ORGN 762 |
| In the present paper, we report the synthesis of a new open-cage fullerene 2 containing a higher member of the group 16 elements, selenium, at the rim of the orifice and reveal the behavior of 2 to encapsulate and release molecular hydrogen. The insertion of H2 inside 2 takes place at relatively lower pressure and temperature. The rate of the hydrogen release followed the first-order kinetics with the rate constant (k1 in sec-1) of 4.63×10–6 s–1 at 150 oC, 1.05×10–5 at 160 oC, 2.62×10–5 at 170 oC, and 7.07×10–5 at 180 oC. These values are nearly three times larger than those for the sulfur analogue H2@3 as expected from the orifice-size enlargement. The lower activation energy for H2@2, 2 kcal/mol less than that of H2@3, shows consistency with the expected larger size of orifice that causes faster hydrogen escape at relatively lower temperature.
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Combinatorial, Parallel and Process Chemistry, Heterocycles, Aromatics, New Reactions and Methodology
8:00 PM-10:00 PM, Wednesday, August 22, 2007 BCEC -- Exhibit Hall - B2, Poster
Sci-Mix
Division of Organic Chemistry |
