Revised radii of the univalent Cu, Ag, Au and Tl cations.

Radii of Cu, Ag, Au and Tl cations are determined by the additive method from interatomic distances in molecular and/or crystalline halides, oxides, chalcogenides and cyanides with different coordinations of atoms, and then recalculated for the 6-coordination number. The averaged (from 74 structures) values of revised radii are equal to r(Cu) = 0.74 Å, r(Ag) = 0.99 Å, r(Au) = 0.92 Å, r(Tl) = 1.22 Å, which are consistent with radii calculated from direct cation-cation contacts in ultimately compressed metals.