On the nature of the electrode surface modification by cathodic reduction of tetraarylporphyrin diazonium salts in aqueous media

作者：Picot Matthieu; Nicolas Irene; Poriel Cyril^*; Rault Berthelot Joelle; Barriere Frederic

来源：Electrochemistry Communications, 2012, 20: 167-170.

DOI：10.1016/j.elecom.2012.04.020

• Tetraarylporphyrins
• Aryl diazonium salts reduction
• Electrografting
• Conducting polymers

Different substrates have been modified through electroreduction of tetraarylporphyrin diazonium salts, H2TPP-N-2(+) or H2TPP-(N-2(+))(4), generated in situ in acidic aqueous media from monoamino-TPP (H2TPP-NH2) or tetraamino-TPP (H2TPP-(NH2)(4)) in low concentration (5.10(-4) M). The modification of the electrodes with H2TPP-(NH2)(4) leads to a purple deposit (PolyH(2)TPP-1) strongly linked to the electrode surface whereas those obtained from H2TPP-NH2 were not covalently linked to the electrode surface, soluble in organic solvents and identified as tetraphenylporphyrin (H2TPP). The deposits have been characterized by electrochemistry, atomic force microscopy (AFM) and UV-Visible absorption spectroscopy. Cyclic voltammetry of PolyH(2)TPP-1 revealed an electroactivity akin to that of polytetraatylporphyrin obtained by anodic electropolymerization of H2TPP (similar to 2.10(-3) M) in strictly anhydrous electrolytic medium (PolyH(2)TPP-2). In light of their UV-vis spectra, the two related polymers present different intermolecular interactions and macromolecular organization.

• 出版日期2012-7