Carbon dots confined in 3D polymer network: Producing robust room temperature phosphorescence with tunable lifetimes

Room temperature phosphorescence(RTP) is important in both organic electronics and encryption. Despite rapid advances, a universal approach to robust and tunable RTP materials based on amorphous polymers remains a formidable challenge. Here, we present a strategy that uses three-dimensional(3 D)confinement of carbon dots in a polymer network to achieve ultra-long lifetime phosphorescence. The RTP of the as-obtained materials was not quenched in different polar organic solvents and the lifetime of the RTP was easily tuned by adjusting the amount of crosslinking or varying the drying temperature of the 3 D molecular network. As a demonstration of potential application, as-obtained RTP materials were successfully used to prepare RTP fibres for flexible textiles. As well as bringing to light a fundamental principle for the construction of polymer materials with RTP, we have endowed traditional carbon dots and polymers with fresh features that will expand potential applications.

Biopolymer Nanofibers for Nanogenerator Development

The development of nanogenerators(NGs)with optimal performances and functionalities requires more novel materials.Over the past decade,biopolymer nanofibers(BPNFs)have become critical sustainable building blocks in energy-related fields because they have distinctive nanostructures and properties and can be obtained from abundant and renewable resources.This review summarizes recent advances in the use of BPNFs for NG development.We will begin by introducing various strategies for fabricating BPNFs with diverse structures and performances.Then,we will systematically present the utilization of polysaccharide and protein nanofibers for NGs.We will mainly focus on the use of BPNFs to generate bulk materials with tailored structures and properties for assembling of triboelectric and piezoelectric NGs.The use of BPNFs to construct NGs for the generation of electricity from moisture and osmosis is also discussed.Finally,we illustrate our personal perspectives on several issues that require special attention with regard to future developments in this active field.

Total synthesis and stereochemistry establishmentof tumescenamide A

Tumescenamide A (1), isolated from Streptomyces tumescens YM23-20, consists of a cyclic depsipeptideand a side-chain 2,4-dimethylheptanoate (Dmh). Herein, we report the first total synthesis of tumescenamide A (1) and establish its stereochemistry. The configuration of Dmh is 2S,4S and, notably, the configuration of Val is revised as D. In addition, a mild and practical method for the β-elimination of derivatives ofserine and threonine by using nano-K_(2)CO_(3) as a base was established. A highly stereoselective synthesis ofthe Dmh substructure was also developed.