Synthesis, spectroscopical and electrochemical properties of triazene-porphyrin

Author(s)

Bernardo Almeida Iglesias

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ)
• Defense date: 2012-08-30

Examining board members

Koiti Araki; Lucio Angnes; Gianluca Camillo Azzellini; Yassuko Iamamoto; Herbert Winnischofer

• Advisor: Koiti Araki

Abstract

In this thesis we has been developed a new class of supramolecular porphyrins containing (4-nitrophenyl)triazene group connected in the meso-aryl-position of the porphyrin ring. Their structural and electronic properties were investigated by mass spectrometry, absorption and emission electronic spectroscopy, semi-empirical theoretical calculations, nuclear magnetic resonance of 1H and 13C-NMR, cyclic voltammetry and spectroelectrochemistry. Different structural and electronic effects were observed when the unit is inserted into the triazene to porphyrin, so that these presents new properties such as, for example, to fragmentation in the gaseous state, bathocrimic shift in the electronic absorption spectra, relative intensity variation and values the fluorescence quantum yields, electron delocalization in the frontier orbitals showing the charge-transfer transitions from the triazenide anion to the porphyrin ring and changes in redox processes of compounds previously studied. (AU)