Table 1. Born Radii (σ_i) of the Charged Species Considered in the Charge Screening Model^a.

species i	σi (Å)
Host4+ (1)	6.50
Na+	1.94
F–	1.48
Cl–	2.02
Br–	2.12
I–	2.36
Host4+ (1)·F–	6.53
Host4+ (1)·Cl–	6.56
Host4+ (1).Br–	6.57
Host4+ (1)·I–	6.60

^aA Born radius for host 1 (Host⁴⁺) of 6.5 Å was assumed. The Born radii of the host–guest complexes were calculated following eq 8.