(I)	(II)	(III)
Crystal data
Chemical formula	[Fe(C10H8N2)3](C8H3N4O)2·0.776H2O	[Fe(C10H8N2)3](C10H7N4S)(ClO4)	[Fe(C12H12N2)3](C8H3N4O)(BF4)·0.926C2H2O
M r	880.65	839.11	909.18
Crystal system, space group	Monoclinic, C2/c	Monoclinic, P21/n	Monoclinic, P21/n
Temperature (K)	100	100	100
a, b, c (Å)	38.3410 (3), 11.2756 (1), 19.33740 (16)	11.6644 (3), 23.1692 (4), 13.9599 (3)	11.6979 (4), 25.7716 (7), 14.1055 (4)
α, β, γ (°)	90, 97.503 (1), 90	90, 97.202 (2), 90	90, 100.444 (3), 90
V (Å3)	8288.32 (12)	3742.96 (14)	4182.0 (2)
Z	8	4	4
Radiation type	Cu Kα	Mo Kα	Mo Kα
μ (mm−1)	3.42	0.59	0.43
Crystal size (mm)	0.15 × 0.05 × 0.02	0.24 × 0.22 × 0.17	0.29 × 0.24 × 0.20
Data collection
Diffractometer	Rigaku XtaLAB Synergy-S	Rigaku SuperNova, Single source at offset, Eos	Rigaku SuperNova, Single source at offset, Eos
Absorption correction	Multi-scan (CrysAlis PRO; Rigaku OD, 2015 ▸)	Multi-scan (CrysAlis PRO; Rigaku OD, 2015 ▸)	Multi-scan (CrysAlis PRO; Rigaku OD, 2015 ▸)
T min, T max	0.845, 0.934	0.724, 0.905	0.540, 0.917
No. of measured, independent and observed [I > 2σ(I)] reflections	26027, 7579, 6565	30922, 8586, 5903	32301, 8711, 5956
R int	0.042	0.056	0.090
(sin θ/λ)max (Å−1)	0.602	0.667	0.629
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.033, 0.081, 1.05	0.059, 0.170, 1.05	0.062, 0.123, 1.05
No. of reflections	7579	8586	8711
No. of parameters	694	721	627
No. of restraints	560	151	10
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement	H-atom parameters constrained	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	0.22, −0.38	2.23, −0.42	0.46, −0.50