Heteronuclear Ru^IIAg^I Complexes Having a Pyrroloquinolinequinone Derivative as a Bridging Ligand

Abstract

Herein, we report the synthesis of a novel heterohexanuclear complex (<b>1</b>) of a heteroaromatic cofactor, pyrroloquinolinequinone (PQQ). The crystal structure of <b>1</b> was determined to reveal that two PQQ-bridged Ru^IIAg^I units were linked by two [Ag^I(OTf)₂]⁻ units (OTf = CF₃SO₃^–). A solvent-bound Ru^IIAg^I heterodinuclear complex (<b>2</b>) was formed from <b>1</b> in a coordinating solvent such as acetone to show an intense metal-to-ligand charge-transfer band at 709 nm