Synthesis and properties of supermolecular meso tetra(pyridyl)porphyrins and its layer-by-layer electrostatic assembled nanomaterials / Obtenção e propriedades de meso tetra(piridil)porfirinas supermoleculares e dos nanomateriais obtidos por montagem eletrostática camada por camada

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

A new series of nonplanar supermolecular metalloporphyrins have been obtained by coordenative self-assembly of meso-tetra(3-pyridyl)porphyrins and ruthenium complexes such as [Ru(bipy)2Cl]+ and [Ru(bipy)2(OH2)]2+. The electronic and structural properties have been investigated by electronic spectroscopy, mass spectrometry, cyclic voltammetry, and spectroelectrochemistry. The effects of the electronic coupling and molecular geometry on the molecular and nanomaterials properties were investigated in the gas phase and in solution. All results were compared with that obtained for the planar isomers obtained by the coordination of four [Ru(bipy)2Cl] groups to the meso-tetra(4-pyridyl)porphyrins. New nanomaterials were obtained by layer-by-layer electrostatic assembly of those supermolecular cationic porphyrins and tetrasulfonated porphyrins or phthalocyanines. The electrocatalytic properties were investigated for nitrite and sulfite. Electronic and supramolecular conformational effects were observed for those species in solution and in films of the nanomaterials. Moreover, a significant effect of the pH and of the transition metal ion coordinated to the porphyrin ring on the electrocatalytic activity were also observed.

ASSUNTO(S)

molecular sensor. films spectroscopy mass spectrometry porfirinas supermoleculares supermolecular porphyrins electrochemistry supramolecular chemistry espectrometria de massas espectroscopia eletroquímica sensores moleculares química supramolecular filmes

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