332406-58-3Relevant academic research and scientific papers
A donor - Acceptor - Donor bridging ligand in a class III mixed-valence complex
Mosher,Yap,Crutchley
, p. 1189 - 1195 (2001)
The novel mononuclear and dinuclear complexes [Ru(trpy)(bpy)(apc)][PF6] and [{Ru(trpy)(bpy)}2(μ -adpc)][PF6]2 (bpy = 2,2′-bipyridine, trpy = 2,2′:6′,2″-terpyridine, apc- = 4-azo(phenylcyanamido)benzene, and adpc2- = 4,4′ -azodi(phenylcyanamido)) were synthesized and characterized by 1H NMR, UV-vis, and cyclic voltammetry. Crystallography showed that the dinuclear Ru(II) complex crystallizes from diethyl ether/acetonitrile solution as [{Ru(trpy)(bpy)}2gt-adpc)][PF6] 2·2(acetonitrile)·2(diethyl ether). Crystal structure data are as follows: crystal system triclinic, space group P1, with a, b, and c = 12.480(2), 13.090(3) and 14.147(3) A, respectively, α, β, and γ = 79.792(3), 68.027(3), and 64.447(3)°, respectively, V = 1933.3(6) A, and Z = 1. The structure was refined to a final R factor of 0.0421. The mixed-valence complex with metal ions, separated by a through-space distance of 19.5 A, is a class III system, having the comproportionation constant Kc. = 1.3 × 1013 and an intervalence band at 1920 nm (εmax = 10 000 M-1 cm-1), in dimethylformamide solution. The results of this study strongly suggest that the bridging ligand adpc2- can mediate metal-metal coupling through both hole-transfer and electron-transfer superexchange mechanisms.
