ABSTRACT
Three possible isomers of N-fused tetraphenylporphyrin ruthenium complexes, Ru(NFTPp)Cl(CO)2 (2a-c), were isolated and fully characterized by NMR, IR, CV, UV-vis-NIR absorption, and X-ray crystallographic analyses. Each isomer was stable at ambient conditions and isomerization among 2a-c occurred at elevated temperature both in solution and in a solid state, through the intramolecular rotational pathways. Electronic structures of 2a-c were analyzed in detail by DFT study to reveal appreciable differences in the interaction between the NFTPp ligand and the Ru-Cl moiety.
Subject(s)
Metalloporphyrins/chemistry , Metalloporphyrins/chemical synthesis , Porphyrins/chemistry , Ruthenium/chemistry , Models, Molecular , Molecular Structure , StereoisomerismABSTRACT
Reversible and non-bonding interaction between SWNTs and ODCB is observed from the analyses of visible near-infrared absorption data and Raman spectroscopies (see spectra). The solvent effect on SWNTs effectively controls the electronic structure of SWNTs under homogeneous conditions.The dispersion of single-walled carbon nanotubes (SWNTs) in o-dichlorobenzene (ODCB) is studied. Reversible and non-bonding interaction between SWNTs and ODCB is observed from the analyses of visible near-infrared (Vis-NIR) absorption data and Raman spectroscopy. This interaction should be one of the important factors for stable dispersion of SWNTs in ODCB. The solvent effect on SWNTs effectively controls the electronic structure of SWNTs under homogeneous conditions.
ABSTRACT
In the applications of single-walled carbon nanotubes (SWNTs), it is extremely important to separate semiconducting and metallic SWNTs. Although several methods have been reported for the separation, only low yields have been achieved at great expense. We show a separation method involving a dispersion-centrifugation process in a tetrahydrofuran solution of amine, which makes metallic SWNTs highly concentrated to 87% in a simple way.
