RUTHENIUM AMMINE CROWN-ETHER INTERACTIONS IN SOLUTION - EFFECTS OF MODIFICATION OF BOTH GUEST AND HOST ON THE STRENGTH OF 2ND-SPHERE COMPLEXATION

Charge-transfer absorption, electrochemical, and NMR-NOE studies of mo nomeric and dimeric (ligand-bridged) ruthenium ammine guest interactio ns with several crown ether hosts show that second-sphere complexation is prevalent in nitromethane as solvent and that complexation or bind ing constants can be varied by ca. 10(8)-fold by modifying both guest and host properties. For hosts, larger binding constants are obtained with larger macrocycles and with more flexible macrocycles (i.e. dicyc lohexano vs dibenzo crowns). For guests, larger binding constants are observed in higher oxidation states and in the presence of strongly el ectron-withdrawing ancillary ligands. In all cases, binding appears to be driven primarily by ammine hydrogen/ether oxygen (Lewis acid/base) interactions. Evidence is also found, however, for contributions from favorable benzene(crown)/pyridine(complex) interactions and (apparent ly) benzene(crown) --> Ru(III) charge-transfer (donor/acceptor) intera ctions.