table 5. Experimental details.

Crystal data
Chemical formula	[Ni(C7H9NO)2(H2O)2](NO3)2
M r	465.05
Crystal system, space group	Triclinic, P
Temperature (K)	293
a, b, c (Å)	7.782 (5), 8.185 (5), 8.811 (5)
α, β, γ (°)	96.785 (5), 113.856 (5), 109.140 (5)
V (Å3)	464.0 (5)
Z	1
Radiation type	Mo Kα
μ (mm−1)	1.11
Crystal size (mm)	0.18 × 0.11 × 0.08
Data collection
Diffractometer	Bruker APEXII
No. of measured, independent and observed [I > 2σ(I)] reflections	2478, 2478, 2471
R int	0.019
(sin θ/λ)max (Å−1)	0.685
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.018, 0.051, 1.08
No. of reflections	2478
No. of parameters	133
No. of restraints	4
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)	0.42, −0.29

Computer programs: APEX2 and SAINT (Bruker, 2006 ▸), SIR2002 (Burla et al., 2003 ▸), SHELXL (Sheldrick, 2015 ▸), ORTEPIII (Burnett & Johnson, 1996 ▸), ORTEP-3 for Windows and WinGX (Farrugia, 2012 ▸), PLATON (Spek, 2009 ▸) and Mercury (Macrae et al., 2006 ▸).