Abstract
Utilizing a facile top-down synthetic procedure, here we report the finding of a chlorine-passivated Al37 superatom cluster. It is demonstrated that the presence of electrophilic groups, severing as protecting ligands, alters the valence electron count of the metallic core and stabilize the as-prepared aluminum clusters especially when even-numbered chlorine atoms are located at equilibrium positions. Following the discussion regarding their reasonable stabilities, we illustrate the feasible reaction pathways in forming such chlorine-passivated Al37 superatom clusters which bear delocalized superatomic orbitals with five valence 3P5 electrons shifting to the chlorine ligands indicative of a closed electron shell 2F14 of the metal core. The successful synthesis of such chlorine-protected aluminum clusters evidences the compatibility of general theory of cluster chemistry in both gas phase and wet chemistry. Such simple-ligand-protected aluminum clusters exhibit reverse-saturated-absorption (RSA) nonlinear optical property pertaining to electronic transitions within the discrete energy states of cluster materials.
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Acknowledgements
This work was supported by the Key Research Program of Frontier Sciences (QYZDB-SSW-SLH024), the National Natural Science Foundation of China (21722308) and the National Thousand Youth Talents Program.
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Wu, H., Luo, Z. Chlorine-passivated superatom Al37 clusters for nonlinear optics. Sci. China Chem. 61, 1619–1623 (2018). https://doi.org/10.1007/s11426-018-9316-4
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DOI: https://doi.org/10.1007/s11426-018-9316-4