Efficient Transformation of Polymer Main Chain Catalyzed by Macrocycle Metal Complexes via Pseudorotaxane Intermediate.

Post-synthesis modification of polymers streamlines the synthesis of functionalized polymers, but is often incomplete due to the negative polymer effects. Developing efficient polymer reactions in artificial systems thus represents a long-standing objective in the fields of polymer and material science. Here, we show unprecedented macrocycle-metal-complex-catalyzed systems for efficient polymer reaction that result in 100 % transformation of the main chain functional groups presumably via a processive mode reaction.

Structural Transformable Coulomb Lattice of n-Type Semiconductors for Guest Sorption.

In recent years, highly designable organic porous materials have attracted considerable attention in the development of new types of molecular adsorption-desorption materials. The adsorption-desorption process also changes the electronic structure via the existence of guest molecules. Therefore, it is possible to change the physical property during the guest adsorption-desorption cycle using an appropriate chemical design of the host crystal lattice.

Characterization of UDP-glucose dehydrogenase isoforms in the medicinal legume .

Uridine 5'-diphosphate (UDP)-glucose dehydrogenase (UGD) produces UDP-glucuronic acid from UDP-glucose as a precursor of plant cell wall polysaccharides. UDP-glucuronic acid is also a sugar donor for the glycosylation of various plant specialized metabolites. Nevertheless, the roles of UGDs in plant specialized metabolism remain poorly understood.

Crystal Lattice Design of HO-Tolerant n-Type Semiconducting Dianionic Naphthalenediimide Derivatives.

Dianionic bis(propionate)-naphthalenediimide () formed simple 2:1 cation-anion salts of (M)()·(HO) (M = Li, Na, K, Rb, and Cs), which exhibited reversible HO adsorption-desorption behavior because of the presence of their electrostatically binding crystal lattices. The maximum HO adsorption amounts () for M = Li, Na, K, Rb, and Cs were 0.25, 6.

Switching of Electron and Ion Conductions by Reversible HO Sorption in n-Type Organic Semiconductors.

Polar HO molecules generally act as trapping sites and suppress the electron mobility of n-type organic semiconductors, making chemical design of HO-tolerant and responsive n-type semiconductors an important step toward multifunctional electron-ion coupling devices. The introduction of effective electrostatic interactions between potassium ions (K) and carboxylate (-COO) anions into the electron-transporting naphthalenediimide π-framework enables the design of high-performance HO-tolerant n-type semiconductors with a reversible HO adsorption-desorption ability, where the electron mobility and K ionic conductivity were coupled with the reversible HO sorption behavior. The reversible HO adsorption into the crystals enhanced the electron mobility from 0.

Inserting Nitrogen: An Effective Concept To Create Nonplanar and Stimuli-Responsive Perylene Bisimide Analogues.

Establishing design principles to create nonplanar π-conjugated molecules is crucial for the development of novel functional materials. Herein, we describe the synthesis and properties of dinaphtho[1,8-:1',8'-]azepine bisimides (DNABIs). Their molecular design is conceptually based on the insertion of a nitrogen atom into a perylene bisimide core.