Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/74841
Type: Artigo de periódico
Title: Supramolecular conformational effects in the electrocatalytic properties of electrostatic assembled films of meso(3-and 4-pyridyl) isomers of tetraruthenated porphyrins
Author: Mayer, I
Eberlin, MN
Tomazela, DM
Toma, HE
Araki, K
Abstract: Meso(3- and 4-pyridyl) porphyrins coordinated to four [Ru( bipy)(2) Cl](+) complexes, M(3-TRPyP) or M(4-TRPyP), where M=2H(+) and Zn2+, have been obtained and characterized by electrochemistry, spectroscopy and mass spectrometry. Layer-by-layer electrostatic assembled films with tetrasulfonated phthalocyaninatecuprate(II) anion, CuTSPc, displayed distinct electrocatalytic activity towards sulfite and nitrite oxidation. In general, the films derived from the M(4-TRPyP) isomers are more effective for the oxidation of nitrite, whereas those containing the M(3-TRPyP) isomers are more efficient for the oxidation of sulfite. The results demonstrated the influence of molecular geometry on the active sites of porphyrinic nanomaterials, enhancing the electron-transfer process in the M(3-TRPyP) derivative. This effect results from changes in the chemical environment around the active sites, induced by the contrasting molecular packing interactions with CuTSPc.
Subject: supramolecular chemistry
metalloporphyrins
electrostatic assembled films
electrocatalysis
electrochemistry
mass spectrometry
Country: Brasil
Editor: Soc Brasileira Quimica
Rights: aberto
Identifier DOI: 10.1590/S0103-50532005000300016
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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