title: Characterizing Covalently Sidewall-Functionalized SWCNTs by using1H NMR Spectroscopy.
abstract: Unambiguous evidence for covalent sidewall functionalization of single-walled carbon nanotubes (SWCNTs) has been a difficult task, especially for nanomaterials in which slight differences in functionality structure produce significant changes in molecular characteristics. Nuclear magnetic resonance (NMR) spectroscopy provides clear information about the structural skeleton of molecules attached to SWCNTs. In order to establish the generality of proton NMR as an analytical technique for characterizing covalently functionalized SWCNTs, we have obtained and analyzed proton NMR data of SWCNT-substituted benzenes across a variety of para substituents. Trends obtained for differences in proton NMR chemical shifts and the impact ofo-,p-, andm-directing effects of electrophilic aromatic substituents on phenyl groups covalently bonded to SWCNTs are discussed.
authors.affiliation: Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019 United States.
authors.forename: Donna J
authors.initials: DJ
authors.lastname: Nelson
authors.forename: Ravi
authors.initials: R
authors.lastname: Kumar
keywords: Chemical shift changes; SWCNT-substituted benzenes; electronic effects; p-substituted phenyl groups