Metal complexation with pyridine and phosphine functionalized single walled carbon nanotubes


Christopher E. Hamilton, chamilton@rice.edu1, Doug Ogrin2, and Andrew R. Barron, arb@rice.edu2. (1) Department of Chemistry- MS 60, Rice University, 6100 Main St., Houston, TX 77005, (2) Department of Chemistry, Smalley Institute for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston, TX 77025
Much attention has been paid to the Ďamplification' of single walled carbon nanotubes (SWNTs) by seeded growth. Analogous to the polymerase chain reaction (PCR) used to amplify DNA samples; seeded SWNT growth will allow the production of specific diameter and chirality tubes. Seeded growth has been demonstrated by the attachment of a metallic catalyst particle to the cut end of a SWNT. We herein report improvement of catalyst-SWNT docking by functionalizing tube ends with nitrogen and phosphorus. The ends of SWNTs have been coupled via esterification reactions to 4-hydroxypyridine and 4-hydroxyphenyl-diphenylphospine. Complexation of iron (III), cobalt (II), and nickel (II) with N- and P-SWNTs has been shown by UV-visible spectroscopy and 31P NMR.