- 作者: Chien-Hua Su and I-Jy Chang
- 中文摘要: The acid dissociation constant, pKa, for the ground and excited states of ruthenium tris(4’-methyl-2,2’-bipyridine-4-carboxylic acid) complex have been measured. The ground state pKa obtained from the pH titration curve of the complex absorption at 454nm was 2.5. The lifetimes of the excited-state for deprotonated and protonated ruthenium complexes are 595 and 150ns, respectively. The excited-state pKa* is obtained from the emission titration curve at 630nm and corrected for the excited-state lifetime to be 4.2. The increase of 1.7 pH units in the acid dissociation constant in the excited-state indicates that the ligand is much more basic in the excited-sate. This result confirms the MLCT assignment for the lowest electronic transition of [Ru(mbpyCOOH)3]2+.
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