*E-mail: Gabriel.Canard@univ-amu.fr (GC), Claude.Piguet@unige.ch (CP). ... Tunable interstrand interactions combined with size-dependent effective molarities are exploited for the selective complexation of different lanthanide cations in binuclear podates. ... This work illustrates a simple approach for deciphering and exploiting the various free energy contributions to the global complexation process leading to the binuclear triple-stranded podates [Ln 2 (L9)] 6+ (Ln is a trivalent ...