Multilayer 3D Chirality and Its Synthetic Assembly

3D chirality of sandwich type of organic molecules has been discovered.Te key element of this chirality is characterized by three layers of structures that are arranged nearly in parallel fashion with one on top and one down from the center plane.Individual enantiomers of these molecules have been fully characterized by spectroscopies with their enantiomeric purity measured by chiral HPLC.Te absolute confguration was unambiguously assigned by X-ray difraction analysis.Tis is the frst multilayer 3D chirality reported and is anticipated to lead to a new research area of asymmetric synthesis and catalysis and to have a broad impact on chemical,medicinal,and material sciences in future.

Multi-layer 3D chirality:new synthesis,AIE and computational studies

New synthesis of multi-layer 3 D chiral molecules has been developed under novel conditions to give better outcomes.The aggregation-induced emission(AIE),UV irradiation/excitation,charge transfer(CT)and local excited(LE)ππ*transitions have been investigated on a representative individual enantiomer of pseudo C_2 asymmetry which was made possibly by differentiating moieties on phosphorous on N-phosphonyl ring of chiral sandwich framework.Meanwhile,a new tandem C–N/C–C coupling reaction was unexpectedly rendered providing a novel access to special benzo[a]carbazoles.

Triple-Columned and Multiple-Layered 3D Polymers:Design,Synthesis,Aggregation-Induced Emission(AIE),and Computational Study

Conjugated polymers and oligomers have great potentials in various fields,especially in materials and biological sciences because of their intriguing electronic and optoelectronic properties.In recent years,the through-space conjugation system has emerged as a new assembled pattern of multidimensional polymers.Here,a novel series of structurally condensed multicolumn/multilayer 3D polymers and oligomers have been designed and synthesized through one-pot Suzuki polycondensation(SPC).The intramolecularly stacked arrangement of polymers can be supported by either X-ray structural analysis or computational analysis.In all cases,polymers were obtained with modest to good yields,as determined by GPC and 1 H-NMR.MALDI-TOF analysis has proven the speculation of the step-growth process of this polymerization.The computational study of ab initio and DFT calculations based on trimer and pentamer models gives details of the structures and the electronic transition.Experimental results of optical and AIE research confirmed by calculation indicates that the present work would facilitate the research and applications in materials.

Multilayer 3D Chiral Folding Polymers and Their Asymmetric Catalytic Assembly

A novel class of polymers and oligomers of chiral folding chirality has been designed and synthesized,showing structurally compacted triple.column/multiple layer frameworks.Both uniformed and diferentiated aromatic chromophoric units were successfully constructed between naphthy!piers of this framework.Screening monomers,catalysts,and catalytic systems led 1o the success of asymmetric catalytic Suzuki-Miyaura polycouplings Enantio-and diastereochemistry were unambiguously determined by X-ray structural analysis and concurrently by comparison with a similar asymmetric induction by the same catalyst in the asymmetric synthesis of a chiral three layered product.The resuling chiral polymers exhibit intense fluorescence activity in a solid form and solution under speci fic wavelength irradiation.

荷马权杖的象征意义新释

这篇文章考察了权杖在荷马时代的使用情况,以及它在史诗中何以充当了权威的显著象征这一问题。长久以来,人们所持的观点是,权杖被用作'演说棒',在演说者手中依次传递。与此观点相左,我们认为,事实上在荷马史诗中出现的每一个集会上,权杖都只被一人所持:此人恰恰是召开集会之人,而他所关心的议题将会在集会上被讲出。权杖不是神秘的法宝,而是朴素意义上的棍棒,是统治阶层对被统治者施以侮辱性惩罚的强力象征。