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Adduct formation between a ruthenium complex with protic ligands of different types, [Ru(NH3)5(qdiH)](PF6)3 (qdi=1,4-quinonediimine), and crown ethers with different flexibilities has been investigated by absorption and 1H NMR spectroscopies and cyclic voltammetry. This adduct formation is rationalized in terms of hydrogen bonding of the crown ether to both protic-ligand sites of the complex. A greater...