Probes the Influence of the Ligand-Field(LF) excited state onthe Metal-to-Ligand Charge Transfer(MLCT) excited stateBehavior of mono-, bis(bipyridine) ruthenium(Ⅱ) complexes

• Main Authors: Kan-Yao, Lin, 林干曜
• Other Authors: Yuan-Jang Chen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/38107055003332274599

碩士 === 輔仁大學 === 化學系 === 95 === This studies focused on photo-relaxation behavior of three types ruthenium-polypyridine complexes such as [Ru(Am)4(bpy)]2+, [Ru(Am)2- (bpy)2]2+ and [Ru(bpy)3]2+. Lever reported the singlet-triplet exchange energy(2Kexch) was 1,460 cm-1 for [Ru(bpy)3]2+ and was 4,160 cm-1 for [Ru(Am)4(bpy)]2+. We tried to find the 2Kexch energy of [Ru(Am)2(bpy)2]2+ in this work and found that the relationship of two parallel least-square lines between fundamental emission energies and half-wave potentials for two series of ruthenium-polypyridine complexes, [Ru(bpy)3]2+ and [Ru(Am)2(bpy)2]2+, implied the 2Kexch energies of [Ru(Am)2(bpy)2]2+ is 3358±695 cm-1. The fundamental emission energy vs. half-wave potentials of [Ru(bpy)2(CN)2] is out of linear-square line of the series of [Ru(Am)2(bpy)2]2+. The possible reason is the very different solvent reorganization energy between [Ru(Am)2(bpy)2]2+ and [Ru(bpy)2(CN)2]. We also imagine that the possible lowest energy triplet-ligand-field (3LF) excited-state of ruthenium-polypyridine complexes is the efficient quencher for excited ruthenium-polypyridine complexes.