Porphyrin functionalized single-walled carbon nanotubes and their absorption and emission properties

In this study porphyrin monomers, 5,15–bis(4-(2,5,8,11-tetraoxatridecan-13-yloxy)phenyl)-10,20-bis(3-iodophenyl)porphyrin zinc (5a) and 5,10–bis(4-(2,5,8,11-tetraoxatridecan-13-yloxy)phenyl)-15,20-bis(3-iodophenyl)porphyrin zinc (5b), and their oligomers 6a and 6b were characterized by absorption end emission properties. The titration experiment of the monomers was carried out in THF by changing the solution percent of water. The optical properties (UV-vis and fluorescence spectra) of the monomers that possess slightly red-shifted optical spectra in water compared to the spectra obtained in THF are reported. The newly prepared porphyrin constructs were also mixed with SWCNTs to generate noncovalent hybrid materials. SWCNT samples were ultrasonicated in the presence of porphyrins 5a, 5b and their oligomers 6a, 6b and then centrifugated. Binding of 5a, 5b, 6a, 6b onto surfaces of SWCNTs was investigated by absorption and emission spectroscopy.