Table 1.
Apparent excited state pKa for various complexes bearing bpy (2,2'-bipyridine), bpm (2,2'-bipyrimidine), bpz (2,2'-bipyrazine), TAP (1,4,5,8-tetraazaphenanthrene) and dpqp (pyrazino[2',3':5,6]pyrazino[2,3-f][1,10]phenanthroline) ligands [108,109,110,111].
| Complex | pKa*(app) |
|---|---|
| [Ru(TAP)3]2+ | 3.5 |
| [Ru(TAP)2(bpy)]2+ | 4 |
| [Ru(TAP)(bpy)2]2+ | 3.1 |
| [Ru(bpy)2(dpqp)]2+ | 2.1 |
| [Ru(bpz)3]2+ | 3.30 |
| [Ru(bpz)2(bpm)]2+ | 3.4 |
| [Ru(bpm)2(bpz)]2+ | 3.5 |
| [Ru(bpz)2(bpy)]2+ | 3.4 |
| [Ru(bpy)(bpz)(bpm)]2+ | 3.1 |
| [Ru(bpy)2(bpz)]2+ | 2.8 |
| [Ru(bpm)3]2+ | 2.35 |
| [Ru(bpm)2(bpy)]2+ | 2.25 |
| [Ru(bpy)2(bpm)]2+ | 1.90 |