Search

Precise shaping of metal–organic frameworks (MOFs) is significant in both fundamental coordination chemistry and practical applications, such as catalysis, separation, and biomedicine. Herein, we demonstrated a linker scissoring strategy for precisely shaping MOFs through surface conformational pairing. In this strategy, the bidentate linkers which were designed according to the original tetratopic ligands and the coordination environment of MOF surfaces, were utilized as the covering agents. The shape of these covering agents and the surface conformation of metals onto MOFs restricted them to coordinate on specific MOF facets thus precisely controlling the shape of the MOFs. Different shapes of PCN‐608 from nanoplate (PCN‐NP) to nanorod (PCN‐NR) have been targeted by adding different bidentate linkers. The universality of this strategy was demonstrated by controlling the shapes of the NU‐MOFs from nanoplate to nanorod. This strategy provides a new guiding principle to synthesize MOF nanocrystals with controlled shapes. [ABSTRACT FROM AUTHOR]

High‐efficiency photocatalysis in metal‐organic frameworks (MOF) and MOF nanosheets (NSs) are often limited by their short‐lived charge separation as well as self‐quenching. Here, we propose to use the energy‐transfer process (EnT) to increase charge separation, thus enhancing the catalytic performance of a series of MOF NSs. With the use of NS, the photocatalyst can also be well isolated to reduce self‐quenching. Tetrakis(4‐carboxyphenyl) porphyrin (H4TCPP) and 1,3,6,8‐tetrakis(p‐benzoic acid)pyrene (H4TBAPy) linkers were chosen as the acceptor and donor moieties, respectively. Accounting for the precise spatial design afforded by the MOF NSs, the donor and acceptor moieties could be closely positioned on the NSs, allowing for an efficient EnT process as well as a high degree of site isolation. Two templates, donor‐on‐acceptor NS and acceptor‐on‐donor NS catalysts, were successfully synthesized, and the results show that the second one has much enhanced catalytic performances over the first one due to site‐isolated active photocatalysts. [ABSTRACT FROM AUTHOR]

The tuning of metal–organic framework (MOF) nanosheet stacking modes from molecular level was rarely explored although it significantly affected the properties and applications of nanosheets. Here, the different stacking modes of Zr‐1, 3, 5‐(4‐carboxylphenyl)‐benzene framework nanosheets were synthesized through the induction of different host–guest noncovalent interactions. The solvents of methyl benzene and ethyl acetate induced twisted stacking of nanosheets with the specific rotation angles of 12°, 18°, 24° and 6°, 18°, 24°, 30°, respectively, which was in agreement with theoretical calculations. Meanwhile, the alkanes were likely to vertically enter the pores of Zr‐BTB nanosheets because of steric hindrance and hydrophobic interactions, resulting in the untwisted stacking of nanosheets. The untwisted ordered nanopores showed the excellent gas chromatographic separations of benzene derivative isomers, which was better than twisted nanosheets stacking and commercial columns. This work uncovers a rational strategy to control the stacking of two‐dimensional MOF nanosheets. [ABSTRACT FROM AUTHOR]

Keywords: Design; Linker Scissoring; Metal-Organic Frameworks; Separation; Shaping EN Design Linker Scissoring Metal-Organic Frameworks Separation Shaping 1 1 1 09/07/22 20220912 NES 220912 B Eine "Linker-Scissoring"-Strategie b wird im Forschungsartikel (e202207786) von Hong-Cai Zhou, Zhi-Yuan Gu und Mitarbeitern vorgestellt, mit der die Form nanopartikulärer metallorganischer Gerüste (MOFs) von Nanoplättchen zu Nanostäbchen durch Oberflächenkonformationspaarung gesteuert werden kann. Design, Linker Scissoring, Metal-Organic Frameworks, Separation, Shaping Titelbild: Linker Scissoring Strategy Enables Precise Shaping of Metal-Organic Frameworks for Chromatographic Separation (Angew. [Extracted from the article]

Frontispiece: Controlling the Stacking Modes of Metal-Organic Framework Nanosheets through Host-Guest Noncovalent Interactions Host-guest noncovalent interactions, metal-organic frameworks, nanosheet, separation, stacking Keywords: host-guest noncovalent interactions; metal-organic frameworks; nanosheet; separation; stacking EN host-guest noncovalent interactions metal-organic frameworks nanosheet separation stacking 1 1 1 03/19/21 20210322 NES 210322 B Metal-Organic Frameworks b In their Communication on page 6920, Da-Huan Liu, Zhi-Yuan Gu et al. report a host-guest noncovalent strategy to tune the stacking modes of metal-organic framework nanosheets for alkane isomer separation. [Extracted from the article]