Abstract
Adduct formation was spectrophotometrically and electrochemically investigated for monoammine-, diammine-, triammine- and tetraamineruthenium(II) complexes. It was found that an adduct was formed through hydrogen bonding between the coordinating ammonia ligands to the ruthenium(II) and the ether oxygens of 18-crown-6 ether. The stoichiometry of adduct formation was determined to be a 1:1 ratio of complex to 18-crown-6 ether. The electrochemical results offer the evidence that the increased electron density around the metal center by formation of the hydrogen bond is redistributed over the whole complex through pπ-dπ back donation. The electrochemical behavior in the presence of 18-crown-6 ether revealed the concurrent electrode reactions for the ruthenium(II)-ammine complexes with fewer ammine ligands.
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