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The Sequential C2 Addition Formation Mechanism of [6,6] Fullertube C36+36+12 n Series: A Theoretical Study
1Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, School of Chemistry & Chemical Engineering, Xiamen University, Xiamen, China.
Abstract:
Stimulated by the experimental observation of fullertube [Journal of the American Chemical Society. 2020, 142, 15,614-15,623], a systematic density functional study of the structures and the growth pathway of [6] fullertube C36+36+12n series is performed. Starting from D6d(1)-C72, D6h(24)-C84 can be described as consisting of two end-caps (half of D6d(1)-C72) attached to a C12 carbon ring. Potential energy surface calculations reveal that the optimal pathway for this growth process proceeds via six sequential and directional C2 insertions involving metastable heptagonal-ring intermediates and avoiding high-energy-barrier Stone-Wales rearrangements. These findings offer critical insight into the self-assembly mechanism of fullerene-based nanostructures and establish a theoretical basis for the rational design of tunable carbon nanomaterials.
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