Browsing by Author "Yang, Zhen"
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Item Enantioselective assembly of multi-layer 3D chirality(2020) Wu, Guanzhao (TTU); Liu, Yangxue (TTU); Yang, Zhen; Jiang, Tao; Katakam, Nandakumar (TTU); Rouh, Hossein (TTU); Ma, Liulei (TTU); Tang, Yao (TTU); Ahmed, Sultan (TTU); Rahman, Anis U.; Huang, Hongen; Unruh, Daniel (TTU); Li, Guigen (TTU)The first enantioselective assembly of sandwich-shaped organo molecules has been achieved by conducting dual asymmetric Suzuki-Miyaura couplings and nine other reactions. This work also presents the first fully C-C anchored multi-layer 3D chirality with optically pure enantiomers. As confirmed by X-ray diffraction analysis that this chiral framework is featured by a unique C2-symmetry in which a nearly parallel fashion consisting of three layers: top, middle and bottom aromatic rings. Unlike the documented planar or axial chirality, the present chirality shows its top and bottom layers restrict each other from free rotation, i.e., this multi-layer 3D chirality would not exist if either top or bottom layer is removed. Nearly all multi-layered compounds showed strong luminescence of different colors under UV irradiation, and several randomly selected samples displayed aggregation-induced emission (AIE) properties. This work is believed to have broad impacts on chemical, medicinal and material sciences including optoelectronic materials in future.Item Triple-Columned and Multiple-Layered 3D Polymers: Design, Synthesis, Aggregation-Induced Emission (AIE), and Computational Study(2021) Wu, Guanzhao; Liu, Yangxue; Yang, Zhen; Ma, Liulei; Tang, Yao; Zhao, Xianliang; Rouh, Hossein; Zheng, Qixuan; Zhou, Peng; Wang, Jia-Yin; Siddique, Farhan; Zhang, Sai; Jin, Shengzhou; Unruh, Daniel; Aquino, Adelia J. A.; Lischka, Hans; Hutchins, Kristin M.; Li, GuigenConjugated 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 1H-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.