Abstract
The authors discuss the synthesis of two carbon cluster-based chelating tridentate ligands, terpyridyl-pyrrolidine-fullerene (C60-tpy) and terpyridyl-pyrrolidine multiwalled carbon nanotube (MWCNT-tpy), by 1,3-dipolar cycloaddition. The two chelating ligands further coordinate with Ru(III) ions to yield two carbon cluster-based ruthenium complexes, C60-tpyRu(H2O)3Cl3 and MWCNT-tpyRu(H2O)3Cl3. The synthesized ligands and complexes were characterized by mass spectroscopy, nuclear magnetic resonance spectroscopy, infrared spectroscopy, ultraviolet/visible spectroscopy spectrometry, Raman spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and differential pulse voltammetry. Results show that grafting of carbon-clusters with the terpyridine ligand decrease the π* orbital energy level of the terpyridine moiety, and the electron-withdrawing ability of C60 is stronger than that of MWCNTs. This work aims to lay the foundation for the practical application of fullerenes and carbon nanotubes as functional materials.
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