Chlorine-passivated superatom Al37 clusters for nonlinear optics

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2018,（12）
• 页码范围: 1619-1623
• 页数: 5页
• 语种: 英文

摘要

Utilizing a facile top-down synthetic procedure,here we report the finding of a chlorine-passivated A137 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.