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Updated: Feb 11, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Controlling Second Coordination Sphere Effects in Luminescent Ruthenium Complexes by Means of External Pressure
Andrea Pannwitz1, Stéphanie Poirier2, Nicolas Bélanger-Desmarais2
1Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland.
Abstract:
Two luminescent heteroleptic RuII complexes with a 2,2'-biimidazole (biimH2 ) ligand form doubly hydrogen-bonded salt bridges to 4-sulfobenzoate anions in single crystals. The structure of one of these cation-anion adducts shows that the biimH2 ligand is deprotonated. Its 3 MLCT luminescence band does not shift significantly under the influence of an external hydrostatic pressure, a behavior typical for these electronic transitions. In contrast, hydrostatic pressure on the other crystalline cation-anion adduct induces a shift of proton density from the peripheral N-H groups of biimH2 towards benzoate, leading to a pronounced redshift of the 3 MLCT luminescence band. Such a significant and pressure-tunable influence from an interaction in the second coordination sphere is unprecedented in artificial small-molecule-based systems.
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