Colossal C130 Fullertubes: Soluble [5,5] C130-D5h(1) Pristine Molecules with 70 Nanotube Carbons and Two 30-Atom Hemifullerene End-caps

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We report the seminal experimental isolation and DFT characterization of pristine [5,5] C 130 -D 5h (1) fullertubes. This achievement represents the largest soluble carbon molecule obtained in its pristine form. The [5,5] C 130 species is the highest aspect ratio fullertube purified to date and now surpasses the recent gigantic [5,5] C 120 -D 5d (1). In contrast to C 90, C 100, and C 120 fullertubes, the longer C 130 -D 5h has more nanotubular carbons (70) than end-cap fullerenyl atoms (60). Starting from 39,393 possible C 130 isolated pentagon rule (IPR) structures and after analyzing polarizability, retention time, and UV–vis spectra, these three layers of data remarkably predict a single candidate isomer and fullertube, [5,5] C 130 -D 5h (1). This structural assignment is augmented by atomic resolution STEM data showing distinctive and tubular “pill-like” structures with diameters and aspect ratios consistent with [5,5] C 130 -D 5h (1) fullertubes. The high selectivity of the aminopropanol reaction with spheroidal fullerenes permits facile separation and removal of fullertubes from soot extracts. Experimental analyses (HPLC retention time, UV–vis, and STEM) were synergistically used (with polarizability and DFT property calculations) to down select and confirm the C 130 fullertube structure. Achieving the isolation of a new [5,5] C 130 -D 5h fullertube opens the door to application development and fundamental studies of electron confinement, fluorescence, and metallic character for a fullertube series of molecules with systematic tubular elongation. This [5,5] fullertube family also invites comparative studies with single-walled carbon nanotubes (SWCNTs), nanohorns (SWCNHs), and fullerenes.

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