Highly Fluorescent Supramolecular Nanoring Composed of Bent‐Shaped Cyanostilbene Derivatives and Cucurbit[8]urils

Supramolecular organic frameworks (SOFs) made of organic guest molecule and cucurbit[8]uril (CB[8]) in aqueous solution have great potential for diverse applications. Herein, we designed highly fluorescent zero-dimensional (0D) nano-ring SOF with CB[8] as a host and novel bent-shaped cyanostilbene guest. This host-guest complex successfully formed macrocyclic...

2h

Regulating the Antifreeze Activity through Water: Latent Functions of Sugars of Antifreeze Glycoprotein Revealed by Using Total Chemical Synthesis

Antifreeze glycoprotein (AFGP), which inhibits the freezing of water, is highly O-glycosylated with a disaccharide, D-Galβ1-3-D-GalNAcα (GalGalNAc). To elucidate the function of the sugar residues for antifreeze activity at the molecular level, we conducted a total chemical synthesis of partially sugar deleted AFGP derivatives, and unnatural forms of AFGPs...

2h

Stabilization of 2D Imine‐Linked Covalent Organic Frameworks: From Linkage Chemistry to Interlayer Interaction

Stabilizing methodology: Emerging strategies, such as linkage transformation strategy, bond protection strategy, and interlayer interaction engineering, have recently been developed to regulate the stability of 2D imine-linked COFs. This provides a facile solution to the instability of imine-linked COFs while simultaneously conserving their structural...

2h

Dimerized Nitrogen‐Annulated Perylene Synthesized from 1,6‐Diazecine as Chiral Emitter

In this work, nitrogen-annulated perylene (NP) was dimerized into one framework connected by two nitrogen atoms, generating the target molecule of DNP-DA. Owing to the substructure of 1,6-diazecine ten-membered ring, DNP-DAillustrates helical chirality with moderate dissymmetry factor, elevated molecular levels, expanded conjugation and supramolecular...

2h

A Simple Four‐Step Synthesis of the Potato Alkaloid Demissidine from the Common Sapogenin Tigogenin

A simple synthesis method of solanidane alkaloids from common steroidal sapogenins was developed. Previously described multi-step transformations of tigogenin to demissidine (8‑12 steps) were shortened to four steps only. The key-step of the present synthesis was the epimerization at C25 of the lactam intermediate. Different approaches to this reaction,...

2h

Molecular Design of A−D−A Electron Acceptors Towards Low Energy Loss for Organic Solar Cells

Electron-vibration coupling is an important factor affecting the energy loss of organic solar cells. Enhancing molecular planarity and rigidity, adopting angular fusion mode, and tuning electron-deficient core can effectively decrease the electron-vibration couplings of A−D−A electron acceptors to achieve efficient charge generation and low energy loss...

2h

Enhanced Photocatalytic Activity of Hyper‐Cross‐Linked Polymers Toward Amines Oxidation Coupled with H2O2 Generation through Extending Monomer's Conjugation Degree

Extending the monomer's conjugation degree of HCPs photocatalysts could significantly promote the separation and transfer efficiency of photogenerated carriers. QP-HCPs bring out the best photocatalytic activity for amines oxidation coupled with H2O2 generation due to its maximum monomer's conjugation degree and excellent O2 adsorption capacity. ...

2h

The Chelate Effect Rationalizes Observed Rate Acceleration and Enantioselectivity in BINOL‐Catalyzed Petasis Reactions

1,1′-Bi-2-naphthol (BINOL) induces high enantiomeric excess of Petasis reaction by forming cyclic B(IV)BINOL intermediates. The chelate formation results in an extraordinary reaction rate acceleration and in the diminishment of the racemic background reaction. An unusual iminium C−H and O-BINOL hydrogen bond is responsible for the stereoselectivity....

2h

AAZTA‐like ligands bearing phenolate arms as efficient chelators for 68Ga labelling in vitro and in vivo

The introduction of a phenolate pendant arm in place of an acetate on AAZTA- and DATA-like ligands resulted in hepta- and hexadentate chelators able to form Ga(III) complexes with thermodynamic stability and kinetic inertness higher than that of other Ga(III) complexes based on the parent 6-amino-6-methylperhydro-1,4-diazepine scaffold. In particular,...

2h

In situ X‐ray Diffraction Studies on the Reduction of V2O5 and WO3 using Hydrogen

The reduction of metal oxides with hydrogen is widely used for the production of fine chemicals and metals both at laboratory and industry scale. In situ methods can help to elucidate reaction pathways and to gain control over such synthesis reactions. In this study, the reduction of WO3 and V2O5 with hydrogen has been investigated with in situ X-ray...

2h