Radchada Buntem, Samart Hongthong, and Laddawan Pdungsap

pp. 125 - 132

Abstract

The ether-linked porphyrin dimers in this research work were prepared from coupling reaction between suitable porphyrin precursors and linkers in the presence of potassium carbonate. The structures of all synthesized compounds were characterized by spectroscopic methods. The UV/Visible absorption maxima and extinction coefficients did not show any significant difference among these porphyrin dimers. This indicates that the length of the linker did not affect the absorption
property of the dimers. However, different metal ions bonding to the porphyrin moiety affect the different absorption maxima of the porphyrin dimers. It was also found that the position of the linker on the phenyl ring of porphyrin does not affect the visible absorption pattern or the proton chemical shifts of the porphyrin core as found in the case of Zn₂
(meta)C-dimer (13) (compared with the data obtained for Zn₂C₂-dimer (3)).