Synthesis and characterization of porphyrin complexes grafted on multiwalled carbon nanotubes

PHYS 430

Jun Jin, jinjun@lzu.edu.cn1, Jiantai Ma, majiantai@lzu.edu.cn1, and Zi-Ling Xue, xue@ion.chem.utk.edu2. (1) College of Chemistry and Chemical Engineering, Lanzhou University, 222 South Tianshui Road, Lanzhou, Gansu, 730000, China, (2) Department of Chemistry, The University of Tennessee, Knoxville, TN 37996-1600
Absract: 5-p-Hydroxyphenyl-10,15,20-triphenyl-porphyrin has been grafted on multi-walled carbon nanotubes (MWCNTs) through the reaction of the porphyrin with surface carboxylate groups on MWCNTs. Co2+ and Zn2+ complexes of the grafted porphyrin have been prepared. The grafted porphyrin and its two complexes have been characterized by spectroscopy (FT-IR, Raman and UV-vis), TGA, and TEM. The quantity of grafted porphyrin on the MWCNTs was determined by thermogravimeric analysis (TGA), showing a weight loss of ca. 60% between 200 and 500 oC. Studies with Raman spectroscopy showed that the most electronic properties of the MWCNTs were retained after grafting. The fluorescence of the porphyrin and its Co2+/Zn2+ complexes was nearly quenched by MWCNTs, indicating that the grafting leads to an energy/electron transfer between the excited porphyrin moiety and the extended π-system of MWCNTs.
 

PHYS Poster Session - Nanostructured Materials and Nanophotonics
7:30 PM-10:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster

Division of Physical Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008