Study On The Interaction Of Porphyrins-Functionalized Multi-walled Carbon Nanotubes With Cyclodextrins And DNA

Functionalization of carbon nanotubes through reaction with porphyrins has attracted significant interest recently. Due to their unqiue structure and excellent photoelectric properties, porphyrins-functionalized multi-walled carbon nanotubes (MWNTs) has been widely applied in various fields, such as solar cells , photoelectric materials, biomimetic chemisty , and so on. In this paper, some new porphyrins-functionalized MWNTs were synthesized, and studied the interaction with cyclodextrin and DNA, to explore the complexes in the biomimetic chemisty application and research the mode of action with cyclodextrin and DNA.We synthesized 5-(4-hydroxyphenyl)-10, 15-bis(4-sulfophenyl)-20-phenylporphy- rin, 5-(4-hydroxyphenyl)-10, 15, 20-tris(4-nitrophenyl) porphyrins, tetrakis-(4-sulfon- atophenyl)porphyrin and the complexes of functionalized MWNTs. The molecular structures and performances of all the above compounds were characterized by 1H NMR, FT-IR, UV-vis, Fluorescence spectra, and MALDI-TOF-MS.The supramolecular system of the porphyrins-functionalized MWNTs with cyclod- extrin were stuied by means of UV-visible spectrophotometry, fluorescence spectrosc- opy and transmission electron microscopy. The results show that the noncovalently porphyrins-functionalized MWNTs formed supramolecular system with cyclodextrin.The interaction of the porphyrins-functionalized MWNTs with cyclodextrin and DNA were investigated via instruments of UV-visible spectrophotometry, fluorescen- ce spectroscopy and transmission electron microscopy. Results represents that the no- ncovalently porphyrins-functionalized MWNTs interaction with DNA, and stronger than the interaction with cyclodextrin.