Formation and oxidative break-up of organometallic Ru–Ru bonded polymer films in DMSO electrolyte studied using the dimer [Ru(bpy)(CO)2Cl]2 (bpy=2,2′-bipyridine)

The mononuclear ruthenium(III)-2,3,5,6-tetrakis(2-pyridyl)pyrazine complex [Ru(bpy)(tppz)Cl][PF6]2: synthesis, crystal structure, electrochemical, and spectroelectrochemical studies

“…Elemental analysis of [Ru(bpy)(tppz)Cl][PF 6 ] 2 . acetylacetone was entirely consistent with its proposed composition, and attempts to determine its 1 H NMR (15) Ru-N(5) 2.0281 (15) Ru-N (7) 2.0309 (14) Ru-N(6) 2.0349 (15) Ru Figure 1 shows the coordination of the three ligands about the Ru(III) center. The distorted octahedral coordination sphere around the Ru(III) center is defined by the three N donor atoms of a tppz ligand bound in a j 3 -N(1), N(5), N(6) mode with the N(5) and N(6) atoms trans to each other, the N donor atoms (N(7) and N(8)) of a bpy ligand and one Cl -anion.…”

“…p* transitions, which are typically seen in the visible region of the spectrum. SEC techniques have been used to elucidate various properties of ruthenium complexes with 2,2 0 -bipyridine ligands [2,[14][15][16][17][18][19]. For instance, electronic absorption SEC measurements were used to confirm electrochemical assignments of [Ru(bpy)(dpp)] 2?…”

“…MacDonnell et al [16] used a combination of electronic absorption SEC, cyclic voltammetry, and differential pulse voltammetry to investigate two-electron/two-proton reduction processes in the mononuclear complex, [Ru(bpy) 2 (tatpp)]Cl 2 (where tatpp = 9,11,20,22-tetraaza-tetrapyrido[3,2-a:2 0 ,3 0 -c:3 00 ,2 00 -1:2 000 ,3 000 ]-pentacene). UV-vis SEC techniques were also applied for examination of the dissociation of the dimer [Ru(bpy)(CO) 2 Cl] 2 in DMSO electrolyte to form free chloride and a DMSO-coordinated monocation [15]. Our group has recently studied the SEC of the cyclometalated ruthenium chloro and nitrosyl complexes, [Ru(g 2 -phpy) (trpy)Cl][PF 6 ] and [Ru(g 2 -phpy)(trpy)NO][PF 6 ] 2 (where phpy is 2-phenylpyridine and trpy is 2,2 0 :6 0 ,2 00 -terpyridine) [20].…”

On the conducting [Ru(bpy)(CO)2]n (bpy=2,2’-bipyridine) polymer: Doping process, near-IR absorption, T-dependence and film growth

“…A Princeton Applied Research Model 283 potentiostat was used for electrochemistry in both conductance and spectroelectrochemical measurements. The electrochemical quartz crystal microbalance, EQCM has been described in [8]. All potential values are given vs. a Ag/AgCl reference electrode (c KCl = 3.4 mol dm À3 ).…”

“…It is now well established that the film consists of a Ru-Ru bonded polymer, [Ru 0 (bpy)(CO) 2 ] n (1, Fig. 1), which is formed through pyridine ligand-centred electroreduction of octahedral monomeric or dimeric precursor complexes bearing labile, usually axial ligands [2][3][4][5][6][7][8]. The overall electropolymerisation process for the monomer in [1] is shown in the following equation:…”