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Fig. 2 Synthesis of tris-heteroleptic compound [Ru(dpp)(bpy)(mtmp)](PF6)2 ([2](PF6)2). Conditions: (i) 1.0 eq. dpp, EtOH, reflux 2 h, Y = 51%. (ii) (a) 1.5 eq. Na2C2O4; water, reflux 1 h; (b) 1.0 eq. mtmp, ethylene glycol, reflux 3 h; (c) water; Y = 71%. (iii) (a) 1 M HClO4(aq)/CH3CN 1?:?1, reflux 1 h, (b) 1.0 eq. bpy, ethylene glycol, 100 °C, 6 h; (3) aqueous KPF6; Y = 28%.
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