含胺取代之聯?啶釕錯化合物之光物理性質研究

Photophysical Properties of Ruthenium (II) Polypyridyl Complexes with Amino Substituted Bipyridine Ligands

陳麗如(Li-Ju Chen)

指導教授 ： 張一知

國立臺灣師範大學/理學院/化學系/碩士(2005年)

並列摘要

Ruthenium(II) polypyridyl complexes with amino substituted bipyridine ligands have been synthesized. Two ligands: 4,4’-diamino-2,2’-bipyridine (4,4’-dabpy) and 5,5’-diamino-2,2’-bipyridine (5,5’-dabpy) and six complexes: Ru(4,4’-dabpy)3, Ru(4,4’-dabpy)2bpy, Ru(4,4’-dabpy)bpy2, Ru(5,5’-dabpy)3, Ru(5,5’-dabpy)2bpy, and Ru(5,5’-dabpy)bpy2 were prepared.

The MLCT band of the complexes shifts to the red with increasing number of 4,4’-dabpy ligands. The absorption maxima are 471, 481 and 502 nm for Ru(4,4’-dabpy)bpy2, Ru(4,4’-dabpy)2bpy, and Ru(4,4’-dabpy)3, respectively. The MLCT band of the complexes with 5,5’-dabpy ligands shifts to the blue. The absorption maxima are 452, 450 and 420 nm for Ru(5,5’-dabpy)bpy2, Ru(5,5’-dabpy)2bpy, and Ru(5,5’-dabpy)3, respectively.

The emission quantum yield changes at various pH at room temperature. Generally, complexes with more amino bipyridine ligands have higher quantum yield in basic solution. Complexes with less amino bipyridine ligands have higher quantum yield in acidic solution.

The UV-Vis absorption and emission spectra of these complexes do not change from acidic to basic conditions at room temperature. Only the emission of Ru(5,5’-dabpy)3 shifts from 631 nm to 572 nm.

The emission maximum at 77 K shifts to higher energy at pH 2. The complexes with 5,5’-dabpy ligands are less sensitive to the pH than the complexes with 4,4’-dabpy lignds.

並列關鍵字

Ruthenium ； polypyridyl ； complexes