一系列Ru(II)配合物电致化学发光性质的比较研究

比较研究了以C₂O₄^2－为共反应物时5个结构相关的Ru(II)配合物Ru(bpy)₂L¹]^2＋, Ru(bpy)₂L²]^2＋, Ru(bpy)₂L³]^2＋, Ru(phen)₂L¹]^2＋和Ru(phen)₂L²]^2＋(其中bpy＝2,2′-联吡啶, phen＝1,10-邻菲啰啉, L¹＝4-羧基苯基咪唑4,5-f]1,10]邻菲啰啉, L²＝3-羧基-4-羟基苯基咪唑4,5-f]1,10]邻菲啰啉, L³＝3,4-二羟基苯基咪唑4,5-f]1,10]邻菲啰啉)的电致化学发光(ECL)性质. 结果表明, 酚羟基的存在能有效地淬灭Ru(II)配合物Ru(bpy)₂L²]^2＋, Ru(bpy)₂L³]^2＋和Ru(phen)₂L²]^2＋的ECL, 其它Ru(II)配合物的ECL量子效率与Ru(bpy)₃]^2＋相差不大.

A Comparative Study on Electrochemiluminescent Properties of a Series of Ruthenium(II) Complexes

Electrochemiluminescent (ECL) properties of 5 structurally related Ru(II) complexes of Ru(bpy)₂L¹]^2＋, Ru(bpy)₂L²]^2＋, Ru(bpy)₂L³]^2＋, Ru(phen)₂L¹]^2＋and Ru(phen)₂L²]^2＋(where bpy＝2,2′-bipyridine, phen＝1,10-phenanthroline, L¹＝4-carboxylphenylimidado4,5-f]1,10]phenanthroline, L²＝3-carboxyl-4-hydroxylphenylimidado4,5-f]1,10]phenanthroline, and L³＝3,4-dihydroxyphenylimidado- 4,5-f]1,10]phenanthroline) have been studied in CH₃CN/H₂O (V/V, 1∶1) by using oxalate as coreactant. The results indicate that the presence of hydroxyl in Ru(bpy)₂L²]^2＋, Ru(bpy)₂L³]^2＋and Ru(phen)₂L²]^2＋effectively quenches ECL, and the other complexes exhibit comparable ECL efficiencies to Ru(bpy)₃]^2＋.