Abstract
Under high-level ab initio calculations, the geometrical structures and nonlinear optical properties of M@P4 (M=Li, Na, K and Li3O) and M@C3H6 (M=Li and Li3O) were investigated; all were found to exhibit considerable first hyperpolarizabilities (18110, 1440, 22490, 50487, 2757 and 31776 au, respectively). The computational results revealed that when doping the (super)alkali atom M into the tetrahedral P4 molecule, the original dual spherical aromaticity of the P4 moiety is broken and new σ electron cloud is formed on the face of P4 part interacting with the M atom. It was found that interaction of the (super)alkali atom with the σ electron cloud is a novel mode to produce diffuse excess electrons effectively to achieve a considerable β 0 value. Further, beyond the alkali atom, employing the superalkali unit can be a more effective approach to significantly enhance the first hyperpolarizability of the systems, due to the much lower vertical ionization potential. These results were further supported by the case of the (super)alkali atom interacting with the cyclopropane C3H6 molecule with its typical σ aromatic electron cloud. Moreover, the β 0 values of the M@P4 series are nonmonotonic dependent on alkali atomic number, namely, 1440 au (M = Na) < 18110 au (Li) < 22490 au (K), inferring that the distance between the alkali atom and the interacting surface with the σ electron cloud in P4 is a crucial geometrical factor in determining their first hyperpolarizabilities. These intriguing findings will be advantageous for promoting the design of novel high-performance nonlinear optical materials.
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Acknowledgments
This work was supported by National Natural Science Foundation of China (21103065, 21373099, 21073075 and 21173097), National Basic Research Program of China (973 Program) (2012CB932800), and the Ministry of Education of China (20110061120024 and 20100061110046). We acknowledge the High Performance Computing Center (HPCC) of Jilin University for supercomputer time.
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Zhao, X., Yu, G., Huang, X. et al. (Super)alkali atoms interacting with the σ electron cloud: a novel interaction mode triggers large nonlinear optical response of M@P4 and M@C3H6 (M=Li, Na, K and Li3O). J Mol Model 19, 5601–5610 (2013). https://doi.org/10.1007/s00894-013-2041-3
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DOI: https://doi.org/10.1007/s00894-013-2041-3