From 1D to 2D: Controllable Preparation of 2D Ni-MOFs for Supercapacitors.

Controllable modulation strategies between one-dimensional (1D) and two-dimensional (2D) structures have been rarely reported for metal-organic frameworks (MOFs). Here, 1D, 1D/2D, and 2D Ni-MOFs can be facilely prepared by adjusting the ratio of Ni2+ and the pyromellitic acid linker. A low-dimensional structure can shorten the transmission distance, while MOFs with a high Ni2+ content can supply rich active sites for oxidation-reduction reactions. The 2D structure Ni-MOF with an optimized Ni2+/pyromellitic acid ratio presents a good performance of 1036 F g-1 at a current density of 1 A g-1 with a comparable rate performance of 62% at 20 A g-1. The study may offer a facile design to control the structure of MOFs for employing in electrochemical energy storage.

Radical-mediated click-clip reactions.

Click reactions, which are characterized by rapid, high-yielding, and highly selective coupling of two reaction partners, are powerful tools in synthesis but are rarely reversible. Innovative strategies that reverse such couplings in a precise and on-demand manner, enabling a click-clip sequence, would greatly expand the technique's versatility. Herein, a click and clip reaction pair is demonstrated by manipulation of a sulfilimine linkage. Phenothiazines and amines are rapidly and quantitatively coupled through oxidative sulfilimine bond formation with N-bromosuccinimide, and the resulting sulfilimine bromides then undergo quantitative reversion to the phenothiazines and amines through photoreduction at 380 nanometers. This protocol enables fabrication of depolymerizable macromolecules and reversible modification of aminosaccharides, demonstrating high selectivity and efficiency for manipulating sulfilimine linkages in complex systems.