Ruthenium Ammine/Crown Ether Interactions in Solution: Effects of Modification of both Guest and Host on the Strength of Second-Sphere Complexation

Matthew D. Todd, Yuhua Dong, Jennifer Horney, Dong I. Yoon, Joseph T. Hupp

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Charge-transfer absorption, electrochemical, and NMR-NOE studies of monomeric and dimeric (ligand-bridged) ruthenium ammine guest interactions with several crown ether hosts show that second-sphere complexation is prevalent in nitromethane as solvent and that complexation or binding constants can be varied by ca. 108-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. dicyclohexano vs dibenzo crowns). For guests, larger binding constants are observed in higher oxidation states and in the presence of strongly electron-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 (apparently) benzene(crown) → Ru(III) charge-transfer (donor/acceptor) interactions.

Original languageEnglish
Pages (from-to)2001-2004
Number of pages4
JournalInorganic Chemistry
Issue number10
Publication statusPublished - Jan 1 1993


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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