Uses of single-walled carbon nanotube salts in syntheses

ORGN 87

Feng Liang, liangf@rice.edu, Lawrence B. Alemany, lalemany@mail.rice.edu, Jonathan M. Beach, jonbeach@rice.edu, and W. E. Billups, billups@rice.edu. Department of Chemistry, Rice University, Houston, TX 77005
Reductive alkylation of nanotube salts prepared using either lithium, sodium or potassium in liquid ammonia yields sidewall-functionalized nanotubes that are soluble in common organic solvents. Atomic force microscopy and transmission electron microscopy of dodecylated SWNTs prepared from HiPco nanotubes and 1-iodododecane show that extensive debundling has occurred. This sonication free process provides a means to measure the length of the SWNTs by atomic force microscopy. The debundling can be explained in terms of extensive intercalation by the alkali metal, leading to metal ions dispersed between the negatively charged tubes. Differences in the solid state 13C NMR spectra of dodecylated SWNTs prepared by different alkali metals were readily observed and analyzed. Dipolar dephasing spectra showed the presence of quaternary aliphatic carbons, i.e., nanotube sp2 carbons that became sp3 carbons upon dodecylation. The chemical shifts of these quaternary aliphatic carbons more closely resemble those in dialkyldihydro derivatives of large planar condensed aromatic hydrocarbons than in the analogous derivatives of the highly curved fullerenes C60 and C70.
 

New Reactions and Methodology, Materials, Total Synthesis, Process R&D
8:00 PM-10:00 PM, Sunday, 28 August 2005 Washington DC Convention Center -- Hall A, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, 29 August 2005 Washington DC Convention Center -- Hall A, Sci-Mix

Division of Organic Chemistry

The 230th ACS National Meeting, in Washington, DC, Aug 28-Sept 1, 2005