The influence of surface strain on the chemical reactivity of fullerene ions: addition reactions with cyclopentadiene and 1,3-cyclohexadiene
Abstract
Experimental results are presented which demonstrate a dependence of chemical reactivity on the strain present in a carbon lattice. Rate coefficients have been measured at room temperature by using the selected-ion flow tube (SIFT) technique for the gas-phase addition of cyclopentadiene and 1,3-cyclohexadiene to the fullerene monocations C56[middle dot]+, C58[middle dot]+, C60[middle dot]+ and C70[middle dot]+, and the cations derived from corannulene and coronene. The observed reaction efficiencies show a strong dependence on the curvalure of the carbon lattice expressed in terms of the pyramidalization (POAV) angle, [theta][sigma][pi] - 90. The flat, strain-free coronene cation and the slightly strained corannulene cation do not react with a measurable rate, k < 1 x 10-13 cm3 molecule-1 s-1. The most severely strained C56[middle dot]+ and C581 fullerene ions react with a rate within a factor of about 10 of the collision limit.
- Publication:
-
International Journal of Mass Spectrometry and Ion Processes
- Pub Date:
- November 1997
- DOI:
- 10.1016/S0168-1176(97)00097-9
- Bibcode:
- 1997IJMSI.167..519B
- Keywords:
-
- Strain;
- Fullerene ions;
- Coronene;
- Corannulene;
- Diels-Alder addition;
- Chemical reactivity