Superatoms have been investigated due to their possible substitution for other elements. The solution‐phase synthesis of superatoms has attracted attention to realize the availability of superatoms. However, the previous approach is basically limited to the formation of a single cluster. Here, superatoms are investigated and the number of valence electrons in these superatoms is changed by designing the number of gallium atoms present. Based on the dendrimer template method, clusters consisting of 3, 12, 13, and other numbers of atoms have been synthesized. The halogen‐like superatomic nature of Ga13 is structurally and electrochemically observed as completely different to the other clusters. The gallium clusters of 13 and 3 atoms, which can fill the 2P and 1P superatomic orbitals, respectively, exhibit different reactivities. The 3‐atom gallium cluster is suggested as being reduced to Ga3H2− due to the lower shift of energy levels in the unoccupied orbitals. The results for these gallium clusters provide candidates for superatoms.
Dendritic phosphors were obtained by the stepwise integration of BiCl in phenylazomethine dendrimers. The bismuth-coordinated phenylazomethines displayed photoluminescence at 500-800 nm, and the intensity could be tuned by changing the stoichiometry of BiCl and the dendrimer. This phosphor did not show serious luminescence quenching even though the local concentration of BiCl in the dendrimer was as high as 20 M, and luminescence was also observed in the solid state. The absorption and emission properties could be reversibly switched by addition of a Lewis base or under electrochemical redox control, which induced the reversible complexation of BiCl in the dendrimer.
Dendritic phosphors were obtained by the stepwise integration of BiCl 3 in phenylazomethine dendrimers.T he bismuth-coordinated phenylazomethines displayed photoluminescence at 500-800 nm, and the intensity could be tuned by changing the stoichiometry of BiCl 3 and the dendrimer.T his phosphor did not show serious luminescence quenching even though the local concentration of BiCl 3 in the dendrimer was as high as 20 m,a nd luminescence was also observed in the solid state.T he absorption and emission properties could be reversibly switched by addition of aL ewis base or under electrochemical redox control, whichi nduced the reversible complexation of BiCl 3 in the dendrimer.
In article number 1907167, Kimihisa Yamamoto and co‐workers describe the fabrication of gallium clusters, including a superatomic 13‐atom cluster, in solution with dendrimer templates, to demonstrate the effects of changing the number of atoms in a cluster. The chemical or physical properties are characterized and analyzed through transmission electron microscopy observation, mass spectroscopy, and electro chemical measurements, focusing on their reactivity and rigidity.
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