Preparation, characterization, and formation pathways of ruthenium(II) complexes with chalcogenoether ligands

Thesis event information

Date and time of the thesis defence

Place of the thesis defence

OP auditorium (L10)

Topic of the dissertation

Preparation, characterization, and formation pathways of ruthenium(II) complexes with chalcogenoether ligands

Doctoral candidate

Licentiate Marjaana Taimisto

Faculty and unit

University of Oulu Graduate School, Faculty of Technology, Environmental and chemical engineering research unit

Subject of study



Professor Kari Rissanen, University of Jyväskylä


Docent Raija Oilunkaniemi, University of Oulu

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Preparation, characterization, and formation pathways of new ruthenium chalcogenoether complexes

Transition metal complexes containing organochalcogen ligands can be used, for example, as catalysts, model substances for studying the mechanism for desulfurization of petroleum products, and in the preparation of binary transition metal chalcogenides used in the fabrication of semiconductor materials.

In this work, mononuclear ruthenium complexes containing chalcogenoethers were prepared from ruthenium carbonyl chloride and a series of organic mono- and dichalcogenides. They were identified using NMR spectroscopy and their molecular structures were determined by X-ray crystallography. The relative stability of the different isomers of these complexes and the mechanisms of the formation reactions were explored utilizing both experimental and computational methods.

The results showed that the formation reactions are stepwise processes from the reagents to the products and they are independent of the solvent. The inferences made using computational methods were verified by identifying and structurally characterizing reaction intermediates in some of the reaction mixtures. The reaction of ruthenium carbonyl chloride and dithienyl ditelluride surprisingly afforded the similar end-product as the reaction with monochalcogenides. The ruthenium starting material was found to act both as a reagent and as a catalyst leading to the partial precipitation of tellurium from ditelluride and the formation of monotelluride.

This research provides additional information in the fundamental study of the structures and formation pathways of organometallic ruthenium complexes. The results will contribute to a better understanding of the metal complexes of organochalcogen compounds and to the development of new materials from the complexes.

Last updated: 23.1.2024