Journal
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
Volume 1, Issue 5, Pages 824-826Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ct0501351
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A sigma-pi separation analysis of the energies in Al4Li4 reveals that the system is more, pi-antiaromatic than the sigma-aromaticity in it. This is true also for C4H4 and Ga4Li4. Unlike C4H4 that has a very large component of pi-antiaromaticity, for these all-metal clusters, these energy scales are comparable though pi-antiaromaticity is the major driving force for the distortion of the molecules from the square (sigma-aromatic) structure to the rectangular (pi-antiaromatic) architecture. For the dianion Al4Li42-, the sigma-equalization prevails over the pi-distortion in Al4Li4, and for the dication Al4Li42+, pi-equalization is the driving force for the square symmetric structure.
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