Table 1. Summary of models.

Formula	[PPh4][UF6]
Temperature	20.0 (1) K
Spherical atom model R indices Δρ (max and min)	I > 2σ(I) R 1 = 0.0082, wR 2 all data = 0.0181, 1.291 and −1.300 e Å−3
Multipole model	1a † 78 e FC: 1s to 5d	1b 60 e FC: 1s to 4f	1c 28 e FC: 1s to 3d
Valence pseudo-atoms	6s, 6p, 5f, 6d, 7s	5s + 5p, 5d, 6s + 6p, 5f, 6d, 7s	4s to 4f, 5s to 5d, 6s + 6p, 5f, 6d, 7s
Final R indices: R 1 I > 3σ(I) wR2 all data	R 1 = 0.0066, wR 2 = 0.0095	R 1 = 0.0066, wR 2 = 0.0093	R 1 = 0.0065, wR 2 = 0.0084
Δρ (max and min) sin θ/λ < 1.0 Å−1	0.295 and −0.561 e Å−3	0.319 and −0.588 e Å−3	0.298 and −0.519 e Å−3

^†Gianopoulos et al., 2017b ▸.