Electrochemically and photochemically active palladium(II) heterotopic metallacalix[3]arenes

The cyclic trinuclear system, [(en)(3)Pd-3(4,7-phen)(3)](6+), undergoes a ligand exchange reaction with 5-R-2-hydroxypyrimidine derivatives (HRpymo; R = ethynylferrocene, 5-(dimethylamino)-N-(2-propynyl)-1-naphthalene sulfonamide) to give [(en)(3)Pd-3(4,7-phen)(2) (Rpymo)](5+), functional supramolecular receptors of mononucleotides.