A poly[tris(N-(bipyridylylbutyl)pyrrole)ruthenium(II)]-RuO2 catalytic modified electrode for organic oxidations

Voltammetric behaviour, homogeneous charge transport dynamics and electrocatalytic properties of an Os2+ functionalised pyrrole monomer

“…Their exists two main methods of surface immobilisation, namely incorporation of the ionic complexes into a suitable polymeric matrix [11][12][13] or the electropolymerisation of the bypyridine complex that has been covalently grafted to reactive functional groups such as pyrroles and thiophenes. Conducting polymer films containing metal polypyridyl complexes, such as those of Co [14], Cu [15], Ru [12,16,17], Fe [17], Re [18] and Ni [19], covalently grafted to the polymer backbone have also received a lot of attention. The rationale for attachment of polypyridyl complexes stems from the fact that electropolymerised films of polypyridyl metal complexes are moderately permeable to ferrocene [17] and extremely permeable to small anions [16] such as the bromide ion, and as a result possess high ionic conductivities, but unfortunately exhibit poor to moderate electron transport properties.…”

“…Conducting polymer films containing metal polypyridyl complexes, such as those of Co [14], Cu [15], Ru [12,16,17], Fe [17], Re [18] and Ni [19], covalently grafted to the polymer backbone have also received a lot of attention. The rationale for attachment of polypyridyl complexes stems from the fact that electropolymerised films of polypyridyl metal complexes are moderately permeable to ferrocene [17] and extremely permeable to small anions [16] such as the bromide ion, and as a result possess high ionic conductivities, but unfortunately exhibit poor to moderate electron transport properties. This covalent grafting of the molecular electroactive species to the conducting polymer backbone, via the nitrogen atom of the pyrrole for example, has been achieved through the use of short inflexible spacer arms, such as 4-methyl-4'(2-pyrrol-1-ylethyl)-2,2'-bipyridine [14,16] and 3-(pyrrol-1-ylmethyl)pyridine [16,20].…”

Eletrodos de feltro de carbono modificados com filme dimérico de rutênio: aplicação em oxidações eletroquímicas de álcoois

“…Existe na literatura um grande número de trabalhos sobre a eletropolimerização de unidades monoméricas de pirrol N-substituídos com piridina, 2,2"-bipiridina e 2,2':6',2''-tripiridina acoplados a um centro metálico. Dentre eles incluem-se complexos polipiridínicos de rutênio (II) [13,14], rênio (I) [14][15][16], cobre (II) [14,17] e zinco (II) [14,18] por exemplo. Destes estudos verificou-se que o grupo pirrol, ligado a vários tipos de sistemas redox, permite uma deposição em um grande número de superfícies: metálicas, óxidos ou carbono, e que a polimerização não requer uma alta concentração do monômero [19].…”

Synthesis and characterization of poly-(allylbenzene p-sulphonate) films incorporating electrolessly deposited Ni–P

“…The ability of the metal to adsorb both the atomic hydrogen produced by proton reduction and the unsaturated organic substrate enables hydrogenation under mild conditions, i.e., avoiding the need for hydrogen gas production and the use of high temperatures and/or pressures. Polymeric matrices such as polythiophene [1], polypiridine [2] and polypyrrole [3] have been described for this purpose.…”

“…Its anodic oxidation yields stable polymers and a variety of cationic and anionic exchange groups can be envisaged, such as -NH 3 + , -CH 2 CH 2 NH 3 + or -SO 3 ) , as represented in scheme 1.…”