双核三联吡啶钌(Ⅱ)配合物的合成及其光谱和电化学性质

Synthesis and Characteristics of Dinuclear Ruthenium(Ⅱ) Complexes with 2,2′:6′,2″-Terpyridine as the Ligand

设计合成了以对乙烯基苯撑齐聚体为桥的双2,2′：6′,2″-三联吡啶配体,经过分步配位,得到双核三联吡啶钌（Ⅱ）配合物. 光谱研究表明,这类配合物在室温下存在强的金属到配体的电荷转移（MLCT）吸收峰. 常温下由于其激发态寿命太短而无荧光发射,而在低温（77 K）下,则表现出红光发射（639～641 nm）. 双核配合物中基于中心离子钌的可逆的氧化电位在＋1.25 eV左右,基于三联吡啶单元的第一还原电位位于-1.15 eV左右,第二还原电位则位于-1.38 eV左右.

The bisterpyridine ligands with oligo-PPV as spacer were designed and synthesized. Through step by step coordination, dinulear ruthenium complexes with terpyridine as the ligand were obtained. The complexes exhibited a strong metal to ligand charge transfer（MLCT） absorption peak at about 490 nm, while no emission was observed at ambient temperature because of the very short excited state time. All of the complexes, however, exhibited strong red emission （about 639 -641 nm） at 77 K. The oxidation wave attributed to the ruthenium（ Ⅱ ） ion at about ＋ 1.25 V and the two reductive waves at about - 1.15 V and -1.38 V（vs. Ag/AgCl） assigned to the terpyridine-based moiety were observed for the dinuclear ruthenium complexes.