. 2011 Aug 25;512(4-6):139–145. doi: 10.1016/j.cplett.2011.05.060

Table 1.

Structural parameters of hydrated trivalent metal cations, $r_{1}$ and $r_{2}$ are the mean distances of first and second hydration shell, $N_{1}$ and $N_{2}$ , the (average) number of ligands in these shells.

Ion	$r_{1}$ (Å)	$r_{2}$ (Å)	$N_{1}$	$N_{2}$	Ref.
Al(III)	1.90	4.1	6	11.8	[37]
Sb(III)	2.18/2.70	4.3	4 + 4	8 + 5	[38]
Fe(III)	2.03	4.1	6	13.6	[39]
V(III)	2.03	4.3	6	13.5	[40]
Ir(III)	2.06	4.2	6	13,5	[41]
La(III)	2.62	4.8	9.5	25.0	[42]
Ce(III)	2.63	5.0	9	24.2	[42]