Crystallographic evidence for the stereoselective substitution of equatorial pyridyl ligands in ruthenium(III) complexes

Chihiro Iwasaki; Ken Hishinuma; Tsugiko Takase; Dai Oyama

doi:10.1016/j.heliyon.2023.e14876

Crystallographic evidence for the stereoselective substitution of equatorial pyridyl ligands in ruthenium(III) complexes

Heliyon. 2023 Apr 5;9(4):e14876. doi: 10.1016/j.heliyon.2023.e14876. eCollection 2023 Apr.

Authors

Chihiro Iwasaki¹, Ken Hishinuma¹, Tsugiko Takase², Dai Oyama²

Affiliations

¹ Graduate School of Science and Engineering, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan.
² Department of Natural Sciences and Informatics, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan.

Abstract

Mononuclear Ru complexes catalyze dioxygen formation via water splitting; therefore, a detailed investigation into their water-oxidation process is necessary. In this study, we synthesized a series of Ru(III) complexes containing a dianionic tridentate ligand with three pyridine groups (one coordinated to Ru while the other two are "free") and investigated their substitution reactions in a water/acetonitrile mixture. Among the monodentate pyridyl ligands, the one at the equatorial position was crystallographically proven to be selectively substituted. Therefore, our results experimentally demonstrate the proposed coordination geometry for an intermediate during water oxidation over Ru complexes.

Keywords: Crystal structure; Dianionic ligand; Ruthenium(III) complex; Stereoselective substitution; Tridentate polypyridine.