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A stable cationic metal–organic framework (MOF) based on a neutral multidentate N-ligand and Ni(II) metal center has been successfully synthesized. The cationic MOF can effectively capture anions (MnO4− and CrO42−) from water through an anion exchange strategy. It is noteworthy that the post-synthesized cationic MOFs present better electrocatalytic performances for the hydrogen evolution reaction (HER) compared with the pristine MOF. [ABSTRACT FROM AUTHOR]

2D covalent organic frameworks (COFs) could have well‐defined arrangements of photo‐ and electro‐active units that serve as electron or hole transport channels for solar energy harvesting and conversion, but their insufficient charge transfer and rapid charge recombination impede the sunlight‐driven photocatalytic performance. We report a new donor–acceptor (D–A) system, PyTz‐COF that was constructed from the electron‐rich pyrene (Py) and electron‐deficient thiazolo[5,4‐d]thiazole (Tz). With its bicontinuous heterojunction, PyTz‐COF demonstrated exceptional optoelectronic properties, photocatalytic ability in superoxide anion radical‐mediated coupling of (arylmethyl)amines and photoelectrochemical activity in sunlight‐driven hydrogen evolution. Remarkably, PyTz‐COF exhibited a photocurrent up to 100 μA cm−2 at 0.2 V vs. RHE and could reach a hydrogen evolution rate of 2072.4 μmol g−1 h−1. This work is paving the way for reticular design of highly efficient and highly active D–A systems for solar energy harvesting and conversion. [ABSTRACT FROM AUTHOR]

Titelbild: Thiazolo[5,4-d]thiazole-Based Donor-Acceptor Covalent Organic Framework for Sunlight-Driven Hydrogen Evolution (Angew. Keywords: charge transfer; covalent organic frameworks; donor-acceptor; hydrogen production; solar energy harvesting EN charge transfer covalent organic frameworks donor-acceptor hydrogen production solar energy harvesting 1685 1685 1 01/20/21 20210125 NES 210125 B Donor-Akzeptor-Konjugation b und coplanare - -Stapelung befördern die Ladungstrennung und den Elektronentransport in einem porösen kovalent-organischen Gerüst, wie Hui Yang, Yue-Biao Zhang, Ke Wen et al. in ihrem Forschungsartikel auf S. 1897 beschreiben. Charge transfer, covalent organic frameworks, donor-acceptor, hydrogen production, solar energy harvesting. [Extracted from the article]