Proposed retention mechanism of fullerenes on porphyrin-based HPLC columns

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:191748

Xiao, J; Martin, G B; Meyerhoff, M E ^[1]

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1. Univ. of Michigan, Ann Arbor, MI (United States)

Understanding of basic interaction chemistry is a critical step in the development of novel stationary phases for separation science. Recently, immobilized tetraphenylporphyrins (TPP; on 5-10 nun silica) have been investigated as novel stationary phases for fullerene, and PAH separations. In the normal phase mode, these columns (both metalated and unmetalated) appear to offer unprecedented selectivities with respect to fullerene separation. Indeed, La@C82, an endohedral metallofullerene, elutes from porphyrin-based column after C{sub 84} and the selectivity for C{sub 70}/C{sub 60} separation is dependent on the pore size of the silica gel onto which the porphyrins; are immobilized (i.e. a{sub C70/C60} increases sequentially with smaller pore size silica). Given the unique 3-dimensional symmetric structures of fullerenes, a retention mechanism is proposed that suggests that p-p interactions of a single fullerene simultaneously with more than one immobilized porphyrin species may occur on the porphyrin-silica stationary phase.

• OSTI ID: 191748
• Report Number(s): CONF-941098--
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
FULLERENES
LANTHANUM COMPOUNDS
LIQUID COLUMN CHROMATOGRAPHY
PORE STRUCTURE
PORPHYRINS
SILICA