Table 3. Experimental details.

Crystal data
Chemical formula	[Ni(C10H24N2O4)(C4H4O4)]·4H2O
M r	483.16
Crystal system, space group	Monoclinic, P21/c
Temperature (K)	296
a, b, c (Å)	10.1369 (6), 10.8182 (5), 19.7771 (12)
β (°)	90.172 (5)
V (Å3)	2168.8 (2)
Z	4
Radiation type	Mo Kα
μ (mm−1)	0.96
Crystal size (mm)	0.64 × 0.53 × 0.42
Data collection
Diffractometer	Stoe IPDS 2
Absorption correction	Integration (X-RED32; Stoe & Cie, 2002 ▸)
T min, T max	0.605, 0.735
No. of measured, independent and observed [I > 2σ(I)] reflections	11333, 4472, 3581
R int	0.050
(sin θ/λ)max (Å−1)	0.628
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.041, 0.113, 1.06
No. of reflections	4472
No. of parameters	283
No. of restraints	14
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)	0.53, −0.43

Computer programs: X-AREA and X-RED (Stoe & Cie, 2002 ▸), SHELXT2014 (Sheldrick, 2015a ▸), SHELXL2018 (Sheldrick, 2015b ▸), ORTEP-3 for Windows and WinGX (Farrugia, 2012 ▸) and PLATON (Spek, 2009 ▸).