121st General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code PHYS.P-229
Subject A Photoisomerization Study on [Ru(bpy)2(DMSO)2]2+ by Coupling Laser Excitation with Ion Mobility Spectrometry
Authors Chang Min Choi, Luke MacAleese1, Philippe Dugourd1, Fabien Chirot2,*
Korea Basic Science Institute, Korea
1Institut Lumière Matière, Université de Lyon, France
2Institut des Sciences Analytiques, Université de Lyon, France
Abstract Photoswitchable molecules are compounds that display the capability to switch between different isomer under irradiation, which are widely used for modern applications ranging from memory devices to optoelectronic devices. Especially, ruthenium (Ru)-based complex catalysts have been investigated for decades and recently Ru- dimethyl sulfoxide (DMSO) complexes were also reported that S → O and O → S linkage of DMSO were isomerized. Various studies in solution and theoretical studies have been reported to reveal an isomerization mechanism of these types of ruthenium complex cations. Hereby, we used a combination of mass spectrometry (MS), ion mobility spectrometry (IMS), and laser spectroscopy to understand an isomerization pathways of [Ru(bpy)2(DMSO)2]2+ (bpy = bipyridine) in the ground and excited states. Three different isomers of the complex were separated by using ion mobility measurements, which were assigned to the three possible binding schemes for the two DMSO ligands (SS, SO, and OO). Tandem-IMS experiments were then carried out to follow the isomerization pathways from each isomer. This could be done in the ground state by collisional activating and in excited state by laser irradiation of mobility-selected ions. In particular, we show that photoisomerization is possible for isolated [Ru(bpy)2(DMSO)2]2+, thus not implying ligand exchange with solvent molecules but internal rotation of ligands. Finally, based on IMS-resolved action spectroscopy measurements, we were able to characterize separately the optical properties of the different linkage isomers identified. These results are well suited to recent theoretical predictions.
E-mail cmchoi@kbsi.re.kr