Global Planar Tetra-, Penta- and Hexa-coordinate Silicon Clusters Constructed by Decorating SiO3 with Alkali Metals |
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Authors: | Meng-hui Wang De-hou Fei Chen Chen Yu-qian Liu Prof Dr Sudip Pan Prof Dr Zhong-hua Cui |
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Institution: | Institute of Atomic and Molecular Physics, Jilin University, Changchun, 130023 China |
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Abstract: | The achievement of the rule-breaking planar hypercoordinate motifs (carbon and other elements) is mainly attributed to a practical electronic stabilization mechanism, where the bonding of the central atom pz π electrons is a crucial issue. We have demonstrated that strong multiple bonds between the central atom and partial ligands can be an effective approach to explore stable planar hypercoordinate species. A set of planar tetra-, penta- and hexa-coordinate silicon clusters were herein found to be the lowest-energy structure, which can be viewed as decorating SiO3 by alkali metals in the MSiO3−, M2SiO3 and M3SiO3+ (M=Li, Na) clusters. The strong charge transfer from M atoms to SiO3 effectively results in M]+SiO32−, M2]2+SiO32− and M3]3+SiO32− salt complexes, where the Si−O multiple bonding and structural integrity of the Benz-like SiO3 framework is maintained better than the corresponding SiO32− motifs. The bonding between M atoms and SiO3 motif is best described as M+ forming a few dative interactions by employing its vacant s, p, and high-lying d orbitals. These considerable M←SiO3 interactions and Si−O multiple bonding give rise to the highly stable planar hypercoordinate silicon clusters. |
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Keywords: | cluster global minimum interaction multiple bond planar hypercoordinate silicon |
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