Direct Synthesis of Highly Designable Hybrid Metal Hydroxide Nanosheets by Using Tripodal Ligands as One‐Size‐Fits‐All Modifiers

Abstract

How did the collaborationo nt his project start? This work is ac ollaboration between two research groups in Waseda University (Kuroda-Shimojima-Wada Laboratory,w ith an interest in the synthesis of inorganic solids from molecular precursors) and the University of To kyo (Mizuno-Yamaguchi Laboratory, with an interest in the catalysis of metal oxide cluster compounds like polyoxometalates). The collaboration started when one of the authors (Y.K.) moved between these groups. During many discussions , we came to the idea that several polyoxometalates can be regarded as building blocks of inorganic solids, and techniques developed specially for the chemical design of polyoxometalates can also be applied to inorganic solids like brucite-type layered metal hydroxides. Thus, we succeeded in establishing the novel synthetic concept of hybrid metal hydroxide nanosheets by combining the chemistries of layered metal hydroxides and polyoxometalates. What is the most significant result of this study? The modification reaction developed in this study can be applied to aw ide range of materials, in terms of constituent metallic elements of metal hydroxide nanosheets and those of surface functional groups. Because tripodal ligands have flexible tridentate binding sites, they can adjust their conformations to metal hydrox-ide nanosheets with different lattice constants;t his is expressed by the phrase "one-size-fits-all modifier" in the title. What was the inspiration for this cover design? The cover design was inspired by the Japanese Sushi culture. We enjoy various fishes in as tandardized style, in which as lice of af ish is placed on av inegared rice ball. In this study,w ec an provide various metal hydroxide nanosheets in as tandardized method. The future goal of this study will be the production of designed nanosheets which satisfy the demands of functional devices , in the same way as aS ushi master makes flavored Sushi that fits the customer's taste. Invited for the cover of this issue is the group of Yoshiyuki Kuroda and Kazuyuki Kuroda at the Waseda University in Tokyo. The image depicts how the production of diverse metal hydroxide nanosheets can be standardized in the same way as Sushi. Read the full text of the article at

Preparation of Mesoporous Basic Oxides through Assembly of Monodispersed Mg–Al Layered Double Hydroxide Nanoparticles

“…It was confirmed by 13 C cross‐polarization magic‐angle spinning nuclear magnetic resonance (CP/MAS NMR) and Fourier‐transform infrared (FTIR) spectra of the LDHNPs that THAM was covalently attached to the surface of the particles through M−O−C (M=Mg or Al) bonds (see Figures S1 and S2 in the Supporting Information). The assignments of the signals and bands are described in the Supporting Information, and have been fully discussed in our previous reports . When the concentration of THAM is relatively low (i.e., 0.1 m ), it predominantly modifies the outermost basal plane of a platelet, resulting in a reduction in the number of layers.…”

Formation processes, size changes, and properties of nanosheets derived from exfoliation of soft layered inorganic–organic composites

“…8,9 Exfoliation of layered compounds based on electrostatic interaction generally originates from the intercalation of bulky ions into the interlayer space. [15][16][17][18][19] Layered double hydroxides consisting of cationic layers and anionic guest ions were exfoliated into nanosheets by sonication within 0.5-12 h in a polar organic medium, where the interlayer cation was changed to a larger anion, such as perchlorate. 68,69 Exfoliation of layered transition-metal oxides was performed by intercalation of bulky cations, such as tetrabutylammonium, and subsequent osmotic swelling for 10 days or longer periods.…”

“…[1][2][3][4][5][6][7][8][9][10] A variety of layered materials are exfoliated into nanosheets, such as monolayer and few-layer nanosheets. [11][12][13][14][15][16][17][18][19] Anisotropic nanostructures exhibit characteristic properties different from those of bulk materials and isotropic morphologies. [20][21][22][23][24][25][26][27][28] Exfoliation is a general route to obtain nanosheets from precursor layered materials.…”

Interconnection of organic–inorganic hybrid nano-building blocks towards thermally robust mesoporous structures

“…29 However, it has remained a challenge to synthesize mesoporous materials using LDH NBBs with a wide variety of chemical compositions. 30 Additionally, our group reported another route to synthesize LDH NBBs using epoxides as alkalinizing agents, 31 and these were assembled into ordered mesoporous structures. 32 Highly ordered mesoporous structures were prepared using not only LDH NBBs but also layered single metal hydroxide NBBs having a wide range of chemical compositions.…”