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The complexation of terpyridine (tpy) and its 4Ј-ethynyl (E) and 4Ј-(2-thienyl) (T) derivatives, as promising chelate end groups for oligomeric components of conjugated metallosupramolecular polymers, with Zn 2+ and Fe 2+ ions as ion couplers was investigated in acetonitrile using NMR and UV/ Vis spectroscopy. The binding of these ligands with Zn 2+ ions shows two distinct steps with comparable binding constants in the range of 10 6 dm 3 mol -1 , whereas their binding with Fe 2+ ions shows a strong tendency to form [FeL 2 ] 2+ species, which almost do not dissociate to monoligand species [FeL] 2+ even at a twofold excess of Fe 2+ ions. The ligand exchange Figure 1. General structure of an MSP.[a]

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